Java tutorial
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No patent license is granted separate from the Software, for code that you delete from the Software, or for combinations of the Software with other software or hardware. */ package org.openadaptor.auxil.connector.jms; import javax.jms.JMSException; import javax.jms.Message; import javax.jms.TextMessage; import javax.jms.Session; import org.openadaptor.auxil.connector.jms.IMessageGenerator; import org.openadaptor.core.exception.ProcessingException; import org.openadaptor.core.exception.RecordFormatException; import org.dom4j.*; import java.util.*; /* * File: $Header: $ * Rev: $Revision: $ * Created Sep 22, 2008 by Martin Mooney */ /** * This class will set properties in the header of a JMS message using the XML * message itself as the source for these messages. It will use xpath to get the * value of the message.<br> * </p> * Example bean:<br> * <br> * * <pre> * <bean id="JMSPropertySetter" class="utils.openadaptor.JMSPropertiesMessageGenerator"> * <property name="properties"> * <map> * <entry key="Client" value="//Fields/Client"/> * <entry key="ActivityType" value="//Fields/ActivityType"/> * <entry key="FundOrCostCentreID" value="//Fields/FundOrCostCentreID"/> * <entry key="InstructionsRequired" value="//Fields/InstructionsRequired"/> * <entry key="AutoSettInd" value="//Fields/AutoSettInd"/> * <entry key="CptyInternalRef" value="//Fields/CptyInternalRef"/> * <entry key="CptyMajor" value="//Fields/CptyMajor"/> * </map> * </property> * </bean> * </pre> * * <p> * As you can see you may have as many entries as necessary. The key becomes the * name of of the property on the JMS message and the value is used via xpath to * get the value from the XML message being passed in. * </p> * <p> * If the value does not begin with // then it is treated as is and added to the properties. * </p> * <p> * The 'isXml' property is optional and defaults to true if not supplied. When set to false * the input is assumed not to be XML so no parsing is done to prevent XML errors from * being thrown. This also causes all map entries to be treated literally * </p> * <p> * The input to this Message Generator is expected to be either a String * containing valid XML or a Dom4j Document if 'isXml' is true or a String otherwise. * </p> * * Contributed by: Martin Mooney<br> * Modified by: Kevin Scully */ public class JMSPropertiesMessageGenerator implements IMessageGenerator { private Map _properties = new HashMap(); private boolean isXml = true; public Message createMessage(Object messageRecord, Session session) throws JMSException { String key = null; String value = null; String path = null; try { Document document = null; String mr; if (getIsXml()) { // Will cope with either a string with valid xml or a Dom4j Document. if (messageRecord instanceof Document) { document = (Document) messageRecord; mr = document.asXML(); } else if ((messageRecord instanceof String)) { mr = (String) messageRecord; document = DocumentHelper.parseText(mr); } else { // Since we are creating a TextMessage throw new RecordFormatException("Unsupported record type [" + messageRecord.getClass().getName() + "]. Must be either XML or a Dom4j Document."); } } else { try { mr = (String) messageRecord; } catch (ClassCastException cce) { throw new RecordFormatException("Unsupported record type [" + messageRecord.getClass().getName() + "]. With isXML false this must be a String as we wish to create a TextMessage."); } } // Now convert to TextMessage and return TextMessage tm = session.createTextMessage(); for (Iterator keys = _properties.keySet().iterator(); keys.hasNext();) { key = (String) keys.next(); path = (String) _properties.get(key); if (path.startsWith("//") && this.getIsXml() && document != null) { // we have an XPath // use xpath to get the value from the message Node node = document.selectSingleNode(path); if (node != null) { value = node.getText(); tm.setStringProperty(key, value); } else { throw new ProcessingException("XPATH with value [" + path + "] does not exist in XML"); } } else { // we have a literal tm.setStringProperty(key, path); } } tm.setText(mr); return tm; } catch (DocumentException e) { throw new RecordFormatException("Unable to generate Document from record [" + messageRecord + "]"); } } public void setProperties(Map properties) { this._properties = properties; } public Map getProperties() { return this._properties; } public boolean getIsXml() { return isXml; } public void setIsXml(boolean isXml) { this.isXml = isXml; } }