Source Code Cross Referenced for SortedDoubleBinding.java in  » JMX » je » com » sleepycat » bind » tuple » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » JMX » je » com.sleepycat.bind.tuple 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*-
02:         * See the file LICENSE for redistribution information.
03:         *
04:         * Copyright (c) 2000,2008 Oracle.  All rights reserved.
05:         *
06:         * $Id: SortedDoubleBinding.java,v 1.4.2.2 2008/01/07 15:14:06 cwl Exp $
07:         */
08:
09:        package com.sleepycat.bind.tuple;
10:
11:        import com.sleepycat.je.DatabaseEntry;
12:
13:        /**
14:         * A concrete <code>TupleBinding</code> for a <code>Double</code> primitive
15:         * wrapper or a <code>double</code> primitive.
16:         *
17:         * <p>This class produces byte array values that by default (without a custom
18:         * comparator) sort correctly, including sorting of negative values.
19:         * Therefore, this class should normally be used instead of {@link
20:         * DoubleBinding} which does not by default support sorting of negative values.
21:         * Please note that:</p>
22:         * <ul>
23:         * <li>The byte array (stored) formats used by {@link DoubleBinding} and
24:         * {@link SortedDoubleBinding} are different and incompatible.  They are not
25:         * interchangable once data has been stored.</li>
26:         * <li>An instance of {@link DoubleBinding}, not {@link SortedDoubleBinding},
27:         * is returned by {@link TupleBinding#getPrimitiveBinding} method.  Therefore,
28:         * to use {@link SortedDoubleBinding}, {@link TupleBinding#getPrimitiveBinding}
29:         * should not be called.</li>
30:         * </ul>
31:         *
32:         * <p>There are two ways to use this class:</p>
33:         * <ol>
34:         * <li>When using the {@link com.sleepycat.je} package directly, the static
35:         * methods in this class can be used to convert between primitive values and
36:         * {@link DatabaseEntry} objects.</li>
37:         * <li>When using the {@link com.sleepycat.collections} package, an instance of
38:         * this class can be used with any stored collection.</li>
39:         * </ol>
40:         */
41:        public class SortedDoubleBinding extends TupleBinding {
42:
43:            /* javadoc is inherited */
44:            public Object entryToObject(TupleInput input) {
45:
46:                return new Double(input.readSortedDouble());
47:            }
48:
49:            /* javadoc is inherited */
50:            public void objectToEntry(Object object, TupleOutput output) {
51:
52:                output.writeSortedDouble(((Number) object).doubleValue());
53:            }
54:
55:            /* javadoc is inherited */
56:            protected TupleOutput getTupleOutput(Object object) {
57:
58:                return DoubleBinding.sizedOutput();
59:            }
60:
61:            /**
62:             * Converts an entry buffer into a simple <code>double</code> value.
63:             *
64:             * @param entry is the source entry buffer.
65:             *
66:             * @return the resulting value.
67:             */
68:            public static double entryToDouble(DatabaseEntry entry) {
69:
70:                return entryToInput(entry).readSortedDouble();
71:            }
72:
73:            /**
74:             * Converts a simple <code>double</code> value into an entry buffer.
75:             *
76:             * @param val is the source value.
77:             *
78:             * @param entry is the destination entry buffer.
79:             */
80:            public static void doubleToEntry(double val, DatabaseEntry entry) {
81:
82:                outputToEntry(DoubleBinding.sizedOutput()
83:                        .writeSortedDouble(val), entry);
84:            }
85:        }
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