--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/source/DefaultAnnotationHover.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,239 @@
+/*******************************************************************************
+ * Copyright (c) 2006, 2007 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.jface.text.source.DefaultAnnotationHover;
+
+import dwt.dwthelper.utils;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import dwtx.jface.text.BadLocationException;
+import dwtx.jface.text.IDocument;
+import dwtx.jface.text.Position;
+import dwtx.jface.text.source.projection.AnnotationBag;
+
+/**
+ * Standard implementation of {@link dwtx.jface.text.source.IAnnotationHover}.
+ * 
+ * @since 3.2
+ */
+public class DefaultAnnotationHover : IAnnotationHover {
+    
+    
+    /**
+     * Tells whether the line number should be shown when no annotation is found
+     * under the cursor.
+     * 
+     * @since 3.4
+     */
+    private bool fShowLineNumber;
+
+    /**
+     * Creates a new default annotation hover.
+     * 
+     * @since 3.4
+     */
+    public DefaultAnnotationHover() {
+        this(false);
+    }
+
+    /**
+     * Creates a new default annotation hover.
+     * 
+     * @param showLineNumber <code>true</code> if the line number should be shown when no annotation is found
+     * @since 3.4
+     */
+    public DefaultAnnotationHover(bool showLineNumber) {
+        fShowLineNumber= showLineNumber;
+    }
+    
+    /*
+     * @see dwtx.jface.text.source.IAnnotationHover#getHoverInfo(dwtx.jface.text.source.ISourceViewer, int)
+     */
+    public String getHoverInfo(ISourceViewer sourceViewer, int lineNumber) {
+        List javaAnnotations= getAnnotationsForLine(sourceViewer, lineNumber);
+        if (javaAnnotations !is null) {
+            
+            if (javaAnnotations.size() is 1) {
+                
+                // optimization
+                Annotation annotation= (Annotation) javaAnnotations.get(0);
+                String message= annotation.getText();
+                if (message !is null && message.trim().length() > 0)
+                    return formatSingleMessage(message);
+                
+            } else {
+                
+                List messages= new ArrayList();
+                
+                Iterator e= javaAnnotations.iterator();
+                while (e.hasNext()) {
+                    Annotation annotation= (Annotation) e.next();
+                    String message= annotation.getText();
+                    if (message !is null && message.trim().length() > 0)
+                        messages.add(message.trim());
+                }
+                
+                if (messages.size() is 1)
+                    return formatSingleMessage((String)messages.get(0));
+                
+                if (messages.size() > 1)
+                    return formatMultipleMessages(messages);
+            }
+        }
+
+        if (fShowLineNumber && lineNumber > -1)
+            return JFaceTextMessages.getFormattedString("DefaultAnnotationHover.lineNumber", new String[] { Integer.toString(lineNumber + 1) }); //$NON-NLS-1$
+
+        return null;
+    }
+    
+    /**
+     * Tells whether the annotation should be included in
+     * the computation.
+     * 
+     * @param annotation the annotation to test
+     * @return <code>true</code> if the annotation is included in the computation
+     */
+    protected bool isIncluded(Annotation annotation) {
+        return true;
+    }
+    
+    /**
+     * Hook method to format the given single message.
+     * <p>
+     * Subclasses can change this to create a different
+     * format like HTML.
+     * </p>
+     * 
+     * @param message the message to format
+     * @return the formatted message
+     */
+    protected String formatSingleMessage(String message) {
+        return message;
+    }
+    
+    /**
+     * Hook method to formats the given messages.
+     * <p>
+     * Subclasses can change this to create a different
+     * format like HTML.
+     * </p>
+     * 
+     * @param messages the messages to format
+     * @return the formatted message
+     */
+    protected String formatMultipleMessages(List messages) {
+        StringBuffer buffer= new StringBuffer();
+        buffer.append(JFaceTextMessages.getString("DefaultAnnotationHover.multipleMarkers")); //$NON-NLS-1$
+        
+        Iterator e= messages.iterator();
+        while (e.hasNext()) {
+            buffer.append('\n');
+            String listItemText= (String) e.next();
+            buffer.append(JFaceTextMessages.getFormattedString("DefaultAnnotationHover.listItem", new String[] { listItemText })); //$NON-NLS-1$
+        }
+        return buffer.toString();
+    }
+    
+    private bool isRulerLine(Position position, IDocument document, int line) {
+        if (position.getOffset() > -1 && position.getLength() > -1) {
+            try {
+                return line is document.getLineOfOffset(position.getOffset());
+            } catch (BadLocationException x) {
+            }
+        }
+        return false;
+    }
+    
+    private IAnnotationModel getAnnotationModel(ISourceViewer viewer) {
+        if (viewer instanceof ISourceViewerExtension2) {
+            ISourceViewerExtension2 extension= (ISourceViewerExtension2) viewer;
+            return extension.getVisualAnnotationModel();
+        }
+        return viewer.getAnnotationModel();
+    }
+    
+    private bool isDuplicateAnnotation(Map messagesAtPosition, Position position, String message) {
+        if (messagesAtPosition.containsKey(position)) {
+            Object value= messagesAtPosition.get(position);
+            if (message.equals(value))
+                return true;
+            
+            if (value instanceof List) {
+                List messages= (List)value;
+                if  (messages.contains(message))
+                    return true;
+
+                messages.add(message);
+            } else {
+                ArrayList messages= new ArrayList();
+                messages.add(value);
+                messages.add(message);
+                messagesAtPosition.put(position, messages);
+            }
+        } else
+            messagesAtPosition.put(position, message);
+        return false;
+    }
+    
+    private bool includeAnnotation(Annotation annotation, Position position, HashMap messagesAtPosition) {
+        if (!isIncluded(annotation))
+            return false;
+        
+        String text= annotation.getText();
+        return (text !is null && !isDuplicateAnnotation(messagesAtPosition, position, text));
+    }
+    
+    private List getAnnotationsForLine(ISourceViewer viewer, int line) {
+        IAnnotationModel model= getAnnotationModel(viewer);
+        if (model is null)
+            return null;
+        
+        IDocument document= viewer.getDocument();
+        List javaAnnotations= new ArrayList();
+        HashMap messagesAtPosition= new HashMap();
+        Iterator iterator= model.getAnnotationIterator();
+        
+        while (iterator.hasNext()) {
+            Annotation annotation= (Annotation) iterator.next();
+            
+            Position position= model.getPosition(annotation);
+            if (position is null)
+                continue;
+            
+            if (!isRulerLine(position, document, line))
+                continue;
+            
+            if (annotation instanceof AnnotationBag) {
+                AnnotationBag bag= (AnnotationBag) annotation;
+                Iterator e= bag.iterator();
+                while (e.hasNext()) {
+                    annotation= (Annotation) e.next();
+                    position= model.getPosition(annotation);
+                    if (position !is null && includeAnnotation(annotation, position, messagesAtPosition))
+                        javaAnnotations.add(annotation);
+                }
+                continue;
+            }
+            
+            if (includeAnnotation(annotation, position, messagesAtPosition))
+                javaAnnotations.add(annotation);
+        }
+        
+        return javaAnnotations;
+    }
+}