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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 com.sleepycat.je.DatabaseEntry;

/**
 * A concrete TupleBinding for a Long primitive
 * wrapper or a long primitive.
 *
 * There are two ways to use this class:
 * 
 * When using the {@link com.sleepycat.je} package directly, the static
 * methods in this class can be used to convert between primitive values and
 * {@link DatabaseEntry} objects.
 * When using the {@link com.sleepycat.collections} package, an instance of
 * this class can be used with any stored collection.  The easiest way to
 * obtain a binding instance is with the {@link
 * TupleBinding#getPrimitiveBinding} method.
 * 
 *
 * @see Integer Formats
 */
public class LongBinding extends TupleBinding {

    private static final int LONG_SIZE = 8;

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

        return input.readLong();
    }

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

        output.writeLong(object);
    }

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

        return sizedOutput();
    }

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

        return entryToInput(entry).readLong();
    }

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

        outputToEntry(sizedOutput().writeLong(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() {

        return new TupleOutput(new byte[LONG_SIZE]);
    }
}