| /*- |
| * 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 <code>TupleBinding</code> for an unsorted <code>Double</code> |
| * primitive wrapper or an unsorted <code>double</code> primitive. |
| * |
| * <p>There are two ways to use this class:</p> |
| * <ol> |
| * <li>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.</li> |
| * <li>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.</li> |
| * </ol> |
| * |
| * @see <a href="package-summary.html#floatFormats">Floating Point Formats</a> |
| */ |
| public class DoubleBinding extends TupleBinding<Double> { |
| |
| private static final int DOUBLE_SIZE = 8; |
| |
| // javadoc is inherited |
| public Double entryToObject(TupleInput input) { |
| |
| return input.readDouble(); |
| } |
| |
| // javadoc is inherited |
| public void objectToEntry(Double object, TupleOutput output) { |
| |
| output.writeDouble(object); |
| } |
| |
| // javadoc is inherited |
| protected TupleOutput getTupleOutput(Double object) { |
| |
| return sizedOutput(); |
| } |
| |
| /** |
| * Converts an entry buffer into a simple <code>double</code> value. |
| * |
| * @param entry is the source entry buffer. |
| * |
| * @return the resulting value. |
| */ |
| public static double entryToDouble(DatabaseEntry entry) { |
| |
| return entryToInput(entry).readDouble(); |
| } |
| |
| /** |
| * Converts a simple <code>double</code> value into an entry buffer. |
| * |
| * @param val is the source value. |
| * |
| * @param entry is the destination entry buffer. |
| */ |
| public static void doubleToEntry(double val, DatabaseEntry entry) { |
| |
| outputToEntry(sizedOutput().writeDouble(val), entry); |
| } |
| |
| /** |
| * Returns a tuple output object of the exact size needed, to avoid |
| * wasting space when a single primitive is output. |
| */ |
| static TupleOutput sizedOutput() { |
| |
| return new TupleOutput(new byte[DOUBLE_SIZE]); |
| } |
| } |