package org.drools.guvnor.server.util;
import org.drools.guvnor.client.modeldriven.brl.ActionFieldValue;
import org.drools.guvnor.client.modeldriven.brl.ActionInsertFact;
import org.drools.guvnor.client.modeldriven.brl.ActionInsertLogicalFact;
import org.drools.guvnor.client.modeldriven.brl.ActionRetractFact;
import org.drools.guvnor.client.modeldriven.brl.ActionSetField;
import org.drools.guvnor.client.modeldriven.brl.ActionUpdateField;
import org.drools.guvnor.client.modeldriven.brl.CompositeFactPattern;
import org.drools.guvnor.client.modeldriven.brl.CompositeFieldConstraint;
import org.drools.guvnor.client.modeldriven.brl.ConnectiveConstraint;
import org.drools.guvnor.client.modeldriven.brl.DSLSentence;
import org.drools.guvnor.client.modeldriven.brl.FactPattern;
import org.drools.guvnor.client.modeldriven.brl.FreeFormLine;
import org.drools.guvnor.client.modeldriven.brl.RuleAttribute;
import org.drools.guvnor.client.modeldriven.brl.RuleMetadata;
import org.drools.guvnor.client.modeldriven.brl.RuleModel;
import org.drools.guvnor.client.modeldriven.brl.SingleFieldConstraint;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
/**
* This class persists the rule model to XML and back.
*
* This is the 'brl' xml format (Business Rule Language).
*
* @author Michael Neale
*/
public class BRXMLPersistence implements BRLPersistence {
private XStream xt;
private static final BRLPersistence INSTANCE = new BRXMLPersistence();
private BRXMLPersistence() {
this.xt = new XStream( new DomDriver() );
this.xt.alias( "rule",
RuleModel.class );
this.xt.alias( "fact",
FactPattern.class );
this.xt.alias( "retract",
ActionRetractFact.class );
this.xt.alias( "assert",
ActionInsertFact.class );
this.xt.alias( "modify",
ActionUpdateField.class );
this.xt.alias( "setField",
ActionSetField.class );
this.xt.alias( "dslSentence",
DSLSentence.class );
this.xt.alias( "compositePattern",
CompositeFactPattern.class );
this.xt.alias( "metadata",
RuleMetadata.class );
this.xt.alias( "attribute",
RuleAttribute.class );
this.xt.alias( "fieldValue",
ActionFieldValue.class );
this.xt.alias( "connectiveConstraint",
ConnectiveConstraint.class );
this.xt.alias( "fieldConstraint",
SingleFieldConstraint.class );
this.xt.alias( "compositeConstraint",
CompositeFieldConstraint.class );
this.xt.alias( "assertLogical",
ActionInsertLogicalFact.class );
this.xt.alias("freeForm", FreeFormLine.class);
}
public static BRLPersistence getInstance() {
return INSTANCE;
}
/* (non-Javadoc)
* @see org.drools.guvnor.server.util.BRLPersistence#toXML(org.drools.guvnor.client.modeldriven.brl.RuleModel)
*/
public String marshal(final RuleModel model) {
return this.xt.toXML( model );
}
/* (non-Javadoc)
* @see org.drools.guvnor.server.util.BRLPersistence#toModel(java.lang.String)
*/
public RuleModel unmarshal(final String xml) {
if ( xml == null ) {
return new RuleModel();
}
if ( xml.trim().equals( "" ) ) {
return new RuleModel();
}
RuleModel rm = (RuleModel) this.xt.fromXML( xml );
//Fixme , hack for a upgrade to add Metadata
if(rm.metadataList == null){
rm.metadataList = new RuleMetadata[0];
}
return rm;
}
}