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Core ACS AEM Commons OSGi Bundle. Includes commons utilities.
/*
* #%L
* ACS AEM Commons Bundle
* %%
* Copyright (C) 2013 Adobe
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
package com.adobe.acs.commons.models.injectors.impl;
import com.adobe.acs.commons.models.injectors.annotation.JsonValueMapValue;
import com.google.gson.Gson;
import org.apache.commons.lang3.StringUtils;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.models.spi.DisposalCallbackRegistry;
import org.apache.sling.models.spi.Injector;
import org.osgi.framework.Constants;
import org.osgi.service.component.annotations.Component;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import static com.adobe.acs.commons.models.injectors.impl.InjectorUtils.getResource;
import static com.adobe.acs.commons.util.impl.ReflectionUtil.getClassOrGenericParam;
import static com.adobe.acs.commons.util.impl.ReflectionUtil.getGenericParameter;
import static com.adobe.acs.commons.util.impl.ReflectionUtil.isArray;
import static com.adobe.acs.commons.util.impl.ReflectionUtil.isCollectionType;
import static com.adobe.acs.commons.util.impl.ReflectionUtil.isListType;
import static com.adobe.acs.commons.util.impl.ReflectionUtil.isSetType;
import static com.adobe.acs.commons.util.impl.ReflectionUtil.toArray;
import static org.apache.commons.lang3.ArrayUtils.isEmpty;
import static org.apache.commons.lang3.ArrayUtils.isNotEmpty;
import static org.apache.commons.lang3.StringUtils.defaultIfEmpty;
/**
* JsonValueMapValueInjector
* Injects a POJO into a field using GSON.
* Supports a list or a single value.
*/
@Component(
property = {
Constants.SERVICE_RANKING + ":Integer=5501"
},
service = Injector.class
)
public class JsonValueMapValueInjector implements Injector {
@Override
public String getName() {
return JsonValueMapValue.SOURCE;
}
private static final Gson GSON = new Gson();
@Override
public Object getValue(Object adaptable, String name, Type declaredType, AnnotatedElement element, DisposalCallbackRegistry callbackRegistry) {
if (element.isAnnotationPresent(JsonValueMapValue.class)) {
Resource resource = getResource(adaptable);
JsonValueMapValue annotation = element.getAnnotation(JsonValueMapValue.class);
String key = defaultIfEmpty(annotation.name(), name);
String[] jsonStringArray = resource.getValueMap().get(key, String[].class);
return parseValue(declaredType, jsonStringArray, key, resource);
}
return null;
}
private Object parseValue(Type declaredType,String[] jsonStringArray, String key, Resource resource){
if ((isSetType(declaredType)) && isNotEmpty(jsonStringArray)) {
return createSet(jsonStringArray, getGenericParameter(declaredType));
} else if ((isListType(declaredType) || isCollectionType(declaredType)) && isNotEmpty(jsonStringArray)) {
return createList(jsonStringArray, getGenericParameter(declaredType));
} else if (isArray(declaredType) && isNotEmpty(jsonStringArray)) {
return createArray(jsonStringArray, getGenericParameter(declaredType));
} else if (resource.getValueMap().containsKey(key)) {
String jsonString = resource.getValueMap().get(key, String.class);
return GSON.fromJson(jsonString, getClassOrGenericParam(declaredType));
} else {
return null;
}
}
private T[] createArray(String[] jsonStringList, Class targetClass) {
return toArray(createList(jsonStringList, targetClass));
}
private Set createSet(String[] jsonStringArray, Class targetClass) {
return new HashSet<>(createList(jsonStringArray, targetClass));
}
private List createList(String[] jsonStringArray, Class targetClass) {
if (isEmpty(jsonStringArray)) {
return Collections.emptyList();
}
List jsonStringList = Arrays.asList(jsonStringArray);
return jsonStringList.stream()
.map(json -> GSON.fromJson(json, targetClass))
.collect(Collectors.toList());
}
}