Merge tag 'v2.3.20' into testing

[gpl/argeo-jcr.git] / org.argeo.slc.repo / src / org / eclipse / aether / DefaultSessionData.java

diff --git a/org.argeo.slc.repo/src/org/eclipse/aether/DefaultSessionData.java b/org.argeo.slc.repo/src/org/eclipse/aether/DefaultSessionData.java
new file mode 100644 (file)
index 0000000..738cebc
--- /dev/null
+++ b/org.argeo.slc.repo/src/org/eclipse/aether/DefaultSessionData.java
@@ -0,0 +1,82 @@
+/*******************************************************************************
+ * Copyright (c) 2010, 2014 Sonatype, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Sonatype, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.aether;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+/**
+ * A simple session data storage backed by a thread-safe map.
+ */
+public final class DefaultSessionData
+    implements SessionData
+{
+
+    private final ConcurrentMap<Object, Object> data;
+
+    public DefaultSessionData()
+    {
+        data = new ConcurrentHashMap<Object, Object>();
+    }
+
+    public void set( Object key, Object value )
+    {
+        if ( key == null )
+        {
+            throw new IllegalArgumentException( "key must not be null" );
+        }
+
+        if ( value != null )
+        {
+            data.put( key, value );
+        }
+        else
+        {
+            data.remove( key );
+        }
+    }
+
+    public boolean set( Object key, Object oldValue, Object newValue )
+    {
+        if ( key == null )
+        {
+            throw new IllegalArgumentException( "key must not be null" );
+        }
+
+        if ( newValue != null )
+        {
+            if ( oldValue == null )
+            {
+                return data.putIfAbsent( key, newValue ) == null;
+            }
+            return data.replace( key, oldValue, newValue );
+        }
+        else
+        {
+            if ( oldValue == null )
+            {
+                return !data.containsKey( key );
+            }
+            return data.remove( key, oldValue );
+        }
+    }
+
+    public Object get( Object key )
+    {
+        if ( key == null )
+        {
+            throw new IllegalArgumentException( "key must not be null" );
+        }
+
+        return data.get( key );
+    }
+
+}