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Diffstat (limited to 'gcc-4.2.1/libjava/classpath/vm/reference/java/lang/VMString.java')
| -rw-r--r-- | gcc-4.2.1/libjava/classpath/vm/reference/java/lang/VMString.java | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/gcc-4.2.1/libjava/classpath/vm/reference/java/lang/VMString.java b/gcc-4.2.1/libjava/classpath/vm/reference/java/lang/VMString.java deleted file mode 100644 index 7e65eed98..000000000 --- a/gcc-4.2.1/libjava/classpath/vm/reference/java/lang/VMString.java +++ /dev/null @@ -1,91 +0,0 @@ -/* VMString.java -- VM Specific String methods - Copyright (C) 2003 Free Software Foundation - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath is distributed in the hope that it will be useful, but -WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 USA. - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - -package java.lang; - -import java.lang.ref.WeakReference; -import java.util.WeakHashMap; - -/* - * This class is a reference version, mainly for compiling a class library - * jar. It is likely that VM implementers replace this with their own - * version that can communicate effectively with the VM. - */ - -/** - * Code relocated from java.lang.String by - * @author Dave Grove <groved@us.ibm.com> - */ -final class VMString -{ - - /** - * Holds the references for each intern()'d String. If all references to - * the string disappear, and the VM properly supports weak references, - * the String will be GC'd. - */ - private static final WeakHashMap internTable = new WeakHashMap(); - - /** - * Fetches this String from the intern hashtable. If two Strings are - * considered equal, by the equals() method, then intern() will return the - * same String instance. ie. if (s1.equals(s2)) then - * (s1.intern() == s2.intern()). All string literals and string-valued - * constant expressions are already interned. - * - * @param str the String to intern - * @return the interned String - */ - static String intern(String str) - { - synchronized (internTable) - { - WeakReference ref = (WeakReference) internTable.get(str); - if (ref != null) - { - String s = (String) ref.get(); - // If s is null, then no strong references exist to the String; - // the weak hash map will soon delete the key. - if (s != null) - return s; - } - internTable.put(str, new WeakReference(str)); - } - return str; - } - -} // class VMString |
