case-study/jdt-after/ui/org/eclipse/jdt/internal/ui/javaeditor/ClassFileEditorInputFactory.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2009 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.ui.javaeditor;
  12
  13
  14 import org.eclipse.core.runtime.IAdaptable;
  15
  16 import org.eclipse.ui.IElementFactory;
  17 import org.eclipse.ui.IMemento;
  18
  19 import org.eclipse.jdt.core.IClassFile;
  20 import org.eclipse.jdt.core.IJavaElement;
  21 import org.eclipse.jdt.core.IJavaProject;
  22 import org.eclipse.jdt.core.IType;
  23 import org.eclipse.jdt.core.JavaCore;
  24 import org.eclipse.jdt.core.JavaModelException;
  25
  26 /**
  27  * The factory which is capable of recreating class file editor
  28  * inputs stored in a memento.
  29  */
  30 public class ClassFileEditorInputFactory implements IElementFactory {
  31
  32         public final static String ID=  "org.eclipse.jdt.ui.ClassFileEditorInputFactory"; //$NON-NLS-1$
  33         public final static String KEY= "org.eclipse.jdt.ui.ClassFileIdentifier"; //$NON-NLS-1$
  34
  35         public ClassFileEditorInputFactory() {
  36         }
  37
  38         /*
  39          * @see org.eclipse.ui.IElementFactory#createElement(org.eclipse.ui.IMemento)
  40          */
  41         public IAdaptable createElement(IMemento memento) {
  42                 String identifier= memento.getString(KEY);
  43                 if (identifier == null)
  44                         return null;
  45
  46                 IJavaElement element= JavaCore.create(identifier);
  47                 try {
  48                         if (!element.exists() && element instanceof IClassFile) {
  49                                 /*
  50                                  * Let's try to find the class file,
  51                                  * see https://bugs.eclipse.org/bugs/show_bug.cgi?id=83221
  52                                  */
  53                                 IClassFile cf= (IClassFile)element;
  54                                 IType type= cf.getType();
  55                                 IJavaProject project= element.getJavaProject();
  56                                 if (project != null) {
  57                                         type= project.findType(type.getFullyQualifiedName());
  58                                         if (type == null)
  59                                                 return null;
  60                                         element= type.getParent();
  61                                 }
  62                         }
  63                         return EditorUtility.getEditorInput(element);
  64                 } catch (JavaModelException x) {
  65                         // Don't report but simply return null
  66                         return null;
  67                 }
  68         }
  69
  70         public static void saveState(IMemento memento, InternalClassFileEditorInput input) {
  71                 IClassFile c= input.getClassFile();
  72                 memento.putString(KEY, c.getHandleIdentifier());
  73         }
  74 }