net.sourceforge.phpeclipse.ui/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 import net.sourceforge.phpdt.core.IJavaElement;
  14 import net.sourceforge.phpdt.core.JavaModelException;
  15 import net.sourceforge.phpdt.internal.ui.actions.SelectionConverter;
  16 import net.sourceforge.phpeclipse.phpeditor.PHPEditor;
  17
  18 import org.eclipse.jface.text.IRegion;
  19 import org.eclipse.jface.text.ITextViewer;
  20 import org.eclipse.jface.text.Region;
  21 import org.eclipse.jface.text.information.IInformationProvider;
  22 import org.eclipse.jface.text.information.IInformationProviderExtension;
  23 import org.eclipse.jface.viewers.IStructuredSelection;
  24 import org.eclipse.ui.IEditorPart;
  25
  26 /**
  27  * Provides a Java element to be displayed in by an information presenter.
  28  */
  29 public class JavaElementProvider implements IInformationProvider,
  30                 IInformationProviderExtension {
  31
  32         private PHPEditor fEditor;
  33
  34         private boolean fUseCodeResolve;
  35
  36         public JavaElementProvider(IEditorPart editor) {
  37                 fUseCodeResolve = false;
  38                 if (editor instanceof PHPEditor)
  39                         fEditor = (PHPEditor) editor;
  40         }
  41
  42         public JavaElementProvider(IEditorPart editor, boolean useCodeResolve) {
  43                 this(editor);
  44                 fUseCodeResolve = useCodeResolve;
  45         }
  46
  47         /*
  48          * @see IInformationProvider#getSubject(ITextViewer, int)
  49          */
  50         public IRegion getSubject(ITextViewer textViewer, int offset) {
  51                 if (textViewer != null && fEditor != null) {
  52                         IRegion region = JavaWordFinder.findWord(textViewer.getDocument(),
  53                                         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
  79                                                 .getStructuredSelection(fEditor);
  80                                 if (!sel.isEmpty())
  81                                         return sel.getFirstElement();
  82                         }
  83                         IJavaElement element = SelectionConverter
  84                                         .getElementAtOffset(fEditor);
  85                         if (element != null)
  86                                 return element;
  87                         return SelectionConverter.getInput(fEditor);
  88                 } catch (JavaModelException e) {
  89                         return null;
  90                 }
  91         }
  92 }