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

import java.io.IOException;
import java.lang.reflect.Modifier;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.aspectj.bridge.IMessage;
import org.aspectj.util.FuzzyBoolean;
import org.aspectj.weaver.CompressingDataOutputStream;
import org.aspectj.weaver.ConcreteTypeMunger;
import org.aspectj.weaver.ISourceContext;
import org.aspectj.weaver.Member;
import org.aspectj.weaver.ResolvedMember;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.UnresolvedType;
import org.aspectj.weaver.VersionedDataInputStream;
import org.aspectj.weaver.WeaverMessages;
import org.aspectj.weaver.World;

/**
 * @author colyer Matches types that have a certain method / constructor / field Currently only allowed within declare parents and
 *         declare @type
 */
public class HasMemberTypePattern extends TypePattern {

	private SignaturePattern signaturePattern;

	public HasMemberTypePattern(SignaturePattern aSignaturePattern) {
		super(false, false);
		this.signaturePattern = aSignaturePattern;
	}

	@Override
	protected boolean matchesExactly(ResolvedType type) {
		if (signaturePattern.getKind() == Member.FIELD) {
			return hasField(type);
		} else {
			return hasMethod(type);
		}
	}

	public ISignaturePattern getSignaturePattern() {
		return signaturePattern;
	}

	private final static String declareAtPrefix = "ajc$declare_at";

	private boolean hasField(ResolvedType type) {
		// TODO what about ITDs
		World world = type.getWorld();
		for (Iterator iter = type.getFields(); iter.hasNext();) {
			Member field = iter.next();
			if (field.getName().startsWith(declareAtPrefix)) {
				continue;
			}
			if (signaturePattern.matches(field, type.getWorld(), false)) {
				if (field.getDeclaringType().resolve(world) != type) {
					if (Modifier.isPrivate(field.getModifiers())) {
						continue;
					}
				}
				return true;
			}
		}
		return false;
	}

	protected boolean hasMethod(ResolvedType type) {
		// TODO what about ITDs
		World world = type.getWorld();
		for (Iterator iter = type.getMethods(true, true); iter.hasNext();) {
			Member method = iter.next();
			if (method.getName().startsWith(declareAtPrefix)) {
				continue;
			}
			if (signaturePattern.matches(method, type.getWorld(), false)) {
				ResolvedType declaringType = method.getDeclaringType().resolve(world);
				if (declaringType != type) {
					if (Modifier.isPrivate(method.getModifiers())) {
						continue;
					}
				}
				// J9: Object.finalize() is marked Deprecated it seems... triggers unhelpful messages
				if (method.getName().equals("finalize") && declaringType.equals(ResolvedType.OBJECT)
						&& (signaturePattern.getAnnotationPattern() instanceof ExactAnnotationTypePattern)
						&& ((ExactAnnotationTypePattern)signaturePattern.getAnnotationPattern()).getAnnotationType().getSignature().equals("Ljava/lang/Deprecated;")) {
					continue;
				}
				return true;
			}
		}
		// try itds before we give up (this doesnt find annotations - the signature returned may not include them)
		List mungers = type.getInterTypeMungersIncludingSupers();
		for (ConcreteTypeMunger munger : mungers) {
			Member member = munger.getSignature();
			if (signaturePattern.matches(member, type.getWorld(), false)) {
				if (!Modifier.isPublic(member.getModifiers())) {
					continue;
				}
				return true;
			}
		}
		return false;
	}

	@Override
	protected boolean matchesExactly(ResolvedType type, ResolvedType annotatedType) {
		return matchesExactly(type);
	}

	@Override
	protected boolean matchesArray(UnresolvedType type) {
		return true;
	}

	@Override
	public FuzzyBoolean matchesInstanceof(ResolvedType type) {
		throw new UnsupportedOperationException("hasmethod/field do not support instanceof matching");
	}

	@Override
	public TypePattern parameterizeWith(Map typeVariableMap, World w) {
		HasMemberTypePattern ret = new HasMemberTypePattern(signaturePattern.parameterizeWith(typeVariableMap, w));
		ret.copyLocationFrom(this);
		return ret;
	}

	@Override
	public TypePattern resolveBindings(IScope scope, Bindings bindings, boolean allowBinding, boolean requireExactType) {
		// check that hasmember type patterns are allowed!
		if (!scope.getWorld().isHasMemberSupportEnabled()) {
			String msg = WeaverMessages.format(WeaverMessages.HAS_MEMBER_NOT_ENABLED, this.toString());
			scope.message(IMessage.ERROR, this, msg);
		}
		signaturePattern.resolveBindings(scope, bindings);
		return this;
	}

	@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof HasMemberTypePattern)) {
			return false;
		}
		if (this == obj) {
			return true;
		}
		return signaturePattern.equals(((HasMemberTypePattern) obj).signaturePattern);
	}

	@Override
	public int hashCode() {
		return signaturePattern.hashCode();
	}

	@Override
	public String toString() {
		StringBuilder buff = new StringBuilder();
		if (signaturePattern.getKind() == Member.FIELD) {
			buff.append("hasfield(");
		} else {
			buff.append("hasmethod(");
		}
		buff.append(signaturePattern.toString());
		buff.append(")");
		return buff.toString();
	}

	@Override
	public void write(CompressingDataOutputStream s) throws IOException {
		s.writeByte(TypePattern.HAS_MEMBER);
		signaturePattern.write(s);
		writeLocation(s);
	}

	public static TypePattern read(VersionedDataInputStream s, ISourceContext context) throws IOException {
		SignaturePattern sp = SignaturePattern.read(s, context);
		HasMemberTypePattern ret = new HasMemberTypePattern(sp);
		ret.readLocation(context, s);
		return ret;
	}

	@Override
	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 (this.signaturePattern != null)
			this.signaturePattern.traverse(visitor, ret);
		return ret;
	}
}