Case Study: adding data and statistics

[ifi-stolz-refaktor.git] / case-study / jdt-before / ui / org / eclipse / jdt / internal / ui / javaeditor / selectionactions / StructureSelectPreviousAction.java

diff --git a/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/javaeditor/selectionactions/StructureSelectPreviousAction.java b/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/javaeditor/selectionactions/StructureSelectPreviousAction.java
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+++ b/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/javaeditor/selectionactions/StructureSelectPreviousAction.java
@@ -0,0 +1,107 @@
+/*******************************************************************************
+ * 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.ui.javaeditor.selectionactions;
+
+import org.eclipse.ui.PlatformUI;
+
+import org.eclipse.jdt.core.ISourceRange;
+import org.eclipse.jdt.core.ISourceReference;
+import org.eclipse.jdt.core.JavaModelException;
+import org.eclipse.jdt.core.dom.ASTNode;
+
+import org.eclipse.jdt.internal.corext.dom.GenericVisitor;
+import org.eclipse.jdt.internal.corext.dom.SelectionAnalyzer;
+
+import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
+import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor;
+
+public class StructureSelectPreviousAction extends StructureSelectionAction {
+
+       private static class PreviousNodeAnalyzer extends GenericVisitor {
+               private final int fOffset;
+               private ASTNode fPreviousNode;
+               private PreviousNodeAnalyzer(int offset) {
+                       super(true);
+                       fOffset= offset;
+               }
+               public static ASTNode perform(int offset, ASTNode lastCoveringNode) {
+                       PreviousNodeAnalyzer analyzer= new PreviousNodeAnalyzer(offset);
+                       lastCoveringNode.accept(analyzer);
+                       return analyzer.fPreviousNode;
+               }
+               @Override
+               protected boolean visitNode(ASTNode node) {
+                       int start= node.getStartPosition();
+                       int end= start + node.getLength();
+                       if (end == fOffset) {
+                               fPreviousNode= node;
+                               return true;
+                       } else {
+                               return (start < fOffset && fOffset < end);
+                       }
+               }
+       }
+
+       public StructureSelectPreviousAction(JavaEditor editor, SelectionHistory history) {
+               super(SelectionActionMessages.StructureSelectPrevious_label, editor, history);
+               setToolTipText(SelectionActionMessages.StructureSelectPrevious_tooltip);
+               setDescription(SelectionActionMessages.StructureSelectPrevious_description);
+               PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.STRUCTURED_SELECT_PREVIOUS_ACTION);
+       }
+
+       /*
+        * This constructor is for testing purpose only.
+        */
+       public StructureSelectPreviousAction() {
+       }
+
+       /* non java doc
+        * @see StructureSelectionAction#internalGetNewSelectionRange(ISourceRange, ICompilationUnit, SelectionAnalyzer)
+        */
+       @Override
+       ISourceRange internalGetNewSelectionRange(ISourceRange oldSourceRange, ISourceReference sr, SelectionAnalyzer selAnalyzer) throws JavaModelException{
+               if (oldSourceRange.getLength() == 0 && selAnalyzer.getLastCoveringNode() != null) {
+                       ASTNode previousNode= PreviousNodeAnalyzer.perform(oldSourceRange.getOffset(), selAnalyzer.getLastCoveringNode());
+                       if (previousNode != null)
+                               return getSelectedNodeSourceRange(sr, previousNode);
+               }
+               ASTNode first= selAnalyzer.getFirstSelectedNode();
+               if (first == null)
+                       return getLastCoveringNodeRange(oldSourceRange, sr, selAnalyzer);
+
+               ASTNode parent= first.getParent();
+               if (parent == null)
+                       return getLastCoveringNodeRange(oldSourceRange, sr, selAnalyzer);
+
+               ASTNode previousNode= getPreviousNode(parent, selAnalyzer.getSelectedNodes()[0]);
+               if (previousNode == parent)
+                       return getSelectedNodeSourceRange(sr, parent);
+
+               int offset= previousNode.getStartPosition();
+               int end= oldSourceRange.getOffset() + oldSourceRange.getLength() - 1;
+               return StructureSelectionAction.createSourceRange(offset, end);
+       }
+
+       private static ASTNode getPreviousNode(ASTNode parent, ASTNode node){
+               ASTNode[] siblingNodes= StructureSelectionAction.getSiblingNodes(node);
+               if (siblingNodes == null || siblingNodes.length == 0)
+                       return parent;
+               if (node == siblingNodes[0]) {
+                       return parent;
+               } else {
+                       int index= StructureSelectionAction.findIndex(siblingNodes, node);
+                       if (index < 1)
+                               return parent;
+                       return siblingNodes[index - 1];
+               }
+       }
+}
+