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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) 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;
	}
}