001/*
002 * HA-JDBC: High-Availability JDBC
003 * Copyright (C) 2012  Paul Ferraro
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Lesser General Public License as published by
007 * the Free Software Foundation, either version 3 of the License, or
008 * (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Lesser General Public License for more details.
014 *
015 * You should have received a copy of the GNU Lesser General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018package net.sf.hajdbc.util;
019
020import java.util.Map;
021
022/**
023 * @author Paul Ferraro
024 */
025public class SimpleStaticRegistry<K, V> implements StaticRegistry<K, V>
026{
027        private final ExceptionMessageFactory<K> factory;
028        private final Map<K, V> map;
029        
030        public SimpleStaticRegistry(Map<K, V> map)
031        {
032                this(null, map);
033        }
034        
035        public SimpleStaticRegistry(ExceptionMessageFactory<K> factory, Map<K, V> map)
036        {
037                this.factory = factory;
038                this.map = map;
039        }
040
041        /**
042         * {@inheritDoc}
043         * @see net.sf.hajdbc.util.StaticRegistry#get(java.lang.Object)
044         */
045        @Override
046        public V get(K key)
047        {
048                V value = this.map.get(key);
049                if ((value == null) && (this.factory != null))
050                {
051                        throw new IllegalArgumentException(this.factory.createMessage(key));
052                }
053                return value;
054        }
055        
056        public interface ExceptionMessageFactory<K>
057        {
058                String createMessage(K key);
059        }
060}