Case Study: adding data and statistics

[ifi-stolz-refaktor.git] / case-study / jdt-after / core refactoring / org / eclipse / jdt / internal / corext / refactoring / rename / TempDeclarationFinder.java

diff --git a/case-study/jdt-after/core refactoring/org/eclipse/jdt/internal/corext/refactoring/rename/TempDeclarationFinder.java b/case-study/jdt-after/core refactoring/org/eclipse/jdt/internal/corext/refactoring/rename/TempDeclarationFinder.java
new file mode 100644 (file)
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--- /dev/null
+++ b/case-study/jdt-after/core refactoring/org/eclipse/jdt/internal/corext/refactoring/rename/TempDeclarationFinder.java
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+/*******************************************************************************
+ * 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();
+               }
+       }
+
+}