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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package org.apache.myfaces.tobago.internal.taglib.component;
21  
22  import javax.servlet.jsp.tagext.TagData;
23  import javax.servlet.jsp.tagext.TagExtraInfo;
24  import javax.servlet.jsp.tagext.ValidationMessage;
25  
26  public class CommandTagExtraInfo extends TagExtraInfo {
27    private static final ValidationMessage[] EMPTY_MESSAGE = new ValidationMessage[0];
28  
29    public ValidationMessage[] validate(TagData data) {
30      Object action = data.getAttribute("action");
31      Object onclick = data.getAttribute("onclick");
32      Object link = data.getAttribute("link");
33  
34      if (link != null && !(action == null && onclick == null)) {
35        return generateValidationMessages(data);
36      }
37      return EMPTY_MESSAGE;
38    }
39  
40    private ValidationMessage[] generateValidationMessages(TagData data) {
41      ValidationMessage[] messages = new ValidationMessage[1];
42      messages[0] = new ValidationMessage(data.getId(),
43          "Only one Attribute of action, onclick and link is allowed");
44      return messages;
45    }
46  }