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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 java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedAction;
import org.apache.tuscany.sca.core.factory.ObjectCreationException;
import org.apache.tuscany.sca.core.factory.ObjectFactory;
/**
* Injects a value created by an {@link org.apache.tuscany.sca.core.factory.ObjectFactory} on a given field
*
* @version $Rev$ $Date$
*/
public class FieldInjector<T> implements Injector<T> {
private final Field field;
private final ObjectFactory<?> objectFactory;
/**
* Create an injector and have it use the given <code>ObjectFactory</code> to inject a value on the instance using
* the reflected <code>Field</code>
*/
public FieldInjector(Field pField, ObjectFactory<?> objectFactory) {
field = pField;
// Allow privileged access to set accessibility. Requires ReflectPermission
// in security policy.
AccessController.doPrivileged(new PrivilegedAction<Object>() {
public Object run() {
field.setAccessible(true); // ignore Java accessibility
return null;
}
});
this.objectFactory = objectFactory;
}
/**
* Inject a new value on the given instance
*/
public void inject(T instance) throws ObjectCreationException {
try {
field.set(instance, objectFactory.getInstance());
} catch (IllegalAccessException e) {
throw new ObjectCreationException("Field is not accessible [" + field + "]", e);
}
}
}
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