/*
* 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.flink.api.common.operators.util;
import java.io.IOException;
import org.apache.flink.api.common.io.InputFormat;
import org.apache.flink.api.common.io.NonParallelInput;
import org.apache.flink.api.common.io.DefaultInputSplitAssigner;
import org.apache.flink.api.common.io.statistics.BaseStatistics;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.io.GenericInputSplit;
/**
* Generic base class for all inputs that are not based on files.
* This is copied from {@link org.apache.flink.api.common.io.GenericInputFormat}
* This class doesn't provide access to RuntimeContext.
*/
public abstract class NonRichGenericInputFormat<OT> implements InputFormat<OT, GenericInputSplit> {
private static final long serialVersionUID = 1L;
/**
* The partition of this split.
*/
protected int partitionNumber;
// --------------------------------------------------------------------------------------------
@Override
public void configure(Configuration parameters) {
// nothing by default
}
@Override
public BaseStatistics getStatistics(BaseStatistics cachedStatistics) throws IOException {
// no statistics available, by default.
return cachedStatistics;
}
@Override
public GenericInputSplit[] createInputSplits(int numSplits) throws IOException {
if (numSplits < 1) {
throw new IllegalArgumentException("Number of input splits has to be at least 1.");
}
numSplits = (this instanceof NonParallelInput) ? 1 : numSplits;
GenericInputSplit[] splits = new GenericInputSplit[numSplits];
for (int i = 0; i < splits.length; i++) {
splits[i] = new GenericInputSplit(i, numSplits);
}
return splits;
}
@Override
public DefaultInputSplitAssigner getInputSplitAssigner(GenericInputSplit[] splits) {
return new DefaultInputSplitAssigner(splits);
}
// --------------------------------------------------------------------------------------------
@Override
public void open(GenericInputSplit split) throws IOException {
this.partitionNumber = split.getSplitNumber();
}
@Override
public void close() throws IOException {}
}