| /******************************************************************************* |
| * Copyright (c) 2000, 2011 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.rename; |
| |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.Region; |
| |
| import org.eclipse.jdt.core.dom.ASTNode; |
| import org.eclipse.jdt.core.dom.CompilationUnit; |
| import org.eclipse.jdt.core.dom.IBinding; |
| import org.eclipse.jdt.core.dom.Name; |
| import org.eclipse.jdt.core.dom.SimpleName; |
| import org.eclipse.jdt.core.dom.VariableDeclaration; |
| import org.eclipse.jdt.core.dom.VariableDeclarationStatement; |
| |
| import org.eclipse.jdt.internal.corext.dom.Selection; |
| import org.eclipse.jdt.internal.corext.dom.SelectionAnalyzer; |
| |
| public class TempDeclarationFinder { |
| |
| //no instances |
| private TempDeclarationFinder(){} |
| |
| /** |
| * @return <code>null</code> if the selection is invalid or does not cover a temp |
| * declaration or reference. |
| */ |
| public static VariableDeclaration findTempDeclaration(CompilationUnit cu, int selectionOffset, int selectionLength) { |
| TempSelectionAnalyzer analyzer= new TempSelectionAnalyzer(selectionOffset, selectionLength); |
| cu.accept(analyzer); |
| |
| ASTNode[] selected= analyzer.getSelectedNodes(); |
| if (selected == null || selected.length != 1) |
| return null; |
| |
| ASTNode selectedNode= selected[0]; |
| if (selectedNode instanceof VariableDeclaration) |
| return (VariableDeclaration)selectedNode; |
| |
| if (selectedNode instanceof Name){ |
| Name reference= (Name)selectedNode; |
| IBinding binding= reference.resolveBinding(); |
| if (binding == null) |
| return null; |
| ASTNode declaringNode= cu.findDeclaringNode(binding); |
| if (declaringNode instanceof VariableDeclaration) |
| return (VariableDeclaration)declaringNode; |
| else |
| return null; |
| } else if (selectedNode instanceof VariableDeclarationStatement){ |
| VariableDeclarationStatement vds= (VariableDeclarationStatement)selectedNode; |
| if (vds.fragments().size() != 1) |
| return null; |
| return (VariableDeclaration)vds.fragments().get(0); |
| } |
| return null; |
| } |
| |
| /* |
| * Class used to extract selected nodes from an AST. |
| * Subclassing <code>SelectionAnalyzer</code> is needed to support activation |
| * when only a part of the <code>VariableDeclaration</code> node is selected |
| */ |
| private static class TempSelectionAnalyzer extends SelectionAnalyzer { |
| |
| private ASTNode fNode; |
| |
| TempSelectionAnalyzer(int selectionOffset, int selectionLength){ |
| super(Selection.createFromStartLength(selectionOffset, selectionLength), true); |
| } |
| |
| //overridden |
| @Override |
| public boolean visitNode(ASTNode node) { |
| if (node instanceof VariableDeclaration) |
| return visitVariableDeclaration((VariableDeclaration)node); |
| else if (node instanceof SimpleName) |
| return visitSimpleName((SimpleName)node); |
| else |
| return super.visitNode(node); |
| } |
| |
| private boolean addNodeAndStop(ASTNode node){ |
| fNode= node; |
| return false; |
| } |
| |
| private boolean visitSimpleName(SimpleName name) { |
| if (getSelection().coveredBy(name)) |
| return addNodeAndStop(name); |
| return super.visitNode(name); |
| } |
| |
| private boolean visitVariableDeclaration(VariableDeclaration vd) { |
| if (vd.getInitializer() != null){ |
| int start= vd.getStartPosition(); |
| IRegion declarationRange= new Region(start, vd.getInitializer().getStartPosition() - start); |
| if (getSelection().coveredBy(declarationRange)) |
| return addNodeAndStop(vd); |
| else |
| return super.visitNode(vd); |
| } else { |
| if (getSelection().coveredBy(vd)) |
| return addNodeAndStop(vd); |
| else |
| return super.visitNode(vd); |
| } |
| } |
| |
| //overridden |
| @Override |
| public ASTNode[] getSelectedNodes() { |
| if (fNode != null) |
| return new ASTNode[] { fNode }; |
| return super.getSelectedNodes(); |
| } |
| } |
| |
| } |