source: trunk/src/ws/fugue88/access/ContainmentAccessor.java

/*
 * 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;
}