001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.activemq.util; 018 019 import java.util.Date; 020 import java.util.HashMap; 021 022 import org.apache.activemq.command.ActiveMQDestination; 023 024 public final class TypeConversionSupport { 025 026 static class ConversionKey { 027 final Class from; 028 final Class to; 029 final int hashCode; 030 031 public ConversionKey(Class from, Class to) { 032 this.from = from; 033 this.to = to; 034 this.hashCode = from.hashCode() ^ (to.hashCode() << 1); 035 } 036 037 public boolean equals(Object o) { 038 ConversionKey x = (ConversionKey)o; 039 return x.from == from && x.to == to; 040 } 041 042 public int hashCode() { 043 return hashCode; 044 } 045 } 046 047 interface Converter { 048 Object convert(Object value); 049 } 050 051 private static final HashMap<ConversionKey, Converter> CONVERSION_MAP = new HashMap<ConversionKey, Converter>(); 052 static { 053 Converter toStringConverter = new Converter() { 054 public Object convert(Object value) { 055 return value.toString(); 056 } 057 }; 058 CONVERSION_MAP.put(new ConversionKey(Boolean.class, String.class), toStringConverter); 059 CONVERSION_MAP.put(new ConversionKey(Byte.class, String.class), toStringConverter); 060 CONVERSION_MAP.put(new ConversionKey(Short.class, String.class), toStringConverter); 061 CONVERSION_MAP.put(new ConversionKey(Integer.class, String.class), toStringConverter); 062 CONVERSION_MAP.put(new ConversionKey(Long.class, String.class), toStringConverter); 063 CONVERSION_MAP.put(new ConversionKey(Float.class, String.class), toStringConverter); 064 CONVERSION_MAP.put(new ConversionKey(Double.class, String.class), toStringConverter); 065 066 CONVERSION_MAP.put(new ConversionKey(String.class, Boolean.class), new Converter() { 067 public Object convert(Object value) { 068 return Boolean.valueOf((String)value); 069 } 070 }); 071 CONVERSION_MAP.put(new ConversionKey(String.class, Byte.class), new Converter() { 072 public Object convert(Object value) { 073 return Byte.valueOf((String)value); 074 } 075 }); 076 CONVERSION_MAP.put(new ConversionKey(String.class, Short.class), new Converter() { 077 public Object convert(Object value) { 078 return Short.valueOf((String)value); 079 } 080 }); 081 CONVERSION_MAP.put(new ConversionKey(String.class, Integer.class), new Converter() { 082 public Object convert(Object value) { 083 return Integer.valueOf((String)value); 084 } 085 }); 086 CONVERSION_MAP.put(new ConversionKey(String.class, Long.class), new Converter() { 087 public Object convert(Object value) { 088 return Long.valueOf((String)value); 089 } 090 }); 091 CONVERSION_MAP.put(new ConversionKey(String.class, Float.class), new Converter() { 092 public Object convert(Object value) { 093 return Float.valueOf((String)value); 094 } 095 }); 096 CONVERSION_MAP.put(new ConversionKey(String.class, Double.class), new Converter() { 097 public Object convert(Object value) { 098 return Double.valueOf((String)value); 099 } 100 }); 101 102 Converter longConverter = new Converter() { 103 public Object convert(Object value) { 104 return Long.valueOf(((Number)value).longValue()); 105 } 106 }; 107 CONVERSION_MAP.put(new ConversionKey(Byte.class, Long.class), longConverter); 108 CONVERSION_MAP.put(new ConversionKey(Short.class, Long.class), longConverter); 109 CONVERSION_MAP.put(new ConversionKey(Integer.class, Long.class), longConverter); 110 CONVERSION_MAP.put(new ConversionKey(Date.class, Long.class), new Converter() { 111 public Object convert(Object value) { 112 return Long.valueOf(((Date)value).getTime()); 113 } 114 }); 115 116 Converter intConverter = new Converter() { 117 public Object convert(Object value) { 118 return Integer.valueOf(((Number)value).intValue()); 119 } 120 }; 121 CONVERSION_MAP.put(new ConversionKey(Byte.class, Integer.class), intConverter); 122 CONVERSION_MAP.put(new ConversionKey(Short.class, Integer.class), intConverter); 123 124 CONVERSION_MAP.put(new ConversionKey(Byte.class, Short.class), new Converter() { 125 public Object convert(Object value) { 126 return Short.valueOf(((Number)value).shortValue()); 127 } 128 }); 129 130 CONVERSION_MAP.put(new ConversionKey(Float.class, Double.class), new Converter() { 131 public Object convert(Object value) { 132 return new Double(((Number)value).doubleValue()); 133 } 134 }); 135 CONVERSION_MAP.put(new ConversionKey(String.class, ActiveMQDestination.class), new Converter() { 136 public Object convert(Object value) { 137 return ActiveMQDestination.createDestination((String)value, ActiveMQDestination.QUEUE_TYPE); 138 } 139 }); 140 } 141 142 private TypeConversionSupport() { 143 } 144 145 public static Object convert(Object value, Class clazz) { 146 147 assert value != null && clazz != null; 148 149 if (value.getClass() == clazz) { 150 return value; 151 } 152 153 Converter c = CONVERSION_MAP.get(new ConversionKey(value.getClass(), clazz)); 154 if (c == null) { 155 return null; 156 } 157 return c.convert(value); 158 159 } 160 161 }