01 /*
02 * SPDX-License-Identifier: Apache-2.0
03 *
04 * Copyright 2008-2017 the original author or authors.
05 *
06 * Licensed under the Apache License, Version 2.0 (the "License");
07 * you may not use this file except in compliance with the License.
08 * You may obtain a copy of the License at
09 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package griffon.core.injection;
19
20 import javax.annotation.Nonnull;
21 import javax.annotation.Nullable;
22 import java.lang.annotation.Annotation;
23
24 import static java.util.Objects.requireNonNull;
25
26 /**
27 * @author Andres Almiray
28 * @since 2.0.0
29 */
30 public final class Qualified<T> {
31 private Annotation qualifier;
32 private final T instance;
33
34 public Qualified(@Nonnull T instance, @Nullable Annotation qualifier) {
35 this.instance = requireNonNull(instance, "Argument 'instance' must not be null");
36 this.qualifier = qualifier;
37 }
38
39 @Nullable
40 public Annotation getQualifier() {
41 return qualifier;
42 }
43
44 @Nonnull
45 public T getInstance() {
46 return instance;
47 }
48
49 @Override
50 public boolean equals(Object o) {
51 if (this == o) return true;
52 if (o == null || getClass() != o.getClass()) return false;
53
54 Qualified that = (Qualified) o;
55
56 return instance.equals(that.instance) &&
57 !(qualifier != null ? !qualifier.equals(that.qualifier) : that.qualifier != null);
58 }
59
60 @Override
61 public int hashCode() {
62 int result = qualifier != null ? qualifier.hashCode() : 0;
63 result = 31 * result + instance.hashCode();
64 return result;
65 }
66
67 @Override
68 public String toString() {
69 final StringBuilder sb = new StringBuilder("Qualified{");
70 sb.append("qualifier=").append(qualifier);
71 sb.append(", instance=").append(instance);
72 sb.append('}');
73 return sb.toString();
74 }
75 }
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