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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.facelets;
21  
22  import org.apache.myfaces.tobago.component.Attributes;
23  import org.apache.myfaces.tobago.util.ComponentUtils;
24  
25  import javax.el.ELException;
26  import javax.faces.component.UIComponent;
27  import javax.faces.view.facelets.ComponentHandler;
28  import javax.faces.view.facelets.FaceletContext;
29  import javax.faces.view.facelets.TagAttribute;
30  import javax.faces.view.facelets.TagConfig;
31  import javax.faces.view.facelets.TagException;
32  import javax.faces.view.facelets.TagHandler;
33  
34  public final class DataAttributeHandler extends TagHandler {
35  
36    private final TagAttribute name;
37  
38    private final TagAttribute value;
39  
40    public DataAttributeHandler(final TagConfig config) {
41      super(config);
42      this.name = getRequiredAttribute(Attributes.NAME);
43      this.value = getRequiredAttribute(Attributes.VALUE);
44    }
45  
46    public void apply(final FaceletContext faceletContext, final UIComponent parent) throws ELException {
47      if (parent == null) {
48        throw new TagException(tag, "Parent UIComponent was null");
49      }
50  
51      if (ComponentHandler.isNew(parent)) {
52  
53        final Object attributeName = name.isLiteral()
54            ? (Object) name.getValue(faceletContext)
55            : name.getValueExpression(faceletContext, Object.class);
56        final Object attributeValue = value.isLiteral()
57            ? (Object) value.getValue(faceletContext)
58            : value.getValueExpression(faceletContext, Object.class);
59        ComponentUtils.putDataAttribute(parent, attributeName, attributeValue);
60      }
61    }
62  }