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

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Here is the source code for org.sift.batch.tuple.TupleLineMapper.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.net.URI;
import java.util.ArrayList;
import java.util.List;

import org.sift.runtime.Fields;
import org.sift.runtime.Tuple;
import org.springframework.batch.item.file.LineMapper;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.io.Resource;

/**
 * The <code>TupleLineMapper</code> is an implementation of the Spring Batch {@link LineMapper} that maps a single line into a {@link Tuple}
 * 
 * @author Regunath B
 * @version 1.0, 28 Jan 2013
 */
public class TupleLineMapper implements LineMapper<Tuple>, InitializingBean {

    /** The Resource instance that this LineMapper is mapping lines from */
    private Resource resource;

    /** The MultiThreadedMultiResourceItemReader instance that uses this LineMapper via the delegate reader*/
    private MultiThreadedMultiResourceItemReader<Tuple> itemReader;

    /**
     * Interface method implementation. Maps the input line into a {@link Tuple} with line number as key and the line contents as a single String value
     * @see org.springframework.batch.item.file.LineMapper#mapLine(java.lang.String, int)
     */
    public Tuple mapLine(String line, int lineNumber) throws Exception {
        Resource currentResource = this.itemReader == null ? this.resource : this.itemReader.getCurrentResource();
        URI reviewURI = new URI(currentResource.getFile().getAbsolutePath() + "#" + String.valueOf(lineNumber));
        Tuple tuple = new Tuple(Fields.KEY, Fields.SOURCES, Fields.VALUES);
        //Add key
        tuple.setValue(Fields.KEY, String.valueOf(lineNumber));
        //Add sources
        List<URI> sourceURI = new ArrayList<URI>();
        sourceURI.add(reviewURI);
        tuple.setValue(Fields.SOURCES, sourceURI);
        //Add values
        List<String> initialValues = new ArrayList<String>();
        initialValues.add(line);
        tuple.setValue(Fields.VALUES, initialValues);
        return tuple;
    }

    /**
     * Interface method implementation. Checks to see if atleast one Resource or MultiResourceItemReader is set
     * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
     */
    public void afterPropertiesSet() throws Exception {
        if (this.getResource() == null && this.itemReader == null) {
            throw new Exception("Atleast one of 'resource' or 'itemReader' must be set!");
        }
    }

    /** Getter/Setter methods */
    public Resource getResource() {
        return this.resource;
    }

    public void setResource(Resource resource) {
        this.resource = resource;
    }

    public MultiThreadedMultiResourceItemReader<Tuple> getItemReader() {
        return this.itemReader;
    }

    public void setItemReader(MultiThreadedMultiResourceItemReader<Tuple> itemReader) {
        this.itemReader = itemReader;
    }

}