crunch-core/src/main/java/org/apache/crunch/types/PTypeFamily.java

/**
 * 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.crunch.types;

import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.Map;

import org.apache.crunch.MapFn;
import org.apache.crunch.Pair;
import org.apache.crunch.Tuple;
import org.apache.crunch.Tuple3;
import org.apache.crunch.Tuple4;
import org.apache.crunch.TupleN;
import org.apache.crunch.Union;

/**
 * An abstract factory for creating {@code PType} instances that have the same
 * serialization/storage backing format.
 * 
 */
public interface PTypeFamily {
  PType<Void> nulls();

  PType<String> strings();

  PType<Long> longs();

  PType<Integer> ints();

  PType<Float> floats();

  PType<Double> doubles();

  PType<Boolean> booleans();

  PType<ByteBuffer> bytes();

  <T> PType<T> records(Class<T> clazz);

  <T> PType<Collection<T>> collections(PType<T> ptype);

  <T> PType<Map<String, T>> maps(PType<T> ptype);

  <V1, V2> PType<Pair<V1, V2>> pairs(PType<V1> p1, PType<V2> p2);

  <V1, V2, V3> PType<Tuple3<V1, V2, V3>> triples(PType<V1> p1, PType<V2> p2, PType<V3> p3);

  <V1, V2, V3, V4> PType<Tuple4<V1, V2, V3, V4>> quads(PType<V1> p1, PType<V2> p2, PType<V3> p3, PType<V4> p4);

  PType<TupleN> tuples(PType<?>... ptypes);

  <T extends Tuple> PType<T> tuples(Class<T> clazz, PType<?>... ptypes);

  <S, T> PType<T> derived(Class<T> clazz, MapFn<S, T> inputFn, MapFn<T, S> outputFn, PType<S> base);

  /**
   * A derived type whose values are immutable. This variaion of derived exists to optimize for the case
   * where deep-copying of data is never needed.
   */
  <S, T> PType<T> derivedImmutable(Class<T> clazz, MapFn<S, T> inputFn, MapFn<T, S> outputFn, PType<S> base);

  PType<Union> unionOf(PType<?>... ptypes);

  <K, V> PTableType<K, V> tableOf(PType<K> key, PType<V> value);

  /**
   * Returns the equivalent of the given ptype for this family, if it exists.
   */
  <T> PType<T> as(PType<T> ptype);
}