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   1 /*
   2  * Copyright (c) 2003-2004 Christopher Lenz 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  *     Christopher Lenz - initial API and implementation
  10  *
  11  * $Id: XMLAnnotationHover.java,v 1.2 2006-10-21 23:14:13 pombredanne Exp $
  12  */
  13 package net.sourceforge.phpeclipse.xml.ui.internal.text;
  14
  15 import java.util.ArrayList;
  16 import java.util.Iterator;
  17 import java.util.List;
  18
  19 import org.eclipse.jface.text.BadLocationException;
  20 import org.eclipse.jface.text.IDocument;
  21 import org.eclipse.jface.text.Position;
  22 import org.eclipse.jface.text.source.Annotation;
  23 import org.eclipse.jface.text.source.IAnnotationHover;
  24 import org.eclipse.jface.text.source.IAnnotationModel;
  25 import org.eclipse.jface.text.source.ISourceViewer;
  26
  27 /**
  28  * Implements simple annotation hover to show the associated messages.
  29  */
  30 public class XMLAnnotationHover implements IAnnotationHover {
  31         /*
  32          * @see org.eclipse.jface.text.source.IAnnotationHover#getHoverInfo(org.eclipse.jface.text.source.ISourceViewer,
  33          *      int)
  34          */
  35         public String getHoverInfo(ISourceViewer sourceViewer, int lineNumber) {
  36                 List annotations = getAnnotationsForLine(sourceViewer, lineNumber);
  37                 if (annotations != null) {
  38                         List messages = new ArrayList();
  39
  40                         Iterator e = annotations.iterator();
  41                         while (e.hasNext()) {
  42                                 Annotation annotation = (Annotation) e.next();
  43
  44                                 String message = annotation.getText();
  45                                 if (message != null) {
  46                                         message = message.trim();
  47                                         if (message.length() > 0) {
  48                                                 messages.add(message);
  49                                         }
  50                                 }
  51                         }
  52
  53                         if (messages.size() == 1) {
  54                                 return (String) messages.get(0);
  55                         }
  56
  57                         if (messages.size() > 1) {
  58                                 return formatMessages(messages);
  59                         }
  60                 }
  61
  62                 return null;
  63         }
  64
  65         /**
  66          * Formats multiple annotation messages for display.
  67          */
  68         private String formatMessages(List messages) {
  69                 StringBuffer buffer = new StringBuffer();
  70
  71                 Iterator e = messages.iterator();
  72                 while (e.hasNext()) {
  73                         buffer.append("- "); //$NON-NLS-1$
  74                         buffer.append(e.next());
  75                         buffer.append('\n');
  76                 }
  77
  78                 return buffer.toString();
  79         }
  80
  81         /**
  82          * Returns annotations for the ruler's line of activity.
  83          */
  84         private List getAnnotationsForLine(ISourceViewer viewer, int line) {
  85                 IDocument document = viewer.getDocument();
  86
  87                 IAnnotationModel model = viewer.getAnnotationModel();
  88                 if (model == null) {
  89                         return null;
  90                 }
  91
  92                 List retVal = new ArrayList();
  93
  94                 Iterator e = new XMLAnnotationIterator(model, true);
  95                 while (e.hasNext()) {
  96                         Annotation a = (Annotation) e.next();
  97
  98                         Position position = model.getPosition(a);
  99                         if (position != null) {
 100                                 try {
 101                                         int annotationLine = document.getLineOfOffset(position
 102                                                         .getOffset());
 103                                         if (annotationLine == line) {
 104                                                 retVal.add(a);
 105                                         }
 106                                 } catch (BadLocationException e1) {
 107                                         // ignore
 108                                 }
 109                         }
 110                 }
 111
 112                 return retVal;
 113         }
 114 }