| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.synapse.config.xml; |
| |
| import org.apache.axiom.om.OMAttribute; |
| import org.apache.axiom.om.OMElement; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.synapse.SynapseConstants; |
| import org.apache.synapse.SynapseException; |
| import org.apache.synapse.message.processors.MessageProcessor; |
| import org.apache.synapse.util.xpath.SynapseXPath; |
| import org.jaxen.JaxenException; |
| |
| import javax.xml.namespace.QName; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| |
| /** |
| * Create an instance of the given Message processor, and sets properties on it. |
| * <p/> |
| * <messageProcessor name="string" class="classname" messageStore = "string" > |
| * <parameter name="string">"string" <parameter> |
| * <parameter name="string">"string" <parameter> |
| * <parameter name="string">"string" <parameter> |
| * . |
| * . |
| * </messageProcessor> |
| */ |
| public class MessageProcessorFactory { |
| private static final Log log = LogFactory.getLog(MessageProcessorFactory.class); |
| public static final QName CLASS_Q = new QName(XMLConfigConstants.NULL_NAMESPACE, "class"); |
| public static final QName NAME_Q = new QName(XMLConfigConstants.NULL_NAMESPACE, "name"); |
| public static final QName EXPRESSION_Q = new QName(XMLConfigConstants.NULL_NAMESPACE, "expression"); |
| public static final QName PARAMETER_Q = new QName(XMLConfigConstants.SYNAPSE_NAMESPACE, |
| "parameter"); |
| public static final QName MESSAGE_STORE_Q = new QName(XMLConfigConstants.NULL_NAMESPACE, |
| "messageStore"); |
| public static final QName TARGET_ENDPOINT_Q = |
| new QName(XMLConfigConstants.NULL_NAMESPACE, "targetEndpoint"); |
| private static final QName DESCRIPTION_Q |
| = new QName(SynapseConstants.SYNAPSE_NAMESPACE, "description"); |
| public static final String FORWARDING_PROCESSOR = |
| "org.apache.synapse.message.processors.forward.ScheduledMessageForwardingProcessor"; |
| |
| |
| /** |
| * Creates a Message processor instance from given xml configuration element |
| * |
| * @param elem OMElement of that contain the Message processor configuration |
| * @return created message processor instance |
| */ |
| public static MessageProcessor createMessageProcessor(OMElement elem) { |
| MessageProcessor processor = null; |
| OMAttribute clssAtt = elem.getAttribute(CLASS_Q); |
| |
| if (clssAtt != null) { |
| try { |
| Class cls = Class.forName(clssAtt.getAttributeValue()); |
| processor = (MessageProcessor) cls.newInstance(); |
| } catch (Exception e) { |
| handleException("Error while creating Message processor " + e.getMessage()); |
| } |
| } else { |
| /**We throw Exception since there is not default processor*/ |
| handleException("Can't create Message processor without a provider class"); |
| } |
| |
| OMAttribute nameAtt = elem.getAttribute(NAME_Q); |
| if (nameAtt != null) { |
| assert processor != null; |
| processor.setName(nameAtt.getAttributeValue()); |
| } else { |
| handleException("Can't create Message processor without a name "); |
| } |
| |
| if (FORWARDING_PROCESSOR.equals(clssAtt.getAttributeValue())) { |
| OMAttribute targetEndpointAtt = elem.getAttribute(TARGET_ENDPOINT_Q); |
| |
| if (targetEndpointAtt != null) { |
| assert processor != null; |
| processor.setTargetEndpoint(targetEndpointAtt.getAttributeValue()); |
| } else { |
| // This validation is commented due to backward compatibility |
| // handleException("Can't create Message processor without a target endpoint "); |
| } |
| } |
| |
| OMAttribute storeAtt = elem.getAttribute(MESSAGE_STORE_Q); |
| |
| if (storeAtt != null) { |
| assert processor != null; |
| processor.setMessageStoreName(storeAtt.getAttributeValue()); |
| } else { |
| handleException("Can't create message processor without a message store"); |
| } |
| |
| OMElement descriptionElem = elem.getFirstChildWithName(DESCRIPTION_Q); |
| if (descriptionElem != null) { |
| assert processor != null; |
| processor.setDescription(descriptionElem.getText()); |
| } |
| |
| assert processor != null; |
| processor.setParameters(getParameters(elem)); |
| |
| return processor; |
| } |
| |
| private static Map<String, Object> getParameters(OMElement elem) { |
| Iterator params = elem.getChildrenWithName(PARAMETER_Q); |
| Map<String, Object> parameters = new HashMap<String, Object>(); |
| |
| while (params.hasNext()) { |
| Object o = params.next(); |
| if (o instanceof OMElement) { |
| OMElement prop = (OMElement) o; |
| OMAttribute paramName = prop.getAttribute(NAME_Q); |
| String paramValue = prop.getText(); |
| OMAttribute paramExpression = prop.getAttribute(EXPRESSION_Q); |
| if (paramName != null) { |
| if (paramExpression != null) { |
| try { |
| SynapseXPath expression = SynapseXPathFactory.getSynapseXPath(prop, paramExpression.getAttributeValue()); |
| parameters.put(paramName.getAttributeValue(), expression); |
| } catch (JaxenException e) { |
| handleException("Error while creating expression " + e.getMessage()); |
| } |
| } else if (paramValue != null) { |
| parameters.put(paramName.getAttributeValue(), paramValue); |
| } else { |
| handleException("Invalid MessageStore parameter - Parameter must have a value or an expression "); |
| } |
| } else { |
| handleException("Invalid MessageStore parameter - Parameter must have a name "); |
| } |
| } |
| } |
| return parameters; |
| } |
| |
| private static void handleException(String msg) { |
| log.error(msg); |
| throw new SynapseException(msg); |
| } |
| } |