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/**
* Copyright (c) 2011-2013, Lukas Eder, [email protected]
* All rights reserved.
*
* This software is licensed to you under the Apache License, Version 2.0
* (the "License"); You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* . Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* . Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* . Neither the name "jOOU" nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package dorkbox.util.bytes;
import java.io.ObjectStreamException;
/**
* The unsigned int type
*
* @author Lukas Eder
* @author Ed Schaller
*/
public final class UInteger extends UNumber implements Comparable {
private static final Class CLASS = UInteger.class;
private static final String CLASS_NAME = CLASS.getName();
/**
* System property name for the property to set the size of the pre-cache.
*/
private static final String PRECACHE_PROPERTY = CLASS_NAME + ".precacheSize";
/**
* Default size for the value cache.
*/
private static final int DEFAULT_PRECACHE_SIZE = 256;
/**
* Generated UID
*/
private static final long serialVersionUID = -6821055240959745390L;
/**
* Cached values
*/
private static final UInteger[] VALUES = mkValues();
/**
* A constant holding the minimum value an unsigned int can
* have, 0.
*/
public static final long MIN_VALUE = 0x00000000;
/**
* A constant holding the maximum value an unsigned int can
* have, 232-1.
*/
public static final long MAX_VALUE = 0xFFFFFFFFL;
/**
* The value modelling the content of this unsigned int
*/
private final long value;
/**
* Figure out the size of the precache.
*
* @return The parsed value of the system property
* {@link #PRECACHE_PROPERTY} or {@link #DEFAULT_PRECACHE_SIZE} if
* the property is not set, not a number or retrieving results in a
* {@link SecurityException}. If the parsed value is zero or
* negative no cache will be created. If the value is larger than
* {@link Integer#MAX_VALUE} then Integer#MAX_VALUE will be used.
*/
private static final int getPrecacheSize() {
String prop = null;
long propParsed;
try {
prop = System.getProperty(PRECACHE_PROPERTY);
}
catch (SecurityException e) {
// security manager stopped us so use default
// FIXME: should we log this somewhere?
return DEFAULT_PRECACHE_SIZE;
}
if (prop == null) {
return DEFAULT_PRECACHE_SIZE;
}
if (prop.length() <= 0) {
// empty value
// FIXME: should we log this somewhere?
return DEFAULT_PRECACHE_SIZE;
}
try {
propParsed = Long.parseLong(prop);
}
catch (NumberFormatException e) {
// not a valid number
// FIXME: should we log this somewhere?
return DEFAULT_PRECACHE_SIZE;
}
// treat negative value as no cache...
if (propParsed < 0) {
return 0;
}
if (propParsed > Integer.MAX_VALUE) {
// FIXME: should we log this somewhere
return Integer.MAX_VALUE;
}
return (int) propParsed;
}
/**
* Generate a cached value for initial unsigned integer values.
*
* @return Array of cached values for UInteger
*/
private static final UInteger[] mkValues() {
int precacheSize = getPrecacheSize();
UInteger[] ret;
if (precacheSize <= 0) {
return null;
}
ret = new UInteger[precacheSize];
for (int i = 0; i < precacheSize; i++) {
ret[i] = new UInteger(i);
}
return ret;
}
/**
* Unchecked internal constructor. This serves two purposes: first it allows
* {@link #UInteger(long)} to stay deprecated without warnings and second
* constructor without unnecessary value checks.
*
* @param value The value to wrap
* @param unused Unused paramater to distinguish between this and the
* deprecated public constructor.
*/
private UInteger(long value, boolean unused) {
this.value = value;
}
/**
* Retrieve a cached value.
*
* @param value Cached value to retrieve
* @return Cached value if one exists. Null otherwise.
*/
private static UInteger getCached(long value) {
if (VALUES != null && value < VALUES.length) {
return VALUES[(int) value];
}
return null;
}
/**
* Get the value of a long without checking the value.
*/
private static UInteger valueOfUnchecked(long value) {
UInteger cached;
if ((cached = getCached(value)) != null) {
return cached;
}
return new UInteger(value, true);
}
/**
* Create an unsigned int
*
* @throws NumberFormatException If value does not contain a
* parsable unsigned int.
*/
public static UInteger valueOf(String value) throws NumberFormatException {
return valueOfUnchecked(rangeCheck(Long.parseLong(value)));
}
/**
* Create an unsigned int by masking it with
* 0xFFFFFFFF i.e. (int) -1 becomes
* (uint) 4294967295
*/
public static UInteger valueOf(int value) {
return valueOfUnchecked(value & MAX_VALUE);
}
/**
* Create an unsigned int
*
* @throws NumberFormatException If value is not in the range
* of an unsigned byte
*/
public static UInteger valueOf(long value) throws NumberFormatException {
return valueOfUnchecked(rangeCheck(value));
}
/**
* Create an unsigned int
*
* @throws NumberFormatException If value is not in the range
* of an unsigned int
*/
private UInteger(long value) throws NumberFormatException {
this.value = rangeCheck(value);
}
/**
* Create an unsigned int by masking it with
* 0xFFFFFFFF i.e. (int) -1 becomes
* (uint) 4294967295
*/
private UInteger(int value) {
this.value = value & MAX_VALUE;
}
/**
* Create an unsigned int
*
* @throws NumberFormatException If value does not contain a
* parsable unsigned int.
*/
private UInteger(String value) throws NumberFormatException {
this.value = rangeCheck(Long.parseLong(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 long rangeCheck(long value) throws NumberFormatException {
if (value < MIN_VALUE || value > MAX_VALUE) {
throw new NumberFormatException("Value is out of range : " + value);
}
return value;
}
/**
* Replace version read through deserialization with cached version.
*
* @return cached instance of this object's value if one exists, otherwise
* this object
* @throws ObjectStreamException
*/
private Object readResolve() throws ObjectStreamException {
UInteger cached;
// the value read could be invalid so check it
rangeCheck(this.value);
if ((cached = getCached(this.value)) != null) {
return cached;
}
return this;
}
@Override
public int intValue() {
return (int) this.value;
}
@Override
public long longValue() {
return this.value;
}
@Override
public float floatValue() {
return this.value;
}
@Override
public double doubleValue() {
return this.value;
}
@Override
public int hashCode() {
return Long.valueOf(this.value).hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof UInteger) {
return this.value == ((UInteger) obj).value;
}
return false;
}
@Override
public String toString() {
return Long.valueOf(this.value).toString();
}
@Override
public String toHexString() {
return Long.toHexString(this.value);
}
@Override
public int compareTo(UInteger o) {
return this.value < o.value ? -1 : this.value == o.value ? 0 : 1;
}
}
