io.cdap.cdap.internal.app.runtime.batch.dataset.input.MapperInput Maven / Gradle / Ivy
/*
* Copyright © 2016 Cask Data, Inc.
*
* Licensed 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 io.cdap.cdap.internal.app.runtime.batch.dataset.input;
import io.cdap.cdap.api.data.batch.InputFormatProvider;
import java.util.Map;
import javax.annotation.Nullable;
import org.apache.hadoop.mapreduce.Mapper;
/**
* Encapsulates {@link InputFormatProvider} and a {@link Mapper} to use for that input.
*/
public class MapperInput {
private final String alias;
private final InputFormatProvider inputFormatProvider;
private final String inputFormatClassName;
private final Map inputFormatConfiguration;
private final Class mapper;
/**
* Creates an instance of MapperInput with the given InputFormatProvider and specified Mapper
* class.
*/
public MapperInput(String alias, InputFormatProvider inputFormatProvider,
@Nullable Class mapper) {
this.alias = alias;
this.inputFormatProvider = inputFormatProvider;
this.inputFormatClassName = inputFormatProvider.getInputFormatClassName();
this.inputFormatConfiguration = inputFormatProvider.getInputFormatConfiguration();
this.mapper = mapper;
if (inputFormatClassName == null) {
throw new IllegalArgumentException(
"Input '" + alias + "' provided null as the input format");
}
if (inputFormatConfiguration == null) {
throw new IllegalArgumentException(
"Input '" + alias + "' provided null as the input format configuration");
}
}
public String getAlias() {
return alias;
}
public InputFormatProvider getInputFormatProvider() {
return inputFormatProvider;
}
public String getInputFormatClassName() {
return inputFormatClassName;
}
public Map getInputFormatConfiguration() {
return inputFormatConfiguration;
}
@Nullable
public Class getMapper() {
return mapper;
}
}