Index: trunk/src/ws/fugue88/access/Accessor.java
===================================================================
--- trunk/src/ws/fugue88/access/Accessor.java	(revision 2)
+++ trunk/src/ws/fugue88/access/Accessor.java	(revision 3)
@@ -1,5 +1,5 @@
 /*
  * This code is copyright (c) 2005 David Owen.  All rights not explicitly
- * granted in a license accompanying this file are reserved.
+ * granted by the author are reserved.
  *
  * Created on Aug 2, 2005.
Index: trunk/src/ws/fugue88/access/ContainmentAccessor.java
===================================================================
--- trunk/src/ws/fugue88/access/ContainmentAccessor.java	(revision 3)
+++ trunk/src/ws/fugue88/access/ContainmentAccessor.java	(revision 3)
@@ -0,0 +1,67 @@
+/*
+ * This code is copyright (c) 2005 David Owen.  All rights not explicitly
+ * granted by the author are reserved.
+ * 
+ * Created on Oct 4, 2005.
+ */
+package ws.fugue88.access;
+
+import java.util.Collection;
+
+/**
+ * Represents the containment property of a given collection and object.
+ * 
+ * @author dsowen
+ */
+public class ContainmentAccessor implements Accessor {
+
+	public ContainmentAccessor(final Collection coll, final Object obj)
+	{
+		coll.getClass();
+
+		_coll = coll;
+		_obj = obj;
+	}
+
+	/**
+	 * @return <code>Boolean.class</code>
+	 */
+	public Class getType()
+	{
+		return Boolean.class;
+	}
+
+	/**
+	 * Equivalent to <code>setValue(Boolean.FALSE);</code>.
+	 */
+	public void clearValue()
+	{
+		setValue(Boolean.FALSE);
+	}
+
+	/**
+	 * @return <code>true</code> iff the collection contains the object
+	 */
+	public Object getValue()
+	{
+		return Boolean.valueOf(_coll.contains(_obj));
+	}
+
+	/**
+	 * If <var>value </var> is <code>true</code> or <code>false</code>,
+	 * ensures that the collection does or doesn't contain, respectively, the
+	 * object.
+	 */
+	public void setValue(final Object value)
+	{
+		if(((Boolean)value).booleanValue()) {
+			if(!_coll.contains(_obj)) _coll.add(_obj);
+		} else {
+			while(_coll.contains(_obj))
+				_coll.remove(_obj);
+		}
+	}
+
+	private final Collection _coll;
+	private final Object _obj;
+}
Index: trunk/src/ws/fugue88/access/MapAccessor.java
===================================================================
--- trunk/src/ws/fugue88/access/MapAccessor.java	(revision 2)
+++ trunk/src/ws/fugue88/access/MapAccessor.java	(revision 3)
@@ -1,5 +1,5 @@
 /*
  * This code is copyright (c) 2005 David Owen.  All rights not explicitly
- * granted in a license accompanying this file are reserved.
+ * granted by the author are reserved.
  *
  * Created on Aug 2, 2005.