package org.apache.synapse.config.xml;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMNamespace;
import org.apache.synapse.mediators.MediatorProperty;
import org.apache.synapse.SynapseConstants;
import org.apache.synapse.SynapseException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.xml.namespace.QName;
import java.util.Collection;
/**
* A utility class for serializing instances of MediatorProperty objects by reading
* through a given XML configuration
*
* <pre>
* <element>
* <property name="string" (value="literal" | expression="xpath")/>*
* </element>
* </pre>
*/
public class MediatorPropertySerializer {
private static final Log log = LogFactory.getLog(MediatorPropertySerializer.class);
protected static final OMFactory fac = OMAbstractFactory.getOMFactory();
protected static final OMNamespace synNS = SynapseConstants.SYNAPSE_OMNAMESPACE;
protected static final OMNamespace nullNS
= fac.createOMNamespace(XMLConfigConstants.NULL_NAMESPACE, "");
protected static final QName PROP_Q
= new QName(XMLConfigConstants.SYNAPSE_NAMESPACE, "property");
/**
* Serialize all the properties to the given paren element. For each and every
* property ther will be a seperate property element created inside the parent element.
*
* @param parent element to which property elements should be added
* @param props <code>Collection</code> of propertis
*/
public static void serializeMediatorProperties(OMElement parent,
Collection<MediatorProperty> props) {
serializeMediatorProperties(parent, props, PROP_Q);
}
/**
* Serialize all the properties to the given paren element. For each and every
* property ther will be a seperate element with the given name created inside the
* parent element.
*
* @param parent element to which property elements should be added
* @param props <code>Collection</code> of propertis
* @param childElementName <code>QNmae</code> of the property element to be created
*/
public static void serializeMediatorProperties(OMElement parent,
Collection<MediatorProperty> props,
QName childElementName) {
for (MediatorProperty mp : props) {
serializeMediatorProperty(parent, mp, childElementName);
}
}
/**
* Serialize the property to the given paren element. There will be a element created with
* the name property inside the parent element.
*
* @param parent element to which property elements should be added
* @param mp a property to be serialized
*/
public static void serializeMediatorProperty(OMElement parent,
MediatorProperty mp) {
serializeMediatorProperty(parent, mp, PROP_Q);
}
/**
* Serialize the property to the given paren element. There will be a element created with
* given name inside the parent element.
*
* @param parent element to which property elements should be added
* @param mp a property to be serialized
* @param childElementName <code>QName</code> of the element to be created
*/
public static void serializeMediatorProperty(OMElement parent,
MediatorProperty mp,
QName childElementName) {
OMElement prop = fac.createOMElement(childElementName, parent);
if (mp.getName() != null) {
prop.addAttribute(fac.createOMAttribute("name", nullNS, mp.getName()));
} else {
String msg = "Mediator property name missing";
log.error(msg);
throw new SynapseException(msg);
}
if (mp.getValue() != null) {
prop.addAttribute(fac.createOMAttribute("value", nullNS, mp.getValue()));
} else if (mp.getExpression() != null) {
SynapseXPathSerializer.serializeXPath(mp.getExpression(), prop, "expression");
} else {
String msg = "Mediator property must have a literal value or be an expression";
log.error(msg);
throw new SynapseException(msg);
}
}
}