1 /**
2 * Copyright (c) 2013-2023, jcabi.com
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met: 1) Redistributions of source code must retain the above
8 * copyright notice, this list of conditions and the following
9 * disclaimer. 2) Redistributions in binary form must reproduce the above
10 * copyright notice, this list of conditions and the following
11 * disclaimer in the documentation and/or other materials provided
12 * with the distribution. 3) Neither the name of the jcabi.com nor
13 * the names of its contributors may be used to endorse or promote
14 * products derived from this software without specific prior written
15 * permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
19 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
28 * OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30 package com.jcabi.github;
31
32 import com.jcabi.aspects.Immutable;
33 import com.jcabi.aspects.Loggable;
34 import java.io.IOException;
35 import lombok.EqualsAndHashCode;
36
37 /**
38 * Check if a Github JSON object actually exists on the server.
39 *
40 * @author Mihai Andronache (amihaiemil@gmail.com)
41 * @version $Id: 901a3bc26b9c334a895d229a5aa19927b3f73970 $
42 * @since 0.38
43 */
44 @Immutable
45 @Loggable(Loggable.DEBUG)
46 @EqualsAndHashCode(of = "readable")
47 final class Existence {
48
49 /**
50 * Checked object.
51 */
52 private final transient JsonReadable readable;
53
54 /**
55 * Ctor.
56 * @param rdbl Checked object.
57 */
58 Existence(final JsonReadable rdbl) {
59 this.readable = rdbl;
60 }
61
62 /**
63 * Check existence.
64 * @return True if exists, false otherwise.
65 * @throws IOException If there is a networking problem.
66 */
67 public boolean check() throws IOException {
68 boolean exists = true;
69 try {
70 this.readable.json();
71 } catch (final AssertionError ex) {
72 exists = false;
73 } catch (final IndexOutOfBoundsException ex) {
74 exists = false;
75 }
76 return exists;
77 }
78
79 }