/*
* Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. licenses this file to you 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.
*/
package org.wso2.carbon.event.publisher.core.internal.type.json;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import org.wso2.carbon.databridge.commons.Attribute;
import org.wso2.carbon.databridge.commons.StreamDefinition;
import org.wso2.carbon.event.publisher.core.config.EventPublisherConfiguration;
import org.wso2.carbon.event.publisher.core.config.EventPublisherConstants;
import org.wso2.carbon.event.publisher.core.config.mapping.JSONOutputMapping;
import org.wso2.carbon.event.publisher.core.exception.EventPublisherConfigurationException;
import org.wso2.carbon.event.publisher.core.internal.OutputMapper;
import org.wso2.carbon.event.publisher.core.internal.util.EventPublisherUtil;
import org.wso2.carbon.event.publisher.core.internal.util.RuntimeResourceLoader;
import org.wso2.siddhi.core.event.Event;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class JSONOutputMapper implements OutputMapper {
private List<String> mappingTextList;
private EventPublisherConfiguration eventPublisherConfiguration = null;
private Map<String, Integer> propertyPositionMap = null;
private final StreamDefinition streamDefinition;
private boolean isCustomRegistryPath;
private final RuntimeResourceLoader runtimeResourceLoader;
private final boolean isCustomMappingEnabled;
private final String mappingText;
public JSONOutputMapper(EventPublisherConfiguration eventPublisherConfiguration,
Map<String, Integer> propertyPositionMap, int tenantId,
StreamDefinition streamDefinition)
throws EventPublisherConfigurationException {
this.eventPublisherConfiguration = eventPublisherConfiguration;
this.propertyPositionMap = propertyPositionMap;
this.streamDefinition = streamDefinition;
JSONOutputMapping outputMapping = (JSONOutputMapping) eventPublisherConfiguration.getOutputMapping();
this.runtimeResourceLoader = new RuntimeResourceLoader(outputMapping.getCacheTimeoutDuration(), propertyPositionMap);
this.isCustomMappingEnabled = outputMapping.isCustomMappingEnabled();
if (this.isCustomMappingEnabled) {
this.mappingText = getCustomMappingText();
} else {
this.mappingText = generateJsonEventTemplate(streamDefinition);
}
if (!outputMapping.isRegistryResource()) { // Store only if it is not from registry
this.mappingTextList = generateMappingTextList(this.mappingText);
}
}
private List<String> generateMappingTextList(String mappingText) throws EventPublisherConfigurationException {
List<String> mappingTextList = new ArrayList<String>();
String text = mappingText;
int prefixIndex = text.indexOf(EventPublisherConstants.TEMPLATE_EVENT_ATTRIBUTE_PREFIX);
int postFixIndex;
while (prefixIndex > 0) {
postFixIndex = text.indexOf(EventPublisherConstants.TEMPLATE_EVENT_ATTRIBUTE_POSTFIX);
if (postFixIndex > prefixIndex) {
mappingTextList.add(text.substring(0, prefixIndex));
mappingTextList.add(text.substring(prefixIndex + 2, postFixIndex));
text = text.substring(postFixIndex + 2);
} else {
throw new EventPublisherConfigurationException("Found template attribute prefix " + EventPublisherConstants.TEMPLATE_EVENT_ATTRIBUTE_PREFIX
+ " without corresponding postfix " + EventPublisherConstants.TEMPLATE_EVENT_ATTRIBUTE_POSTFIX + ". Please verify your JSON template.");
}
prefixIndex = text.indexOf(EventPublisherConstants.TEMPLATE_EVENT_ATTRIBUTE_PREFIX);
}
mappingTextList.add(text);
return mappingTextList;
}
@Override
public Object convertToMappedInputEvent(Event event)
throws EventPublisherConfigurationException {
if (this.isCustomMappingEnabled) {
EventPublisherUtil.validateStreamDefinitionWithOutputProperties(mappingText, propertyPositionMap, event.getArbitraryDataMap());
}
// Retrieve resource at runtime if it is from registry
JSONOutputMapping outputMapping = (JSONOutputMapping) eventPublisherConfiguration.getOutputMapping();
if (outputMapping.isRegistryResource()) {
String path = outputMapping.getMappingText();
if (isCustomRegistryPath) {
// Retrieve the actual path
List<String> pathMappingTextList = generateMappingTextList(path);
StringBuilder pathBuilder = new StringBuilder(pathMappingTextList.get(0));
for (int i = 1; i < pathMappingTextList.size(); i++) {
if (i % 2 == 0) {
pathBuilder.append(pathMappingTextList.get(i));
} else {
pathBuilder.append(getPropertyValue(event, pathMappingTextList.get(i)));
}
}
path = pathBuilder.toString();
}
// Retrieve actual content
String actualMappingText = this.runtimeResourceLoader.getResourceContent(path);
this.mappingTextList = generateMappingTextList(actualMappingText);
}
StringBuilder eventText = new StringBuilder(mappingTextList.get(0));
for (int i = 1, size = mappingTextList.size(); i < size; i++) {
if (i % 2 == 0) {
eventText.append(mappingTextList.get(i));
} else {
Object propertyValue = getPropertyValue(event, mappingTextList.get(i));
if (propertyValue != null && propertyValue instanceof String) {
eventText.append(EventPublisherConstants.DOUBLE_QUOTE)
.append(propertyValue)
.append(EventPublisherConstants.DOUBLE_QUOTE);
} else {
eventText.append(propertyValue);
}
}
}
String text = eventText.toString();
if (!this.isCustomMappingEnabled) {
Map<String, Object> arbitraryDataMap = event.getArbitraryDataMap();
if (arbitraryDataMap != null && !arbitraryDataMap.isEmpty()) {
Gson gson = new Gson();
JsonParser parser = new JsonParser();
JsonObject jsonObject = parser.parse(text).getAsJsonObject();
jsonObject.getAsJsonObject(EventPublisherConstants.EVENT_PARENT_TAG).add(EventPublisherConstants.EVENT_ARBITRARY_DATA_MAP_TAG, gson.toJsonTree(arbitraryDataMap));
text = gson.toJson(jsonObject);
}
}
return text;
}
@Override
public Object convertToTypedInputEvent(Event event)
throws EventPublisherConfigurationException {
return convertToMappedInputEvent(event);
}
private String getCustomMappingText() throws EventPublisherConfigurationException {
JSONOutputMapping jsonOutputMapping = ((JSONOutputMapping) eventPublisherConfiguration.getOutputMapping());
String actualMappingText = jsonOutputMapping.getMappingText();
if (actualMappingText == null) {
throw new EventPublisherConfigurationException("Json mapping text is empty!");
}
if (jsonOutputMapping.isRegistryResource()) {
this.isCustomRegistryPath = actualMappingText.contains(EventPublisherConstants.TEMPLATE_EVENT_ATTRIBUTE_PREFIX) && actualMappingText.indexOf(EventPublisherConstants.TEMPLATE_EVENT_ATTRIBUTE_POSTFIX) > 0;
if (!this.isCustomRegistryPath) {
actualMappingText = this.runtimeResourceLoader.getResourceContent(jsonOutputMapping.getMappingText());
}
}
return actualMappingText;
}
private Object getPropertyValue(Event event, String mappingProperty) {
Object[] eventData = event.getData();
Map<String, Object> arbitraryMap = event.getArbitraryDataMap();
Integer position = propertyPositionMap.get(mappingProperty);
Object data = null;
if (position != null && eventData.length != 0) {
data = eventData[position];
} else if (mappingProperty != null && arbitraryMap != null && arbitraryMap.containsKey(mappingProperty)) {
data = arbitraryMap.get(mappingProperty);
}
return data;
}
private String generateJsonEventTemplate(StreamDefinition streamDefinition) {
JsonObject jsonEventObject = new JsonObject();
JsonObject innerParentObject = new JsonObject();
List<Attribute> metaDatAttributes = streamDefinition.getMetaData();
if (metaDatAttributes != null && metaDatAttributes.size() > 0) {
innerParentObject.add(EventPublisherConstants.EVENT_META_TAG, createPropertyElement(EventPublisherConstants.PROPERTY_META_PREFIX, metaDatAttributes));
}
List<Attribute> correlationAttributes = streamDefinition.getCorrelationData();
if (correlationAttributes != null && correlationAttributes.size() > 0) {
innerParentObject.add(EventPublisherConstants.EVENT_CORRELATION_TAG, createPropertyElement(EventPublisherConstants.PROPERTY_CORRELATION_PREFIX, correlationAttributes));
}
List<Attribute> payloadAttributes = streamDefinition.getPayloadData();
if (payloadAttributes != null && payloadAttributes.size() > 0) {
innerParentObject.add(EventPublisherConstants.EVENT_PAYLOAD_TAG, createPropertyElement("", payloadAttributes));
}
jsonEventObject.add(EventPublisherConstants.EVENT_PARENT_TAG, innerParentObject);
String defaultMapping = jsonEventObject.toString();
defaultMapping = defaultMapping.replaceAll("\"\\{\\{", "{{");
defaultMapping = defaultMapping.replaceAll("\\}\\}\"", "}}");
return defaultMapping;
}
private static JsonObject createPropertyElement(String dataPrefix,
List<Attribute> attributeList) {
JsonObject innerObject = new JsonObject();
for (Attribute attribute : attributeList) {
innerObject.addProperty(attribute.getName(), EventPublisherConstants.TEMPLATE_EVENT_ATTRIBUTE_PREFIX + dataPrefix + attribute.getName() + EventPublisherConstants.TEMPLATE_EVENT_ATTRIBUTE_POSTFIX);
}
return innerObject;
}
}