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From dblev...@apache.org
Subject svn commit: r155882 - geronimo/trunk/modules/kernel/src/java/org/apache/geronimo/gbean/ReferenceMap.java
Date Wed, 02 Mar 2005 05:50:42 GMT
Author: dblevins
Date: Tue Mar  1 21:50:40 2005
New Revision: 155882

URL: http://svn.apache.org/viewcvs?view=rev&rev=155882
Log:
Handy little implementation of map that indexes instances in a ReferenceCollection by a key
of your choosing.

Added:
    geronimo/trunk/modules/kernel/src/java/org/apache/geronimo/gbean/ReferenceMap.java

Added: geronimo/trunk/modules/kernel/src/java/org/apache/geronimo/gbean/ReferenceMap.java
URL: http://svn.apache.org/viewcvs/geronimo/trunk/modules/kernel/src/java/org/apache/geronimo/gbean/ReferenceMap.java?view=auto&rev=155882
==============================================================================
--- geronimo/trunk/modules/kernel/src/java/org/apache/geronimo/gbean/ReferenceMap.java (added)
+++ geronimo/trunk/modules/kernel/src/java/org/apache/geronimo/gbean/ReferenceMap.java Tue
Mar  1 21:50:40 2005
@@ -0,0 +1,123 @@
+/**
+ *
+ * Copyright 2003-2004 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.apache.geronimo.gbean;
+
+import java.util.*;
+
+public class ReferenceMap implements Map, ReferenceCollectionListener {
+    private final ReferenceCollection collection;
+    private final Map map;
+    private final Key key;
+
+    /**
+     * Constructs the ReferenceMap using a new instance of
+     * HashMap as the internal map.
+     *
+     * @param collection Must be an instance of ReferenceCollection
+     * @param map The map instance to which references will be added/removed
+     * @param key
+     */
+    public ReferenceMap(Collection collection, Map map, Key key) {
+        this.collection = (ReferenceCollection) collection;
+        this.map = map;
+        this.key = key;
+        for (Iterator iterator = this.collection.iterator(); iterator.hasNext();) {
+            Object object = iterator.next();
+            map.put(key.getKey(object), object);
+        }
+        this.collection.addReferenceCollectionListener(this);
+    }
+
+    /**
+     * Constructs the ReferenceMap using a new instance of
+     * HashMap as the internal map.
+     *
+     * @param collection Must be an instance of ReferenceCollection
+     * @param key
+     */
+    public ReferenceMap(Collection collection, Key key) {
+        this(collection, new HashMap(), key);
+    }
+
+    public void memberAdded(ReferenceCollectionEvent event) {
+        map.put(key.getKey(event.getMember()), event.getMember());
+    }
+
+    public void memberRemoved(ReferenceCollectionEvent event) {
+        map.remove(key.getKey(event.getMember()));
+    }
+
+    public interface Key {
+        public Object getKey(Object object);
+    }
+
+    public int size() {
+        return map.size();
+    }
+
+    public boolean isEmpty() {
+        return map.isEmpty();
+    }
+
+    public boolean containsKey(Object key) {
+        return map.containsKey(key);
+    }
+
+    public boolean containsValue(Object value) {
+        return map.containsValue(value);
+    }
+
+    public Object get(Object key) {
+        return map.get(key);
+    }
+
+    public Object put(Object key, Object value) {
+        return map.put(key, value);
+    }
+
+    public Object remove(Object key) {
+        return map.remove(key);
+    }
+
+    public void putAll(Map t) {
+        map.putAll(t);
+    }
+
+    public void clear() {
+        map.clear();
+    }
+
+    public Set keySet() {
+        return map.keySet();
+    }
+
+    public Collection values() {
+        return map.values();
+    }
+
+    public Set entrySet() {
+        return map.entrySet();
+    }
+
+    public boolean equals(Object o) {
+        return map.equals(o);
+    }
+
+    public int hashCode() {
+        return map.hashCode();
+    }
+}



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