Examples with AbductiveQuery org.drools.core.rule.AbductiveQuery used on opensource projects

Example 1 with AbductiveQuery

use of org.drools.core.rule.AbductiveQuery in project drools by kiegroup.

the class QueryBuilder method build.

public Pattern build(final RuleBuildContext context, final QueryDescr queryDescr) {
    ObjectType queryObjectType = ClassObjectType.DroolsQuery_ObjectType;
    final Pattern pattern = new Pattern(context.getNextPatternId(), // offset is 0 by default
    0, queryObjectType, null);
    final InternalReadAccessor extractor = PatternBuilder.getFieldReadAccessor(context, queryDescr, pattern, "name", null, true);
    final QueryNameConstraint constraint = new QueryNameConstraint(extractor, queryDescr.getName());
    PatternBuilder.registerReadAccessor(context, queryObjectType, "name", constraint);
    // adds appropriate constraint to the pattern
    pattern.addConstraint(constraint);
    ObjectType argsObjectType = ClassObjectType.DroolsQuery_ObjectType;
    InternalReadAccessor arrayExtractor = PatternBuilder.getFieldReadAccessor(context, queryDescr, null, argsObjectType, "elements", null, true);
    QueryImpl query = ((QueryImpl) context.getRule());
    String[] params;
    String[] types;
    int numParams = queryDescr.getParameters().length;
    if (query.isAbductive()) {
        params = Arrays.copyOf(queryDescr.getParameters(), queryDescr.getParameters().length + 1);
        types = Arrays.copyOf(queryDescr.getParameterTypes(), queryDescr.getParameterTypes().length + 1);
    } else {
        params = queryDescr.getParameters();
        types = queryDescr.getParameterTypes();
    }
    Declaration[] declarations = new Declaration[params.length];
    Class<?> abductionReturnKlass = null;
    if (query.isAbductive()) {
        Abductive abductive = queryDescr.getTypedAnnotation(Abductive.class);
        abductionReturnKlass = abductive.target();
        params[numParams] = "";
        types[numParams] = abductionReturnKlass.getName();
    }
    int i = 0;
    try {
        for (i = 0; i < params.length; i++) {
            Declaration declr = pattern.addDeclaration(params[i]);
            // this bit is different, notice its the ArrayElementReader that we wire up to, not the declaration.
            ArrayElementReader reader = new ArrayElementReader(arrayExtractor, i, context.getDialect().getTypeResolver().resolveType(types[i]));
            PatternBuilder.registerReadAccessor(context, argsObjectType, "elements", reader);
            declr.setReadAccessor(reader);
            declarations[i] = declr;
        }
        query.setParameters(declarations);
    } catch (ClassNotFoundException e) {
        context.addError(new DescrBuildError(context.getParentDescr(), queryDescr, e, "Unable to resolve type '" + types[i] + " for parameter" + params[i]));
    }
    context.setPrefixPattern(pattern);
    if (query.isAbductive()) {
        String returnName = "";
        try {
            AnnotationDescr ann = queryDescr.getAnnotation(Abductive.class);
            Object[] argsVal = ((Object[]) ann.getValue("args"));
            String[] args = argsVal != null ? Arrays.copyOf(argsVal, argsVal.length, String[].class) : null;
            returnName = types[numParams];
            ObjectType objectType = new ClassObjectType(abductionReturnKlass, false);
            objectType = context.getPkg().getClassFieldAccessorStore().wireObjectType(objectType, (AbductiveQuery) query);
            ((AbductiveQuery) query).setReturnType(objectType, params, args, declarations);
        } catch (NoSuchMethodException e) {
            context.addError(new DescrBuildError(context.getParentDescr(), queryDescr, e, "Unable to resolve abducible constructor for type : " + returnName + " with types " + Arrays.toString(types)));
        } catch (IllegalArgumentException e) {
            context.addError(new DescrBuildError(context.getParentDescr(), queryDescr, e, e.getMessage()));
        }
    }
    return pattern;
}