Makefile.am: Add HashSet.java and java/lang/ref classes.

	* Makefile.am: Add HashSet.java and java/lang/ref classes.
	Remove BasicMapEntry.java and Bucket.java.
	* Makefile.in: Rebuilt.
	* java/util/HashMap.java: Rewritten.
	* java/util/HashSet.java: Imported from classpath.
	* java/util/WeakHashMap.java: Imported from classpath.
	* java/util/Hashtable.java: Rewritten based on new HashMap code.
	* java/util/Bucket.java: Deleted.
	* java/util/BasicMapEntry.java: Deleted.
	* java/util/Collections.java (search): Use a for-loop, not iterator
	hasNext().
	(copy): Use a for-loop. Throw an IndexOutOfBoundsException if run out
	of elements in source.
	(max): Use a for-loop.
	(min): Ditto.
	(reverse): Keep track of positions instead of using Iterator's
	nextIndex() and previousIndex().
	(shuffle(List)): Initialize defaultRandom if required using
	double-check thread safety idiom. Call two-argument shuffle method
	using defaultRandom.
	(defaultRandom): New field.
	(shuffle(List, Random)): Use a for-loop. Keep track of pos instead
	of using previousIndex() and nextIndex().
	(singletonMap(iterator)): Use a HashMap.Entry, not BasicMapEntry.
	* java/util/AbstractCollection.java (toString): Use a StringBuffer.
	* java/util/AbstractMap.java (toString): Use StringBuffer.
	* java/lang/ref/PhantomReference.java: Imported from classpath.
	* java/lang/ref/SoftReference.java: Ditto.
	* java/lang/ref/Reference.java: Ditto.
	* java/lang/ref/WeakReference.java: Ditto.
	* java/lang/ref/ReferenceQueue.java: Ditto.

From-SVN: r38183

1 files changed, 62 insertions, 0 deletions

diff --git a/libjava/java/lang/ref/PhantomReference.java b/libjava/java/lang/ref/PhantomReference.java
new file mode 100644
index 0000000..7c07b52e
--- /dev/null
+++ b/libjava/java/lang/ref/PhantomReference.java
@@ -0,0 +1,62 @@
+/* java.lang.ref.PhantomReference
+   Copyright (C) 1999 Free Software Foundation, Inc.
+
+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., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
+
+
+package java.lang.ref;
+
+/**
+ * A phantom reference is useful, to get notified, when an object got
+ * finalized.  You can't access that object though, since it is
+ * finalized.  This is the reason, why <code>get()</code> always
+ * returns null.
+ *
+ * @author Jochen Hoenicke 
+ */
+public class PhantomReference 
+  extends Reference
+{
+  /**
+   * Creates a new phantom reference.
+   * @param referent the object that should be watched.
+   * @param q the queue that should be notified, if the referent was
+   * finalized.  This mustn't be <code>null</code>.
+   * @exception NullPointerException if q is null.
+   */
+  public PhantomReference(Object referent, ReferenceQueue q)
+  {
+    super(referent, q);
+  }
+  
+  /**
+   * Returns the object, this reference refers to.
+   * @return <code>null</code>, since the refered object may be
+   * finalized and thus not accessible.  
+   */
+  public Object get()
+  {
+    return null;
+  }
+}