001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *   http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    
020    package org.apache.myfaces.tobago.taglib.component;
021    
022    import javax.servlet.jsp.tagext.TagData;
023    import javax.servlet.jsp.tagext.TagExtraInfo;
024    import javax.servlet.jsp.tagext.ValidationMessage;
025    
026    /*
027     * Date: 19.04.2006
028     * Time: 10:56:39
029     */
030    public class CommandTagExtraInfo extends TagExtraInfo {
031      private static final ValidationMessage[] EMPTY_MESSAGE = new ValidationMessage[0];
032    
033      public ValidationMessage[] validate(TagData data) {
034        Object action = data.getAttribute("action");
035        Object onclick = data.getAttribute("onclick");
036        Object link = data.getAttribute("link");
037    
038        if (link != null && !(action == null && onclick == null)) {
039          return generateValidationMessages(data);
040        }
041        return EMPTY_MESSAGE;
042      }
043    
044      private ValidationMessage[] generateValidationMessages(TagData data) {
045        ValidationMessage[] messages = new ValidationMessage[1];
046        messages[0] = new ValidationMessage(data.getId(),
047            "Only one Attribute of action, onclick and link is allowed");
048        return messages;
049      }
050    }