/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints2;

import org.eclipse.core.runtime.Assert;
import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
import org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.CompilationUnitRange;
import org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints.types.TType;

/**
 * A TypeVariable is a ConstraintVariable which stands for a
 * single type reference (in source).
 */
public final class TypeVariable2 extends ConstraintVariable2 implements ITypeConstraintVariable {

	private final CompilationUnitRange fRange;

	public TypeVariable2(TType type, CompilationUnitRange range) {
		super(type);
		Assert.isNotNull(range);
		fRange= range;
	}
	
	public CompilationUnitRange getRange() {
		return fRange;
	}
	
	/*
	 * @see java.lang.Object#hashCode()
	 */
	public int hashCode() {
		return getRange().hashCode() ^ getType().hashCode();
	}
	
	/*
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	public boolean equals(Object other) {
		//TODO: unique per construction?  //return this == other;
		if (this == other)
			return true;
		if (other.getClass() != TypeVariable2.class)
			return false;
		
		TypeVariable2 otherTypeVariable= (TypeVariable2) other;
		return getRange().equals(otherTypeVariable.getRange())
				&& getType() == otherTypeVariable.getType();
	}

	public void setCompilationUnit(IJavaScriptUnit unit) {
		throw new UnsupportedOperationException();
	}

	public IJavaScriptUnit getCompilationUnit() {
		return fRange.getCompilationUnit();
	}
	
	public String toString() {
		return super.toString() + " [" + fRange.getSourceRange().getOffset() + '+' + fRange.getSourceRange().getLength() + ']'; //$NON-NLS-1$
	}
}