org.apache.hudi.common.data.HoodieBaseListData Maven / Gradle / Ivy
/*
* 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.hudi.common.data;
import org.apache.hudi.common.util.Either;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* Data representation of either a stream or a list of objects with Type T.
*
* @param Object value type.
*/
public abstract class HoodieBaseListData {
protected final Either, List> data;
protected final boolean lazy;
protected HoodieBaseListData(List data, boolean lazy) {
this.data = lazy ? Either.left(data.stream().parallel()) : Either.right(data);
this.lazy = lazy;
}
protected HoodieBaseListData(Stream dataStream, boolean lazy) {
// NOTE: In case this container is being instantiated by an eager parent, we have to
// pre-materialize the stream
this.data = lazy ? Either.left(dataStream) : Either.right(dataStream.collect(Collectors.toList()));
this.lazy = lazy;
}
protected Stream asStream() {
return lazy ? data.asLeft() : data.asRight().parallelStream();
}
protected boolean isEmpty() {
if (lazy) {
return data.asLeft().findAny().isPresent();
} else {
return data.asRight().isEmpty();
}
}
protected long count() {
if (lazy) {
return data.asLeft().count();
} else {
return data.asRight().size();
}
}
protected List collectAsList() {
if (lazy) {
return data.asLeft().collect(Collectors.toList());
} else {
return data.asRight();
}
}
}