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