case-study/jdt-after/core refactoring/org/eclipse/jdt/internal/corext/refactoring/code/ExceptionAnalyzer.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2011 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package org.eclipse.jdt.internal.corext.refactoring.code;
  12
  13 import java.util.List;
  14
  15 import org.eclipse.jdt.core.dom.ASTNode;
  16 import org.eclipse.jdt.core.dom.ClassInstanceCreation;
  17 import org.eclipse.jdt.core.dom.IMethodBinding;
  18 import org.eclipse.jdt.core.dom.ITypeBinding;
  19 import org.eclipse.jdt.core.dom.MethodInvocation;
  20 import org.eclipse.jdt.core.dom.SuperMethodInvocation;
  21 import org.eclipse.jdt.core.dom.ThrowStatement;
  22
  23 import org.eclipse.jdt.internal.corext.refactoring.util.AbstractExceptionAnalyzer;
  24
  25 /* package */ class ExceptionAnalyzer extends AbstractExceptionAnalyzer {
  26
  27         public static ITypeBinding[] perform(ASTNode[] statements) {
  28                 ExceptionAnalyzer analyzer= new ExceptionAnalyzer();
  29                 for (int i= 0; i < statements.length; i++) {
  30                         statements[i].accept(analyzer);
  31                 }
  32                 List<ITypeBinding> exceptions= analyzer.getCurrentExceptions();
  33                 return exceptions.toArray(new ITypeBinding[exceptions.size()]);
  34         }
  35
  36         @Override
  37         public boolean visit(ThrowStatement node) {
  38                 ITypeBinding exception= node.getExpression().resolveTypeBinding();
  39                 if (exception == null)          // Safety net for null bindings when compiling fails.
  40                         return true;
  41
  42                 addException(exception);
  43                 return true;
  44         }
  45
  46         @Override
  47         public boolean visit(MethodInvocation node) {
  48                 return handleExceptions((IMethodBinding)node.getName().resolveBinding());
  49         }
  50
  51         @Override
  52         public boolean visit(SuperMethodInvocation node) {
  53                 return handleExceptions((IMethodBinding)node.getName().resolveBinding());
  54         }
  55
  56         @Override
  57         public boolean visit(ClassInstanceCreation node) {
  58                 return handleExceptions(node.resolveConstructorBinding());
  59         }
  60
  61         private boolean handleExceptions(IMethodBinding binding) {
  62                 if (binding == null)
  63                         return true;
  64                 addExceptions(binding.getExceptionTypes());
  65                 return true;
  66         }
  67 }