/*******************************************************************************
 * 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.jdt.internal.corext.refactoring.typeconstraints;

import org.eclipse.core.runtime.Assert;

import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.dom.Assignment;
import org.eclipse.jdt.core.dom.ConditionalExpression;
import org.eclipse.jdt.core.dom.Expression;
import org.eclipse.jdt.core.dom.FieldAccess;
import org.eclipse.jdt.core.dom.IBinding;
import org.eclipse.jdt.core.dom.MethodInvocation;
import org.eclipse.jdt.core.dom.Name;
import org.eclipse.jdt.core.dom.ParenthesizedExpression;
import org.eclipse.jdt.core.dom.SuperFieldAccess;
import org.eclipse.jdt.core.dom.SuperMethodInvocation;

public final class ExpressionVariable extends ConstraintVariable {

	private final CompilationUnitRange fRange;
	private final String fSource;
	private final IBinding fExpressionBinding;
	private final int fExpressionType;

	public ExpressionVariable(Expression expression){
		super(expression.resolveTypeBinding());
		fSource= expression.toString();
		ICompilationUnit cu= ASTCreator.getCu(expression);
		Assert.isNotNull(cu);
		fRange= new CompilationUnitRange(cu, expression);
		fExpressionBinding= resolveBinding(expression);
		fExpressionType= expression.getNodeType();
	}

	/* (non-Javadoc)
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		return "[" + fSource + "]"; //$NON-NLS-1$ //$NON-NLS-2$
	}

	public CompilationUnitRange getCompilationUnitRange() {
		return fRange;
	}

	public int getExpressionType() {
		return fExpressionType;
	}

	public IBinding getExpressionBinding() {
		return fExpressionBinding;
	}

	public static IBinding resolveBinding(Expression expression){
		if (expression instanceof Name)
			return ((Name)expression).resolveBinding();
		if (expression instanceof ParenthesizedExpression)
			return resolveBinding(((ParenthesizedExpression)expression).getExpression());
		else if (expression instanceof Assignment)
			return resolveBinding(((Assignment)expression).getLeftHandSide());//TODO ???
		else if (expression instanceof MethodInvocation)
			return ((MethodInvocation)expression).resolveMethodBinding();
		else if (expression instanceof SuperMethodInvocation)
			return ((SuperMethodInvocation)expression).resolveMethodBinding();
		else if (expression instanceof FieldAccess)
			return ((FieldAccess)expression).resolveFieldBinding();
		else if (expression instanceof SuperFieldAccess)
			return ((SuperFieldAccess)expression).resolveFieldBinding();
		else if (expression instanceof ConditionalExpression)
			return resolveBinding(((ConditionalExpression)expression).getThenExpression());
		return null;
	}

}
