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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*
 * Copyright (c) OSGi Alliance (2011, 2013). All Rights Reserved.
 * 
 * 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.osgi.framework.hooks.bundle;

import java.util.Collection;
import org.osgi.annotation.versioning.ConsumerType;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;

/**
 * OSGi Framework Bundle Context Hook Service.
 * 
 * 
 * Bundles registering this service will be called during framework bundle find
 * (get bundles) operations.
 * 
 * @ThreadSafe
 * @author $Id: 1029e10212f150304095fc99433197083cc00e9e $
 */
@ConsumerType
public interface FindHook {
	/**
	 * Find hook method. This method is called for the following:
	 * 

	 * Bundle find operations using {@link BundleContext#getBundle(long)}
	 * and {@link BundleContext#getBundles()} methods. The find method can
	 * filter the result of the find operation. Note that a find operation using
	 * the {@link BundleContext#getBundle(String)} method does not cause the
	 * find method to be called.
	 * Bundle install operations when an existing bundle is already
	 * installed at a given location. In this case, the find method is called to
	 * determine if the context performing the install operation is able to find
	 * the bundle. If the context cannot find the existing bundle then the
	 * install operation must fail with a
	 * {@link BundleException#REJECTED_BY_HOOK} exception.
	 * 
	 * 
	 * @param context The bundle context of the bundle performing the find
	 *        operation.
	 * @param bundles A collection of Bundles to be returned as a result of the
	 *        find operation. The implementation of this method may remove
	 *        bundles from the collection to prevent the bundles from being
	 *        returned to the bundle performing the find operation. The
	 *        collection supports all the optional {@code Collection} operations
	 *        except {@code add} and {@code addAll}. Attempting to add to the
	 *        collection will result in an {@code UnsupportedOperationException}
	 *        . The collection is not synchronized.
	 */
	void find(BundleContext context, Collection bundles);
}