Pattern prefixPattern ) {
final PatternDescr patternDescr = (PatternDescr) descr;
if ( patternDescr.getObjectType() == null || patternDescr.getObjectType().equals( "" ) ) {
context.getErrors().add( new DescrBuildError( context.getParentDescr(),
patternDescr,
null,
"ObjectType not correctly defined" ) );
return null;
}
ObjectType objectType = null;
final FactTemplate factTemplate = context.getPkg().getFactTemplate( patternDescr.getObjectType() );
if ( factTemplate != null ) {
objectType = new FactTemplateObjectType( factTemplate );
} else {
try {
final Class< ? > userProvidedClass = context.getDialect().getTypeResolver().resolveType( patternDescr.getObjectType() );
PackageRegistry pkgr = context.getPackageBuilder().getPackageRegistry( ClassUtils.getPackage( userProvidedClass ) );
org.drools.rule.Package pkg = pkgr == null ? context.getPkg() : pkgr.getPackage();
final boolean isEvent = pkg.isEvent( userProvidedClass );
objectType = new ClassObjectType( userProvidedClass,
isEvent );
} catch ( final ClassNotFoundException e ) {
// swallow as we'll do another check in a moment and then record the problem
}
}
// lets see if it maps to a query
if ( objectType == null ) {
RuleConditionElement rce = null;
// it might be a recursive query, so check for same names
if ( context.getRule().getName().equals( patternDescr.getObjectType() ) ) {
// it's a query so delegate to the QueryElementBuilder
QueryElementBuilder qeBuilder = new QueryElementBuilder();
rce = qeBuilder.build( context,
descr,
prefixPattern,
(Query) context.getRule() );
}
if ( rce == null ) {
Rule rule = context.getPkg().getRule( patternDescr.getObjectType() );
if ( rule != null && rule instanceof Query ) {
// it's a query so delegate to the QueryElementBuilder
QueryElementBuilder qeBuilder = new QueryElementBuilder();
rce = qeBuilder.build( context,
descr,
prefixPattern,
(Query) rule );
}
// try package imports
for ( String importName : context.getDialect().getTypeResolver().getImports() ) {
importName = importName.trim();
int pos = importName.indexOf( '*' );
if ( pos >= 0 ) {
String pkgName = importName.substring( 0, pos-1 );
PackageRegistry pkgReg = context.getPackageBuilder().getPackageRegistry( pkgName );
if ( pkgReg != null ) {
rule = pkgReg.getPackage().getRule( patternDescr.getObjectType() );
if ( rule != null && rule instanceof Query ) {
// it's a query so delegate to the QueryElementBuilder
QueryElementBuilder qeBuilder = new QueryElementBuilder();
rce = qeBuilder.build( context,
descr,
prefixPattern,
(Query) rule);
break;
}
}
}
}
}
if ( rce == null ) {
// this isn't a query either, so log an error
context.getErrors().add( new DescrBuildError( context.getParentDescr(),
patternDescr,
null,
"Unable to resolve ObjectType '" + patternDescr.getObjectType() + "'" ) );
}
return rce;
}
Pattern pattern;
boolean duplicateBindings = context.getDeclarationResolver().isDuplicated( context.getRule(),
patternDescr.getIdentifier() );
if ( !StringUtils.isEmpty( patternDescr.getIdentifier() ) && !duplicateBindings ) {
pattern = new Pattern( context.getNextPatternId(),
0, // offset is 0 by default
objectType,
patternDescr.getIdentifier(),
patternDescr.isInternalFact() );
if ( objectType instanceof ClassObjectType ) {
// make sure PatternExtractor is wired up to correct ClassObjectType and set as a target for rewiring
context.getPkg().getClassFieldAccessorStore().getClassObjectType( ((ClassObjectType) objectType),
(PatternExtractor) pattern.getDeclaration().getExtractor() );
}
} else {
pattern = new Pattern( context.getNextPatternId(),
0, // offset is 0 by default
objectType,
null );
}
if ( ClassObjectType.Activation_ObjectType.isAssignableFrom( pattern.getObjectType() ) ) {
PropertyHandler handler = PropertyHandlerFactory.getPropertyHandler( AgendaItem.class );
if ( handler == null ) {
PropertyHandlerFactoryFixer.getPropertyHandlerClass().put( AgendaItem.class, new ActivationPropertyHandler() );
}
}
if ( duplicateBindings ) {
if ( patternDescr.isUnification() ) {
// rewrite existing bindings into == constraints, so it unifies
build( context,
patternDescr,
pattern,
patternDescr,
"this == " + patternDescr.getIdentifier() );
} else {
// This declaration already exists, so throw an Exception
context.getErrors().add( new DescrBuildError( context.getParentDescr(),
patternDescr,
null,
"Duplicate declaration for variable '" + patternDescr.getIdentifier() + "' in the rule '" + context.getRule().getName() + "'" ) );
}
}
if ( objectType instanceof ClassObjectType ) {
// make sure the Pattern is wired up to correct ClassObjectType and set as a target for rewiring
context.getPkg().getClassFieldAccessorStore().getClassObjectType( ((ClassObjectType) objectType),
pattern );
}
// adding the newly created pattern to the build stack this is necessary in case of local declaration usage
context.getBuildStack().push( pattern );
if ( pattern.getObjectType() instanceof ClassObjectType ) {
Class< ? > cls = ((ClassObjectType) pattern.getObjectType()).getClassType();
TypeDeclaration typeDeclr = context.getPackageBuilder().getTypeDeclaration( cls );
if ( typeDeclr != null ) {
context.setTypesafe( typeDeclr.isTypesafe() );
} else {
context.setTypesafe( true );
}
}
// Process all constraints
processConstraintsAndBinds( context,
patternDescr,
pattern );
if ( patternDescr.getSource() != null ) {
// we have a pattern source, so build it
RuleConditionBuilder builder = (RuleConditionBuilder) context.getDialect().getBuilder( patternDescr.getSource().getClass() );
PatternSource source = (PatternSource) builder.build( context,
patternDescr.getSource() );
if ( source instanceof From ) {
((From)source).setResultPattern( pattern );
}
pattern.setSource( source );
}
for ( BehaviorDescr behaviorDescr : patternDescr.getBehaviors() ) {
if ( pattern.getObjectType().isEvent() ) {
if ( Behavior.BehaviorType.TIME_WINDOW.matches( behaviorDescr.getSubType() ) ) {
SlidingTimeWindow window = new SlidingTimeWindow( TimeUtils.parseTimeString( behaviorDescr.getParameters().get( 0 ) ) );
pattern.addBehavior( window );
} else if ( Behavior.BehaviorType.LENGTH_WINDOW.matches( behaviorDescr.getSubType() ) ) {
SlidingLengthWindow window = new SlidingLengthWindow( Integer.valueOf( behaviorDescr.getParameters().get( 0 ) ) );
pattern.addBehavior( window );
}
} else {
// Some behaviors can only be assigned to patterns declared as events
context.getErrors().add( new DescrBuildError( context.getParentDescr(),
patternDescr,
null,
"A Sliding Window behavior can only be assigned to patterns declared with @role( event ). The pattern '" + pattern.getObjectType() + "' in the rule '" + context.getRule().getName()
+ "' is not declared as an Event." ) );
}