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The private implementation classes of the Apache MyFaces Core JSF-2.0 Implementation
There is a newer version: 4.1.0-RC2
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.myfaces.view.facelets.tag.jsf;

import java.util.logging.Level;
import java.util.logging.Logger;

import javax.faces.component.UIComponent;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.MetaRule;
import javax.faces.view.facelets.Metadata;
import javax.faces.view.facelets.MetadataTarget;
import javax.faces.view.facelets.TagAttribute;

/**
 * 
 * @author Jacob Hookom
 * @version $Id: ComponentRule.java,v 1.4 2008/07/13 19:01:47 rlubke Exp $
 */
final class ComponentRule extends MetaRule
{

    final class LiteralAttributeMetadata extends Metadata
    {
        private final String _name;
        private final String _value;

        public LiteralAttributeMetadata(String name, String value)
        {
            _name = name;
            _value = value;
        }

        public void applyMetadata(FaceletContext ctx, Object instance)
        {
            ((UIComponent) instance).getAttributes().put(_name, _value);
        }
    }

    final static class ValueExpressionMetadata extends Metadata
    {
        private final String _name;

        private final TagAttribute _attr;

        private final Class _type;

        public ValueExpressionMetadata(String name, Class type, TagAttribute attr)
        {
            _name = name;
            _attr = attr;
            _type = type;
        }

        public void applyMetadata(FaceletContext ctx, Object instance)
        {
            ((UIComponent) instance).setValueExpression(_name, _attr.getValueExpression(ctx, _type));
        }
    }

    //private final static Logger log = Logger.getLogger("facelets.tag.component");
    private final static Logger log = Logger.getLogger(ComponentRule.class.getName());

    public final static ComponentRule Instance = new ComponentRule();

    public ComponentRule()
    {
        super();
    }

    public Metadata applyRule(String name, TagAttribute attribute, MetadataTarget meta)
    {
        if (meta.isTargetInstanceOf(UIComponent.class))
        {
            // if component and dynamic, then must set expression
            if (!attribute.isLiteral())
            {
                Class type = meta.getPropertyType(name);
                if (type == null)
                {
                    type = Object.class;
                }
                
                return new ValueExpressionMetadata(name, type, attribute);
            }
            else if (meta.getWriteMethod(name) == null)
            {

                // this was an attribute literal, but not property
                warnAttr(attribute, meta.getTargetClass(), name);

                return new LiteralAttributeMetadata(name, attribute.getValue());
            }
        }
        return null;
    }

    private static void warnAttr(TagAttribute attr, Class type, String n)
    {
        if (log.isLoggable(Level.FINER))
        {
            log.finer(attr + " Property '" + n + "' is not on type: " + type.getName());
        }
    }

}