/*
* 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.cocoon.components.expression;
import java.util.HashMap;
import java.util.Map;
import org.apache.cocoon.xml.NamespacesTable;
/**
* @version $Id: ExpressionContext.java 449189 2006-09-23 06:52:29Z crossley $
*/
public class ExpressionContext extends HashMap {
private ExpressionContext closure;
private Object contextBean;
private NamespacesTable namespaces;
public ExpressionContext() {
this(null);
}
public ExpressionContext(ExpressionContext closure) {
this.closure = closure;
if (closure == null) {
this.namespaces = new NamespacesTable();
} else {
// Reuse the parent one. Users of the context should correctly enter and leave namespace scopes.
this.namespaces = closure.namespaces;
}
}
/**
* Get the namespace table that tracks the applicable namespace prefix mappings
* for the expression context.
*
* @return the namespaces table
*/
public NamespacesTable getNamespaces() {
return this.namespaces;
}
public Object getContextBean() {
if (contextBean != null)
return contextBean;
else if (closure != null)
return closure.getContextBean();
else
return null;
}
public void setContextBean(Object contextBean) {
this.contextBean = contextBean;
}
public Map getVars() {
return this;
}
public void setVars(Map map) {
clear();
putAll(map);
}
public boolean containsKey(Object key) {
return this.get(key) != null;
}
public Object get(Object key) {
if (key.equals("this")) {
return this;
}
Object result = super.get(key);
if (result == null && closure != null) {
result = closure.get(key);
}
return result;
}
}