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1 files changed, 134 insertions, 0 deletions

diff --git a/libjava/classpath/external/jsr166/java/util/concurrent/ConcurrentMap.java b/libjava/classpath/external/jsr166/java/util/concurrent/ConcurrentMap.java
new file mode 100644
index 000000000..6e5bd0738
--- /dev/null
+++ b/libjava/classpath/external/jsr166/java/util/concurrent/ConcurrentMap.java
@@ -0,0 +1,134 @@
+/*
+ * Written by Doug Lea with assistance from members of JCP JSR-166
+ * Expert Group and released to the public domain, as explained at
+ * http://creativecommons.org/licenses/publicdomain
+ */
+
+package java.util.concurrent;
+import java.util.Map;
+
+/**
+ * A {@link java.util.Map} providing additional atomic
+ * <tt>putIfAbsent</tt>, <tt>remove</tt>, and <tt>replace</tt> methods.
+ *
+ * <p>Memory consistency effects: As with other concurrent
+ * collections, actions in a thread prior to placing an object into a
+ * {@code ConcurrentMap} as a key or value
+ * <a href="package-summary.html#MemoryVisibility"><i>happen-before</i></a>
+ * actions subsequent to the access or removal of that object from
+ * the {@code ConcurrentMap} in another thread.
+ *
+ * <p>This interface is a member of the
+ * <a href="{@docRoot}/../technotes/guides/collections/index.html">
+ * Java Collections Framework</a>.
+ *
+ * @since 1.5
+ * @author Doug Lea
+ * @param <K> the type of keys maintained by this map
+ * @param <V> the type of mapped values
+ */
+public interface ConcurrentMap<K, V> extends Map<K, V> {
+    /**
+     * If the specified key is not already associated
+     * with a value, associate it with the given value.
+     * This is equivalent to
+     * <pre>
+     *   if (!map.containsKey(key))
+     *       return map.put(key, value);
+     *   else
+     *       return map.get(key);</pre>
+     * except that the action is performed atomically.
+     *
+     * @param key key with which the specified value is to be associated
+     * @param value value to be associated with the specified key
+     * @return the previous value associated with the specified key, or
+     *         <tt>null</tt> if there was no mapping for the key.
+     *         (A <tt>null</tt> return can also indicate that the map
+     *         previously associated <tt>null</tt> with the key,
+     *         if the implementation supports null values.)
+     * @throws UnsupportedOperationException if the <tt>put</tt> operation
+     *         is not supported by this map
+     * @throws ClassCastException if the class of the specified key or value
+     *         prevents it from being stored in this map
+     * @throws NullPointerException if the specified key or value is null,
+     *         and this map does not permit null keys or values
+     * @throws IllegalArgumentException if some property of the specified key
+     *         or value prevents it from being stored in this map
+     *
+     */
+    V putIfAbsent(K key, V value);
+
+    /**
+     * Removes the entry for a key only if currently mapped to a given value.
+     * This is equivalent to
+     * <pre>
+     *   if (map.containsKey(key) &amp;&amp; map.get(key).equals(value)) {
+     *       map.remove(key);
+     *       return true;
+     *   } else return false;</pre>
+     * except that the action is performed atomically.
+     *
+     * @param key key with which the specified value is associated
+     * @param value value expected to be associated with the specified key
+     * @return <tt>true</tt> if the value was removed
+     * @throws UnsupportedOperationException if the <tt>remove</tt> operation
+     *         is not supported by this map
+     * @throws ClassCastException if the key or value is of an inappropriate
+     *         type for this map (optional)
+     * @throws NullPointerException if the specified key or value is null,
+     *         and this map does not permit null keys or values (optional)
+     */
+    boolean remove(Object key, Object value);
+
+    /**
+     * Replaces the entry for a key only if currently mapped to a given value.
+     * This is equivalent to
+     * <pre>
+     *   if (map.containsKey(key) &amp;&amp; map.get(key).equals(oldValue)) {
+     *       map.put(key, newValue);
+     *       return true;
+     *   } else return false;</pre>
+     * except that the action is performed atomically.
+     *
+     * @param key key with which the specified value is associated
+     * @param oldValue value expected to be associated with the specified key
+     * @param newValue value to be associated with the specified key
+     * @return <tt>true</tt> if the value was replaced
+     * @throws UnsupportedOperationException if the <tt>put</tt> operation
+     *         is not supported by this map
+     * @throws ClassCastException if the class of a specified key or value
+     *         prevents it from being stored in this map
+     * @throws NullPointerException if a specified key or value is null,
+     *         and this map does not permit null keys or values
+     * @throws IllegalArgumentException if some property of a specified key
+     *         or value prevents it from being stored in this map
+     */
+    boolean replace(K key, V oldValue, V newValue);
+
+    /**
+     * Replaces the entry for a key only if currently mapped to some value.
+     * This is equivalent to
+     * <pre>
+     *   if (map.containsKey(key)) {
+     *       return map.put(key, value);
+     *   } else return null;</pre>
+     * except that the action is performed atomically.
+     *
+     * @param key key with which the specified value is associated
+     * @param value value to be associated with the specified key
+     * @return the previous value associated with the specified key, or
+     *         <tt>null</tt> if there was no mapping for the key.
+     *         (A <tt>null</tt> return can also indicate that the map
+     *         previously associated <tt>null</tt> with the key,
+     *         if the implementation supports null values.)
+     * @throws UnsupportedOperationException if the <tt>put</tt> operation
+     *         is not supported by this map
+     * @throws ClassCastException if the class of the specified key or value
+     *         prevents it from being stored in this map
+     * @throws NullPointerException if the specified key or value is null,
+     *         and this map does not permit null keys or values
+     * @throws IllegalArgumentException if some property of the specified key
+     *         or value prevents it from being stored in this map
+     */
+    V replace(K key, V value);
+}