// Copyright 2007 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 static java.lang.String.format;
import org.apache.tapestry.annotations.Path;
import org.apache.tapestry.ioc.ObjectLocator;
import org.apache.tapestry.ioc.services.SymbolSource;
import org.apache.tapestry.model.MutableComponentModel;
import org.apache.tapestry.services.AssetSource;
import org.apache.tapestry.services.ClassTransformation;
import org.apache.tapestry.services.InjectionProvider;
/**
* Performs injection of assets, based on the presence of the {@link Path} annotation. This is more
* useful than the general {@link AssetObjectProvider}, becase relative assets are supported.
*/
public class AssetInjectionProvider implements InjectionProvider
{
private final SymbolSource _symbolSource;
private final AssetSource _assetSource;
public AssetInjectionProvider(SymbolSource symbolSource, AssetSource assetSource)
{
_symbolSource = symbolSource;
_assetSource = assetSource;
}
public boolean provideInjection(String fieldName, Class fieldType, ObjectLocator locator,
ClassTransformation transformation, MutableComponentModel componentModel)
{
Path path = transformation.getFieldAnnotation(fieldName, Path.class);
if (path == null) return false;
String expanded = _symbolSource.expandSymbols(path.value());
String sourceFieldName = transformation.addInjectedField(
AssetSource.class,
"assetSource",
_assetSource);
String resourcesFieldName = transformation.getResourcesFieldName();
String statement = format(
"%s = (%s) %s.findAsset(%s.getBaseResource(), \"%s\", %s.getLocale());",
fieldName,
fieldType.getName(),
sourceFieldName,
resourcesFieldName,
expanded,
resourcesFieldName);
transformation.extendConstructor(statement);
transformation.makeReadOnly(fieldName);
return true;
}
}