| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.wayang.core.types; |
| |
| /** |
| * The type of data types designate the kind of data that are being passed between operators. |
| */ |
| public abstract class DataUnitType<T> { |
| |
| /** |
| * Tells whether this data unit type represents groups of data units. |
| */ |
| public abstract boolean isGroup(); |
| |
| /** |
| * Tells whether this is a normal data unit type. |
| */ |
| public boolean isPlain() { |
| return !this.isGroup(); |
| } |
| |
| public static <T> DataUnitGroupType<T> createGrouped(Class<T> cls) { |
| return createGroupedUnchecked(cls); |
| } |
| |
| public static <T> BasicDataUnitType<T> createBasic(Class<T> cls) { |
| return createBasicUnchecked(cls); |
| } |
| |
| public static <T> DataUnitGroupType<T> createGroupedUnchecked(Class<?> cls) { |
| return new DataUnitGroupType<>(createBasicUnchecked(cls)); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static <T> BasicDataUnitType<T> createBasicUnchecked(Class<?> cls) { |
| return new BasicDataUnitType<>((Class<T>) cls); |
| } |
| |
| /** |
| * Converts this instance into a {@link BasicDataUnitType}. |
| * |
| * @return the {@link BasicDataUnitType} |
| */ |
| public abstract BasicDataUnitType<T> toBasicDataUnitType(); |
| |
| /** |
| * Checks whether the given instance is the same as this instance or more specific. |
| * |
| * @param that the other instance |
| * @return whether this instance is a super type of {@code that} instance |
| */ |
| public boolean isSupertypeOf(BasicDataUnitType<?> that) { |
| return this.getTypeClass().isAssignableFrom(that.getTypeClass()); |
| } |
| |
| public abstract Class<T> getTypeClass(); |
| } |