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88 lines
2.8 KiB
Java
88 lines
2.8 KiB
Java
/*
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* @(#) $(JCGO)/goclsp/vm/java/lang/VMString.java --
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* VM specific methods for Java "String" class.
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**
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* Project: JCGO (http://www.ivmaisoft.com/jcgo/)
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* Copyright (C) 2001-2008 Ivan Maidanski <ivmai@ivmaisoft.com>
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* All rights reserved.
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**
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* Class specification origin: GNU Classpath v0.93 vm/reference
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*/
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/*
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* This 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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**
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* This software 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 (GPL) for more details.
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**
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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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**
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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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*/
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package java.lang;
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import java.lang.ref.WeakReference;
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import java.util.HashMap;
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import java.util.WeakHashMap;
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final class VMString /* hard-coded class name */
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{
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private static WeakHashMap internTable;
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private static HashMap internLiteralTable;
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private VMString() {}
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static synchronized String intern(String str)
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{
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WeakHashMap table;
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if ((table = internTable) == null)
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{
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String[] literals = getInitStrings0();
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int len = literals != null ? literals.length : 0;
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HashMap table2 = new HashMap(len / 3 + len + 1);
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for (int i = 0; i < len; i++)
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{
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String s = literals[i];
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if (s != null)
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table2.put(s, s);
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}
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internLiteralTable = table2;
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table = new WeakHashMap();
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internTable = table;
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}
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Object obj = table.get(str);
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if ((obj = obj != null ? ((WeakReference) obj).get() :
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internLiteralTable.get(str)) != null)
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return (String) obj;
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if (str == null) /* hack */
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throw new InternalError();
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table.put(str, new WeakReference(str));
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return str;
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}
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private static native
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String[] getInitStrings0(); /* JVM-core */ /* const data */
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}
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