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/*
* Copyright 2006 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* 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 com.amazon.carbonado.sequence;
import java.math.BigInteger;
import com.amazon.carbonado.PersistException;
/**
*
*
* @author Brian S O'Neill
*/
public abstract class AbstractSequenceValueProducer implements SequenceValueProducer {
protected AbstractSequenceValueProducer() {
}
public int nextIntValue() throws PersistException {
return (int) nextLongValue();
}
public String nextDecimalValue() throws PersistException {
return nextNumericalValue(10, 0);
}
public String nextNumericalValue(int radix, int minLength) throws PersistException {
long next = nextLongValue();
String str;
if (next >= 0) {
str = Long.toString(next, radix);
} else {
// Use BigInteger to print negative values as positive by expanding
// precision to 72 bits
byte[] bytes = new byte[9];
bytes[8] = (byte) (next & 0xff);
bytes[7] = (byte) ((next >>= 8) & 0xff);
bytes[6] = (byte) ((next >>= 8) & 0xff);
bytes[5] = (byte) ((next >>= 8) & 0xff);
bytes[4] = (byte) ((next >>= 8) & 0xff);
bytes[3] = (byte) ((next >>= 8) & 0xff);
bytes[2] = (byte) ((next >>= 8) & 0xff);
bytes[1] = (byte) ((next >>= 8) & 0xff);
//bytes[0] = 0;
str = new BigInteger(bytes).toString(radix);
}
int pad = minLength - str.length();
if (pad > 0) {
StringBuilder b = new StringBuilder(minLength);
while (--pad >= 0) {
b.append('0');
}
b.append(str);
str = b.toString();
}
return str;
}
}
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