net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/text/JavaElementProvider.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.text;
  12
  13
  14 import net.sourceforge.phpdt.core.IJavaElement;
  15 import net.sourceforge.phpdt.core.JavaModelException;
  16 import net.sourceforge.phpdt.internal.ui.actions.SelectionConverter;
  17 import net.sourceforge.phpeclipse.phpeditor.PHPEditor;
  18
  19 import org.eclipse.jface.text.IRegion;
  20 import org.eclipse.jface.text.ITextViewer;
  21 import org.eclipse.jface.text.Region;
  22 import org.eclipse.jface.text.information.IInformationProvider;
  23 import org.eclipse.jface.text.information.IInformationProviderExtension;
  24 import org.eclipse.jface.viewers.IStructuredSelection;
  25 import org.eclipse.ui.IEditorPart;
  26
  27
  28
  29 /**
  30  * Provides a Java element to be displayed in by an information presenter.
  31  */
  32 public class JavaElementProvider implements IInformationProvider, IInformationProviderExtension {
  33
  34         private PHPEditor fEditor;
  35         private boolean fUseCodeResolve;
  36
  37         public JavaElementProvider(IEditorPart editor) {
  38                 fUseCodeResolve= false;
  39                 if (editor instanceof PHPEditor)
  40                         fEditor= (PHPEditor)editor;
  41         }
  42
  43         public JavaElementProvider(IEditorPart editor, boolean useCodeResolve) {
  44                 this(editor);
  45                 fUseCodeResolve= useCodeResolve;
  46         }
  47
  48         /*
  49          * @see IInformationProvider#getSubject(ITextViewer, int)
  50          */
  51         public IRegion getSubject(ITextViewer textViewer, int offset) {
  52                 if (textViewer != null && fEditor != null) {
  53                         IRegion region= JavaWordFinder.findWord(textViewer.getDocument(), offset);
  54                         if (region != null)
  55                                 return region;
  56                         else
  57                                 return new Region(offset, 0);
  58                 }
  59                 return null;
  60         }
  61
  62         /*
  63          * @see IInformationProvider#getInformation(ITextViewer, IRegion)
  64          */
  65         public String getInformation(ITextViewer textViewer, IRegion subject) {
  66                 return getInformation2(textViewer, subject).toString();
  67         }
  68
  69         /*
  70          * @see IInformationProviderExtension#getElement(ITextViewer, IRegion)
  71          */
  72         public Object getInformation2(ITextViewer textViewer, IRegion subject) {
  73                 if (fEditor == null)
  74                         return null;
  75
  76                 try {
  77                         if (fUseCodeResolve) {
  78                                 IStructuredSelection sel= SelectionConverter.getStructuredSelection(fEditor);
  79                                 if (!sel.isEmpty())
  80                                         return sel.getFirstElement();
  81                         }
  82                         IJavaElement element= SelectionConverter.getElementAtOffset(fEditor);
  83                         if (element != null)
  84                                 return element;
  85                         return SelectionConverter.getInput(fEditor);
  86                 } catch (JavaModelException e) {
  87                         return null;
  88                 }
  89         }
  90 }