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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) 2005-2010 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);
	}
}