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diff --git a/trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/ClassCache.java b/trunk/infrastructure/rhino1_7R1/src/org/mozilla/javascript/ClassCache.java
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+/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (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.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Rhino code, released
+ * May 6, 1999.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1997-1999
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Igor Bukanov, igor@fastmail.fm
+ *   Norris Boyd
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License Version 2 or later (the "GPL"), in which
+ * case the provisions of the GPL are applicable instead of those above. If
+ * you wish to allow use of your version of this file only under the terms of
+ * the GPL and not to allow others to use your version of this file under the
+ * MPL, indicate your decision by deleting the provisions above and replacing
+ * them with the notice and other provisions required by the GPL. If you do
+ * not delete the provisions above, a recipient may use your version of this
+ * file under either the MPL or the GPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+package org.mozilla.javascript;
+
+import java.util.Map;
+import java.util.HashMap;
+
+/**
+ * Cache of generated classes and data structures to access Java runtime
+ * from JavaScript.
+ *
+ * @author Igor Bukanov
+ *
+ * @since Rhino 1.5 Release 5
+ */
+public class ClassCache
+{
+    private static final Object AKEY = new Object();
+    private volatile boolean cachingIsEnabled = true;
+    private HashMap<Class<?>,JavaMembers> classTable
+        = new HashMap<Class<?>,JavaMembers>();
+    private HashMap<Class<?>,JavaMembers> javaAdapterGeneratedClasses
+        = new HashMap<Class<?>,JavaMembers>();
+    private HashMap<JavaAdapter.JavaAdapterSignature,Class<?>> classAdapterCache
+        = new HashMap<JavaAdapter.JavaAdapterSignature,Class<?>>();
+    private HashMap<Class<?>,Object> interfaceAdapterCache;
+    private int generatedClassSerial;
+
+    /**
+     * Search for ClassCache object in the given scope.
+     * The method first calls
+     * {@link ScriptableObject#getTopLevelScope(Scriptable scope)}
+     * to get the top most scope and then tries to locate associated
+     * ClassCache object in the prototype chain of the top scope.
+     *
+     * @param scope scope to search for ClassCache object.
+     * @return previously associated ClassCache object or a new instance of
+     *         ClassCache if no ClassCache object was found.
+     *
+     * @see #associate(ScriptableObject topScope)
+     */
+    public static ClassCache get(Scriptable scope)
+    {
+        ClassCache cache = (ClassCache)
+                ScriptableObject.getTopScopeValue(scope, AKEY);
+        if (cache == null) {
+            throw new RuntimeException("Can't find top level scope for " +
+                    "ClassCache.get");
+        }
+        return cache;
+    }
+
+    /**
+     * Associate ClassCache object with the given top-level scope.
+     * The ClassCache object can only be associated with the given scope once.
+     *
+     * @param topScope scope to associate this ClassCache object with.
+     * @return true if no previous ClassCache objects were embedded into
+     *         the scope and this ClassCache were successfully associated
+     *         or false otherwise.
+     *
+     * @see #get(Scriptable scope)
+     */
+    public boolean associate(ScriptableObject topScope)
+    {
+        if (topScope.getParentScope() != null) {
+            // Can only associate cache with top level scope
+            throw new IllegalArgumentException();
+        }
+        if (this == topScope.associateValue(AKEY, this)) {
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Empty caches of generated Java classes and Java reflection information.
+     */
+    public synchronized void clearCaches()
+    {
+        classTable.clear();
+        javaAdapterGeneratedClasses.clear();
+        classAdapterCache.clear();
+        interfaceAdapterCache = null;
+    }
+
+    /**
+     * Check if generated Java classes and Java reflection information
+     * is cached.
+     */
+    public final boolean isCachingEnabled()
+    {
+        return cachingIsEnabled;
+    }
+
+     /**
+     * Set whether to cache some values.
+     * <p>
+     * By default, the engine will cache the results of
+     * <tt>Class.getMethods()</tt> and similar calls.
+     * This can speed execution dramatically, but increases the memory
+     * footprint. Also, with caching enabled, references may be held to
+     * objects past the lifetime of any real usage.
+     * <p>
+     * If caching is enabled and this method is called with a
+     * <code>false</code> argument, the caches will be emptied.
+     * <p>
+     * Caching is enabled by default.
+     *
+     * @param enabled if true, caching is enabled
+     *
+     * @see #clearCaches()
+     */
+    public synchronized void setCachingEnabled(boolean enabled)
+    {
+        if (enabled == cachingIsEnabled)
+            return;
+        if (!enabled)
+            clearCaches();
+        cachingIsEnabled = enabled;
+    }
+    
+    /**
+     * @return a map from classes to associated JavaMembers objects
+     */
+    Map<Class<?>,JavaMembers> getClassCacheMap() {
+        return classTable;
+    }
+    
+    Map<JavaAdapter.JavaAdapterSignature,Class<?>> getInterfaceAdapterCacheMap()
+    {
+        return classAdapterCache;
+    }
+    
+    /**
+     * @deprecated
+     * The method always returns false.
+     * @see #setInvokerOptimizationEnabled(boolean enabled)
+     */
+    public boolean isInvokerOptimizationEnabled()
+    {
+        return false;
+    }
+
+    /**
+     * @deprecated
+     * The method does nothing.
+     * Invoker optimization is no longer used by Rhino.
+     * On modern JDK like 1.4 or 1.5 the disadvantages of the optimization
+     * like increased memory usage or longer initialization time overweight
+     * small speed increase that can be gained using generated proxy class
+     * to replace reflection.
+     */
+    public synchronized void setInvokerOptimizationEnabled(boolean enabled)
+    {
+    }
+
+    /**
+     * Internal engine method to return serial number for generated classes
+     * to ensure name uniqueness.
+     */
+    public final synchronized int newClassSerialNumber()
+    {
+        return ++generatedClassSerial;
+    }
+
+    Object getInterfaceAdapter(Class<?> cl)
+    {
+        return interfaceAdapterCache == null 
+                    ? null 
+                    : interfaceAdapterCache.get(cl);
+    }
+
+    synchronized void cacheInterfaceAdapter(Class<?> cl, Object iadapter)
+    {
+        if (cachingIsEnabled) {
+            if (interfaceAdapterCache == null) {
+                interfaceAdapterCache = new HashMap<Class<?>,Object>();
+            }
+            interfaceAdapterCache.put(cl, iadapter);
+        }
+    }
+}