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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:
 *   Adrian Colyer			Initial implementation
 * ******************************************************************/
package org.aspectj.weaver.patterns;

import java.io.IOException;

import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.VersionedDataInputStream;

/**
 * @author colyer A list of type variable specifications, eg. <T,S>
 */
public class TypeVariablePatternList extends PatternNode {

	public static final TypeVariablePatternList EMPTY = new TypeVariablePatternList(new TypeVariablePattern[0]);

	private TypeVariablePattern[] patterns;

	public TypeVariablePatternList(TypeVariablePattern[] typeVars) {
		this.patterns = typeVars;
	}

	public TypeVariablePattern[] getTypeVariablePatterns() {
		return this.patterns;
	}

	public TypeVariablePattern lookupTypeVariable(String name) {
		for (TypeVariablePattern pattern : patterns) {
			if (pattern.getName().equals(name)) {
				return pattern;
			}
		}
		return null;
	}

	public boolean isEmpty() {
		return ((patterns == null) || (patterns.length == 0));
	}

	public void write(CompressingDataOutputStream s) throws IOException {
		s.writeInt(patterns.length);
		for (TypeVariablePattern pattern : patterns) {
			pattern.write(s);
		}
		writeLocation(s);
	}

	public static TypeVariablePatternList read(VersionedDataInputStream s, ISourceContext context) throws IOException {
		TypeVariablePatternList ret = EMPTY;
		int length = s.readInt();
		if (length > 0) {
			TypeVariablePattern[] patterns = new TypeVariablePattern[length];
			for (int i = 0; i < patterns.length; i++) {
				patterns[i] = TypeVariablePattern.read(s, context);
			}
			ret = new TypeVariablePatternList(patterns);
		}
		ret.readLocation(context, s); // redundant but safe to read location for EMPTY
		return ret;
	}

	public Object accept(PatternNodeVisitor visitor, Object data) {
		return visitor.visit(this, data);
	}

	public Object traverse(PatternNodeVisitor visitor, Object data) {
		Object ret = accept(visitor, data);
		if (patterns != null) {
			for (TypeVariablePattern pattern : patterns) {
				pattern.traverse(visitor, ret);
			}
		}
		return ret;
	}

}