/*
* $Id$
*
* 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.
*/
package org.apache.struts2.views.jasperreports;
import com.opensymphony.xwork2.util.ValueStack;
import java.util.HashMap;
import java.util.Set;
/**
* Ported to Struts:
*
*/
public class ValueStackShadowMap extends HashMap {
private static final long serialVersionUID = -167109778490907240L;
/**
* valueStack reference
*/
ValueStack valueStack;
/**
* entries reference
*/
Set entries;
/**
* Constructs an instance of ValueStackShadowMap.
*
* @param valueStack - the underlying valuestack
*/
public ValueStackShadowMap(ValueStack valueStack) {
this.valueStack = valueStack;
}
/**
* Implementation of containsKey(), overriding HashMap implementation.
*
* @param key - The key to check in HashMap and if not found to check on valueStack.
* @return <tt>true</tt>, if conatins key, <tt>false</tt> otherwise.
* @see java.util.HashMap#containsKey
*/
public boolean containsKey(Object key) {
boolean hasKey = super.containsKey(key);
if (!hasKey) {
if (valueStack.findValue((String) key) != null) {
hasKey = true;
}
}
return hasKey;
}
/**
* Implementation of get(), overriding HashMap implementation.
*
* @param key - The key to get in HashMap and if not found there from the valueStack.
* @return value - The object from HashMap or if null, from the valueStack.
* @see java.util.HashMap#get
*/
public Object get(Object key) {
Object value = super.get(key);
if ((value == null) && key instanceof String) {
value = valueStack.findValue((String) key);
}
return value;
}
}