001 /*
002 * Copyright 2008-2017 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package griffon.core.injection;
017
018 import javax.annotation.Nonnull;
019 import javax.annotation.Nullable;
020 import java.lang.annotation.Annotation;
021
022 import static java.util.Objects.requireNonNull;
023
024 /**
025 * @author Andres Almiray
026 * @since 2.7.0
027 */
028 public class Key<T> {
029 private static final String ERROR_SOURCE_NULL = "Argument 'source' must not be null";
030 private static final String ERROR_ANNOTATION_NULL = "Argument 'annotation' must not be null";
031 private static final String ERROR_ANNOTATION_TYPE_NULL = "Argument 'annotationType' must not be null";
032
033 private final Class<T> source;
034 private Class<? extends Annotation> annotationType;
035 private Annotation annotation;
036
037 private Key(@Nonnull Class<T> source) {
038 this.source = requireNonNull(source, ERROR_SOURCE_NULL);
039 }
040
041 private Key(@Nonnull Class<T> source, @Nonnull Annotation annotation) {
042 this.source = requireNonNull(source, ERROR_SOURCE_NULL);
043 this.annotation = requireNonNull(annotation, ERROR_ANNOTATION_NULL);
044 this.annotationType = annotation.getClass();
045 }
046
047 private Key(@Nonnull Class<T> source, @Nonnull Class<? extends Annotation> annotationType) {
048 this.source = requireNonNull(source, ERROR_SOURCE_NULL);
049 this.annotationType = requireNonNull(annotationType, ERROR_ANNOTATION_TYPE_NULL);
050 }
051
052 @Nonnull
053 public Class<?> getSource() {
054 return source;
055 }
056
057 @Nullable
058 public Class<? extends Annotation> getAnnotationType() {
059 return annotationType;
060 }
061
062 @Nullable
063 public Annotation getAnnotation() {
064 return annotation;
065 }
066
067 @Override
068 public boolean equals(Object o) {
069 if (this == o) { return true; }
070 if (o == null || getClass() != o.getClass()) { return false; }
071
072 Key key = (Key) o;
073
074 if (annotation != null) {
075 return source.equals(key.source) && annotation.equals(key.annotation);
076 }
077
078 return source.equals(key.source) &&
079 !(annotationType != null ? !annotationType.equals(key.annotationType) : key.annotationType != null);
080 }
081
082 @Override
083 public int hashCode() {
084 int result = source.hashCode();
085 if (annotation != null) {
086 result = 31 * result + annotation.hashCode();
087 } else {
088 result = 31 * result + (annotationType != null ? annotationType.hashCode() : 0);
089 }
090 return result;
091 }
092
093 @Override
094 public String toString() {
095 final StringBuilder sb = new StringBuilder("Key{");
096 sb.append("source=").append(source);
097 sb.append(", annotation=").append(annotation);
098 sb.append(", annotationType=").append(annotationType);
099 sb.append('}');
100 return sb.toString();
101 }
102
103 @Nonnull
104 public static <T> Key<T> of(@Nonnull Class<T> source) {
105 return new Key<>(source);
106 }
107
108 @Nonnull
109 public static <T> Key<T> of(@Nonnull Class<T> source, @Nonnull Annotation annotation) {
110 return new Key<>(source, annotation);
111 }
112
113 @Nonnull
114 public static <T> Key<T> of(@Nonnull Class<T> source, @Nonnull Class<? extends Annotation> annotationType) {
115 return new Key<>(source, annotationType);
116 }
117
118 @Nonnull
119 public static <T> Key<T> of(@Nonnull Binding<T> binding) {
120 return binding.getClassifier() != null ? new Key<>(binding.getSource(), binding.getClassifier()) :
121 (binding.getClassifierType() != null ? new Key<>(binding.getSource(), binding.getClassifierType()) : new Key<>(binding.getSource()));
122 }
123 }
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