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   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.java.hover;
  12
  13 import java.util.ArrayList;
  14 import java.util.Iterator;
  15 import java.util.List;
  16
  17 import net.sourceforge.phpdt.ui.PreferenceConstants;
  18 import net.sourceforge.phpdt.ui.text.java.hover.IJavaEditorTextHover;
  19 import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  20
  21 import org.eclipse.jface.text.IInformationControlCreator;
  22 import org.eclipse.jface.text.IRegion;
  23 import org.eclipse.jface.text.ITextHover;
  24 import org.eclipse.jface.text.ITextHoverExtension;
  25 import org.eclipse.jface.text.ITextViewer;
  26 import org.eclipse.jface.text.information.IInformationProviderExtension2;
  27 import org.eclipse.ui.IEditorPart;
  28
  29 /**
  30  * Caution: this implementation is a layer breaker and contains some "shortcuts"
  31  */
  32 public class BestMatchHover extends AbstractJavaEditorTextHover implements
  33                 ITextHoverExtension, IInformationProviderExtension2 {
  34
  35         private List fTextHoverSpecifications;
  36
  37         private List fInstantiatedTextHovers;
  38
  39         private ITextHover fBestHover;
  40
  41         public BestMatchHover() {
  42                 installTextHovers();
  43         }
  44
  45         public BestMatchHover(IEditorPart editor) {
  46                 this();
  47                 setEditor(editor);
  48         }
  49
  50         /**
  51          * Installs all text hovers.
  52          */
  53         private void installTextHovers() {
  54
  55                 // initialize lists - indicates that the initialization happened
  56                 fTextHoverSpecifications = new ArrayList(2);
  57                 fInstantiatedTextHovers = new ArrayList(2);
  58
  59                 // populate list
  60                 JavaEditorTextHoverDescriptor[] hoverDescs = PHPeclipsePlugin
  61                                 .getDefault().getJavaEditorTextHoverDescriptors();
  62                 for (int i = 0; i < hoverDescs.length; i++) {
  63                         // ensure that we don't add ourselves to the list
  64                         if (!PreferenceConstants.ID_BESTMATCH_HOVER.equals(hoverDescs[i]
  65                                         .getId()))
  66                                 fTextHoverSpecifications.add(hoverDescs[i]);
  67                 }
  68         }
  69
  70         private void checkTextHovers() {
  71                 if (fTextHoverSpecifications.size() == 0)
  72                         return;
  73
  74                 for (Iterator iterator = new ArrayList(fTextHoverSpecifications)
  75                                 .iterator(); iterator.hasNext();) {
  76                         JavaEditorTextHoverDescriptor spec = (JavaEditorTextHoverDescriptor) iterator
  77                                         .next();
  78
  79                         IJavaEditorTextHover hover = spec.createTextHover();
  80                         if (hover != null) {
  81                                 hover.setEditor(getEditor());
  82                                 addTextHover(hover);
  83                                 fTextHoverSpecifications.remove(spec);
  84                         }
  85                 }
  86         }
  87
  88         protected void addTextHover(ITextHover hover) {
  89                 if (!fInstantiatedTextHovers.contains(hover))
  90                         fInstantiatedTextHovers.add(hover);
  91         }
  92
  93         /*
  94          * @see ITextHover#getHoverInfo(ITextViewer, IRegion)
  95          */
  96         public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
  97
  98                 checkTextHovers();
  99                 fBestHover = null;
 100
 101                 if (fInstantiatedTextHovers == null)
 102                         return null;
 103
 104                 for (Iterator iterator = fInstantiatedTextHovers.iterator(); iterator
 105                                 .hasNext();) {
 106                         ITextHover hover = (ITextHover) iterator.next();
 107
 108                         String s = hover.getHoverInfo(textViewer, hoverRegion);
 109                         if (s != null && s.trim().length() > 0) {
 110                                 fBestHover = hover;
 111                                 return s;
 112                         }
 113                 }
 114
 115                 return null;
 116         }
 117
 118         /*
 119          * @see org.eclipse.jface.text.ITextHoverExtension#getHoverControlCreator()
 120          * @since 3.0
 121          */
 122         public IInformationControlCreator getHoverControlCreator() {
 123                 if (fBestHover instanceof ITextHoverExtension)
 124                         return ((ITextHoverExtension) fBestHover).getHoverControlCreator();
 125
 126                 return null;
 127         }
 128
 129         /*
 130          * @see org.eclipse.jface.text.information.IInformationProviderExtension2#getInformationPresenterControlCreator()
 131          * @since 3.0
 132          */
 133         public IInformationControlCreator getInformationPresenterControlCreator() {
 134                 if (fBestHover instanceof IInformationProviderExtension2)
 135                         return ((IInformationProviderExtension2) fBestHover)
 136                                         .getInformationPresenterControlCreator();
 137
 138                 return null;
 139         }
 140 }