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.codec; 019 020import java.io.Serializable; 021import java.sql.SQLException; 022 023import net.sf.hajdbc.IdentifiableMatcher; 024import net.sf.hajdbc.util.ServiceLoaders; 025 026/** 027 * Codec factory that whose decoding behavior is determined by a prefix. 028 * @author Paul Ferraro 029 */ 030public class MultiplexingDecoderFactory implements DecoderFactory, Serializable { 031 032 public static final String DELIMITER = ":"; 033 private static final long serialVersionUID = 4413927326976263687L; 034 035 @Override 036 public Decoder createDecoder(String clusterId) 037 { 038 return new MultiplexingDecoder(clusterId); 039 } 040 041 private static class MultiplexingDecoder implements Decoder 042 { 043 private final String clusterId; 044 045 MultiplexingDecoder(String clusterId) 046 { 047 this.clusterId = clusterId; 048 } 049 050 @Override 051 public String decode(String value) throws SQLException 052 { 053 if (value == null) return null; 054 int index = value.indexOf(DELIMITER); 055 String id = (index >= 0) ? value.substring(0, index) : null; 056 String source = (index >= 0) ? value.substring(index + 1) : value; 057 CodecFactory factory = ServiceLoaders.findRequiredService(new IdentifiableMatcher<CodecFactory>(id), CodecFactory.class); 058 return factory.createCodec(this.clusterId).decode(source); 059 } 060 } 061}