package org.drools.compiler.rule.builder.dialect.mvel;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import org.drools.compiler.compiler.AnalysisResult;
import org.drools.compiler.compiler.BoundIdentifiers;
import org.drools.compiler.compiler.DescrBuildError;
import org.drools.compiler.rule.builder.EnabledBuilder;
import org.drools.compiler.rule.builder.RuleBuildContext;
import org.drools.compiler.rule.builder.dialect.DialectUtil;
import org.drools.core.base.mvel.MVELCompilationUnit;
import org.drools.core.base.mvel.MVELEnabledExpression;
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.SafeEnabled;
import org.drools.core.spi.KnowledgeHelper;
import org.kie.internal.security.KiePolicyHelper;
public class MVELEnabledBuilder
implements
EnabledBuilder {
public void build(RuleBuildContext context) {
// 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, Class< ? >> otherVars = new HashMap<String, Class< ? >>();
otherVars.put( "rule",
org.drools.core.rule.Rule.class );
Map<String, Declaration> declrs = context.getDeclarationResolver().getDeclarations( context.getRule() );
AnalysisResult analysis = dialect.analyzeExpression( context,
context.getRuleDescr(),
(String) context.getRuleDescr().getEnabled(),
new BoundIdentifiers( context.getDeclarationResolver().getDeclarationClasses( declrs ),
context.getPackageBuilder().getGlobals() ),
otherVars );
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++] = declrs.get( id );
}
Arrays.sort( previousDeclarations, SortDeclarations.instance );
String exprStr = (String) context.getRuleDescr().getEnabled();
exprStr = exprStr.substring( 1,
exprStr.length() - 1 ) + " ";
MVELCompilationUnit unit = dialect.getMVELCompilationUnit( exprStr,
analysis,
previousDeclarations,
null,
otherVars,
context,
"drools",
KnowledgeHelper.class,
false );
MVELEnabledExpression expr = new MVELEnabledExpression( unit,
dialect.getId() );
context.getRule().setEnabled( KiePolicyHelper.isPolicyEnabled() ? new SafeEnabled(expr) : expr );
MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( "mvel" );
data.addCompileable( context.getRule(),
expr );
expr.compile( data );
} catch ( final Exception e ) {
DialectUtil.copyErrorLocation(e, context.getRuleDescr());
context.addError( new DescrBuildError( context.getParentDescr(),
context.getRuleDescr(),
null,
"Unable to build expression for 'enabled' : " + e.getMessage() + " '" + context.getRuleDescr().getEnabled() + "'" ) );
}
}
}