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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.sca.implementation.java.injection;
import org.apache.tuscany.sca.core.factory.ObjectCreationException;
import org.apache.tuscany.sca.core.factory.ObjectFactory;
import org.apache.tuscany.sca.implementation.java.ResourceHost;
import org.apache.tuscany.sca.implementation.java.ResourceResolutionException;
/**
* Resolves a runtime resource to be injected on a field or method of a Java component type marked with {@link
* javax.annotation.Resource}. If the mapped name of the resource is an absolute URI such as
* <code>sca://localhost</code> or <code>jndi://localhost</code> the host container namespace is searched; otherwise the
* URI is assumed to be relative and the parent composite is searched. If a mapped name is not provided, i.e. resolution
* is by type, the parent composite is first searched followed by the host namespace.
*
* @version $Rev$ $Date$
*/
public class ResourceObjectFactory<T> implements ObjectFactory<T> {
private Class<T> type;
private String mappedName;
private ResourceHost host;
private boolean optional;
/**
* Instantiates a factory that resolves resources by type
*
* @param type the type of the resource to inject
* @param optional true if an error should be thrown if the resource is not found
* @param host the runtime resource provider
*/
public ResourceObjectFactory(Class<T> type, boolean optional, ResourceHost host) {
this(type, null, optional, host);
}
/**
* Instantiates a factory that resolves resources by mapped name
*
* @param type the type of the resource to inject
* @param mappedName the resource name
* @param optional true if an error should be thrown if the resource is not found
* @param host the runtime resource provider
*/
public ResourceObjectFactory(Class<T> type, String mappedName, boolean optional, ResourceHost host) {
this.type = type;
this.host = host;
this.mappedName = mappedName;
this.optional = optional;
}
public T getInstance() throws ObjectCreationException {
try {
T resource;
if (mappedName == null) {
resource = host.resolveResource(type);
if (!optional && resource == null) {
throw new ResourceNotFoundException("Resource not found: " + type.getName());
}
} else {
resource = host.resolveResource(type, mappedName);
if (!optional && resource == null) {
throw new ResourceNotFoundException("Resource not found: " + mappedName);
}
}
return resource;
} catch (ResourceResolutionException e) {
throw new ObjectCreationException(e);
}
}
}
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