293 lines
9.9 KiB
Java
293 lines
9.9 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* $Header:$
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*/
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package org.apache.beehive.controls.api.properties;
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import java.io.IOException;
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import java.lang.annotation.Annotation;
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import java.lang.annotation.Inherited;
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import java.lang.reflect.AnnotatedElement;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import org.apache.beehive.controls.api.bean.ControlBean;
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import org.apache.beehive.controls.api.bean.ControlExtension;
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import org.apache.beehive.controls.api.bean.ControlInterface;
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/**
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* The AnnotatedElementMap represents a read-only PropertyMap where property values are
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* derived from Java 5.0 (JSR-175) annotations.
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*/
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public class AnnotatedElementMap
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extends BaseMap
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implements PropertyMap,java.io.Serializable
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{
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/**
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* Creates a new PropertyMap that is initialized based upon the type and annotations
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* associated with an AnnotatedElement.
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*/
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public AnnotatedElementMap(AnnotatedElement annotElem)
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{
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if (annotElem instanceof Class)
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setMapClass((Class)annotElem);
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else if (annotElem instanceof Field)
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setMapClass(((Field)annotElem).getType());
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else if (annotElem instanceof Method)
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{
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Class mapClass = getMethodMapClass((Method)annotElem);
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setMapClass(mapClass);
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}
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else
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throw new IllegalArgumentException("Unsupported element type: " + annotElem.getClass());
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_annotElem = annotElem;
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}
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// For methods, make sure we find a declaring class that is a valid
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// map class. For extended callback methods, we need to walk up a bit
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// further in the hierarchy.
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Class getMethodMapClass(Method method) {
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Class origMapClass = method.getDeclaringClass();
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Class mapClass = origMapClass;
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while (mapClass != null && !isValidMapClass(mapClass)) {
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mapClass = mapClass.getDeclaringClass();
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}
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if (mapClass == null) {
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mapClass = origMapClass;
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}
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return mapClass;
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}
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boolean isValidMapClass(Class mapClass) {
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if (ControlBean.class.isAssignableFrom(mapClass))
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{
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return true;
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}
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else
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{
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if (mapClass.isAnnotation() ||
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mapClass.isAnnotationPresent(ControlInterface.class) ||
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mapClass.isAnnotationPresent(ControlExtension.class)) {
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return true;
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}
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}
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return false;
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}
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/**
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* Sets the property specifed by 'key' within this map.
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*/
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public void setProperty(PropertyKey key, Object value)
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{
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throw new IllegalStateException("AnnotatedElementMap is a read-only PropertyMap");
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}
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/**
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* Returns the property value specified by 'key' within this map.
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*/
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public Object getProperty(PropertyKey key)
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{
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if (!isValidKey(key))
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throw new IllegalArgumentException("Key " + key + " is not valid for " + _mapClass);
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//
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// Look for the property value on the associated annotated element
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//
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Class propertySet = key.getPropertySet();
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Annotation annot = _annotElem.getAnnotation(propertySet);
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if (annot != null)
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return key.extractValue(annot);
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//
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// If the property supports inheritance and the annotated element is an interface,
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// then we'll search up the ControlInheritance/Extension hierachy to see if it is
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// provided higher up the chain.
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//
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if (propertySet.isAnnotationPresent(Inherited.class) && _annotElem instanceof Class)
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{
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Class controlIntf = (Class)_annotElem;
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do
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{
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Class [] superIntfs = controlIntf.getInterfaces();
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controlIntf = null;
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for (int i = 0; i < superIntfs.length; i++)
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{
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if (superIntfs[i].isAnnotationPresent(ControlInterface.class) ||
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superIntfs[i].isAnnotationPresent(ControlExtension.class))
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{
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controlIntf = superIntfs[i];
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annot = controlIntf.getAnnotation(propertySet);
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if (annot != null)
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return key.extractValue(annot);
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}
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}
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}
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while (controlIntf != null);
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}
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//
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// Call up to superclass for delegation / default value
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//
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return super.getProperty(key);
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}
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/**
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* Returns true if the PropertyMap contains one or more values for the specified
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* PropertySet, false otherwise
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*/
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public boolean containsPropertySet(Class<? extends Annotation> propertySet)
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{
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if (_annotElem.isAnnotationPresent(propertySet))
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return true;
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//
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// Call up to superclass for delegation
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//
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return super.containsPropertySet(propertySet);
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}
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/**
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* Returns the AnnotatedElement used for PropertyMap values.
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*/
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public AnnotatedElement getAnnotatedElement()
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{
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return _annotElem;
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}
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/**
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* Returns a String version of method argument lists based upon the method argument types
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*/
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private String getMethodArgs(Method m)
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{
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StringBuffer sb = new StringBuffer();
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Class [] argTypes = m.getParameterTypes();
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for (int i = 0; i < argTypes.length; i++)
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{
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if (i != 0) sb.append(",");
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sb.append(argTypes[i].toString());
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}
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return sb.toString();
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}
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/**
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* Overrides the standard Serialization writeObject method to compute and store the element
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* information in a serializable form.
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*/
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private void writeObject(java.io.ObjectOutputStream out) throws IOException
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{
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//
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// When serializing, compute sufficient information about the annotated element to
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// allow it to be reassociated later in readObject
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//
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if (_annotElem instanceof Class)
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{
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_elemClass = (Class)_annotElem;
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_elemDesc = null; // non required
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}
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else if (_annotElem instanceof Field)
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{
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Field f = (Field)_annotElem;
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_elemClass = f.getDeclaringClass();
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_elemDesc = f.getName();
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}
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else if (_annotElem instanceof Method)
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{
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Method m = (Method)_annotElem;
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_elemClass = m.getDeclaringClass();
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_elemDesc = m.getName() + "(" + getMethodArgs(m) + ")";
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}
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out.defaultWriteObject();
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}
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/**
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* Overrides the standard Serialization readObject implementation to reassociated with the
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* target AnnotatedElement after deserialization.
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*/
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private void readObject(java.io.ObjectInputStream in)
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throws IOException, ClassNotFoundException
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{
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in.defaultReadObject();
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if (_elemDesc == null) // element is a Class
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_annotElem = _elemClass;
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else
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{
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int argsIndex = _elemDesc.indexOf('(');
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if (argsIndex < 0) // element is a Field
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{
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try
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{
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_annotElem = _elemClass.getDeclaredField(_elemDesc);
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}
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catch (NoSuchFieldException nsfe)
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{
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throw new IOException("Unable to locate field " + nsfe);
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}
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}
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else // element is a method
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{
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String methodName = _elemDesc.substring(0, argsIndex);
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if (_elemDesc.charAt(argsIndex+1) == ')')
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{
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// At least handle the null args case quickly
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try
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{
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_annotElem = _elemClass.getDeclaredMethod(methodName, new Class [] {});
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}
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catch (NoSuchMethodException nsme)
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{
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throw new IOException("Unable to locate method " +_elemDesc);
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}
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}
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else
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{
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// Linear search for the rest :(
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String methodArgs = _elemDesc.substring(argsIndex+1, _elemDesc.length()-1);
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Method [] methods = _elemClass.getDeclaredMethods();
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for (int i = 0; i < methods.length; i++)
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{
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if (methods[i].getName().equals(methodName) &&
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getMethodArgs(methods[i]).equals(methodArgs))
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{
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_annotElem = methods[i];
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break;
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}
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}
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if (_annotElem == null)
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{
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throw new IOException("Unable to locate method " + _elemDesc);
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}
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}
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}
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}
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}
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// The AnnotatedElement upon which this PropertyMap is based. This is marked transient,
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// because many Reflection types are not Serializable.
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transient private AnnotatedElement _annotElem;
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private Class _elemClass; // Class associated with the annotated element
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private String _elemDesc; // Description of the element
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}
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