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/*-
 * Copyright (C) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
 *
 * This file was distributed by Oracle as part of a version of Oracle Berkeley
 * DB Java Edition made available at:
 *
 * http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html
 *
 * Please see the LICENSE file included in the top-level directory of the
 * appropriate version of Oracle Berkeley DB Java Edition for a copy of the
 * license and additional information.
 */

package com.sleepycat.bind.tuple;

import java.math.BigInteger;

import com.sleepycat.je.DatabaseEntry;

/**
 * A concrete TupleBinding for a BigInteger value.
 *
 * This class produces byte array values that by default (without a custom
 * comparator) sort correctly.
 *
 * @see Integer Formats
 */
public class BigIntegerBinding extends TupleBinding {

    // javadoc is inherited
    public BigInteger entryToObject(TupleInput input) {

        return input.readBigInteger();
    }

    // javadoc is inherited
    public void objectToEntry(BigInteger object, TupleOutput output) {

        output.writeBigInteger(object);
    }

    // javadoc is inherited
    protected TupleOutput getTupleOutput(BigInteger object) {

        return sizedOutput(object);
    }

    /**
     * Converts an entry buffer into a BigInteger value.
     *
     * @param entry is the source entry buffer.
     *
     * @return the resulting value.
     */
    public static BigInteger entryToBigInteger(DatabaseEntry entry) {

        return entryToInput(entry).readBigInteger();
    }

    /**
     * Converts a BigInteger value into an entry buffer.
     *
     * @param val is the source value.
     *
     * @param entry is the destination entry buffer.
     */
    public static void bigIntegerToEntry(BigInteger val, DatabaseEntry entry) {

        outputToEntry(sizedOutput(val).writeBigInteger(val), entry);
    }

    /**
     * Returns a tuple output object of the exact size needed, to avoid
     * wasting space when a single primitive is output.
     */
    private static TupleOutput sizedOutput(BigInteger val) {

        int len = TupleOutput.getBigIntegerByteLength(val);
        return new TupleOutput(new byte[len]);
    }
}