001    /*
002     * Copyright 1999-2001,2004 The Apache Software Foundation.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     * 
008     *      http://www.apache.org/licenses/LICENSE-2.0
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.apache.commons.latka.jelly;
018    
019    import org.apache.commons.jelly.JellyTagException;
020    import org.apache.commons.jelly.TagSupport;
021    import org.apache.commons.jelly.XMLOutput;
022    
023    import org.apache.commons.latka.LatkaException;
024    import org.apache.commons.latka.http.Response;
025    
026    /**
027     *
028     * @author  Morgan Delagrange
029     */
030    public class ValidateTag extends TagSupport {
031    
032        /**
033         *  make sure the request executes, then call validators.
034         *
035         * @param xmlOutput a place to write output
036         * @throws JellyTagException if the body of the tag could not be invoked, or an HTTP
037         *    response could not be obtained
038         */
039        public void doTag(XMLOutput xmlOutput) throws JellyTagException {
040    
041            // execute the request
042            Response response = null;
043            try {
044                response = getResponse();
045            } catch (LatkaException e) {
046                throw new JellyTagException("could not obtain HTTP response",e);
047            }
048    
049            // perform the validations, skip the validations
050            // if a response could not be obtained
051            if (response != null) {
052                invokeBody(xmlOutput);
053            }
054    
055        }
056    
057        protected Response getResponse() throws LatkaException {
058            RequestTag tag = (RequestTag) findAncestorWithClass(RequestTag.class);
059            return tag.getResponse();
060        }
061    
062    }