/*
* Copyright (c) 2005 - 2014, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* 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.
*/
package org.wso2.carbon.event.receiver.core.internal.type.json;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMFactory;
import org.wso2.carbon.databridge.commons.AttributeType;
import org.wso2.carbon.event.receiver.core.config.EventReceiverConstants;
import org.wso2.carbon.event.receiver.core.config.InputMapping;
import org.wso2.carbon.event.receiver.core.config.InputMappingAttribute;
import org.wso2.carbon.event.receiver.core.config.mapping.JSONInputMapping;
import org.wso2.carbon.event.receiver.core.exception.EventReceiverConfigurationException;
import org.wso2.carbon.event.receiver.core.internal.util.EventReceiverConfigurationBuilder;
import javax.xml.namespace.QName;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* This class is used to read the values of the event receiver configuration defined in XML configuration files
*/
public class JSONInputMapperConfigurationBuilder {
private static JSONInputMapperConfigurationBuilder instance = new JSONInputMapperConfigurationBuilder();
private JSONInputMapperConfigurationBuilder() {
}
public static JSONInputMapperConfigurationBuilder getInstance() {
return JSONInputMapperConfigurationBuilder.instance;
}
public OMElement inputMappingToOM(
InputMapping inputMapping, OMFactory factory) {
JSONInputMapping jsonInputMapping = (JSONInputMapping) inputMapping;
OMElement mappingOMElement = factory.createOMElement(new QName(EventReceiverConstants.ER_ELEMENT_MAPPING));
mappingOMElement.declareDefaultNamespace(EventReceiverConstants.ER_CONF_NS);
mappingOMElement.addAttribute(EventReceiverConstants.ER_ATTR_TYPE, EventReceiverConstants.ER_JSON_MAPPING_TYPE, null);
if (jsonInputMapping.isCustomMappingEnabled()) {
mappingOMElement.addAttribute(EventReceiverConstants.ER_ATTR_CUSTOM_MAPPING_ENABLED, EventReceiverConstants.ENABLE_CONST, null);
} else {
mappingOMElement.addAttribute(EventReceiverConstants.ER_ATTR_CUSTOM_MAPPING_ENABLED, EventReceiverConstants.DISABLE_CONST, null);
}
for (InputMappingAttribute inputMappingAttribute : jsonInputMapping.getInputMappingAttributes()) {
OMElement propertyOMElement = getPropertyOmElement(factory, inputMappingAttribute);
propertyOMElement.setNamespace(mappingOMElement.getDefaultNamespace());
mappingOMElement.addChild(propertyOMElement);
}
return mappingOMElement;
}
private InputMappingAttribute getInputMappingAttributeFromOM(OMElement omElement) {
OMElement propertyFromElement = omElement.getFirstChildWithName(new QName(EventReceiverConstants.ER_CONF_NS, EventReceiverConstants.ER_ELEMENT_FROM));
OMElement propertyToElement = omElement.getFirstChildWithName(new QName(EventReceiverConstants.ER_CONF_NS, EventReceiverConstants.ER_ELEMENT_TO));
String jsonPath = propertyFromElement.getAttributeValue(new QName(EventReceiverConstants.ER_ATTR_JSONPATH));
String outputPropertyName = propertyToElement.getAttributeValue(new QName(EventReceiverConstants.ER_ATTR_NAME));
String attributeType = propertyToElement.getAttributeValue(new QName(EventReceiverConstants.ER_ATTR_TYPE));
AttributeType outputPropertyType = EventReceiverConstants.STRING_ATTRIBUTE_TYPE_MAP.get(attributeType.toLowerCase());
String defaultValue = propertyToElement.getAttributeValue(new QName(EventReceiverConstants.ER_ATTR_DEFAULT_VALUE));
InputMappingAttribute inputMappingAttribute = new InputMappingAttribute(jsonPath, outputPropertyName, outputPropertyType);
inputMappingAttribute.setDefaultValue(defaultValue);
return inputMappingAttribute;
}
private OMElement getPropertyOmElement(OMFactory factory,
InputMappingAttribute inputMappingAttribute) {
OMElement propertyOmElement = factory.createOMElement(new QName(EventReceiverConstants.ER_ELEMENT_PROPERTY));
OMElement fromElement = factory.createOMElement(new QName(EventReceiverConstants.ER_ELEMENT_FROM));
fromElement.declareDefaultNamespace(EventReceiverConstants.ER_CONF_NS);
fromElement.addAttribute(EventReceiverConstants.ER_ATTR_JSONPATH, inputMappingAttribute.getFromElementKey(), null);
OMElement toElement = factory.createOMElement(new QName(EventReceiverConstants.ER_ELEMENT_TO));
toElement.declareDefaultNamespace(EventReceiverConstants.ER_CONF_NS);
toElement.addAttribute(EventReceiverConstants.ER_ATTR_NAME, inputMappingAttribute.getToElementKey(), null);
toElement.addAttribute(EventReceiverConstants.ER_ATTR_TYPE, EventReceiverConfigurationBuilder.getAttributeType(inputMappingAttribute.getToElementType()), null);
if (inputMappingAttribute.getDefaultValue() != null && !inputMappingAttribute.getDefaultValue().isEmpty()) {
toElement.addAttribute(EventReceiverConstants.ER_ATTR_DEFAULT_VALUE, inputMappingAttribute.getDefaultValue(), null);
}
propertyOmElement.addChild(fromElement);
propertyOmElement.addChild(toElement);
return propertyOmElement;
}
public InputMapping fromOM(
OMElement mappingElement)
throws EventReceiverConfigurationException {
JSONInputMapperConfigurationBuilder.validateJsonEventMapping(mappingElement);
JSONInputMapping jsonInputMapping = new JSONInputMapping();
String customMappingEnabledAttribute = mappingElement.getAttributeValue(new QName(EventReceiverConstants.ER_ATTR_CUSTOM_MAPPING_ENABLED));
if (customMappingEnabledAttribute == null || customMappingEnabledAttribute.equalsIgnoreCase(EventReceiverConstants.ENABLE_CONST)) {
jsonInputMapping.setCustomMappingEnabled(true);
Iterator propertyIterator = mappingElement.getChildrenWithName(new QName(EventReceiverConstants.ER_CONF_NS, EventReceiverConstants.ER_ELEMENT_PROPERTY));
while (propertyIterator.hasNext()) {
OMElement propertyOMElement = (OMElement) propertyIterator.next();
InputMappingAttribute inputMappingAttribute = getInputMappingAttributeFromOM(propertyOMElement);
jsonInputMapping.addInputMappingAttribute(inputMappingAttribute);
}
}else{
jsonInputMapping.setCustomMappingEnabled(false);
}
return jsonInputMapping;
}
@SuppressWarnings("unchecked")
public static void validateJsonEventMapping(OMElement omElement)
throws EventReceiverConfigurationException {
String customMappingEnabledAttribute = omElement.getAttributeValue(new QName(EventReceiverConstants.ER_ATTR_CUSTOM_MAPPING_ENABLED));
if (customMappingEnabledAttribute == null || customMappingEnabledAttribute.equalsIgnoreCase(EventReceiverConstants.ENABLE_CONST)) {
List<String> supportedChildTags = new ArrayList<String>();
supportedChildTags.add(EventReceiverConstants.ER_ELEMENT_PROPERTY);
Iterator<OMElement> mappingIterator = omElement.getChildElements();
int count = 0;
while (mappingIterator.hasNext()) {
count++;
OMElement childElement = mappingIterator.next();
String childTag = childElement.getLocalName();
if (!supportedChildTags.contains(childTag)) {
throw new EventReceiverConfigurationException("Unsupported XML configuration element for JSON Input Mapping : " + childTag);
}
if (childTag.equals(EventReceiverConstants.ER_ELEMENT_PROPERTY)) {
OMElement propertyFromElement = childElement.getFirstChildWithName(new QName(EventReceiverConstants.ER_CONF_NS, EventReceiverConstants.ER_ELEMENT_FROM));
OMElement propertyToElement = childElement.getFirstChildWithName(new QName(EventReceiverConstants.ER_CONF_NS, EventReceiverConstants.ER_ELEMENT_TO));
if (propertyFromElement == null) {
throw new EventReceiverConfigurationException("An attribute mapping must provide a valid 'from' element");
}
if (propertyToElement == null) {
throw new EventReceiverConfigurationException("An attribute mapping must provide a valid 'to' element");
}
if (propertyToElement.getAttribute(new QName(EventReceiverConstants.ER_ATTR_NAME)) == null ||
propertyToElement.getAttribute(new QName(EventReceiverConstants.ER_ATTR_TYPE)) == null) {
throw new EventReceiverConfigurationException("An attribute mapping must provide name and type for its 'to' element.");
}
}
}
if (count == 0) {
throw new EventReceiverConfigurationException("There must be at least 1 attribute mapping with Custom Mapping enabled.");
}
}
}
}