001 /*
002 * Copyright 2008-2016 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.Context;
019 import griffon.exceptions.FieldException;
020 import griffon.inject.Contextual;
021
022 import javax.annotation.Nonnull;
023 import javax.annotation.Nullable;
024 import java.beans.PropertyDescriptor;
025 import java.beans.PropertyEditor;
026 import java.lang.reflect.Field;
027 import java.lang.reflect.InvocationTargetException;
028 import java.lang.reflect.Method;
029
030 import static griffon.core.editors.PropertyEditorResolver.findEditor;
031 import static griffon.util.AnnotationUtils.annotationsOfMethodParameter;
032 import static griffon.util.AnnotationUtils.findAnnotation;
033 import static griffon.util.AnnotationUtils.nameFor;
034 import static griffon.util.GriffonClassUtils.getAllDeclaredFields;
035 import static griffon.util.GriffonClassUtils.getPropertyDescriptors;
036 import static griffon.util.GriffonClassUtils.setFieldValue;
037 import static griffon.util.TypeUtils.castToBoolean;
038 import static griffon.util.TypeUtils.castToDouble;
039 import static griffon.util.TypeUtils.castToFloat;
040 import static griffon.util.TypeUtils.castToInt;
041 import static griffon.util.TypeUtils.castToLong;
042 import static java.util.Objects.requireNonNull;
043
044 /**
045 * @author Andres Almiray
046 * @since 2.2.0
047 */
048 public abstract class AbstractContext implements Context {
049 protected Context parentContext;
050
051 public AbstractContext(@Nullable Context parentContext) {
052 this.parentContext = parentContext;
053 }
054
055 @Nullable
056 public Context getParentContext() {
057 return parentContext;
058 }
059
060 @Nullable
061 @Override
062 @SuppressWarnings("unchecked")
063 public <T> T get(@Nonnull String key, @Nullable T defaultValue) {
064 T value = (T) get(key);
065 return value != null ? value : defaultValue;
066 }
067
068 @Nullable
069 @Override
070 public Object getAt(@Nonnull String key) {
071 return get(key);
072 }
073
074 @Nullable
075 @Override
076 public <T> T getAt(@Nonnull String key, @Nullable T defaultValue) {
077 return get(key, defaultValue);
078 }
079
080 @Nullable
081 @Override
082 public Object get(@Nonnull String key) {
083 if (hasKey(key)) {
084 return doGet(key);
085 } else if (parentContext != null) {
086 return parentContext.get(key);
087 } else {
088 return null;
089 }
090 }
091
092 @Override
093 public void destroy() {
094 parentContext = null;
095 }
096
097 @Override
098 public boolean containsKey(@Nonnull String key) {
099 if (hasKey(key)) {
100 return true;
101 } else if (parentContext != null) {
102 return parentContext.containsKey(key);
103 }
104 return false;
105 }
106
107 @Nullable
108 protected abstract Object doGet(@Nonnull String key);
109
110 @Override
111 public boolean getAsBoolean(@Nonnull String key) {
112 return getAsBoolean(key, false);
113 }
114
115 @Override
116 public boolean getAsBoolean(@Nonnull String key, boolean defaultValue) {
117 return castToBoolean(get(key), defaultValue);
118 }
119
120 @Override
121 public int getAsInt(@Nonnull String key) {
122 return getAsInt(key, 0);
123 }
124
125 @Override
126 public int getAsInt(@Nonnull String key, int defaultValue) {
127 return castToInt(get(key), defaultValue);
128 }
129
130 @Override
131 public long getAsLong(@Nonnull String key) {
132 return getAsLong(key, 0L);
133 }
134
135 @Override
136 public long getAsLong(@Nonnull String key, long defaultValue) {
137 return castToLong(get(key), defaultValue);
138 }
139
140 @Override
141 public float getAsFloat(@Nonnull String key) {
142 return getAsFloat(key, 0f);
143 }
144
145 @Override
146 public float getAsFloat(@Nonnull String key, float defaultValue) {
147 return castToFloat(get(key), defaultValue);
148 }
149
150 @Override
151 public double getAsDouble(@Nonnull String key) {
152 return getAsDouble(key, 0d);
153 }
154
155 @Override
156 public double getAsDouble(@Nonnull String key, double defaultValue) {
157 return castToDouble(get(key), defaultValue);
158 }
159
160 @Nullable
161 @Override
162 public String getAsString(@Nonnull String key) {
163 return getAsString(key, null);
164 }
165
166 @Nullable
167 @Override
168 public String getAsString(@Nonnull String key, @Nullable String defaultValue) {
169 Object value = get(key);
170 return value != null ? String.valueOf(value) : defaultValue;
171 }
172
173 @Nullable
174 @Override
175 @SuppressWarnings("unchecked")
176 public <T> T getAs(@Nonnull String key) {
177 return (T) get(key);
178 }
179
180 @Nullable
181 @Override
182 @SuppressWarnings("unchecked")
183 public <T> T getAs(@Nonnull String key, @Nullable T defaultValue) {
184 Object value = get(key);
185 return (T) (value != null ? value : defaultValue);
186 }
187
188 @Nullable
189 @Override
190 public <T> T getConverted(@Nonnull String key, @Nonnull Class<T> type) {
191 requireNonNull(type, "Argument 'type' must not be null");
192 return convertValue(get(key), type);
193 }
194
195 @Nullable
196 @Override
197 public <T> T getConverted(@Nonnull String key, @Nonnull Class<T> type, @Nullable T defaultValue) {
198 T value = getConverted(key, type);
199 return type.cast(value != null ? value : defaultValue);
200 }
201
202 @SuppressWarnings("unchecked")
203 protected <T> T convertValue(@Nullable Object value, @Nonnull Class<T> type) {
204 if (value != null) {
205 if (type.isAssignableFrom(value.getClass())) {
206 return (T) value;
207 } else {
208 PropertyEditor editor = findEditor(type);
209 editor.setValue(value);
210 return (T) editor.getValue();
211 }
212 }
213 return null;
214 }
215
216 @Nonnull
217 @Override
218 public <T> T injectMembers(@Nonnull T instance) {
219 requireNonNull(instance, "Argument 'instance' must not be null");
220
221 for (PropertyDescriptor descriptor : getPropertyDescriptors(instance.getClass())) {
222 Method method = descriptor.getWriteMethod();
223 if (method != null && method.getAnnotation(Contextual.class) != null) {
224 String key = nameFor(method);
225 Object arg = get(key);
226
227 Nonnull nonNull = findAnnotation(annotationsOfMethodParameter(method, 0), Nonnull.class);
228 if (arg == null && nonNull != null) {
229 throw new IllegalStateException("Could not find an instance of type " +
230 method.getParameterTypes()[0].getName() + " under key '" + key +
231 "' to be injected on property '" + descriptor.getName() +
232 "' (" + instance.getClass().getName() + "). Property does not accept null values.");
233 }
234
235 try {
236 method.invoke(instance, arg);
237 } catch (IllegalAccessException | InvocationTargetException e) {
238 throw new IllegalStateException(e);
239 }
240 }
241 }
242
243 for (Field field : getAllDeclaredFields(instance.getClass())) {
244 if (field.getAnnotation(Contextual.class) != null) {
245 String key = nameFor(field);
246 Object arg = get(key);
247 if (arg == null && field.getAnnotation(Nonnull.class) != null) {
248 throw new IllegalStateException("Could not find an instance of type " +
249 field.getType().getName() + " under key '" + key +
250 "' to be injected on field '" + field.getName() +
251 "' (" + instance.getClass().getName() + "). Field does not accept null values.");
252 }
253
254 try {
255 setFieldValue(instance, field.getName(), arg);
256 } catch (FieldException e) {
257 throw new IllegalStateException(e);
258 }
259 }
260 }
261
262 return instance;
263 }
264 }
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