Case Study: adding data and statistics

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

diff --git a/case-study/jdt-after/core refactoring/org/eclipse/jdt/internal/corext/refactoring/util/TightSourceRangeComputer.java b/case-study/jdt-after/core refactoring/org/eclipse/jdt/internal/corext/refactoring/util/TightSourceRangeComputer.java
new file mode 100644 (file)
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+/*******************************************************************************
+ * Copyright (c) 2005, 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.util;
+
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+
+import org.eclipse.text.edits.TextEditGroup;
+
+import org.eclipse.jdt.core.dom.ASTNode;
+import org.eclipse.jdt.core.dom.StructuralPropertyDescriptor;
+import org.eclipse.jdt.core.dom.VariableDeclaration;
+import org.eclipse.jdt.core.dom.VariableDeclarationStatement;
+import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
+import org.eclipse.jdt.core.dom.rewrite.TargetSourceRangeComputer;
+
+/**
+ * A source range computer that uses the shortest possible source range for a given set of nodes.
+ * <p>
+ * For other nodes, the default extended source range from
+ * {@link TargetSourceRangeComputer#computeSourceRange(ASTNode)} is used.
+ * <p>
+ * For nodes inside "tight" nodes, the source range is the extended source range, unless this would
+ * violate the no-overlapping condition from the superclass.
+ * 
+ * @since 3.2
+ */
+public class TightSourceRangeComputer extends TargetSourceRangeComputer {
+       private HashSet<ASTNode> fTightSourceRangeNodes= new HashSet<ASTNode>();
+
+       /**
+        * Add the given node to the set of "tight" nodes.
+        * 
+        * @param reference a node
+        * @since 3.2
+        */
+       public void addTightSourceNode(ASTNode reference) {
+               fTightSourceRangeNodes.add(reference);
+
+           List<StructuralPropertyDescriptor> properties= reference.structuralPropertiesForType();
+           for (Iterator<StructuralPropertyDescriptor> iterator= properties.iterator(); iterator.hasNext();) {
+               StructuralPropertyDescriptor descriptor= iterator.next();
+               if (descriptor.isChildProperty()) {
+                       ASTNode child= (ASTNode)reference.getStructuralProperty(descriptor);
+                       if (child != null && isExtending(child, reference)) {
+                               addTightSourceNode(child);
+                       }
+               } else if (descriptor.isChildListProperty()) {
+                       List<? extends ASTNode> children= (List<? extends ASTNode>) reference.getStructuralProperty(descriptor);
+                       for (Iterator<? extends ASTNode> iterator2= children.iterator(); iterator2.hasNext();) {
+                       ASTNode child= iterator2.next();
+                       if (isExtending(child, reference)) {
+                                       addTightSourceNode(child);
+                               }
+                }
+               }
+        }
+    }
+
+       @Override
+       public SourceRange computeSourceRange(ASTNode node) {
+               if (fTightSourceRangeNodes.contains(node)) {
+                       return new TargetSourceRangeComputer.SourceRange(node.getStartPosition(), node.getLength());
+               } else {
+                       return super.computeSourceRange(node); // see bug 85850
+               }
+       }
+
+       private boolean isExtending(ASTNode child, ASTNode parent) {
+           SourceRange extendedRange= super.computeSourceRange(child);
+
+           int parentStart= parent.getStartPosition();
+               int extendedStart= extendedRange.getStartPosition();
+               if (parentStart > extendedStart)
+                       return true;
+
+               int parentEnd= parentStart + parent.getLength();
+               int extendedEnd= extendedStart + extendedRange.getLength();
+               if (parentEnd < extendedEnd)
+                       return true;
+
+           return false;
+    }
+
+       public void generated_1049388895414195197(VariableDeclaration variableDeclaration, TextEditGroup groupDesc, ASTNode parent, ASTRewrite rewrite) {
+               rewrite.setTargetSourceRangeComputer(this);
+               if (parent instanceof VariableDeclarationStatement && ((VariableDeclarationStatement) parent).fragments().size() == 1) {
+                       addTightSourceNode(parent);
+                       rewrite.remove(parent, groupDesc);
+               } else {
+                       addTightSourceNode(variableDeclaration);
+                       rewrite.remove(variableDeclaration, groupDesc);
+               }
+       }
+}