/* *******************************************************************
 * 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 v1.0 
 * which accompanies this distribution and is available at 
 * http://eclipse.org/legal/epl-v10.html
 * ******************************************************************/
package org.aspectj.weaver;

/**
 * @author Adrian Colyer
 * @author Andy Clement
 */
public class UnresolvedTypeVariableReferenceType extends UnresolvedType implements TypeVariableReference {

	private TypeVariable typeVariable;

	// constructor used as place-holder when dealing with circular refs such as Enum
	public UnresolvedTypeVariableReferenceType() {
		super("Ljava/lang/Object;");
	}

	public UnresolvedTypeVariableReferenceType(TypeVariable aTypeVariable) {
		super("T" + aTypeVariable.getName() + ";", aTypeVariable.getFirstBound().getErasureSignature());//aTypeVariable.getFirstBound().getSignature());
		this.typeVariable = aTypeVariable;
	}

	// only used when resolving circular refs...
	public void setTypeVariable(TypeVariable aTypeVariable) {
		this.signature = "T" + aTypeVariable.getName() + ";"; // aTypeVariable.getUpperBound().getSignature();
		this.signatureErasure = aTypeVariable.getFirstBound().getErasureSignature();
		this.typeVariable = aTypeVariable;
		this.typeKind = TypeKind.TYPE_VARIABLE;
	}

	@Override
	public ResolvedType resolve(World world) {
		TypeVariableDeclaringElement typeVariableScope = world.getTypeVariableLookupScope();
		TypeVariable resolvedTypeVariable = null;
		TypeVariableReferenceType tvrt = null;
		if (typeVariableScope == null) {
			// throw new BCException("There is no scope in which to lookup type variables!");
			// FIXME asc correct thing to do is go bang, but to limp along, lets cope with the scope missing
			resolvedTypeVariable = typeVariable.resolve(world);
			tvrt = new TypeVariableReferenceType(resolvedTypeVariable, world);
		} else {
			boolean foundOK = false;
			resolvedTypeVariable = typeVariableScope.getTypeVariableNamed(typeVariable.getName());
			// FIXME asc remove this when the shared type var stuff is sorted
			if (resolvedTypeVariable == null) {
				resolvedTypeVariable = typeVariable.resolve(world);
			} else {
				foundOK = true;
			}
			tvrt = new TypeVariableReferenceType(resolvedTypeVariable, world);
		}

		return tvrt;
	}

	@Override
	public boolean isTypeVariableReference() {
		return true;
	}

	public TypeVariable getTypeVariable() {
		return typeVariable;
	}

	@Override
	public String toString() {
		if (typeVariable == null) {
			return "<type variable not set!>";
		} else {
			return "T" + typeVariable.getName() + ";";
		}
	}

	@Override
	public String toDebugString() {
		return typeVariable.getName();
	}

	@Override
	public String getErasureSignature() {
		return typeVariable.getFirstBound().getSignature();
	}

}