Examples with FunctionTemplate org.apache.drill.exec.expr.annotations.FunctionTemplate used on opensource projects

Example 6 with FunctionTemplate

use of org.apache.drill.exec.expr.annotations.FunctionTemplate in project drill by apache.

the class TestClassPathScanner method verifyAnnotations.

private void verifyAnnotations(Annotation[] annotations, List<AnnotationDescriptor> scannedAnnotations) throws Exception {
    assertEquals(Arrays.toString(annotations) + " expected but got " + scannedAnnotations, annotations.length, scannedAnnotations.size());
    for (int i = 0; i < annotations.length; i++) {
        Annotation annotation = annotations[i];
        AnnotationDescriptor scannedAnnotation = scannedAnnotations.get(i);
        Class<? extends Annotation> annotationType = annotation.annotationType();
        assertEquals(annotationType.getName(), scannedAnnotation.getAnnotationType());
        if (annotation instanceof FunctionTemplate) {
            FunctionTemplate ft = (FunctionTemplate) annotation;
            if (!"".equals(ft.name())) {
                assertEquals(ft.name(), scannedAnnotation.getSingleValue("name"));
            }
        }
        // generally verify all properties
        Annotation proxy = scannedAnnotation.getProxy(annotationType);
        Method[] declaredMethods = annotationType.getDeclaredMethods();
        for (Method method : declaredMethods) {
            if (method.getParameterTypes().length == 0) {
                Object reflectValue = method.invoke(annotation);
                Object byteCodeValue = method.invoke(proxy);
                String message = annotationType.getSimpleName() + "." + method.getName();
                if (method.getReturnType().isArray()) {
                    assertArrayEquals(message, (Object[]) reflectValue, (Object[]) byteCodeValue);
                } else {
                    assertEquals(message, reflectValue, byteCodeValue);
                }
            }
        }
    }
}

Example 7 with FunctionTemplate

use of org.apache.drill.exec.expr.annotations.FunctionTemplate in project drill by apache.

the class FunctionConverter method getHolder.

public DrillFuncHolder getHolder(AnnotatedClassDescriptor func, ClassLoader classLoader) {
    FunctionTemplate template = func.getAnnotationProxy(FunctionTemplate.class);
    if (template == null) {
        return failure("Class does not declare FunctionTemplate annotation.", func);
    }
    String name = template.name();
    List<String> names = Arrays.asList(template.names());
    if (name.isEmpty() && names.isEmpty()) {
        // none set
        return failure("Must define 'name' or 'names'", func);
    }
    if (!name.isEmpty() && !names.isEmpty()) {
        // both are set
        return failure("Must use only one annotations 'name' or 'names', not both", func);
    }
    // start by getting field information.
    List<ValueReference> params = Lists.newArrayList();
    List<WorkspaceReference> workspaceFields = Lists.newArrayList();
    ValueReference outputField = null;
    int varArgsCount = 0;
    for (FieldDescriptor field : func.getFields()) {
        Param param = field.getAnnotationProxy(Param.class);
        Output output = field.getAnnotationProxy(Output.class);
        Workspace workspace = field.getAnnotationProxy(Workspace.class);
        Inject inject = field.getAnnotationProxy(Inject.class);
        Annotation[] annotations = { param, output, workspace, inject };
        int annotationCount = 0;
        for (Annotation annotationDescriptor : annotations) {
            if (annotationDescriptor != null) {
                annotationCount += 1;
            }
        }
        if (annotationCount == 0) {
            return failure("The field must be either a @Param, @Output, @Inject or @Workspace field.", func, field);
        } else if (annotationCount > 1) {
            return failure("The field must be only one of @Param, @Output, @Inject or @Workspace. It currently has more than one of these annotations.", func, field);
        }
        // TODO(Julien): verify there are a few of those and we can load them
        Class<?> fieldClass = field.getFieldClass();
        if (param != null || output != null) {
            if (Object[].class.isAssignableFrom(fieldClass)) {
                fieldClass = fieldClass.getComponentType();
                varArgsCount++;
            } else if (varArgsCount > 0 && param != null) {
                return failure("Vararg should be the last argument in the function.", func, field);
            }
            if (varArgsCount > 1) {
                return failure("Function should contain single vararg argument", func, field);
            }
            // Special processing for @Param FieldReader
            if (param != null && FieldReader.class.isAssignableFrom(fieldClass)) {
                ValueReference fieldReaderRef = ValueReference.createFieldReaderRef(field.getName());
                fieldReaderRef.setVarArg(varArgsCount > 0);
                params.add(fieldReaderRef);
                continue;
            }
            // Special processing for @Output ComplexWriter
            if (output != null && ComplexWriter.class.isAssignableFrom(fieldClass)) {
                if (outputField != null) {
                    return failure("You've declared more than one @Output field.\n" + "You must declare one and only @Output field per Function class.", func, field);
                } else {
                    outputField = ValueReference.createComplexWriterRef(field.getName());
                }
                continue;
            }
            // check that param and output are value holders.
            if (!ValueHolder.class.isAssignableFrom(fieldClass)) {
                return failure(String.format("The field doesn't holds value of type %s which does not implement the ValueHolder or ComplexWriter interfaces.\n" + "All fields of type @Param or @Output must extend this interface.", fieldClass), func, field);
            }
            // get the type field from the value holder.
            MajorType type;
            try {
                type = getStaticFieldValue("TYPE", fieldClass, MajorType.class);
            } catch (Exception e) {
                return failure("Failure while trying to access the ValueHolder's TYPE static variable.  All ValueHolders must contain a static TYPE variable that defines their MajorType.", e, func, field);
            }
            ValueReference p = new ValueReference(type, field.getName());
            if (param != null) {
                p.setConstant(param.constant());
                p.setVarArg(varArgsCount > 0);
                params.add(p);
            } else {
                if (outputField != null) {
                    return failure("You've declared more than one @Output field.  You must declare one and only @Output field per Function class.", func, field);
                } else {
                    outputField = p;
                }
            }
        } else {
            // workspace work.
            boolean isInject = inject != null;
            if (isInject && UdfUtilities.INJECTABLE_GETTER_METHODS.get(fieldClass) == null) {
                return failure(String.format("A %s cannot be injected into a %s," + " available injectable classes are: %s.", fieldClass, DrillFunc.class.getSimpleName(), Joiner.on(",").join(UdfUtilities.INJECTABLE_GETTER_METHODS.keySet())), func, field);
            }
            WorkspaceReference wsReference = new WorkspaceReference(fieldClass, field.getName(), isInject);
            if (!isInject && template.scope() == FunctionScope.POINT_AGGREGATE && !ValueHolder.class.isAssignableFrom(fieldClass)) {
                return failure(String.format("Aggregate function '%s' workspace variable '%s' is of type '%s'. Please change it to Holder type.", func.getClassName(), field.getName(), fieldClass), func, field);
            }
            // If the workspace var is of Holder type, get its MajorType and assign to WorkspaceReference.
            if (ValueHolder.class.isAssignableFrom(fieldClass)) {
                MajorType majorType;
                try {
                    majorType = getStaticFieldValue("TYPE", fieldClass, MajorType.class);
                } catch (Exception e) {
                    return failure("Failure while trying to access the ValueHolder's TYPE static variable.  All ValueHolders must contain a static TYPE variable that defines their MajorType.", e, func, field);
                }
                wsReference.setMajorType(majorType);
            }
            workspaceFields.add(wsReference);
        }
    }
    if (outputField == null) {
        return failure("This function declares zero output fields.  A function must declare one output field.", func);
    }
    FunctionInitializer initializer = new FunctionInitializer(func.getClassName(), classLoader);
    try {
        // return holder
        ValueReference[] ps = params.toArray(new ValueReference[0]);
        WorkspaceReference[] works = workspaceFields.toArray(new WorkspaceReference[0]);
        FunctionAttributes functionAttributes = new FunctionAttributes(template, ps, outputField, works);
        switch(template.scope()) {
            case POINT_AGGREGATE:
                return outputField.isComplexWriter() ? new DrillComplexWriterAggFuncHolder(functionAttributes, initializer) : new DrillAggFuncHolder(functionAttributes, initializer);
            case SIMPLE:
                return outputField.isComplexWriter() ? new DrillComplexWriterFuncHolder(functionAttributes, initializer) : new DrillSimpleFuncHolder(functionAttributes, initializer);
            case HOLISTIC_AGGREGATE:
            case RANGE_AGGREGATE:
            default:
                return failure("Unsupported Function Type.", func);
        }
    } catch (Exception | NoSuchFieldError | AbstractMethodError ex) {
        return failure("Failure while creating function holder.", ex, func);
    }
}