1 files changed, 196 insertions, 0 deletions
diff --git a/velocity-engine-core/src/main/java/org/apache/velocity/VelocityContext.java b/velocity-engine-core/src/main/java/org/apache/velocity/VelocityContext.java
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index 00000000..9b4a6e4a
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+++ b/velocity-engine-core/src/main/java/org/apache/velocity/VelocityContext.java
@@ -0,0 +1,196 @@
+package org.apache.velocity;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+import org.apache.velocity.context.AbstractContext;
+import org.apache.velocity.context.Context;
+
+import java.io.Serializable;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ *  General purpose implementation of the application Context
+ *  interface for general application use.  This class should
+ *  be used in place of the original Context class.
+ *
+ *  This implementation uses a HashMap  (@see java.util.HashMap )
+ *  for data storage.
+ *
+ *  This context implementation cannot be shared between threads
+ *  without those threads synchronizing access between them, as
+ *  the HashMap is not synchronized, nor are some of the fundamentals
+ *  of AbstractContext.  If you need to share a Context between
+ *  threads with simultaneous access for some reason, please create
+ *  your own and extend the interface Context
+ *
+ *  @see org.apache.velocity.context.Context
+ *
+ *  @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
+ *  @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
+ *  @author <a href="mailto:fedor.karpelevitch@home.com">Fedor Karpelevitch</a>
+ *  @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall</a>
+ *  @version $Id$
+ */
+public class VelocityContext
+    extends AbstractContext
+    implements Cloneable, Serializable
+{
+    /**
+     * Version Id for serializable
+     */
+    private static final long serialVersionUID = 9033846851064645037L;
+
+    /**
+     *  Storage for key/value pairs.
+     */
+    private Map<String, Object> context = null;
+
+    /**
+     *  Creates a new instance (with no inner context).
+     */
+    public VelocityContext()
+    {
+        this(null, null);
+    }
+
+    /**
+     *  Creates a new instance with the provided storage (and no inner
+     *  context).
+     * @param context
+     */
+    public VelocityContext(Map<String, Object> context)
+    {
+        this(context, null);
+    }
+
+    /**
+     *  Chaining constructor, used when you want to
+     *  wrap a context in another.  The inner context
+     *  will be 'read only' - put() calls to the
+     *  wrapping context will only effect the outermost
+     *  context
+     *
+     *  @param innerContext The <code>Context</code> implementation to
+     *  wrap.
+     */
+    public VelocityContext( Context innerContext )
+    {
+        this(null, innerContext);
+    }
+
+    /**
+     *  Initializes internal storage (never to <code>null</code>), and
+     *  inner context.
+     *
+     *  @param context Internal storage, or <code>null</code> to
+     *  create default storage.
+     *  @param innerContext Inner context.
+     */
+    public VelocityContext(Map<String, Object> context, Context innerContext)
+    {
+        super(innerContext);
+        this.context = (context == null ? new HashMap<>() : context);
+    }
+
+    /**
+     *  retrieves value for key from internal
+     *  storage
+     *
+     *  @param key name of value to get
+     *  @return value as object
+     */
+    @Override
+    public Object internalGet(String key )
+    {
+        return context.get( key );
+    }
+
+    /**
+     *  stores the value for key to internal
+     *  storage
+     *
+     *  @param key name of value to store
+     *  @param value value to store
+     *  @return previous value of key as Object
+     */
+    @Override
+    public Object internalPut(String key, Object value )
+    {
+        return context.put( key, value );
+    }
+
+    /**
+     *  determines if there is a value for the
+     *  given key
+     *
+     *  @param key name of value to check
+     *  @return true if non-null value in store
+     */
+    @Override
+    public  boolean internalContainsKey(String key)
+    {
+        return context.containsKey( key );
+    }
+
+    /**
+     *  returns array of keys
+     *
+     *  @return keys as []
+     */
+    @Override
+    public  String[] internalGetKeys()
+    {
+        return context.keySet().toArray(new String[context.size()]);
+    }
+
+    /**
+     *  remove a key/value pair from the
+     *  internal storage
+     *
+     *  @param key name of value to remove
+     *  @return value removed
+     */
+    @Override
+    public  Object internalRemove(String key)
+    {
+        return context.remove( key );
+    }
+
+    /**
+     * Clones this context object.
+     *
+     * @return A shallow copy of this <code>Context</code>.
+     */
+    @Override
+    public Object clone()
+    {
+        VelocityContext clone = null;
+        try
+        {
+            clone = (VelocityContext) super.clone();
+            clone.context = new HashMap<>(context);
+        }
+        catch (CloneNotSupportedException ignored)
+        {
+        }
+        return clone;
+    }
+}