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764 lines
28 KiB
Java
764 lines
28 KiB
Java
/* java.beans.EventSetDescriptor
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Copyright (C) 1998, 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.beans;
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import gnu.java.lang.ClassHelper;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.util.Vector;
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/**
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* EventSetDescriptor describes the hookup between an event source class and
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* an event listener class.
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*
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* <p>EventSets have several attributes: the listener class,
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* the events that can be fired to the listener (methods in the listener
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* class), and an add and remove listener method from the event firer's
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* class.
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* </p>
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*
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* <p>
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* The methods have these constraints on them:
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* <ul>
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* <li>event firing methods: must have <code>void</code> return value. Any
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* parameters and exceptions are allowed. May be public, protected or
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* package-protected. (Don't ask me why that is, I'm just following the spec.
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* The only place it is even mentioned is in the Java Beans white paper, and
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* there it is only implied.)</li>
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*
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* <li>add listener method: must have <code>void</code> return value. Must
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* take exactly one argument, of the listener class's type. May fire either
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* zero exceptions, or one exception of type
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* <code>java.util.TooManyListenersException</code>.
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* Must be public.</li>
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*
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* <li>remove listener method: must have <code>void</code> return value. Must
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* take exactly one argument, of the listener class's type. May not fire any
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* exceptions. Must be public.</li>
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* </ul>
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*
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* <p>
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* A final constraint is that event listener classes must extend from
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* EventListener.
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* </p>
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*
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* <p>
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* There are also various design patterns associated with some of the methods
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* of construction. Those are explained in more detail in the appropriate
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* constructors.
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* </p>
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*
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* <p>
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* <strong>Documentation Convention:</strong> for proper Internalization of
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* Beans inside an RAD tool, sometimes there are two names for a property or
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* method: a programmatic, or locale-independent name, which can be used
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* anywhere, and a localized, display name, for ease of use. In the
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* documentation I will specify different String values as either
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* <em>programmatic</em> or <em>localized</em> to make this distinction clear.
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*
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* @author John Keiser
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* @author Robert Schuster (robertschuster@fsfe.org)
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* @since 1.1
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*/
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public class EventSetDescriptor extends FeatureDescriptor
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{
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private Method addListenerMethod;
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private Method removeListenerMethod;
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private Class listenerType;
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private MethodDescriptor[] listenerMethodDescriptors;
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private Method[] listenerMethods;
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private Method getListenerMethod;
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private boolean unicast;
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private boolean inDefaultEventSet = true;
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/**
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* Creates a new <code>EventSetDescriptor</code<.
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*
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* <p>
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* This version of the constructor enforces the rules imposed on the methods
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* described at the top of this class, as well as searching for:
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* </p>
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*
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* <ol>
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* <li>
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* The event-firing method must be non-private with signature <code>void
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* <listenerMethodName>(<eventSetName>Event)</code> (where
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* <code><eventSetName></code> has its first character capitalized
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* by the constructor and the Event is a descendant of
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* {@link java.util.EventObject}) in class <code>listenerType</code>
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* (any exceptions may be thrown). <b>Implementation note:</b> Note that
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* there could conceivably be multiple methods with this type of signature
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* (example: <code>java.util.MouseEvent</code> vs.
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* <code>my.very.own.MouseEvent</code>). In this implementation, all
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* methods fitting the description will be put into the
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* <code>EventSetDescriptor</code>, even though the spec says only one
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* should be chosen (they probably weren't thinking as pathologically as I
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* was). I don't like arbitrarily choosing things. If your class has only one
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* such signature, as most do, you'll have no problems.</li>
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*
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* <li>The add and remove methods must be public and named <code>void
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* add<eventSetName>Listener(<listenerType>)</code> and
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* <code>void remove<eventSetName>Listener(<listenerType>)</code>
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* in in class <code>eventSourceClass</code>, where
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* <code><eventSetName></code> will have its first letter capitalized.
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* Standard exception rules (see class description) apply.</li>
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* </ol>
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*
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* @param eventSourceClass
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* the class containing the add/remove listener methods.
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* @param eventSetName
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* the programmatic name of the event set, generally starting with a
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* lowercase letter (i.e. fooManChu instead of FooManChu). This will
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* be used to generate the name of the event object as well as the
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* names of the add and remove methods.
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* @param listenerType
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* the class containing the event firing method.
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* @param listenerMethodName
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* the name of the event firing method.
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* @exception IntrospectionException
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* if listenerType is not an EventListener, or if methods are not
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* found or are invalid.
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*/
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public EventSetDescriptor(Class eventSourceClass, String eventSetName,
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Class listenerType, String listenerMethodName)
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throws IntrospectionException
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{
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setName(eventSetName);
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if (!java.util.EventListener.class.isAssignableFrom(listenerType))
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{
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throw new IntrospectionException(
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"Listener type is not an EventListener.");
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}
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String[] names = new String[1];
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names[0] = listenerMethodName;
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try
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{
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eventSetName = Character.toUpperCase(eventSetName.charAt(0))
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+ eventSetName.substring(1);
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}
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catch (StringIndexOutOfBoundsException e)
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{
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eventSetName = "";
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}
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findMethods(eventSourceClass, listenerType, names,
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"add" + eventSetName + "Listener",
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"remove" + eventSetName + "Listener", eventSetName + "Event");
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this.listenerType = listenerType;
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checkAddListenerUnicast();
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if (this.removeListenerMethod.getExceptionTypes().length > 0)
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{
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throw new IntrospectionException(
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"Listener remove method throws exceptions.");
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}
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}
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/**
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* Creates a new <code>EventSetDescriptor</code>.
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*
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* <p>This form of the constructor allows you to specify the names of the
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* methods and adds no new constraints on top of the rules already described
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* at the top of the class.
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* </p>
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*
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* @param eventSourceClass
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* the class containing the add and remove listener methods.
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* @param eventSetName
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* the programmatic name of the event set, generally starting with a
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* lowercase letter (i.e. fooManChu instead of FooManChu).
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* @param listenerType
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* the class containing the event firing methods.
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* @param listenerMethodNames
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* the names of the even firing methods.
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* @param addListenerMethodName
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* the name of the add listener method.
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* @param removeListenerMethodName
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* the name of the remove listener method.
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* @exception IntrospectionException
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* if listenerType is not an EventListener or if methods are not
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* found or are invalid.
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*/
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public EventSetDescriptor(Class eventSourceClass, String eventSetName,
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Class listenerType, String[] listenerMethodNames,
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String addListenerMethodName,
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String removeListenerMethodName)
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throws IntrospectionException
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{
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setName(eventSetName);
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if (!java.util.EventListener.class.isAssignableFrom(listenerType))
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{
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throw new IntrospectionException(
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"Listener type is not an EventListener.");
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}
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findMethods(eventSourceClass, listenerType, listenerMethodNames,
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addListenerMethodName, removeListenerMethodName, null);
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this.listenerType = listenerType;
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checkAddListenerUnicast();
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if (this.removeListenerMethod.getExceptionTypes().length > 0)
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{
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throw new IntrospectionException(
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"Listener remove method throws exceptions.");
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}
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}
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/**
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* Creates a new <code>EventSetDescriptor</code>.
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*
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* <p>
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* This variant of the constructor allows you to specify the names of the
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* methods and adds no new constraints on top of the rules already described
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* at the top of the class.
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* </p>
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* <p>
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* A valid GetListener method is public, flags no exceptions and has one
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* argument which is of type <code>Class</code>
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* {@link java.awt.Component#getListeners(Class)} is such a method.
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* </p>
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* <p>
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* Note: The validity of the return value of the GetListener method is not
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* checked.
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* </p>
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*
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* @param eventSourceClass
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* the class containing the add and remove listener methods.
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* @param eventSetName
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* the programmatic name of the event set, generally starting with a
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* lowercase letter (i.e. fooManChu instead of FooManChu).
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* @param listenerType
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* the class containing the event firing methods.
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* @param listenerMethodNames
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* the names of the even firing methods.
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* @param addListenerMethodName
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* the name of the add listener method.
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* @param removeListenerMethodName
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* the name of the remove listener method.
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* @param getListenerMethodName
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* Name of a method which returns the array of listeners.
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* @exception IntrospectionException
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* if listenerType is not an EventListener or if methods are not
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* found or are invalid.
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* @since 1.4
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*/
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public EventSetDescriptor(Class eventSourceClass, String eventSetName,
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Class listenerType, String[] listenerMethodNames,
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String addListenerMethodName,
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String removeListenerMethodName,
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String getListenerMethodName)
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throws IntrospectionException
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{
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this(eventSourceClass, eventSetName, listenerType, listenerMethodNames,
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addListenerMethodName, removeListenerMethodName);
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Method newGetListenerMethod = null;
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try
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{
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newGetListenerMethod
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= eventSourceClass.getMethod(getListenerMethodName,
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new Class[] { Class.class });
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}
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catch (NoSuchMethodException nsme)
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{
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throw (IntrospectionException)
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new IntrospectionException("No method named " + getListenerMethodName
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+ " in class " + listenerType
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+ " which can be used as"
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+ " getListenerMethod.").initCause(nsme);
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}
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// Note: This does not check the return value (which
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// should be EventListener[]) but the JDK does not either.
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getListenerMethod = newGetListenerMethod;
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}
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/**
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* Creates a new <code>EventSetDescriptor.</code>
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*
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* <p>
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* This variant of the constructor allows you to specify the names of the
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* methods and adds no new constraints on top of the rules already described
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* at the top of the class.
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* </p>
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* <p>
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* A valid GetListener method is public, flags no exceptions and has one
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* argument which is of type <code>Class</code>
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* {@link java.awt.Component#getListeners(Class)} is such a method.
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* </p>
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* <p>
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* Note: The validity of the return value of the GetListener method is not
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* checked.
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* </p>
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*
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* @param eventSetName
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* the programmatic name of the event set, generally starting with a
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* lowercase letter (i.e. fooManChu instead of FooManChu).
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* @param listenerType
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* the class containing the listenerMethods.
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* @param listenerMethods
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* the event firing methods.
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* @param addListenerMethod
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* the add listener method.
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* @param removeListenerMethod
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* the remove listener method.
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* @param getListenerMethod
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* The method which returns an array of the listeners.
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* @exception IntrospectionException
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* if the listenerType is not an EventListener, or any of the
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* methods are invalid.
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* @since 1.4
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*/
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public EventSetDescriptor(String eventSetName, Class listenerType,
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Method[] listenerMethods, Method addListenerMethod,
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Method removeListenerMethod,
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Method getListenerMethod)
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throws IntrospectionException
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{
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this(eventSetName, listenerType, listenerMethods, addListenerMethod,
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removeListenerMethod);
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// Do no checks if the getListenerMethod is null.
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if (getListenerMethod.getParameterTypes().length != 1
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|| getListenerMethod.getParameterTypes()[0] != Class.class
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|| getListenerMethod.getExceptionTypes().length > 0
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|| !Modifier.isPublic(getListenerMethod.getModifiers()))
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throw new IntrospectionException("GetListener method is invalid.");
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// Note: This does not check the return value (which
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// should be EventListener[]) but the JDK does not either.
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this.getListenerMethod = getListenerMethod;
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}
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/**
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* Creates a new <code>EventSetDescriptor</code>.
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*
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* <p>This form of constructor allows you to explicitly say which methods
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* do what, and no reflection is done by the <code>EventSetDescriptor</code>.
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* The methods are, however, checked to ensure that they follow the rules
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* set forth at the top of the class.
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*
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* @param eventSetName
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* the programmatic name of the event set, generally starting with a
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* lowercase letter (i.e. fooManChu instead of FooManChu).
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* @param listenerType
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* the class containing the listenerMethods.
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* @param listenerMethods
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* the event firing methods.
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* @param addListenerMethod
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* the add listener method.
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* @param removeListenerMethod
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* the remove listener method.
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* @exception IntrospectionException
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* if the listenerType is not an EventListener, or any of the
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* methods are invalid.
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*/
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public EventSetDescriptor(String eventSetName, Class listenerType,
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Method[] listenerMethods, Method addListenerMethod,
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Method removeListenerMethod)
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throws IntrospectionException
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{
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setName(eventSetName);
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if (!java.util.EventListener.class.isAssignableFrom(listenerType))
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{
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throw new IntrospectionException(
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"Listener type is not an EventListener.");
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}
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this.listenerMethods = listenerMethods;
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this.addListenerMethod = addListenerMethod;
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this.removeListenerMethod = removeListenerMethod;
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this.listenerType = listenerType;
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checkMethods();
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checkAddListenerUnicast();
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if (this.removeListenerMethod.getExceptionTypes().length > 0)
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{
|
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throw new IntrospectionException(
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"Listener remove method throws exceptions.");
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}
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}
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|
|
/** Creates a new <code>EventSetDescriptor</code>.
|
|
*
|
|
* <p>This form of constructor allows you to explicitly say which methods do
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|
* what, and no reflection is done by the <code>EventSetDescriptor</code>.
|
|
* The methods are, however, checked to ensure that they follow the rules
|
|
* set forth at the top of the class.
|
|
*
|
|
* @param eventSetName
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|
* the programmatic name of the event set, generally starting with a
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* lowercase letter (i.e. fooManChu instead of FooManChu).
|
|
* @param listenerType
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* the class containing the listenerMethods.
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|
* @param listenerMethodDescriptors
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* the event firing methods.
|
|
* @param addListenerMethod
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* the add listener method.
|
|
* @param removeListenerMethod
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* the remove listener method.
|
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* @exception IntrospectionException
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* if the listenerType is not an EventListener, or any of the
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* methods are invalid.
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|
*/
|
|
public EventSetDescriptor(String eventSetName, Class listenerType,
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MethodDescriptor[] listenerMethodDescriptors,
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Method addListenerMethod,
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Method removeListenerMethod)
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throws IntrospectionException
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|
{
|
|
setName(eventSetName);
|
|
if (!java.util.EventListener.class.isAssignableFrom(listenerType))
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|
{
|
|
throw new IntrospectionException(
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"Listener type is not an EventListener.");
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}
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this.listenerMethodDescriptors = listenerMethodDescriptors;
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this.listenerMethods = new Method[listenerMethodDescriptors.length];
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for (int i = 0; i < this.listenerMethodDescriptors.length; i++)
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{
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|
this.listenerMethods[i]
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= this.listenerMethodDescriptors[i].getMethod();
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}
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this.addListenerMethod = addListenerMethod;
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this.removeListenerMethod = removeListenerMethod;
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this.listenerType = listenerType;
|
|
checkMethods();
|
|
checkAddListenerUnicast();
|
|
if (this.removeListenerMethod.getExceptionTypes().length > 0)
|
|
{
|
|
throw new IntrospectionException(
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|
"Listener remove method throws exceptions.");
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}
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|
}
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|
|
/** Returns the class that contains the event firing methods.
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*/
|
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public Class getListenerType()
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{
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return listenerType;
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}
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|
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/** Returns the event firing methods.
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*/
|
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public Method[] getListenerMethods()
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{
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return listenerMethods;
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}
|
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|
|
/** Returns the event firing methods as {@link MethodDescriptor}.
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|
*/
|
|
public MethodDescriptor[] getListenerMethodDescriptors()
|
|
{
|
|
if (listenerMethodDescriptors == null)
|
|
{
|
|
listenerMethodDescriptors
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= new MethodDescriptor[listenerMethods.length];
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|
|
|
for (int i = 0; i < listenerMethods.length; i++)
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{
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listenerMethodDescriptors[i]
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= new MethodDescriptor(listenerMethods[i]);
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}
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|
}
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return listenerMethodDescriptors;
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}
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|
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/** Returns the add listener method.
|
|
*/
|
|
public Method getAddListenerMethod()
|
|
{
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return addListenerMethod;
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|
}
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|
|
|
/* Returns the remove listener method.
|
|
*/
|
|
public Method getRemoveListenerMethod()
|
|
{
|
|
return removeListenerMethod;
|
|
}
|
|
|
|
/**
|
|
* Returns the method that retrieves the listeners or <code>null</code> if
|
|
* it does not exist.
|
|
*/
|
|
public Method getGetListenerMethod()
|
|
{
|
|
return getListenerMethod;
|
|
}
|
|
|
|
/** Sets whether or not multiple listeners may be added.
|
|
*
|
|
* @param unicast
|
|
* whether or not multiple listeners may be added.
|
|
*/
|
|
public void setUnicast(boolean unicast)
|
|
{
|
|
this.unicast = unicast;
|
|
}
|
|
|
|
/** Returns whether or not multiple listeners may be added.
|
|
* (Defaults to false.)
|
|
*/
|
|
public boolean isUnicast()
|
|
{
|
|
return unicast;
|
|
}
|
|
|
|
/** Sets whether or not this is in the default event set.
|
|
*
|
|
* @param inDefaultEventSet
|
|
* whether this is in the default event set.
|
|
*/
|
|
public void setInDefaultEventSet(boolean inDefaultEventSet)
|
|
{
|
|
this.inDefaultEventSet = inDefaultEventSet;
|
|
}
|
|
|
|
/** Returns whether or not this is in the default event set.
|
|
* (Defaults to true.)
|
|
*/
|
|
public boolean isInDefaultEventSet()
|
|
{
|
|
return inDefaultEventSet;
|
|
}
|
|
|
|
private void checkAddListenerUnicast() throws IntrospectionException
|
|
{
|
|
Class[] addListenerExceptions = this.addListenerMethod.getExceptionTypes();
|
|
if (addListenerExceptions.length > 1)
|
|
{
|
|
throw new IntrospectionException(
|
|
"Listener add method throws too many exceptions.");
|
|
}
|
|
else if (addListenerExceptions.length == 1
|
|
&& !java.util.TooManyListenersException.class
|
|
.isAssignableFrom(addListenerExceptions[0]))
|
|
{
|
|
throw new IntrospectionException(
|
|
"Listener add method throws too many exceptions.");
|
|
}
|
|
}
|
|
|
|
private void checkMethods() throws IntrospectionException
|
|
{
|
|
if (!addListenerMethod.getDeclaringClass()
|
|
.isAssignableFrom(removeListenerMethod.getDeclaringClass())
|
|
&& !removeListenerMethod.getDeclaringClass()
|
|
.isAssignableFrom(addListenerMethod.getDeclaringClass()))
|
|
{
|
|
throw new IntrospectionException(
|
|
"add and remove listener methods do not come from the"
|
|
+ " same class. This is bad.");
|
|
}
|
|
if (!addListenerMethod.getReturnType().equals(java.lang.Void.TYPE)
|
|
|| addListenerMethod.getParameterTypes().length != 1
|
|
|| !listenerType.equals(addListenerMethod.getParameterTypes()[0])
|
|
|| !Modifier.isPublic(addListenerMethod.getModifiers()))
|
|
{
|
|
throw new IntrospectionException("Add Listener Method invalid.");
|
|
}
|
|
if (!removeListenerMethod.getReturnType().equals(java.lang.Void.TYPE)
|
|
|| removeListenerMethod.getParameterTypes().length != 1
|
|
|| !listenerType.equals(removeListenerMethod.getParameterTypes()[0])
|
|
|| removeListenerMethod.getExceptionTypes().length > 0
|
|
|| !Modifier.isPublic(removeListenerMethod.getModifiers()))
|
|
{
|
|
throw new IntrospectionException("Remove Listener Method invalid.");
|
|
}
|
|
|
|
for (int i = 0; i < listenerMethods.length; i++)
|
|
{
|
|
if (!listenerMethods[i].getReturnType().equals(java.lang.Void.TYPE)
|
|
|| Modifier.isPrivate(listenerMethods[i].getModifiers()))
|
|
{
|
|
throw new IntrospectionException("Event Method "
|
|
+ listenerMethods[i].getName()
|
|
+ " non-void or private.");
|
|
}
|
|
if (!listenerMethods[i].getDeclaringClass()
|
|
.isAssignableFrom(listenerType))
|
|
{
|
|
throw new IntrospectionException("Event Method "
|
|
+ listenerMethods[i].getName()
|
|
+ " not from class "
|
|
+ listenerType.getName());
|
|
}
|
|
}
|
|
}
|
|
|
|
private void findMethods(Class eventSourceClass, Class listenerType,
|
|
String listenerMethodNames[],
|
|
String addListenerMethodName,
|
|
String removeListenerMethodName,
|
|
String absurdEventClassCheckName)
|
|
throws IntrospectionException
|
|
{
|
|
|
|
/* Find add listener method and remove listener method. */
|
|
Class[] listenerArgList = new Class[1];
|
|
listenerArgList[0] = listenerType;
|
|
try
|
|
{
|
|
this.addListenerMethod
|
|
= eventSourceClass.getMethod(addListenerMethodName,
|
|
listenerArgList);
|
|
}
|
|
catch (SecurityException E)
|
|
{
|
|
throw new IntrospectionException(
|
|
"SecurityException trying to access method "
|
|
+ addListenerMethodName + ".");
|
|
}
|
|
catch (NoSuchMethodException E)
|
|
{
|
|
throw new IntrospectionException("Could not find method "
|
|
+ addListenerMethodName + ".");
|
|
}
|
|
|
|
if (this.addListenerMethod == null
|
|
|| !this.addListenerMethod.getReturnType().equals(java.lang.Void.TYPE))
|
|
{
|
|
throw new IntrospectionException(
|
|
"Add listener method does not exist, is not public,"
|
|
+ " or is not void.");
|
|
}
|
|
|
|
try
|
|
{
|
|
this.removeListenerMethod
|
|
= eventSourceClass.getMethod(removeListenerMethodName,
|
|
listenerArgList);
|
|
}
|
|
catch (SecurityException E)
|
|
{
|
|
throw new IntrospectionException(
|
|
"SecurityException trying to access method "
|
|
+ removeListenerMethodName + ".");
|
|
}
|
|
catch (NoSuchMethodException E)
|
|
{
|
|
throw new IntrospectionException("Could not find method "
|
|
+ removeListenerMethodName + ".");
|
|
}
|
|
if (this.removeListenerMethod == null
|
|
|| !this.removeListenerMethod.getReturnType()
|
|
.equals(java.lang.Void.TYPE))
|
|
{
|
|
throw new IntrospectionException(
|
|
"Remove listener method does not exist, is not public,"
|
|
+ " or is not void.");
|
|
}
|
|
|
|
/* Find the listener methods. */
|
|
Method[] methods;
|
|
try
|
|
{
|
|
methods = ClassHelper.getAllMethods(listenerType);
|
|
}
|
|
catch (SecurityException E)
|
|
{
|
|
throw new IntrospectionException(
|
|
"Security: You cannot access fields in this class.");
|
|
}
|
|
|
|
Vector chosenMethods = new Vector();
|
|
boolean[] listenerMethodFound = new boolean[listenerMethodNames.length];
|
|
for (int i = 0; i < methods.length; i++)
|
|
{
|
|
if (Modifier.isPrivate(methods[i].getModifiers()))
|
|
{
|
|
continue;
|
|
}
|
|
Method currentMethod = methods[i];
|
|
Class retval = currentMethod.getReturnType();
|
|
if (retval.equals(java.lang.Void.TYPE))
|
|
{
|
|
for (int j = 0; j < listenerMethodNames.length; j++)
|
|
{
|
|
if (currentMethod.getName().equals(listenerMethodNames[j])
|
|
&& (absurdEventClassCheckName == null
|
|
|| (currentMethod.getParameterTypes().length == 1
|
|
&& ((currentMethod.getParameterTypes()[0])
|
|
.getName().equals(absurdEventClassCheckName)
|
|
|| (currentMethod.getParameterTypes()[0])
|
|
.getName().endsWith("." + absurdEventClassCheckName)))))
|
|
{
|
|
chosenMethods.addElement(currentMethod);
|
|
listenerMethodFound[j] = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Make sure we found all the methods we were looking for. */
|
|
for (int i = 0; i < listenerMethodFound.length; i++)
|
|
{
|
|
if (!listenerMethodFound[i])
|
|
{
|
|
throw new IntrospectionException("Could not find event method "
|
|
+ listenerMethodNames[i]);
|
|
}
|
|
}
|
|
|
|
/* Now that we've chosen the listener methods we want, store them. */
|
|
this.listenerMethods = new Method[chosenMethods.size()];
|
|
for (int i = 0; i < chosenMethods.size(); i++)
|
|
{
|
|
this.listenerMethods[i] = (Method) chosenMethods.elementAt(i);
|
|
}
|
|
}
|
|
|
|
}
|