/*
* 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.commons.jxpath.servlet;
import org.apache.commons.jxpath.Variables;
/**
* Implementation of the Variables interface that provides access
* to a single object using a reserved name (keyword).
*
* @author Dmitri Plotnikov
* @version $Revision: 652925 $ $Date: 2008-05-02 17:05:41 -0500 (Fri, 02 May 2008) $
*/
public class KeywordVariables implements Variables {
private static final long serialVersionUID = 894145608741325442L;
private String keyword;
private Object object;
/**
* Create a new KeywordVariables.
* @param keyword String
* @param object value
*/
public KeywordVariables(String keyword, Object object) {
if (keyword == null) {
throw new IllegalArgumentException("keyword cannot be null");
}
this.keyword = keyword;
this.object = object;
}
public boolean isDeclaredVariable(String variable) {
return variable.equals(keyword);
}
public Object getVariable(String variable) {
return isDeclaredVariable(variable) ? object : null;
}
public void declareVariable(String variable, Object value) {
throw new UnsupportedOperationException(
"Cannot declare new keyword variables.");
}
public void undeclareVariable(String variable) {
throw new UnsupportedOperationException(
"Cannot undeclare keyword variables.");
}
}
|