01 /*
02 * Copyright 2008-2016 the original author or authors.
03 *
04 * Licensed under the Apache License, Version 2.0 (the "License");
05 * you may not use this file except in compliance with the License.
06 * You may obtain a copy of the License at
07 *
08 * http://www.apache.org/licenses/LICENSE-2.0
09 *
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 package griffon.util;
17
18 import javax.annotation.Nonnull;
19 import javax.annotation.Nullable;
20 import java.util.Enumeration;
21 import java.util.Iterator;
22 import java.util.LinkedHashMap;
23 import java.util.Map;
24 import java.util.ResourceBundle;
25 import java.util.Set;
26
27 import static griffon.util.ConfigUtils.collectKeys;
28 import static griffon.util.ConfigUtils.getConfigValue;
29 import static griffon.util.GriffonNameUtils.requireNonBlank;
30
31 /**
32 * @author Andres Almiray
33 * @since 2.0.0
34 */
35 public abstract class AbstractMapResourceBundle extends ResourceBundle {
36 protected final Map<String, Object> entries = new LinkedHashMap<>();
37 protected volatile Set<String> keys;
38
39 public AbstractMapResourceBundle() {
40 initialize(entries);
41 initializeKeys();
42 }
43
44 protected abstract void initialize(@Nonnull Map<String, Object> entries);
45
46 protected void initializeKeys() {
47 keys = collectKeys(entries);
48 }
49
50 @Nullable
51 @Override
52 protected final Object handleGetObject(@Nonnull String key) {
53 return getConfigValue(entries, requireNonBlank(key, "Argument 'key' must not be blank"));
54 }
55
56 @Nonnull
57 @Override
58 public final Enumeration<String> getKeys() {
59 return new IteratorAsEnumeration<>(keys.iterator());
60 }
61
62 @Override
63 public Set<String> keySet() {
64 return keys;
65 }
66
67 @Override
68 protected Set<String> handleKeySet() {
69 return keys;
70 }
71
72 private static class IteratorAsEnumeration<E> implements Enumeration<E> {
73 private final Iterator<E> iterator;
74
75 public IteratorAsEnumeration(Iterator<E> iterator) {
76 this.iterator = iterator;
77 }
78
79 public boolean hasMoreElements() {
80 return iterator.hasNext();
81 }
82
83 public E nextElement() {
84 return iterator.next();
85 }
86 }
87 }
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