| // Copyright 2004, 2005 The Apache Software Foundation |
| // |
| // 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. |
| |
| package org.apache.tapestry.binding; |
| |
| 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.coerce.ValueConverter; |
| |
| /** |
| * A binding that is connected to an asset provided by a component. |
| * |
| * @author Howard M. Lewis Ship |
| * @since 4.0 |
| */ |
| public class AssetBinding extends AbstractBinding |
| { |
| private final IComponent _component; |
| |
| public AssetBinding(String description, ValueConverter valueConverter, Location location, |
| IComponent component, String assetName) |
| { |
| super(assetName, valueConverter, location); |
| |
| Defense.notNull(component, "component"); |
| Defense.notNull(assetName, "assetName"); |
| |
| _component = component; |
| } |
| |
| public Object getObject() |
| { |
| IAsset result = _component.getAsset(_description); |
| |
| if (result == null) |
| throw new BindingException(BindingMessages.missingAsset(_component, _description), |
| _component, getLocation(), this, null); |
| |
| return result; |
| } |
| |
| public Object getComponent() |
| { |
| return _component; |
| } |
| } |