| /******************************************************************************* |
| * Copyright (c) 2000, 2005 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.code; |
| |
| import org.eclipse.jdt.core.dom.ASTNode; |
| import org.eclipse.jdt.core.dom.ASTVisitor; |
| import org.eclipse.jdt.core.dom.Assignment; |
| import org.eclipse.jdt.core.dom.IVariableBinding; |
| import org.eclipse.jdt.core.dom.Name; |
| import org.eclipse.jdt.core.dom.PostfixExpression; |
| import org.eclipse.jdt.core.dom.PrefixExpression; |
| import org.eclipse.jdt.core.dom.SimpleName; |
| import org.eclipse.jdt.core.dom.VariableDeclaration; |
| import org.eclipse.jdt.core.dom.PrefixExpression.Operator; |
| |
| public class TempAssignmentFinder extends ASTVisitor{ |
| private ASTNode fFirstAssignment; |
| private IVariableBinding fTempBinding; |
| |
| TempAssignmentFinder(VariableDeclaration tempDeclaration){ |
| fTempBinding= tempDeclaration.resolveBinding(); |
| } |
| |
| private boolean isNameReferenceToTemp(Name name){ |
| return fTempBinding == name.resolveBinding(); |
| } |
| |
| private boolean isAssignmentToTemp(Assignment assignment){ |
| if (fTempBinding == null) |
| return false; |
| |
| if (! (assignment.getLeftHandSide() instanceof Name)) |
| return false; |
| Name ref= (Name)assignment.getLeftHandSide(); |
| return isNameReferenceToTemp(ref); |
| } |
| |
| boolean hasAssignments(){ |
| return fFirstAssignment != null; |
| } |
| |
| ASTNode getFirstAssignment(){ |
| return fFirstAssignment; |
| } |
| |
| //-- visit methods |
| |
| public boolean visit(Assignment assignment) { |
| if (! isAssignmentToTemp(assignment)) |
| return true; |
| |
| fFirstAssignment= assignment; |
| return false; |
| } |
| |
| public boolean visit(PostfixExpression postfixExpression) { |
| if (postfixExpression.getOperand() == null) |
| return true; |
| if (! (postfixExpression.getOperand() instanceof SimpleName)) |
| return true; |
| SimpleName simpleName= (SimpleName)postfixExpression.getOperand(); |
| if (! isNameReferenceToTemp(simpleName)) |
| return true; |
| |
| fFirstAssignment= postfixExpression; |
| return false; |
| } |
| |
| public boolean visit(PrefixExpression prefixExpression) { |
| if (prefixExpression.getOperand() == null) |
| return true; |
| if (! (prefixExpression.getOperand() instanceof SimpleName)) |
| return true; |
| if (! prefixExpression.getOperator().equals(Operator.DECREMENT) && |
| ! prefixExpression.getOperator().equals(Operator.INCREMENT)) |
| return true; |
| SimpleName simpleName= (SimpleName)prefixExpression.getOperand(); |
| if (! isNameReferenceToTemp(simpleName)) |
| return true; |
| |
| fFirstAssignment= prefixExpression; |
| return false; |
| } |
| } |