case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/text/java/hover/JavaInformationProvider.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2012 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.text.java.hover;
  12
  13 import org.eclipse.jface.text.IInformationControlCreator;
  14 import org.eclipse.jface.text.IRegion;
  15 import org.eclipse.jface.text.ITextViewer;
  16 import org.eclipse.jface.text.information.IInformationProvider;
  17 import org.eclipse.jface.text.information.IInformationProviderExtension;
  18 import org.eclipse.jface.text.information.IInformationProviderExtension2;
  19
  20 import org.eclipse.ui.IEditorPart;
  21
  22 import org.eclipse.jdt.internal.ui.text.JavaWordFinder;
  23
  24
  25 public class JavaInformationProvider implements IInformationProvider, IInformationProviderExtension, IInformationProviderExtension2 {
  26
  27         protected BestMatchHover fImplementation;
  28
  29         public JavaInformationProvider(IEditorPart editor) {
  30                 if (editor != null) {
  31                         fImplementation= new BestMatchHover();
  32                         fImplementation.setEditor(editor);
  33                 }
  34         }
  35
  36         /*
  37          * @see IInformationProvider#getSubject(ITextViewer, int)
  38          */
  39         public IRegion getSubject(ITextViewer textViewer, int offset) {
  40
  41                 if (textViewer != null)
  42                         return JavaWordFinder.findWord(textViewer.getDocument(), offset);
  43
  44                 return null;
  45         }
  46
  47         /**
  48          * @see IInformationProvider#getInformation(ITextViewer, IRegion)
  49          * @deprecated
  50          */
  51         public String getInformation(ITextViewer textViewer, IRegion subject) {
  52                 if (fImplementation != null) {
  53                         String s= fImplementation.getHoverInfo(textViewer, subject);
  54                         if (s != null && s.trim().length() > 0) {
  55                                 return s;
  56                         }
  57                 }
  58                 return null;
  59         }
  60
  61         /*
  62          * @see org.eclipse.jface.text.information.IInformationProviderExtension#getInformation2(org.eclipse.jface.text.ITextViewer, org.eclipse.jface.text.IRegion)
  63          */
  64         public Object getInformation2(ITextViewer textViewer, IRegion subject) {
  65                 if (fImplementation == null)
  66                         return null;
  67                 return fImplementation.getHoverInfo2(textViewer, subject, true);
  68         }
  69
  70         /*
  71          * @see IInformationProviderExtension2#getInformationPresenterControlCreator()
  72          * @since 3.1
  73          */
  74         public IInformationControlCreator getInformationPresenterControlCreator() {
  75                 if (fImplementation == null)
  76                         return null;
  77                 return fImplementation.getInformationPresenterControlCreator();
  78         }
  79 }