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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.FacesException;
27  import javax.faces.component.UIComponent;
28  import javax.faces.view.facelets.ComponentHandler;
29  import javax.faces.view.facelets.FaceletContext;
30  import javax.faces.view.facelets.TagAttribute;
31  import javax.faces.view.facelets.TagConfig;
32  import javax.faces.view.facelets.TagException;
33  import javax.faces.view.facelets.TagHandler;
34  
35  public final class DataAttributeHandler extends TagHandler {
36  
37    private final TagAttribute name;
38  
39    private final TagAttribute value;
40  
41    public DataAttributeHandler(TagConfig config) {
42      super(config);
43      this.name = getRequiredAttribute(Attributes.NAME);
44      this.value = getRequiredAttribute(Attributes.VALUE);
45    }
46  
47    public void apply(FaceletContext faceletContext, UIComponent parent)
48        throws FacesException, ELException {
49      if (parent == null) {
50        throw new TagException(tag, "Parent UIComponent was null");
51      }
52  
53      if (ComponentHandler.isNew(parent)) {
54  
55        Object attributeName = name.isLiteral()
56            ? (Object) name.getValue(faceletContext)
57            : name.getValueExpression(faceletContext, Object.class);
58        Object attributeValue = value.isLiteral()
59            ? (Object) value.getValue(faceletContext)
60            : value.getValueExpression(faceletContext, Object.class);
61        ComponentUtils.putDataAttribute(parent, attributeName, attributeValue);
62      }
63    }
64  }