Source Code Cross Referenced for DoubleBinding.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: DoubleBinding.java,v 1.11.2.2 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><em>Note:</em> This class produces byte array values that by default
18:         * (without a custom comparator) do <em>not</em> sort correctly for negative
19:         * values.  Only non-negative values are sorted correctly by default.  To sort
20:         * all values correctly by default, use {@link SortedDoubleBinding}.</p>
21:         *
22:         * <p>There are two ways to use this class:</p>
23:         * <ol>
24:         * <li>When using the {@link com.sleepycat.je} package directly, the static
25:         * methods in this class can be used to convert between primitive values and
26:         * {@link DatabaseEntry} objects.</li>
27:         * <li>When using the {@link com.sleepycat.collections} package, an instance of
28:         * this class can be used with any stored collection.  The easiest way to
29:         * obtain a binding instance is with the {@link
30:         * TupleBinding#getPrimitiveBinding} method.</li>
31:         * </ol>
32:         */
33:        public class DoubleBinding extends TupleBinding {
34:
35:            private static final int DOUBLE_SIZE = 8;
36:
37:            // javadoc is inherited
38:            public Object entryToObject(TupleInput input) {
39:
40:                return new Double(input.readDouble());
41:            }
42:
43:            // javadoc is inherited
44:            public void objectToEntry(Object object, TupleOutput output) {
45:
46:                output.writeDouble(((Number) object).doubleValue());
47:            }
48:
49:            // javadoc is inherited
50:            protected TupleOutput getTupleOutput(Object object) {
51:
52:                return sizedOutput();
53:            }
54:
55:            /**
56:             * Converts an entry buffer into a simple <code>double</code> value.
57:             *
58:             * @param entry is the source entry buffer.
59:             *
60:             * @return the resulting value.
61:             */
62:            public static double entryToDouble(DatabaseEntry entry) {
63:
64:                return entryToInput(entry).readDouble();
65:            }
66:
67:            /**
68:             * Converts a simple <code>double</code> value into an entry buffer.
69:             *
70:             * @param val is the source value.
71:             *
72:             * @param entry is the destination entry buffer.
73:             */
74:            public static void doubleToEntry(double val, DatabaseEntry entry) {
75:
76:                outputToEntry(sizedOutput().writeDouble(val), entry);
77:            }
78:
79:            /**
80:             * Returns a tuple output object of the exact size needed, to avoid
81:             * wasting space when a single primitive is output.
82:             */
83:            static TupleOutput sizedOutput() {
84:
85:                return new TupleOutput(new byte[DOUBLE_SIZE]);
86:            }
87:        }
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