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

/*
 * This code is copyright (c) 2005 David Owen.  All rights not explicitly
 * granted by the author are reserved.
 *
 * Created on Aug 2, 2005.
 */
package ws.fugue88.access;

import java.util.Map;

/**
 * @author dsowen
 */
public class MapAccessor implements Accessor {

        public MapAccessor(final Map map, final Object key, final Class type)
        {
                map.getClass();
                type.getClass();

                _map = map;
                _key = key;
                _type = type;
        }

        public Class getType()
        {
                return _type;
        }

        public void clearValue()
        {
                _map.remove(_key);
        }

        public Object getValue()
        {
                return check(_map.get(_key));
        }

        public void setValue(final Object value)
        {
                _map.put(_key, check(value));
        }

        private Object check(final Object obj)
        {
                if(obj != null && !_type.isInstance(obj))
                                throw new ClassCastException();
                return obj;
        }

        private final Map _map;
        private final Object _key;
        private final Class _type;
}