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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* 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.tuscany.core.injection;
import org.apache.tuscany.core.builder.ContextResolver;
import org.apache.tuscany.core.builder.ObjectFactory;
import org.apache.tuscany.core.context.CompositeContext;
import org.apache.tuscany.core.context.Context;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.TargetException;
/**
* Returns a direct reference to a target service exposed in another composite, i.e. the factory avoids creating proxies
* and returns the actual target instance
*
* @version $Rev: 384135 $ $Date: 2006-03-07 22:53:58 -0800 (Tue, 07 Mar 2006) $
*/
public class InterCompositeReferenceFactory<T> implements ObjectFactory<T> {
private ContextResolver resolver;
private QualifiedName targetQualifiedName;
/**
* Reference source is an external service, target is in another module
*
* @param targetName the name of the target service
*/
public InterCompositeReferenceFactory(String targetName) {
targetQualifiedName = new QualifiedName(targetName);
}
public void setContextResolver(ContextResolver resolver){
this.resolver = resolver;
}
public T getInstance() throws ObjectCreationException {
// only return entry points since this is an inter-module wire
Object o = resolver.getCurrentContext().getInstance(targetQualifiedName);
if (o != null) {
return (T) o;
} else {
// walk up the hierarchy of composite contexts
CompositeContext ctx = resolver.getCurrentContext();
do {
if (ctx == null) {
break; // reached top of context hierarchy
}
Context compContext = ctx.getContext(targetQualifiedName.getPartName());
if (compContext != null) {
o = compContext.getInstance(targetQualifiedName);
if (o != null) {
return (T) o;
}
}
ctx = ctx.getParent();
} while (ctx != null);
TargetException e = new TargetException("Target reference not found");
e.setIdentifier(targetQualifiedName.getQualifiedName());
throw e;
}
}
}
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