// Copyright 2007, 2008 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.internal.services;
import org.apache.tapestry.Asset;
import org.apache.tapestry.annotations.Path;
import org.apache.tapestry.ioc.AnnotationProvider;
import org.apache.tapestry.ioc.ObjectLocator;
import org.apache.tapestry.ioc.ObjectProvider;
import org.apache.tapestry.ioc.services.Builtin;
import org.apache.tapestry.ioc.services.SymbolSource;
import org.apache.tapestry.ioc.services.TypeCoercer;
import org.apache.tapestry.services.AssetSource;
import org.apache.tapestry.services.Core;
/**
* Exposes assets (in the current locale). The Inject annotation must be supplemented by a
* {@link Path} annotation, to identify what asset to be injected.
*/
public class AssetObjectProvider implements ObjectProvider
{
private final AssetSource _source;
private final TypeCoercer _typeCoercer;
private final SymbolSource _symbolSource;
public AssetObjectProvider(@Core AssetSource source,
@Builtin TypeCoercer typeCoercer,
@Builtin SymbolSource symbolSource)
{
_source = source;
_typeCoercer = typeCoercer;
_symbolSource = symbolSource;
}
/**
* Provides the asset. If the expression does not identify an asset domain, with a prefix, it is
* assumed to be a path on the classpath, relative to the root of the classpath.
*
* @param objectType the type of object (which must be Object or Asset)
* @param locator not used
*/
public <T> T provide(Class<T> objectType, AnnotationProvider annotationProvider, ObjectLocator locator)
{
Path path = annotationProvider.getAnnotation(Path.class);
if (path == null) return null;
String expanded = _symbolSource.expandSymbols(path.value());
Asset asset = _source.getAsset(null, expanded, null);
return _typeCoercer.coerce(asset, objectType);
}
}