/*

  *  Copyright 2007 Tacos.

  * 

  *  Licensed 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.

  *  under the License.

  */

 package net.sf.tacos.binding;

 import net.sf.tacos.asset.AbsoluteAsset;

 import org.apache.hivemind.Location;

 import org.apache.hivemind.util.Defense;

 import org.apache.tapestry.BindingException;

 import org.apache.tapestry.IAsset;

 import org.apache.tapestry.IComponent;

 import org.apache.tapestry.binding.AbstractBinding;

 import org.apache.tapestry.coerce.ValueConverter;

 import org.apache.tapestry.services.AbsoluteURLBuilder;

 /**

  * A binding that is connected to an asset provided by a component.

  * 

  * @author Andreas Andreou

  * @since 4.1

  */

 public class AbsoluteAssetBinding extends AbstractBinding

 {

     private final IComponent component;

     private AbsoluteURLBuilder absoluteURLBuilder;

     public AbsoluteAssetBinding(String description, ValueConverter valueConverter, 

             AbsoluteURLBuilder absoluteURLBuilder, Location location, IComponent component, String assetName)

     {

         super(assetName, valueConverter, location);

         Defense.notNull(component, "component");

         Defense.notNull(assetName, "assetName");

         this.component = component;

         this.absoluteURLBuilder = absoluteURLBuilder;

     }

     public Object getObject()

     {

         IAsset asset = component.getAsset(_description);

         if (asset == null)

             throw new BindingException("Component " + component.getExtendedId() + 

                     " does not contain an asset named ''" + _description + "''.",

                     component, getLocation(), this, null);

         return new AbsoluteAsset(asset, absoluteURLBuilder);

     }

     public Object getComponent()

     {

         return component;

     }

 }