1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2008 Google Inc. All rights reserved.
3 // https://developers.google.com/protocol-buffers/
4 //
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are
7 // met:
8 //
9 // * Redistributions of source code must retain the above copyright
10 // notice, this list of conditions and the following disclaimer.
11 // * Redistributions in binary form must reproduce the above
12 // copyright notice, this list of conditions and the following disclaimer
13 // in the documentation and/or other materials provided with the
14 // distribution.
15 // * Neither the name of Google Inc. nor the names of its
16 // contributors may be used to endorse or promote products derived from
17 // this software without specific prior written permission.
18 //
19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31 package com.google.protobuf.kotlin
32
33 /**
34 * A simple wrapper around a [Map] with an extra generic parameter that can be used to disambiguate
35 * extension methods.
36 *
37 * <p>This class is used by Kotlin protocol buffer extensions, and its constructor is public only
38 * because generated message code is in a different compilation unit. Others should not use this
39 * class directly in any way.
40 */
41 @Suppress("unused") // the unused type parameter
42 class DslMap<K, V, P : DslProxy>
43 @OnlyForUseByGeneratedProtoCode
<lambda>null44 constructor(private val delegate: Map<K, V>) : Map<K, V> by delegate {
45 // We allocate the wrappers on calls to get, not with lazy {...}, because lazy allocates
46 // a few objects up front, and any kind of query operation on this object should be rare.
47
48 override val entries: Set<Map.Entry<K, V>>
49 get() = UnmodifiableMapEntries(delegate.entries)
50
51 override val keys: Set<K>
52 get() = UnmodifiableSet(delegate.keys)
53
54 override val values: Collection<V>
55 get() = UnmodifiableCollection(delegate.values)
56
57 override fun equals(other: Any?): Boolean = delegate == other
58
59 override fun hashCode(): Int = delegate.hashCode()
60
61 override fun toString(): String = delegate.toString()
62 }
63
64 // TODO: investigate making this an inline class
65