/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.transport.amqp.client.util;
import java.util.Date;
import java.util.HashMap;
public final class TypeConversionSupport {
static class ConversionKey {
final Class<?> from;
final Class<?> to;
final int hashCode;
public ConversionKey(Class<?> from, Class<?> to) {
this.from = from;
this.to = to;
this.hashCode = from.hashCode() ^ (to.hashCode() << 1);
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || o.getClass() != this.getClass()) {
return false;
}
ConversionKey x = (ConversionKey) o;
return x.from == from && x.to == to;
}
@Override
public int hashCode() {
return hashCode;
}
}
interface Converter {
Object convert(Object value);
}
private static final HashMap<ConversionKey, Converter> CONVERSION_MAP = new HashMap<ConversionKey, Converter>();
static {
Converter toStringConverter = new Converter() {
@Override
public Object convert(Object value) {
return value.toString();
}
};
CONVERSION_MAP.put(new ConversionKey(Boolean.class, String.class), toStringConverter);
CONVERSION_MAP.put(new ConversionKey(Byte.class, String.class), toStringConverter);
CONVERSION_MAP.put(new ConversionKey(Short.class, String.class), toStringConverter);
CONVERSION_MAP.put(new ConversionKey(Integer.class, String.class), toStringConverter);
CONVERSION_MAP.put(new ConversionKey(Long.class, String.class), toStringConverter);
CONVERSION_MAP.put(new ConversionKey(Float.class, String.class), toStringConverter);
CONVERSION_MAP.put(new ConversionKey(Double.class, String.class), toStringConverter);
CONVERSION_MAP.put(new ConversionKey(String.class, Boolean.class), new Converter() {
@Override
public Object convert(Object value) {
return Boolean.valueOf((String) value);
}
});
CONVERSION_MAP.put(new ConversionKey(String.class, Byte.class), new Converter() {
@Override
public Object convert(Object value) {
return Byte.valueOf((String) value);
}
});
CONVERSION_MAP.put(new ConversionKey(String.class, Short.class), new Converter() {
@Override
public Object convert(Object value) {
return Short.valueOf((String) value);
}
});
CONVERSION_MAP.put(new ConversionKey(String.class, Integer.class), new Converter() {
@Override
public Object convert(Object value) {
return Integer.valueOf((String) value);
}
});
CONVERSION_MAP.put(new ConversionKey(String.class, Long.class), new Converter() {
@Override
public Object convert(Object value) {
return Long.valueOf((String) value);
}
});
CONVERSION_MAP.put(new ConversionKey(String.class, Float.class), new Converter() {
@Override
public Object convert(Object value) {
return Float.valueOf((String) value);
}
});
CONVERSION_MAP.put(new ConversionKey(String.class, Double.class), new Converter() {
@Override
public Object convert(Object value) {
return Double.valueOf((String) value);
}
});
Converter longConverter = new Converter() {
@Override
public Object convert(Object value) {
return Long.valueOf(((Number) value).longValue());
}
};
CONVERSION_MAP.put(new ConversionKey(Byte.class, Long.class), longConverter);
CONVERSION_MAP.put(new ConversionKey(Short.class, Long.class), longConverter);
CONVERSION_MAP.put(new ConversionKey(Integer.class, Long.class), longConverter);
CONVERSION_MAP.put(new ConversionKey(Date.class, Long.class), new Converter() {
@Override
public Object convert(Object value) {
return Long.valueOf(((Date) value).getTime());
}
});
Converter intConverter = new Converter() {
@Override
public Object convert(Object value) {
return Integer.valueOf(((Number) value).intValue());
}
};
CONVERSION_MAP.put(new ConversionKey(Byte.class, Integer.class), intConverter);
CONVERSION_MAP.put(new ConversionKey(Short.class, Integer.class), intConverter);
CONVERSION_MAP.put(new ConversionKey(Byte.class, Short.class), new Converter() {
@Override
public Object convert(Object value) {
return Short.valueOf(((Number) value).shortValue());
}
});
CONVERSION_MAP.put(new ConversionKey(Float.class, Double.class), new Converter() {
@Override
public Object convert(Object value) {
return new Double(((Number) value).doubleValue());
}
});
}
public static Object convert(Object value, Class<?> toClass) {
assert value != null && toClass != null;
if (value.getClass() == toClass) {
return value;
}
Class<?> fromClass = value.getClass();
if (fromClass.isPrimitive()) {
fromClass = convertPrimitiveTypeToWrapperType(fromClass);
}
if (toClass.isPrimitive()) {
toClass = convertPrimitiveTypeToWrapperType(toClass);
}
Converter c = CONVERSION_MAP.get(new ConversionKey(fromClass, toClass));
if (c == null) {
return null;
}
return c.convert(value);
}
private static Class<?> convertPrimitiveTypeToWrapperType(Class<?> type) {
Class<?> rc = type;
if (type.isPrimitive()) {
if (type == int.class) {
rc = Integer.class;
} else if (type == long.class) {
rc = Long.class;
} else if (type == double.class) {
rc = Double.class;
} else if (type == float.class) {
rc = Float.class;
} else if (type == short.class) {
rc = Short.class;
} else if (type == byte.class) {
rc = Byte.class;
} else if (type == boolean.class) {
rc = Boolean.class;
}
}
return rc;
}
private TypeConversionSupport() {}
}