package org.drools.rule.builder.dialect.mvel;
import java.io.Serializable;
import org.drools.base.mvel.DroolsMVELFactory;
import org.drools.base.mvel.MVELSalienceExpression;
import org.drools.compiler.Dialect;
import org.drools.compiler.RuleError;
import org.drools.rule.builder.RuleBuildContext;
import org.drools.rule.builder.SalienceBuilder;
import org.mvel.ExpressionCompiler;
import org.mvel.MVEL;
import org.mvel.ParserContext;
import org.mvel.integration.impl.ClassImportResolverFactory;
public class MVELSalienceBuilder
implements
SalienceBuilder {
public void build(RuleBuildContext context) {
// pushing consequence LHS into the stack for variable resolution
context.getBuildStack().push( context.getRule().getLhs() );
try {
final DroolsMVELFactory factory = new DroolsMVELFactory( context.getDeclarationResolver().getDeclarations(),
null,
context.getPkg().getGlobals() );
// This builder is re-usable in other dialects, so specify by name
MVELDialect dialect = (MVELDialect) context.getDialect( "mvel" );
Dialect.AnalysisResult analysis = dialect.analyzeExpression( context,
context.getRuleDescr(),
(String) context.getRuleDescr().getSalience() );
final Serializable expr = dialect.compile( (String) context.getRuleDescr().getSalience(),
analysis,
null,
null,
null,
context );
MVELSalienceExpression salience = new MVELSalienceExpression( expr,
factory );
context.getRule().setSalience( salience );
} catch ( final Exception e ) {
context.getErrors().add( new RuleError( context.getRule(),
context.getRuleDescr(),
null,
"Unable to build expression for 'salience' node '" + context.getRuleDescr().getSalience() + "'" ) );
}
}
}