src/java/org/apache/commons/jelly/xpath/XPathTagSupport.java

/*
 * 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.jelly.xpath;

import org.apache.commons.jelly.TagSupport;

/** An abstract base class useful for implementation inheritance
  *
  * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
  * @version $Revision$
  */
public abstract class XPathTagSupport extends TagSupport {

    // Implementation methods
    //-------------------------------------------------------------------------
    protected Object getXPathContext() {
        XPathSource tag = (XPathSource) findAncestorWithClass( XPathSource.class );
        if ( tag != null ) {
            return tag.getXPathSource();
        }
        return null;
    }
}