/*

  * 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;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 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;

 import javax.faces.view.facelets.TagAttributeException;

 /**

  * 

  * @author Jacob Hookom

  * @version $Id$

  */

 public final class BeanPropertyTagRule extends MetaRule

 {

     public final static BeanPropertyTagRule INSTANCE = new BeanPropertyTagRule();

     public Metadata applyRule(String name, TagAttribute attribute, MetadataTarget meta)

     {

         Method m = meta.getWriteMethod(name);

         // if the property is writable

         if (m != null)

         {

             if (attribute.isLiteral())

             {

                 return new LiteralPropertyMetadata(m, attribute);

             }

             else

             {

                 return new DynamicPropertyMetadata(m, attribute);

             }

         }

         return null;

     }

     final static class LiteralPropertyMetadata extends Metadata

     {

         private final Method method;

         private final TagAttribute attribute;

         private Object[] value;

         public LiteralPropertyMetadata(Method method, TagAttribute attribute)

         {

             this.method = method;

             this.attribute = attribute;

         }

         public void applyMetadata(FaceletContext ctx, Object instance)

         {

             if (value == null)

             {

                 String str = this.attribute.getValue();

                 value = new Object[] { ctx.getExpressionFactory().coerceToType(str, method.getParameterTypes()[0]) };

             }

             try

             {

                 method.invoke(instance, this.value);

             }

             catch (InvocationTargetException e)

             {

                 throw new TagAttributeException(this.attribute, e.getCause());

             }

             catch (Exception e)

             {

                 throw new TagAttributeException(this.attribute, e);

             }

         }

     }

     final static class DynamicPropertyMetadata extends Metadata

     {

         private final Method method;

         private final TagAttribute attribute;

         private final Class<?> type;

         public DynamicPropertyMetadata(Method method, TagAttribute attribute)

         {

             this.method = method;

             this.type = method.getParameterTypes()[0];

             this.attribute = attribute;

         }

         public void applyMetadata(FaceletContext ctx, Object instance)

         {

             try

             {

                 method.invoke(instance, new Object[] { attribute.getObject(ctx, type) });

             }

             catch (InvocationTargetException e)

             {

                 throw new TagAttributeException(attribute, e.getCause());

             }

             catch (Exception e)

             {

                 throw new TagAttributeException(attribute, e);

             }

         }

     }

 }