53 lines
1.3 KiB
Java
53 lines
1.3 KiB
Java
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package eu.dnetlib.pace.model;
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import java.util.Comparator;
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import com.google.common.collect.Iterables;
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import eu.dnetlib.pace.clustering.NGramUtils;
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/**
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* The Class MapDocumentComparator.
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*/
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public class MapDocumentComparator implements Comparator<Document> {
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/** The comparator field. */
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private String comparatorField;
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private final FieldList emptyField = new FieldListImpl();
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/**
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* Instantiates a new map document comparator.
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*
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* @param comparatorField
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* the comparator field
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*/
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public MapDocumentComparator(final String comparatorField) {
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this.comparatorField = comparatorField;
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}
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/*
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* (non-Javadoc)
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* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
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*/
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@Override
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public int compare(final Document d1, final Document d2) {
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if (d1.values(comparatorField).isEmpty() || d2.values(comparatorField).isEmpty())
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return 0;
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final String o1 = Iterables.getFirst(d1.values(comparatorField), emptyField).stringValue();
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final String o2 = Iterables.getFirst(d2.values(comparatorField), emptyField).stringValue();
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if ((o1 == null) || (o2 == null))
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return 0;
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final String to1 = NGramUtils.cleanupForOrdering(o1);
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final String to2 = NGramUtils.cleanupForOrdering(o2);
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return to1.compareTo(to2);
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}
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}
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