1 package org.apache.maven.surefire.util.internal;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.lang.management.ManagementFactory;
23 import java.util.Map;
24
25 /**
26 * Similar to Java 7 java.util.Objects.
27 *
28 * @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
29 * @since 2.20
30 */
31 public final class ObjectUtils
32 {
33 private ObjectUtils()
34 {
35 throw new IllegalStateException( "no instantiable constructor" );
36 }
37
38 public static <T> T useNonNull( T target, T fallback )
39 {
40 return isNull( target ) ? fallback : target;
41 }
42
43 /*
44 * In JDK7 use java.util.Objects instead.
45 * todo
46 * */
47 public static boolean isNull( Object target )
48 {
49 return target == null;
50 }
51
52 /*
53 * In JDK7 use java.util.Objects instead.
54 * todo
55 * */
56 public static boolean nonNull( Object target )
57 {
58 return !isNull( target );
59 }
60
61 /*
62 * In JDK7 use java.util.Objects instead.
63 * todo
64 * */
65 public static <T> T requireNonNull( T obj, String message )
66 {
67 if ( isNull( obj ) )
68 {
69 throw new NullPointerException( message );
70 }
71 return obj;
72 }
73
74 /*
75 * In JDK7 use java.util.Objects instead.
76 * todo
77 * */
78 public static <T> T requireNonNull( T obj )
79 {
80 return requireNonNull( obj, null );
81 }
82
83 public static Map<String, String> systemProps()
84 {
85 return ManagementFactory.getRuntimeMXBean().getSystemProperties();
86 }
87 }