1 /*
2  * Copyright (C) 2010 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package libcore.util;
18 
19 import static android.annotation.SystemApi.Client.MODULE_LIBRARIES;
20 
21 import android.annotation.SystemApi;
22 import android.compat.annotation.UnsupportedAppUsage;
23 import dalvik.annotation.compat.VersionCodes;
24 
25 import java.lang.annotation.Annotation;
26 
27 /**
28  * Empty array is immutable. Use a shared empty array to avoid allocation.
29  *
30  * @hide
31  */
32 @SystemApi(client = MODULE_LIBRARIES)
33 public final class EmptyArray {
EmptyArray()34     private EmptyArray() {}
35 
36     /** @hide */
37     @SystemApi(client = MODULE_LIBRARIES)
38     public static final @NonNull boolean[] BOOLEAN = new boolean[0];
39 
40     /** @hide */
41     @UnsupportedAppUsage(maxTargetSdk=VersionCodes.Q,
42             publicAlternatives="Use {@code new byte[0]} instead.")
43     @SystemApi(client = MODULE_LIBRARIES)
44     public static final @NonNull byte[] BYTE = new byte[0];
45 
46     /** @hide */
47     public static final char[] CHAR = new char[0];
48 
49     /** @hide */
50     public static final double[] DOUBLE = new double[0];
51 
52     /** @hide */
53     @SystemApi(client = MODULE_LIBRARIES)
54     public static final @NonNull float[] FLOAT = new float[0];
55 
56     /** @hide */
57     @UnsupportedAppUsage(maxTargetSdk=VersionCodes.Q,
58             publicAlternatives="Use {@code new int[0]} instead.")
59     @SystemApi(client = MODULE_LIBRARIES)
60     public static final @NonNull int[] INT = new int[0];
61 
62     /** @hide */
63     @UnsupportedAppUsage(maxTargetSdk=VersionCodes.Q,
64             publicAlternatives="Use {@code new long[0]} instead.")
65     @SystemApi(client = MODULE_LIBRARIES)
66     public static final @NonNull long[] LONG = new long[0];
67 
68     /** @hide */
69     public static final Class<?>[] CLASS = new Class[0];
70 
71     /** @hide */
72     @UnsupportedAppUsage(maxTargetSdk=VersionCodes.Q,
73             publicAlternatives="Use {@code new Object[0]} instead.")
74     @SystemApi(client = MODULE_LIBRARIES)
75     public static final @NonNull Object[] OBJECT = new Object[0];
76 
77     /** @hide */
78     @SystemApi(client = MODULE_LIBRARIES)
79     public static final @NonNull String[] STRING = new String[0];
80 
81     /** @hide */
82     public static final Throwable[] THROWABLE = new Throwable[0];
83 
84     /** @hide */
85     public static final StackTraceElement[] STACK_TRACE_ELEMENT = new StackTraceElement[0];
86 
87     /** @hide */
88     public static final java.lang.reflect.Type[] TYPE = new java.lang.reflect.Type[0];
89 
90     /** @hide */
91     public static final java.lang.reflect.TypeVariable[] TYPE_VARIABLE =
92         new java.lang.reflect.TypeVariable[0];
93     /** @hide */
94     public static final Annotation[] ANNOTATION = new Annotation[0];
95 }
96