org.sift.batch.tuple.TupleWriter.java Source code

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Here is the source code for org.sift.batch.tuple.TupleWriter.java

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/*
 * Copyright 2012-2015, the original author or 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.sift.batch.tuple;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

import org.sift.runtime.Fields;
import org.sift.runtime.Tuple;
import org.sift.runtime.spi.OutputCollector;
import org.springframework.batch.item.ItemWriter;

/**
 * The <code>TupleWriter</code> is a Spring Batch {@link ItemWriter} implementation that writes the output to the configured
 * {@link OutputCollector} instance
 * 
 * @author Regunath B
 * @version 1.0, 28 Jan 2013
 */
public class TupleWriter implements ItemWriter<List<Tuple>> {

    /** The OutputCollector to write the output to*/
    private OutputCollector collector;

    /**
     * Interface method implementation. Writes the out to the configured {@link OutputCollector}
     * @see org.springframework.batch.item.ItemWriter#write(java.util.List)
     */
    @Override
    public void write(List<? extends List<Tuple>> tuples) throws Exception {
        List<Tuple> containedTuples = new LinkedList<Tuple>();
        for (List<Tuple> tList : tuples) {
            for (Tuple t : tList) {
                if (t.getString(Fields.KEY).equals(Tuple.UNDEFINED_KEY)) { // it is an collection of Tuple instances
                    Collections.addAll(containedTuples, t.getList(Fields.VALUES).toArray(new Tuple[0]));
                } else {
                    Collections.addAll(containedTuples, t);
                }
            }
        }
        this.collector.setTuples(containedTuples.toArray(new Tuple[0]));
    }

    /** Getter/Setter methods */
    public OutputCollector getCollector() {
        return this.collector;
    }

    public void setCollector(OutputCollector collector) {
        this.collector = collector;
    }
}