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 }