package org.drools.base.mvel;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import org.drools.WorkingMemory;
import org.drools.rule.MVELDialectRuntimeData;
import org.drools.rule.Package;
import org.drools.rule.Rule;
import org.drools.spi.Enabled;
import org.drools.spi.Tuple;
import org.mvel2.MVEL;
public class MVELEnabledExpression
implements
Enabled,
MVELCompileable,
Externalizable {
private static final long serialVersionUID = 400L;
private MVELCompilationUnit unit;
private String id;
private Serializable expr;
private DroolsMVELFactory prototype;
public MVELEnabledExpression() {
}
public MVELEnabledExpression(final MVELCompilationUnit unit,
final String id) {
this.unit = unit;
this.id = id;
}
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
unit = (MVELCompilationUnit) in.readObject();
id = in.readUTF();
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject( unit );
out.writeUTF( id );
}
public void compile(ClassLoader classLoader) {
expr = unit.getCompiledExpression( classLoader );
prototype = unit.getFactory();
}
public boolean getValue(final Tuple tuple,
final Rule rule,
final WorkingMemory workingMemory) {
// it must be cloned for multi-thread safety
DroolsMVELFactory factory = (DroolsMVELFactory) this.prototype.clone();
factory.setContext( tuple,
null,
null,
workingMemory,
null );
factory.createVariable( "rule", rule, rule.getClass() );
// do we have any functions for this namespace?
Package pkg = workingMemory.getRuleBase().getPackage( "MAIN" );
if ( pkg != null ) {
MVELDialectRuntimeData data = (MVELDialectRuntimeData) pkg.getDialectRuntimeRegistry().getDialectData( this.id );
factory.setNextFactory( data.getFunctionFactory() );
}
return ((Boolean) MVEL.executeExpression( this.expr,
null,
factory )).booleanValue();
}
}