/**
* 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.falcon.designer.primitive;
import org.apache.falcon.designer.schema.RelationalData;
import javax.annotation.Nonnull;
import java.util.Collections;
import java.util.List;
/**
* Transform is a foundational primitive in Falcon designer. All well
* understood data transformations are to be implemented as a Transform.
*
* A transform would typically consume one or more data inputs conforming
* to a schema and would produce one or more output typically with an uniform schema.
*
*/
public abstract class Transform extends Primitive<Transform> {
protected List<RelationalData> inputData;
protected List<RelationalData> outputData;
/** Empty constructor to be used only for deserialization
* and cloning. Not otherwise.
*/
protected Transform() {
}
/**
* Setter typically used for deserialization & cloning.
*
* @param inputData - List of input data
*/
protected void setInputData(@Nonnull List<RelationalData> inputData) {
this.inputData = inputData;
}
/**
* Setter typically used for deserialization & cloning.
*
* @param outputData - List of output data
*/
protected void setOutputData(@Nonnull List<RelationalData> outputData) {
this.outputData = outputData;
}
/**
* Each Transform by default requires one or more input data sets
* and produces a single output data set.
*
* @param inData - List of input data sets for this transform
* @param outData - List of Output data produced by this transform
*/
protected Transform(@Nonnull List<RelationalData> inData, @Nonnull List<RelationalData> outData) {
inputData = Collections.unmodifiableList(inData);
outputData = Collections.unmodifiableList(outData);
}
@Nonnull
public List<RelationalData> getInputData() {
return inputData;
}
@Nonnull
public List<RelationalData> getOutputData() {
return outputData;
}
}