package org.drools.compiler.rule.builder.dialect.mvel;
import static org.drools.compiler.rule.builder.dialect.DialectUtil.copyErrorLocation;
import java.util.Arrays;
import java.util.Map;
import org.drools.compiler.compiler.BoundIdentifiers;
import org.drools.compiler.compiler.DescrBuildError;
import org.drools.compiler.rule.builder.RuleBuildContext;
import org.drools.compiler.rule.builder.SalienceBuilder;
import org.drools.core.base.mvel.MVELCompilationUnit;
import org.drools.core.base.mvel.MVELSalienceExpression;
import org.drools.core.reteoo.RuleTerminalNode.SortDeclarations;
import org.drools.core.rule.Declaration;
import org.drools.core.rule.MVELDialectRuntimeData;
import org.drools.core.rule.Rule.SafeSalience;
import org.drools.core.spi.KnowledgeHelper;
import org.kie.internal.security.KiePolicyHelper;
public class MVELSalienceBuilder
implements
SalienceBuilder {
public void build(RuleBuildContext context) {
boolean typesafe = context.isTypesafe();
// pushing consequence LHS into the stack for variable resolution
context.getBuildStack().push( context.getRule().getLhs() );
try {
// This builder is re-usable in other dialects, so specify by name
MVELDialect dialect = (MVELDialect) context.getDialect( "mvel" );
Map<String, Declaration> decls = context.getDeclarationResolver().getDeclarations(context.getRule());
MVELAnalysisResult analysis = ( MVELAnalysisResult) dialect.analyzeExpression( context,
context.getRuleDescr(),
(String) context.getRuleDescr().getSalience(),
new BoundIdentifiers(context.getDeclarationResolver().getDeclarationClasses( decls ),
context.getPackageBuilder().getGlobals() ) );
context.setTypesafe( analysis.isTypesafe() );
final BoundIdentifiers usedIdentifiers = analysis.getBoundIdentifiers();
int i = usedIdentifiers.getDeclrClasses().keySet().size();
Declaration[] previousDeclarations = new Declaration[i];
i = 0;
for ( String id : usedIdentifiers.getDeclrClasses().keySet() ) {
previousDeclarations[i++] = decls.get( id );
}
Arrays.sort( previousDeclarations, SortDeclarations.instance );
MVELCompilationUnit unit = dialect.getMVELCompilationUnit( (String) context.getRuleDescr().getSalience(),
analysis,
previousDeclarations,
null,
null,
context,
"drools",
KnowledgeHelper.class,
false );
MVELSalienceExpression expr = new MVELSalienceExpression( unit,
dialect.getId() );
context.getRule().setSalience( KiePolicyHelper.isPolicyEnabled() ? new SafeSalience(expr) : expr );
MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
data.addCompileable( context.getRule(),
expr );
expr.compile( data );
} catch ( final Exception e ) {
copyErrorLocation(e, context.getRuleDescr());
context.addError( new DescrBuildError( context.getParentDescr(),
context.getRuleDescr(),
null,
"Unable to build expression for 'salience' : " + e.getMessage() + "'" + context.getRuleDescr().getSalience() + "'" ) );
} finally {
context.setTypesafe( typesafe );
}
}
}