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The AspectJ weaver applies aspects to Java classes. It can be used as a Java agent in order to apply load-time weaving (LTW) during class-loading and also contains the AspectJ runtime classes.

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/*******************************************************************************
 * Copyright (c) 2005 Contributors.
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *   David Knibb         initial implementation
 *******************************************************************************/
package org.aspectj.weaver.loadtime;

import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.List;

import org.aspectj.weaver.bcel.BcelWeakClassLoaderReference;
import org.aspectj.weaver.loadtime.definition.Definition;
import org.aspectj.weaver.tools.Trace;
import org.aspectj.weaver.tools.TraceFactory;
import org.aspectj.weaver.tools.WeavingAdaptor;

/**
 * Use in non-OSGi environment
 *
 * @author David Knibb
 */
public class DefaultWeavingContext implements IWeavingContext {

	protected BcelWeakClassLoaderReference loaderRef;
	private String shortName;

	private static Trace trace = TraceFactory.getTraceFactory().getTrace(DefaultWeavingContext.class);

	/**
	 * Construct a new WeavingContext to use the specified ClassLoader This is the constructor which should be used.
	 *
	 * @param loader
	 */
	public DefaultWeavingContext(ClassLoader loader) {
		super();
		this.loaderRef = new BcelWeakClassLoaderReference(loader);
	}

	/**
	 * Same as ClassLoader.getResources()
	 */
	public Enumeration getResources(String name) throws IOException {
		return getClassLoader().getResources(name);
	}

	/**
	 * @return null as we are not in an OSGi environment (therefore no bundles)
	 */
	public String getBundleIdFromURL(URL url) {
		return "";
	}

	/**
	 * @return classname@hashcode
	 */
	public String getClassLoaderName() {
		ClassLoader loader = getClassLoader();
		return ((loader != null) ? loader.getClass().getName() + "@" + Integer.toHexString(System.identityHashCode(loader))
				: "null");
	}

	public ClassLoader getClassLoader() {
		return loaderRef.getClassLoader();
	}

	/**
	 * @return filename
	 */
	public String getFile(URL url) {
		return url.getFile();
	}

	/**
	 * @return unqualifiedclassname@hashcode
	 */
	public String getId() {
		if (shortName == null) {
			shortName = getClassLoaderName().replace('$', '.');
			int index = shortName.lastIndexOf(".");
			if (index != -1) {
				shortName = shortName.substring(index + 1);
			}
		}
		return shortName;
	}

	public String getSuffix() {
		return getClassLoaderName();
	}

	public boolean isLocallyDefined(String classname) {
		String asResource = classname.replace('.', '/').concat(".class");
		ClassLoader loader = getClassLoader();
		URL localURL = loader.getResource(asResource);
		if (localURL == null) {
			return false;
		}

		boolean isLocallyDefined = true;

		ClassLoader parent = loader.getParent();
		if (parent != null) {
			URL parentURL = parent.getResource(asResource);
			if (localURL.equals(parentURL)) {
				isLocallyDefined = false;
			}
		}
		return isLocallyDefined;
	}

	/**
	 * Simply call weaving adaptor back to parse aop.xml
	 *
	 * @param adaptor
	 * @param loader
	 */
	public List getDefinitions(final ClassLoader loader, final WeavingAdaptor adaptor) {
		if (trace.isTraceEnabled()) {
			trace.enter("getDefinitions", this, new Object[] { "goo", adaptor });
		}

		List definitions = ((ClassLoaderWeavingAdaptor) adaptor).parseDefinitions(loader);

		if (trace.isTraceEnabled()) {
			trace.exit("getDefinitions", definitions);
		}
		return definitions;
	}
}