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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.
 * 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
 *
 * ******************************************************************/
package org.aspectj.weaver.patterns;

import java.io.IOException;
import java.util.List;
import java.util.Map;

import org.aspectj.util.FuzzyBoolean;
import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.IntMap;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.VersionedDataInputStream;
import org.aspectj.weaver.World;

/**
 * @author Adrian Colyer
 */
public class AnnotationPatternList extends PatternNode {

	private AnnotationTypePattern[] typePatterns;
	int ellipsisCount = 0;

	public static final AnnotationPatternList EMPTY = new AnnotationPatternList(AnnotationTypePattern.NONE);

	public static final AnnotationPatternList ANY = new AnnotationPatternList(
			new AnnotationTypePattern[] { AnnotationTypePattern.ELLIPSIS });

	public AnnotationPatternList() {
		typePatterns = AnnotationTypePattern.NONE;
		ellipsisCount = 0;
	}

	public AnnotationPatternList(AnnotationTypePattern[] arguments) {
		this.typePatterns = arguments;
		for (AnnotationTypePattern argument : arguments) {
			if (argument == AnnotationTypePattern.ELLIPSIS) {
				ellipsisCount++;
			}
		}
	}

	public AnnotationPatternList(List l) {
		this(l.toArray(AnnotationTypePattern.NONE));
	}

	protected AnnotationTypePattern[] getAnnotationPatterns() {
		return typePatterns;
	}

	public AnnotationPatternList parameterizeWith(Map typeVariableMap, World w) {
		AnnotationTypePattern[] parameterizedPatterns = new AnnotationTypePattern[this.typePatterns.length];
		for (int i = 0; i < parameterizedPatterns.length; i++) {
			parameterizedPatterns[i] = this.typePatterns[i].parameterizeWith(typeVariableMap, w);
		}
		AnnotationPatternList ret = new AnnotationPatternList(parameterizedPatterns);
		ret.copyLocationFrom(this);
		return ret;
	}

	public void resolve(World inWorld) {
		for (AnnotationTypePattern typePattern : typePatterns) {
			typePattern.resolve(inWorld);
		}
	}

	public FuzzyBoolean matches(ResolvedType[] someArgs) {
		// do some quick length tests first
		int numArgsMatchedByEllipsis = (someArgs.length + ellipsisCount) - typePatterns.length;
		if (numArgsMatchedByEllipsis < 0) {
			return FuzzyBoolean.NO;
		}
		if ((numArgsMatchedByEllipsis > 0) && (ellipsisCount == 0)) {
			return FuzzyBoolean.NO;
		}
		// now work through the args and the patterns, skipping at ellipsis
		FuzzyBoolean ret = FuzzyBoolean.YES;
		int argsIndex = 0;
		for (AnnotationTypePattern typePattern : typePatterns) {
			if (typePattern == AnnotationTypePattern.ELLIPSIS) {
				// match ellipsisMatchCount args
				argsIndex += numArgsMatchedByEllipsis;
			} else if (typePattern == AnnotationTypePattern.ANY) {
				argsIndex++;
			} else {
				// match the argument type at argsIndex with the ExactAnnotationTypePattern
				// we know it is exact because nothing else is allowed in args
				if (someArgs[argsIndex].isPrimitiveType()) {
					return FuzzyBoolean.NO; // can never match
				}
				ExactAnnotationTypePattern ap = (ExactAnnotationTypePattern) typePattern;
				FuzzyBoolean matches = ap.matchesRuntimeType(someArgs[argsIndex]);
				if (matches == FuzzyBoolean.NO) {
					return FuzzyBoolean.MAYBE; // could still match at runtime
				} else {
					argsIndex++;
					ret = ret.and(matches);
				}
			}
		}
		return ret;
	}

	public int size() {
		return typePatterns.length;
	}

	public AnnotationTypePattern get(int index) {
		return typePatterns[index];
	}

	public AnnotationPatternList resolveBindings(IScope scope, Bindings bindings, boolean allowBinding) {
		for (int i = 0; i < typePatterns.length; i++) {
			AnnotationTypePattern p = typePatterns[i];
			if (p != null) {
				typePatterns[i] = typePatterns[i].resolveBindings(scope, bindings, allowBinding);
			}
		}
		return this;
	}

	public AnnotationPatternList resolveReferences(IntMap bindings) {
		int len = typePatterns.length;
		AnnotationTypePattern[] ret = new AnnotationTypePattern[len];
		for (int i = 0; i < len; i++) {
			ret[i] = typePatterns[i].remapAdviceFormals(bindings);
		}
		return new AnnotationPatternList(ret);
	}

	public String toString() {
		StringBuilder buf = new StringBuilder();
		buf.append("(");
		for (int i = 0, len = typePatterns.length; i < len; i++) {
			AnnotationTypePattern type = typePatterns[i];
			if (i > 0) {
				buf.append(", ");
			}
			if (type == AnnotationTypePattern.ELLIPSIS) {
				buf.append("..");
			} else {
				String annPatt = type.toString();
				buf.append(annPatt.startsWith("@") ? annPatt.substring(1) : annPatt);
			}
		}
		buf.append(")");
		return buf.toString();
	}

	public boolean equals(Object other) {
		if (!(other instanceof AnnotationPatternList)) {
			return false;
		}
		AnnotationPatternList o = (AnnotationPatternList) other;
		int len = o.typePatterns.length;
		if (len != this.typePatterns.length) {
			return false;
		}
		for (int i = 0; i < len; i++) {
			if (!this.typePatterns[i].equals(o.typePatterns[i])) {
				return false;
			}
		}
		return true;
	}

	public int hashCode() {
		int result = 41;
		for (AnnotationTypePattern typePattern : typePatterns) {
			result = 37 * result + typePattern.hashCode();
		}
		return result;
	}

	public static AnnotationPatternList read(VersionedDataInputStream s, ISourceContext context) throws IOException {
		short len = s.readShort();
		AnnotationTypePattern[] arguments = new AnnotationTypePattern[len];
		for (int i = 0; i < len; i++) {
			arguments[i] = AnnotationTypePattern.read(s, context);
		}
		AnnotationPatternList ret = new AnnotationPatternList(arguments);
		ret.readLocation(context, s);
		return ret;
	}

	public void write(CompressingDataOutputStream s) throws IOException {
		s.writeShort(typePatterns.length);
		for (AnnotationTypePattern typePattern : typePatterns) {
			typePattern.write(s);
		}
		writeLocation(s);
	}

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

	public Object traverse(PatternNodeVisitor visitor, Object data) {
		Object ret = accept(visitor, data);
		for (AnnotationTypePattern typePattern : typePatterns) {
			typePattern.traverse(visitor, ret);
		}
		return ret;
	}

}