001 /*
002 * Copyright 2008-2015 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 org.codehaus.griffon.runtime.core;
017
018 import griffon.core.Configuration;
019 import griffon.core.MutableConfiguration;
020 import griffon.util.AbstractMapResourceBundle;
021 import griffon.util.CompositeResourceBundle;
022 import griffon.util.ConfigUtils;
023
024 import javax.annotation.Nonnull;
025 import javax.annotation.Nullable;
026 import java.util.LinkedHashMap;
027 import java.util.LinkedHashSet;
028 import java.util.Map;
029 import java.util.MissingResourceException;
030 import java.util.ResourceBundle;
031 import java.util.Set;
032
033 import static griffon.util.ConfigUtils.getConfigValue;
034 import static griffon.util.GriffonNameUtils.requireNonBlank;
035 import static java.util.Arrays.asList;
036 import static java.util.Collections.unmodifiableMap;
037 import static java.util.Objects.requireNonNull;
038
039 /**
040 * @author Andres Almiray
041 * @since 2.2.0
042 */
043 public class DelegatingMutableConfiguration extends ConfigurationDecorator implements MutableConfiguration {
044 private static final String ERROR_KEY_BLANK = "Argument 'key' must not be blank";
045 private static final String ERROR_VALUE_NULL = "Argument 'value' must not be null";
046
047 private final Map<String, Object> mutableKeyValues = new LinkedHashMap<>();
048 private final Set<String> removedKeys = new LinkedHashSet<>();
049
050 public DelegatingMutableConfiguration(@Nonnull Configuration delegate) {
051 super(delegate);
052 }
053
054 @Override
055 public void set(@Nonnull String key, @Nonnull Object value) {
056 requireNonBlank(key, ERROR_KEY_BLANK);
057 requireNonNull(value, ERROR_VALUE_NULL);
058 mutableKeyValues.put(key, value);
059 }
060
061 @Nullable
062 @Override
063 public Object remove(@Nonnull String key) {
064 requireNonBlank(key, ERROR_KEY_BLANK);
065 if (mutableKeyValues.containsKey(key)) {
066 return mutableKeyValues.remove(key);
067 } else if (delegate.containsKey(key)) {
068 removedKeys.add(key);
069 return delegate.get(key);
070 }
071 return null;
072 }
073
074 @Nonnull
075 @Override
076 public Map<String, Object> asFlatMap() {
077 Map<String, Object> flatMap = new LinkedHashMap<>(delegate.asFlatMap());
078 flatMap.putAll(mutableKeyValues);
079 for (String removedKey : removedKeys) {
080 flatMap.remove(removedKey);
081 }
082 return unmodifiableMap(flatMap);
083 }
084
085 @Nonnull
086 @Override
087 public ResourceBundle asResourceBundle() {
088 return new CompositeResourceBundle(asList(new PrivateMapResourceBundle(asFlatMap()), delegate.asResourceBundle()));
089 }
090
091 @Nullable
092 @Override
093 public Object get(@Nonnull String key) {
094 requireNonBlank(key, ERROR_KEY_BLANK);
095 try {
096 return getConfigValue(mutableKeyValues, key);
097 } catch (MissingResourceException mre) {
098 if (removedKeys.contains(key)) {
099 return null;
100 }
101 return super.get(key);
102 }
103 }
104
105 @Override
106 public boolean containsKey(@Nonnull String key) {
107 requireNonBlank(key, ERROR_KEY_BLANK);
108 return ConfigUtils.containsKey(mutableKeyValues, key) || (!removedKeys.contains(key) && delegate.containsKey(key));
109 }
110
111 private static class PrivateMapResourceBundle extends AbstractMapResourceBundle {
112 private final Map<String, Object> map = new LinkedHashMap<>();
113
114 private PrivateMapResourceBundle(Map<String, Object> map) {
115 this.map.putAll(map);
116 initialize(entries);
117 initializeKeys();
118 }
119
120 @Override
121 protected void initialize(@Nonnull Map<String, Object> entries) {
122 if (map != null && entries != null) {
123 entries.putAll(map);
124 }
125 }
126 }
127 }
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