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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.core.injection;
import org.apache.tuscany.spi.ObjectCreationException;
import org.apache.tuscany.spi.ObjectFactory;
import org.apache.tuscany.spi.component.AtomicComponent;
import org.apache.tuscany.spi.component.CompositeComponent;
import org.apache.tuscany.spi.component.SCAObject;
import org.apache.tuscany.spi.component.TargetResolutionException;
import org.apache.tuscany.spi.host.ResourceHost;
import org.apache.tuscany.spi.host.ResourceResolutionException;
import org.apache.tuscany.spi.wire.InboundWire;
/**
* Resolves a runtime resource to be injected on a field or method of a Java component type marked with {@link
* org.osoa.sca.annotations.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 CompositeComponent parent;
private ResourceHost host;
private boolean resolveFromHost;
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 parent the parent composite of the component to inject on
* @param host the runtime resource provider
*/
public ResourceObjectFactory(Class<T> type,
boolean optional,
CompositeComponent parent,
ResourceHost host) {
this.type = type;
this.parent = parent;
this.host = host;
this.optional = optional;
}
/**
* 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 parent the parent composite of the component to inject on
* @param host the runtime resource provider
*/
public ResourceObjectFactory(Class<T> type,
String mappedName,
boolean optional,
CompositeComponent parent,
ResourceHost host) {
this.type = type;
this.parent = parent;
this.host = host;
if (mappedName.indexOf("://") >= 0) {
this.resolveFromHost = true;
}
this.mappedName = mappedName;
this.optional = optional;
}
@SuppressWarnings({"unchecked"})
public T getInstance() throws ObjectCreationException {
if (resolveFromHost) {
return resolveInstance();
} else {
T instance = null;
if (mappedName == null) {
try {
InboundWire wire = parent.resolveSystemAutowire(type);
if (wire != null) {
instance = (T) wire.getTargetService();
}
} catch (TargetResolutionException e) {
throw new ObjectCreationException(e);
}
if (instance == null) {
// if not found in parent scope, search the host namespace
resolveFromHost = true;
instance = resolveInstance();
}
if (instance == null && !optional) {
throw new ResourceNotFoundException("No resource found matching type", type.getName());
}
return instance;
} else {
SCAObject child = parent.getSystemChild(mappedName);
if (child instanceof AtomicComponent) {
try {
AtomicComponent component = (AtomicComponent) child;
instance = type.cast(component.getTargetInstance());
} catch (TargetResolutionException e) {
throw new ObjectCreationException(e);
}
} else if (child != null) {
throw new InvalidResourceTypeException("Invalid resource type", mappedName);
} else if (!optional) {
throw new ResourceNotFoundException("No resource found for URI", mappedName);
}
return instance;
}
}
}
private T resolveInstance() {
try {
if (mappedName == null) {
return host.resolveResource(type);
} else {
return host.resolveResource(type, mappedName);
}
} catch (ResourceResolutionException e) {
throw new ObjectCreationException(e);
}
}
}
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