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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.component.Visual;
24  import org.apache.myfaces.tobago.context.Markup;
25  
26  import javax.el.ValueExpression;
27  import javax.faces.component.UIComponent;
28  import javax.faces.view.facelets.FaceletContext;
29  import javax.faces.view.facelets.MetaRule;
30  import javax.faces.view.facelets.Metadata;
31  import javax.faces.view.facelets.MetadataTarget;
32  import javax.faces.view.facelets.TagAttribute;
33  
34  public class SupportsMarkupRule extends MetaRule {
35  
36    public static final SupportsMarkupRule INSTANCE = new SupportsMarkupRule();
37  
38    @Override
39    public Metadata applyRule(final String name, final TagAttribute attribute, final MetadataTarget metadataTarget) {
40      if (metadataTarget.isTargetInstanceOf(Visual.class)) {
41        Attributes a = Attributes.valueOfFailsafe(name);
42        if (Attributes.markup == a) {
43          return new SupportsMarkupMapper(attribute);
44        }
45      }
46      return null;
47    }
48  
49    static final class SupportsMarkupMapper extends Metadata {
50  
51      private final TagAttribute attribute;
52  
53      public SupportsMarkupMapper(final TagAttribute attribute) {
54        this.attribute = attribute;
55      }
56  
57      @Override
58      public void applyMetadata(final FaceletContext ctx, final Object instance) {
59        if (attribute.isLiteral()) {
60          ((Visual) instance).setMarkup(Markup.valueOf(attribute.getValue()));
61        } else {
62          final ValueExpression expression = attribute.getValueExpression(ctx, Object.class);
63          ((UIComponent) instance).setValueExpression(Attributes.markup.getName(), expression);
64        }
65      }
66    }
67  }