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The AspectJ matcher can be used for matching pointcuts independently of any AspectJ compilation or weaving steps. Most notably, this can be used by frameworks such as Spring AOP which utilise the @AspectJ pointcut syntax but implement aspect weaving in a way independent of AspectJ, e.g. using dynamic proxies.

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/* *******************************************************************
 * Copyright (c) 2005-2010 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:
 * Andy Clement (IBM, SpringSource)
 * ******************************************************************/

package org.aspectj.weaver;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.aspectj.weaver.AjAttribute.WeaverVersionInfo;

/**
 * Lightweight subclass of DataInputStream that knows what version of the weaver was used to construct the data in it. The input
 * stream has a constant pool reader attached which enables it to decode constant pool references found within the data being read.
 *
 * @author Andy Clement
 */
public class VersionedDataInputStream extends DataInputStream {

	private WeaverVersionInfo version = new WeaverVersionInfo();// assume we are the latest unless something tells us otherwise...

	private ConstantPoolReader constantPoolReader;

	public VersionedDataInputStream(InputStream is, ConstantPoolReader constantPoolReader) {
		super(is);
		this.constantPoolReader = constantPoolReader;
	}

	public int getMajorVersion() {
		return version.getMajorVersion();
	}

	public int getMinorVersion() {
		return version.getMinorVersion();
	}

	public long getBuildstamp() {
		return version.getBuildstamp();
	}

	public void setVersion(WeaverVersionInfo version) {
		this.version = version;
	}

	public String readUtf8(int cpIndex) {
		if (constantPoolReader == null) {
			throw new IllegalStateException();
		}
		if (cpIndex < 0) {
			throw new IllegalStateException(cpIndex + "");
		}
		return constantPoolReader.readUtf8(cpIndex);
	}

	public boolean canDecompress() {
		return constantPoolReader != null;
	}

	public boolean isAtLeast169() {
		return getMajorVersion() >= AjAttribute.WeaverVersionInfo.WEAVER_VERSION_AJ169;
	}

	public String readPath() throws IOException {
		return readUtf8(readShort());
	}

	public String readSignature() throws IOException {
		return readUtf8(readShort());
	}

	public UnresolvedType readSignatureAsUnresolvedType() throws IOException {
		return UnresolvedType.forSignature(readUtf8(readShort()));
	}

	public String toString() {
		return "VersionedDataInputStream: version=" + version + " constantPoolReader?" + (constantPoolReader != null);
	}
}