/*
* Copyright (C) 2014 The Calrissian Authors
*
* 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 org.calrissian.flowmix.api.builder;
import java.util.ArrayList;
import java.util.List;
import org.calrissian.flowmix.core.model.op.SelectOp;
public class SelectBuilder extends AbstractOpBuilder {
private List<String> fieldsList = new ArrayList<String>();
public SelectBuilder(StreamBuilder fob) {
super(fob);
}
public SelectBuilder fields(String... fields) {
for(String field : fields)
fieldsList.add(field);
return this;
}
public StreamBuilder end() {
if(fieldsList == null || fieldsList.size() == 0)
throw new RuntimeException("Selector operator needs to select at least 1 field");
getStreamBuilder().addFlowOp(new SelectOp(fieldsList));
return getStreamBuilder();
}
}