1/*- 2 * See the file LICENSE for redistribution information. 3 * 4 * Copyright (c) 2000,2008 Oracle. All rights reserved. 5 * 6 * $Id: BigIntegerBinding.java,v 12.3 2008/01/08 20:58:36 bostic Exp $ 7 */ 8 9package com.sleepycat.bind.tuple; 10 11import java.math.BigInteger; 12 13import com.sleepycat.db.DatabaseEntry; 14 15/** 16 * A concrete <code>TupleBinding</code> for a <code>BigInteger</code> value. 17 */ 18public class BigIntegerBinding extends TupleBinding { 19 20 // javadoc is inherited 21 public Object entryToObject(TupleInput input) { 22 23 return input.readBigInteger(); 24 } 25 26 // javadoc is inherited 27 public void objectToEntry(Object object, TupleOutput output) { 28 29 output.writeBigInteger((BigInteger) object); 30 } 31 32 // javadoc is inherited 33 protected TupleOutput getTupleOutput(Object object) { 34 35 return sizedOutput((BigInteger) object); 36 } 37 38 /** 39 * Converts an entry buffer into a <code>BigInteger</code> value. 40 * 41 * @param entry is the source entry buffer. 42 * 43 * @return the resulting value. 44 */ 45 public static BigInteger entryToBigInteger(DatabaseEntry entry) { 46 47 return entryToInput(entry).readBigInteger(); 48 } 49 50 /** 51 * Converts a <code>BigInteger</code> value into an entry buffer. 52 * 53 * @param val is the source value. 54 * 55 * @param entry is the destination entry buffer. 56 */ 57 public static void bigIntegerToEntry(BigInteger val, DatabaseEntry entry) { 58 59 outputToEntry(sizedOutput(val).writeBigInteger(val), entry); 60 } 61 62 /** 63 * Returns a tuple output object of the exact size needed, to avoid 64 * wasting space when a single primitive is output. 65 */ 66 private static TupleOutput sizedOutput(BigInteger val) { 67 68 int len = TupleOutput.getBigIntegerByteLength(val); 69 return new TupleOutput(new byte[len]); 70 } 71} 72