diff -r 000000000000 -r 461397695234 samples/javabeans/src/org/apidesign/javabeans/with/AbstractHighlightsContainer.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/javabeans/src/org/apidesign/javabeans/with/AbstractHighlightsContainer.java	Sat Jun 14 09:54:22 2008 +0200
@@ -0,0 +1,41 @@
+package org.apidesign.javabeans.with;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public abstract class AbstractHighlightsContainer implements HighlightsContainer {
+    private List<HighlightsChangeListener> listeners = new ArrayList<HighlightsChangeListener>();
+
+    protected AbstractHighlightsContainer() {
+    }
+
+    public abstract HighlightsSequence getHighlights(int startOffset, int endOffset);
+
+    public final void addHighlightsChangeListener(HighlightsChangeListener listener) {
+        synchronized (listeners) {
+            listeners.add(listener);
+        }
+    }
+
+    public final void removeHighlightsChangeListener(HighlightsChangeListener listener) {
+        synchronized (listeners) {
+            listeners.remove(listener);
+        }
+    }
+
+    protected final void fireHighlightsChange(int changeStartOffset, int changeEndOffset) {
+        List<HighlightsChangeListener> targets;
+
+        synchronized (listeners) {
+            targets = new ArrayList<HighlightsChangeListener>(listeners);
+        }
+
+        if (targets.size() > 0) {
+            HighlightsChangeEvent evt = new HighlightsChangeEvent(this, changeStartOffset, changeEndOffset);
+
+            for (HighlightsChangeListener l : targets) {
+                l.highlightChanged(evt);
+            }
+        }
+    }
+}