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jOOU is a recursive acronym that stands for jOOU Object Oriented Unsigned Types. It is a simple wrapper for UByte, UShort, UInteger, ULong types
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/*
* Copyright (c) Data Geekery GmbH (http://www.datageekery.com)
*
* Licensed 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.joou;
import java.io.ObjectStreamException;
import java.math.BigInteger;
/**
* The unsigned byte type
*
* @author Lukas Eder
* @author Ed Schaller
* @author Jens Nerche
*/
public final class UByte extends UNumber implements Comparable {
/**
* Generated UID
*/
private static final long serialVersionUID = -6821055240959745390L;
/**
* Cached values
*/
private static final UByte[] VALUES = mkValues();
/**
* A constant holding the minimum value an unsigned byte can
* have, 0.
*/
public static final short MIN_VALUE = 0x00;
/**
* A constant holding the maximum value an unsigned byte can
* have, 28-1.
*/
public static final short MAX_VALUE = 0xff;
/**
* A constant holding the minimum value an unsigned byte can
* have as UByte, 0.
*/
public static final UByte MIN = valueOf(0x00);
/**
* A constant holding the maximum value an unsigned byte can
* have as UByte, 28-1.
*/
public static final UByte MAX = valueOf(0xff);
/**
* The value modelling the content of this unsigned byte
*/
private final short value;
/**
* Generate a cached value for each byte value.
*
* @return Array of cached values for UByte.
*/
private static final UByte[] mkValues() {
UByte[] ret = new UByte[256];
for (int i = Byte.MIN_VALUE; i <= Byte.MAX_VALUE; i++)
ret[i & MAX_VALUE] = new UByte((byte) i);
return ret;
}
/**
* Get an instance of an unsigned byte
*
* @throws NumberFormatException If value does not contain a
* parsable unsigned byte.
*/
public static UByte valueOf(String value) throws NumberFormatException {
return valueOfUnchecked(rangeCheck(Short.parseShort(value)));
}
/**
* Get an instance of an unsigned byte by masking it with
* 0xFF i.e. (byte) -1 becomes
* (ubyte) 255
*/
public static UByte valueOf(byte value) {
return valueOfUnchecked((short) (value & MAX_VALUE));
}
/**
* Get the value of a short without checking the value.
*/
private static UByte valueOfUnchecked(short value) throws NumberFormatException {
return VALUES[value & MAX_VALUE];
}
/**
* Get an instance of an unsigned byte
*
* @throws NumberFormatException If value is not in the range
* of an unsigned byte
*/
public static UByte valueOf(short value) throws NumberFormatException {
return valueOfUnchecked(rangeCheck(value));
}
/**
* Get an instance of an unsigned byte
*
* @throws NumberFormatException If value is not in the range
* of an unsigned byte
*/
public static UByte valueOf(int value) throws NumberFormatException {
return valueOfUnchecked(rangeCheck(value));
}
/**
* Get an instance of an unsigned byte
*
* @throws NumberFormatException If value is not in the range
* of an unsigned byte
*/
public static UByte valueOf(long value) throws NumberFormatException {
return valueOfUnchecked(rangeCheck(value));
}
/**
* Create an unsigned byte
*
* @throws NumberFormatException If value is not in the range
* of an unsigned byte
*/
private UByte(long value) throws NumberFormatException {
this.value = rangeCheck(value);
}
/**
* Create an unsigned byte
*
* @throws NumberFormatException If value is not in the range
* of an unsigned byte
*/
private UByte(int value) throws NumberFormatException {
this.value = rangeCheck(value);
}
/**
* Create an unsigned byte
*
* @throws NumberFormatException If value is not in the range
* of an unsigned byte
*/
private UByte(short value) throws NumberFormatException {
this.value = rangeCheck(value);
}
/**
* Create an unsigned byte by masking it with 0xFF
* i.e. (byte) -1 becomes (ubyte) 255
*/
private UByte(byte value) {
this.value = (short) (value & MAX_VALUE);
}
/**
* Create an unsigned byte
*
* @throws NumberFormatException If value does not contain a
* parsable unsigned byte.
*/
private UByte(String value) throws NumberFormatException {
this.value = rangeCheck(Short.parseShort(value));
}
/**
* Throw exception if value out of range (short version)
*
* @param value Value to check
* @return value if it is in range
* @throws NumberFormatException if value is out of range
*/
private static short rangeCheck(short value) throws NumberFormatException {
if (value < MIN_VALUE || value > MAX_VALUE)
throw new NumberFormatException("Value is out of range : " + value);
return value;
}
/**
* Throw exception if value out of range (int version)
*
* @param value Value to check
* @return value if it is in range
* @throws NumberFormatException if value is out of range
*/
private static short rangeCheck(int value) throws NumberFormatException {
if (value < MIN_VALUE || value > MAX_VALUE)
throw new NumberFormatException("Value is out of range : " + value);
return (short) value;
}
/**
* Throw exception if value out of range (long version)
*
* @param value Value to check
* @return value if it is in range
* @throws NumberFormatException if value is out of range
*/
private static short rangeCheck(long value) throws NumberFormatException {
if (value < MIN_VALUE || value > MAX_VALUE)
throw new NumberFormatException("Value is out of range : " + value);
return (short) value;
}
/**
* Replace version read through deserialization with cached version. Note
* that this does not use the {@link #valueOfUnchecked(short)} as we have no
* guarantee that the value from the stream is valid.
*
* @return cached instance of this object's value
* @throws ObjectStreamException
*/
private Object readResolve() throws ObjectStreamException {
return valueOf(value);
}
@Override
public int intValue() {
return value;
}
@Override
public long longValue() {
return value;
}
@Override
public float floatValue() {
return value;
}
@Override
public double doubleValue() {
return value;
}
@Override
public int hashCode() {
return Short.valueOf(value).hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj instanceof UByte)
return value == ((UByte) obj).value;
return false;
}
@Override
public String toString() {
return Short.valueOf(value).toString();
}
@Override
public int compareTo(UByte o) {
return (value < o.value ? -1 : (value == o.value ? 0 : 1));
}
@Override
public BigInteger toBigInteger() {
return BigInteger.valueOf(value);
}
public UByte add(UByte val) throws NumberFormatException {
return valueOf(value + val.value);
}
public UByte add(int val) throws NumberFormatException {
return valueOf(value + val);
}
public UByte subtract(final UByte val) {
return valueOf(value - val.value);
}
public UByte subtract(final int val) {
return valueOf(value - val);
}
}
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