1/*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 *   - Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 *
11 *   - Redistributions in binary form must reproduce the above copyright
12 *     notice, this list of conditions and the following disclaimer in the
13 *     documentation and/or other materials provided with the distribution.
14 *
15 *   - Neither the name of Oracle nor the names of its
16 *     contributors may be used to endorse or promote products derived
17 *     from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * This source code is provided to illustrate the usage of a given feature
34 * or technique and has been deliberately simplified. Additional steps
35 * required for a production-quality application, such as security checks,
36 * input validation and proper error handling, might not be present in
37 * this sample code.
38 */
39import javax.xml.bind.ValidationException;
40import java.util.function.Supplier;
41
42/**
43 * Enum of Validator implementations.
44 */
45public enum Validator {
46
47    /**
48     * This validator checks that the string represents an integer.
49     */
50    INTEGER_NUMBER {
51                /**
52                 * Checks that the string represents an integer.
53                 *
54                 * @param string - a string supplier
55                 * @throws ValidationException if the validation check fails
56                 */
57                @Override
58                void validate(Supplier<?> string) throws ValidationException {
59                    try {
60                        Integer.parseInt((String) string.get());
61                    } catch (NumberFormatException ex) {
62                        throw new ValidationException("Error while validating "
63                                + string.get());
64                    }
65                }
66            },
67    /**
68     * This validator checks that the string represents a positive number.
69     */
70    POSITIVE_NUMBER {
71                /**
72                 * Checks that the string represents a positive number.
73                 *
74                 * @param string - an string supplier
75                 * @throws ValidationException if the validation check fails
76                 */
77                @Override
78                void validate(Supplier<?> string) throws ValidationException {
79                    try {
80                        if (Double.compare(0.0, Double.parseDouble(
81                                        (String) string.get())) > 0) {
82                            throw new Exception();
83                        }
84                    } catch (Exception ex) {
85                        throw new ValidationException("Error while validating "
86                                + string.get());
87                    }
88                }
89            };
90
91    /**
92     * Checks that the supplier is valid.
93     *
94     * @param string - a string supplier
95     * @throws ValidationException if validation check fails
96     */
97    abstract void validate(Supplier<?> string) throws ValidationException;
98
99}
100