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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.utils;
import com.google.common.primitives.UnsignedInteger;
import com.google.common.primitives.UnsignedInts;
/**
* This class packages several UInt utility methods so we can easily change it's implementation when needed.
*/
public class CassandraUInt
{
/**
* Returns the long representation of the maximum value we can hold
*/
public final static long MAX_VALUE_LONG = UnsignedInteger.MAX_VALUE.longValue();
/**
* Returns the UInt representation of the maximum value we can hold
*/
public final static int MAX_VALUE_UINT = UnsignedInteger.MAX_VALUE.intValue();
/**
* Converts a long to it's unsigned integer representation
*
* @param value A long between 0 and 232-1 inclusive
* @return an unsigned integer representation of the long
* @throws IllegalArgumentException if value '< 0' or '>= 232'
*/
public static int fromLong(long value)
{
return UnsignedInts.checkedCast(value);
}
/**
* The same but works on an array on longs
*
*/
public static int[] fromLong(long[] values)
{
int[] delTimesUints = new int[values.length];
for (int i=0; i < values.length; i++)
delTimesUints[i] = CassandraUInt.fromLong(values[i]);
return delTimesUints;
}
/**
* Returns the long resulting from parsing the int as an unsigned integer
*
* @param value Unsigned integer representation of the long
* @return The long resulting from parsing the int as an unsigned integer
*/
public static long toLong(int value)
{
return UnsignedInts.toLong(value);
}
/**
* Compare 2 Uints
*
* @return < 0 if x is less than y. > 0 if x is greater than y. Zero if they are equal
*/
public static int compare(int x, int y)
{
return UnsignedInts.compare(x, y);
}
}