pigpen.cascading.PigPenFunction Maven / Gradle / Ivy
/*
*
* Copyright 2015 Netflix, 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 pigpen.cascading;
import cascading.flow.FlowProcess;
import cascading.operation.BaseOperation;
import cascading.operation.Function;
import cascading.operation.FunctionCall;
import cascading.operation.OperationCall;
import cascading.tuple.Fields;
import clojure.lang.IFn;
public class PigPenFunction extends BaseOperation implements Function {
private static final IFn PREPARE = OperationUtil.getVar("prepare");
private static final IFn OPERATE = OperationUtil.getVar("function-operate");
private final String context;
public PigPenFunction(final String context, final Fields fields) {
super(fields);
this.context = context;
}
@Override
public void prepare(final FlowProcess flowProcess, final OperationCall operationCall) {
super.prepare(flowProcess, operationCall);
operationCall.setContext(PREPARE.invoke(this.context));
}
@Override
public void operate(final FlowProcess flowProcess, final FunctionCall functionCall) {
OPERATE.invoke(functionCall);
}
}