DatafileIterator.java

package dk.statsbiblioteket.medieplatform.autonomous.iterator.filesystem.transforming;

import dk.statsbiblioteket.medieplatform.autonomous.iterator.common.AttributeParsingEvent;
import dk.statsbiblioteket.medieplatform.autonomous.iterator.common.DataFileNodeBeginsParsingEvent;
import dk.statsbiblioteket.medieplatform.autonomous.iterator.common.DataFileNodeEndsParsingEvent;
import dk.statsbiblioteket.medieplatform.autonomous.iterator.common.DelegatingTreeIterator;
import dk.statsbiblioteket.medieplatform.autonomous.iterator.common.NodeBeginsParsingEvent;
import dk.statsbiblioteket.medieplatform.autonomous.iterator.common.NodeEndParsingEvent;
import dk.statsbiblioteket.medieplatform.autonomous.iterator.filesystem.FileAttributeParsingEvent;

import java.io.File;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;

/**
 * This class represents the virtual folder that will be created for all datafiles. Each datafile will be created
 * as a folder containing one file, named content, which represents the content of the datafile
 */
public class DatafileIterator extends CommonTransformingIterator {


    private static final String CONTENTS = "contents";

    public DatafileIterator(File dataFile, File batchFolder, String checksumPostfix, String groupingChar) {
        super(dataFile, batchFolder, null, checksumPostfix, groupingChar);
    }

    @Override
    protected Iterator<DelegatingTreeIterator> initializeChildrenIterator() {
        //returns empty iterator, datafiles will have no children
        return Collections.emptyIterator();
    }

    @Override
    protected Iterator<File> initilizeAttributeIterator() {
        return Arrays.asList(id).iterator();
    }

    @Override
    protected AttributeParsingEvent makeAttributeEvent(File nodeID, File attributeID) {
        return new FileAttributeParsingEvent(
                toPathID(new File(attributeID, CONTENTS)), attributeID, getChecksumPostfix());

    }

    /**
     * In this implementation, the location is the absolute path to the directory represented by this node.
     * @return
     */
    @Override
    protected NodeEndParsingEvent createNodeEndsParsingEvent() {
        return new DataFileNodeEndsParsingEvent(getIdOfNode(), id.getAbsolutePath());
    }

    /**
         * In this implementation, the location is the absolute path to the directory represented by this node.
         * @return
         */
    @Override
    protected NodeBeginsParsingEvent createNodeBeginsParsingEvent() {
        return new DataFileNodeBeginsParsingEvent(getIdOfNode(), id.getAbsolutePath());
    }
}