/* *******************************************************************
 * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
 * All rights reserved. 
 * This program and the accompanying materials are made available 
 * under the terms of the Eclipse Public License v1.0 
 * which accompanies this distribution and is available at 
 * http://www.eclipse.org/legal/epl-v10.html 
 *  
 * Contributors: 
 *     PARC     initial implementation 
 * ******************************************************************/

package org.aspectj.weaver;

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

import org.aspectj.bridge.IMessage;
import org.aspectj.bridge.ISourceLocation;

public class NewConstructorTypeMunger extends ResolvedTypeMunger {
	private ResolvedMember syntheticConstructor;
	private ResolvedMember explicitConstructor;

	public NewConstructorTypeMunger(ResolvedMember signature, ResolvedMember syntheticConstructor,
			ResolvedMember explicitConstructor, Set superMethodsCalled, List typeVariableAliases) {
		super(Constructor, signature);
		this.syntheticConstructor = syntheticConstructor;
		this.typeVariableAliases = typeVariableAliases;
		this.explicitConstructor = explicitConstructor;
		this.setSuperMethodsCalled(superMethodsCalled);

	}

	public boolean equals(Object other) {
		if (!(other instanceof NewConstructorTypeMunger)) {
			return false;
		}
		NewConstructorTypeMunger o = (NewConstructorTypeMunger) other;
		return ((syntheticConstructor == null) ? (o.syntheticConstructor == null) : syntheticConstructor
				.equals(o.syntheticConstructor))
				& ((explicitConstructor == null) ? (o.explicitConstructor == null) : explicitConstructor
						.equals(o.explicitConstructor));
	}

	// pr262218 - equivalence ignores the explicit constructor since that won't have yet been set for an EclipseTypeMunger
	public boolean equivalentTo(Object other) {
		if (!(other instanceof NewConstructorTypeMunger)) {
			return false;
		}
		NewConstructorTypeMunger o = (NewConstructorTypeMunger) other;
		return ((syntheticConstructor == null) ? (o.syntheticConstructor == null) : syntheticConstructor
				.equals(o.syntheticConstructor));
	}

	private volatile int hashCode = 0;

	public int hashCode() {
		if (hashCode == 0) {
			int result = 17;
			result = 37 * result + ((syntheticConstructor == null) ? 0 : syntheticConstructor.hashCode());
			result = 37 * result + ((explicitConstructor == null) ? 0 : explicitConstructor.hashCode());
			hashCode = result;
		}
		return hashCode;
	}

	// doesnt seem required....
	// public ResolvedMember getDispatchMethod(UnresolvedType aspectType) {
	// return AjcMemberMaker.interMethodBody(signature, aspectType);
	// }

	public void write(CompressingDataOutputStream s) throws IOException {
		kind.write(s);
		signature.write(s);
		syntheticConstructor.write(s);
		explicitConstructor.write(s);
		writeSuperMethodsCalled(s);
		writeSourceLocation(s);
		writeOutTypeAliases(s);
	}

	public static ResolvedTypeMunger readConstructor(VersionedDataInputStream s, ISourceContext context) throws IOException {
		ISourceLocation sloc = null;
		ResolvedMember sig = ResolvedMemberImpl.readResolvedMember(s, context);
		ResolvedMember syntheticCtor = ResolvedMemberImpl.readResolvedMember(s, context);
		ResolvedMember explicitCtor = ResolvedMemberImpl.readResolvedMember(s, context);
		Set superMethodsCalled = readSuperMethodsCalled(s);
		sloc = readSourceLocation(s);
		List typeVarAliases = readInTypeAliases(s);
		ResolvedTypeMunger munger = new NewConstructorTypeMunger(sig, syntheticCtor, explicitCtor, superMethodsCalled,
				typeVarAliases);
		if (sloc != null) {
			munger.setSourceLocation(sloc);
		}
		return munger;
	}

	public ResolvedMember getExplicitConstructor() {
		return explicitConstructor;
	}

	public ResolvedMember getSyntheticConstructor() {
		return syntheticConstructor;
	}

	public void setExplicitConstructor(ResolvedMember explicitConstructor) {
		this.explicitConstructor = explicitConstructor;
		// reset hashCode so that its recalculated with new value
		hashCode = 0;
	}

	public ResolvedMember getMatchingSyntheticMember(Member member, ResolvedType aspectType) {
		ResolvedMember ret = getSyntheticConstructor();
		if (ResolvedType.matches(ret, member)) {
			return getSignature();
		}
		return super.getMatchingSyntheticMember(member, aspectType);
	}

	public void check(World world) {
		if (getSignature().getDeclaringType().resolve(world).isAspect()) {
			world.showMessage(IMessage.ERROR, WeaverMessages.format(WeaverMessages.ITD_CONS_ON_ASPECT), getSignature()
					.getSourceLocation(), null);
		}
	}

	/**
	 * see ResolvedTypeMunger.parameterizedFor(ResolvedType)
	 */
	public ResolvedTypeMunger parameterizedFor(ResolvedType target) {
		ResolvedType genericType = target;
		if (target.isRawType() || target.isParameterizedType()) {
			genericType = genericType.getGenericType();
		}
		ResolvedMember parameterizedSignature = null;
		// If we are parameterizing it for a generic type, we just need to 'swap the letters' from the ones used
		// in the original ITD declaration to the ones used in the actual target type declaration.
		if (target.isGenericType()) {
			TypeVariable vars[] = target.getTypeVariables();
			UnresolvedTypeVariableReferenceType[] varRefs = new UnresolvedTypeVariableReferenceType[vars.length];
			for (int i = 0; i < vars.length; i++) {
				varRefs[i] = new UnresolvedTypeVariableReferenceType(vars[i]);
			}
			parameterizedSignature = getSignature().parameterizedWith(varRefs, genericType, true, typeVariableAliases);
		} else {
			// For raw and 'normal' parameterized targets (e.g. Interface, Interface<String>)
			parameterizedSignature = getSignature().parameterizedWith(target.getTypeParameters(), genericType,
					target.isParameterizedType(), typeVariableAliases);
		}
		NewConstructorTypeMunger nctm = new NewConstructorTypeMunger(parameterizedSignature, syntheticConstructor,
				explicitConstructor, getSuperMethodsCalled(), typeVariableAliases);
		nctm.setSourceLocation(getSourceLocation());
		return nctm;
	}

}
