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Change-Id: I49ce97136c17173c4ae3965c694af6e7bc49897d

1 files changed, 161 insertions, 0 deletions

diff --git a/src/org/jivesoftware/smack/util/collections/ReferenceMap.java b/src/org/jivesoftware/smack/util/collections/ReferenceMap.java
new file mode 100644
index 0000000..f30954d
--- /dev/null
+++ b/src/org/jivesoftware/smack/util/collections/ReferenceMap.java
@@ -0,0 +1,161 @@
+// GenericsNote: Converted.
+/*
+ *  Copyright 2002-2004 The Apache Software Foundation
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.jivesoftware.smack.util.collections;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+
+/**
+ * A <code>Map</code> implementation that allows mappings to be
+ * removed by the garbage collector.
+ * <p/>
+ * When you construct a <code>ReferenceMap</code>, you can specify what kind
+ * of references are used to store the map's keys and values.
+ * If non-hard references are used, then the garbage collector can remove
+ * mappings if a key or value becomes unreachable, or if the JVM's memory is
+ * running low. For information on how the different reference types behave,
+ * see {@link java.lang.ref.Reference}.
+ * <p/>
+ * Different types of references can be specified for keys and values.
+ * The keys can be configured to be weak but the values hard,
+ * in which case this class will behave like a
+ * <a href="http://java.sun.com/j2se/1.4/docs/api/java/util/WeakHashMap.html">
+ * <code>WeakHashMap</code></a>. However, you can also specify hard keys and
+ * weak values, or any other combination. The default constructor uses
+ * hard keys and soft values, providing a memory-sensitive cache.
+ * <p/>
+ * This map is similar to ReferenceIdentityMap.
+ * It differs in that keys and values in this class are compared using <code>equals()</code>.
+ * <p/>
+ * This {@link java.util.Map} implementation does <i>not</i> allow null elements.
+ * Attempting to add a null key or value to the map will raise a <code>NullPointerException</code>.
+ * <p/>
+ * This implementation is not synchronized.
+ * You can use {@link java.util.Collections#synchronizedMap} to
+ * provide synchronized access to a <code>ReferenceMap</code>.
+ * Remember that synchronization will not stop the garbage collecter removing entries.
+ * <p/>
+ * All the available iterators can be reset back to the start by casting to
+ * <code>ResettableIterator</code> and calling <code>reset()</code>.
+ * <p/>
+ * NOTE: As from Commons Collections 3.1 this map extends <code>AbstractReferenceMap</code>
+ * (previously it extended AbstractMap). As a result, the implementation is now
+ * extensible and provides a <code>MapIterator</code>.
+ *
+ * @author Paul Jack
+ * @author Matt Hall, John Watkinson, Stephen Colebourne
+ * @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:32 $
+ * @see java.lang.ref.Reference
+ * @since Commons Collections 3.0 (previously in main package v2.1)
+ */
+public class ReferenceMap <K,V> extends AbstractReferenceMap<K, V> implements Serializable {
+
+    /**
+     * Serialization version
+     */
+    private static final long serialVersionUID = 1555089888138299607L;
+
+    /**
+     * Constructs a new <code>ReferenceMap</code> that will
+     * use hard references to keys and soft references to values.
+     */
+    public ReferenceMap() {
+        super(HARD, SOFT, DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR, false);
+    }
+
+    /**
+     * Constructs a new <code>ReferenceMap</code> that will
+     * use the specified types of references.
+     *
+     * @param keyType   the type of reference to use for keys;
+     *                  must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
+     * @param valueType the type of reference to use for values;
+     *                  must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
+     */
+    public ReferenceMap(int keyType, int valueType) {
+        super(keyType, valueType, DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR, false);
+    }
+
+    /**
+     * Constructs a new <code>ReferenceMap</code> that will
+     * use the specified types of references.
+     *
+     * @param keyType     the type of reference to use for keys;
+     *                    must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
+     * @param valueType   the type of reference to use for values;
+     *                    must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
+     * @param purgeValues should the value be automatically purged when the
+     *                    key is garbage collected
+     */
+    public ReferenceMap(int keyType, int valueType, boolean purgeValues) {
+        super(keyType, valueType, DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR, purgeValues);
+    }
+
+    /**
+     * Constructs a new <code>ReferenceMap</code> with the
+     * specified reference types, load factor and initial
+     * capacity.
+     *
+     * @param keyType    the type of reference to use for keys;
+     *                   must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
+     * @param valueType  the type of reference to use for values;
+     *                   must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
+     * @param capacity   the initial capacity for the map
+     * @param loadFactor the load factor for the map
+     */
+    public ReferenceMap(int keyType, int valueType, int capacity, float loadFactor) {
+        super(keyType, valueType, capacity, loadFactor, false);
+    }
+
+    /**
+     * Constructs a new <code>ReferenceMap</code> with the
+     * specified reference types, load factor and initial
+     * capacity.
+     *
+     * @param keyType     the type of reference to use for keys;
+     *                    must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
+     * @param valueType   the type of reference to use for values;
+     *                    must be {@link #HARD}, {@link #SOFT}, {@link #WEAK}
+     * @param capacity    the initial capacity for the map
+     * @param loadFactor  the load factor for the map
+     * @param purgeValues should the value be automatically purged when the
+     *                    key is garbage collected
+     */
+    public ReferenceMap(int keyType, int valueType, int capacity, float loadFactor, boolean purgeValues) {
+        super(keyType, valueType, capacity, loadFactor, purgeValues);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Write the map out using a custom routine.
+     */
+    private void writeObject(ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        doWriteObject(out);
+    }
+
+    /**
+     * Read the map in using a custom routine.
+     */
+    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        doReadObject(in);
+    }
+
+}