org.aspectj.ajdt.internal.core.builder.EclipseClassPathManager Maven / Gradle / Ivy

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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) 2004 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.aspectj.ajdt.internal.core.builder;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.aspectj.bridge.IMessageHandler;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.bcel.ClassPathManager;
import org.aspectj.org.eclipse.jdt.core.compiler.CharOperation;
import org.aspectj.org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader;
import org.aspectj.org.eclipse.jdt.internal.compiler.env.IBinaryType;
import org.aspectj.org.eclipse.jdt.internal.compiler.env.INameEnvironment;
import org.aspectj.org.eclipse.jdt.internal.compiler.env.NameEnvironmentAnswer;

/**
 * @author colyer
 *
 * Provide a type lookup environment for the weaver, without having to convert
 * the various eclipse paths into their external form.
 */
public class EclipseClassPathManager extends ClassPathManager {

	private INameEnvironment nameEnv;

	public EclipseClassPathManager(INameEnvironment env) {
		this.nameEnv = env;
	}

	// class path manager will be used by weaver across multiple compiles,
	// whereas a name environment may be constructed per-compile.
	public void setNameEnvironment(INameEnvironment env) {
		this.nameEnv = env;
	}

	/* (non-Javadoc)
	 * @see org.aspectj.weaver.bcel.ClassPathManager#addPath(java.lang.String, org.aspectj.bridge.IMessageHandler)
	 */
	public void addPath(String name, IMessageHandler handler) {
		throw new UnsupportedOperationException("Can't add paths to an *Eclipse*ClassPathManager.");
	}

	/* (non-Javadoc)
	 * @see org.aspectj.weaver.bcel.ClassPathManager#find(org.aspectj.weaver.UnresolvedType)
	 */
	public ClassFile find(UnresolvedType type) {
		ClassFile cf = null;
		String name = type.getName();
		if (name.endsWith(".class")) {
			name = name.substring(0,name.length() - ".class".length());
		}
		char[][] cname = CharOperation.splitOn('.',name.toCharArray());
		// TODO [j9] passing null client/module here...
		NameEnvironmentAnswer answer = nameEnv.findType(cname);
		if (answer == null || !answer.isBinaryType()) {
			return null;
		} else {
			IBinaryType binType = answer.getBinaryType();
			// XXX - but better than the alternative hacks
			if (binType instanceof ClassFileReader) {
				ClassFileReader cfr = (ClassFileReader) binType;
				cf = new ClassFileReaderBackedClassFile(cfr);
			} else {
				throw new IllegalArgumentException(
						"I'm only geared up to handle ClassFileReaders, and you gave me a " +
						binType.getClass().getName());
			}
			return cf;
		}
	}
	/* (non-Javadoc)
	 * @see org.aspectj.weaver.bcel.ClassPathManager#getAllClassFiles()
	 */
	public List getAllClassFiles() {
		throw new UnsupportedOperationException("I don't implement getAllClassFiles()");
		//return Collections.EMPTY_LIST;
	}
	/* (non-Javadoc)
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		StringBuilder buf = new StringBuilder("EclipseClassPathManager: ");
		buf.append(nameEnv.toString());
		return buf.toString();
	}

	private class ClassFileReaderBackedClassFile extends ClassPathManager.ClassFile {

		private ClassFileReader source;
		private InputStream is;

		public ClassFileReaderBackedClassFile(ClassFileReader cfr) {
			source = cfr;
		}

		/* (non-Javadoc)
		 * @see org.aspectj.weaver.bcel.ClassPathManager.ClassFile#getInputStream()
		 */
		public InputStream getInputStream() throws IOException {
			is = new ByteArrayInputStream(source.getReferenceBytes());
			return is;
		}

		public void close() {
			try {
				if (is!=null) is.close();
			} catch (IOException e) {
				// Should never happen !
				e.printStackTrace();
			}
		}

		/* (non-Javadoc)
		 * @see org.aspectj.weaver.bcel.ClassPathManager.ClassFile#getPath()
		 */
		public String getPath() {
			return new String(source.getFileName());
		}
	}
}