1 /*
 2  * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.  Oracle designates this
 8  * particular file as subject to the "Classpath" exception as provided
 9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
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19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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24  */
25 
26 package oracle.code.json;
27 
28 import oracle.code.json.impl.JsonNullImpl;
29 
30 /**
31  * The interface that represents JSON null.
32  * <p>
33  * A {@code JsonNull} can be produced by {@link Json#parse(String)}.
34  * <p> Alternatively, {@link #of()} can be used to obtain a {@code JsonNull}.
35  *
36  * @since 99
37  */
38 public non-sealed interface JsonNull extends JsonValue {
39 
40     /**
41      * {@return the {@code JsonNull} that represents a "null" JSON value}
42      */
43     static JsonNull of() {
44         return JsonNullImpl.NULL;
45     }
46 
47     /**
48      * {@return true if the given {@code obj} is a {@code JsonNull}}
49      */
50     @Override
51     boolean equals(Object obj);
52 
53     /**
54      * {@return the hash code value of this {@code JsonNull}}
55      */
56     @Override
57     int hashCode();
58 }