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package eu.dnetlib.oai.parser;
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import java.io.StringReader;
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import java.util.List;
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import java.util.Map.Entry;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.dom4j.Document;
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import org.dom4j.DocumentException;
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import org.dom4j.Node;
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import org.dom4j.io.SAXReader;
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import com.google.common.base.Function;
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import com.google.common.collect.ArrayListMultimap;
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import com.google.common.collect.Iterables;
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import com.google.common.collect.Multimap;
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import eu.dnetlib.oai.PublisherField;
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/**
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* An instance of this class can parse an XML record and extract the information needed to store the record in a publisher store.
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*
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* @author alessia
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*/
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public class PublisherRecordParser {
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private static final Log log = LogFactory.getLog(PublisherRecordParser.class); // NOPMD by marko on 11/24/08 5:02 PM
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private final SAXReader saxReader = new SAXReader();
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/**
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* List of the indices of the target store.
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*/
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private List<PublisherField> storeIndices;
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public PublisherRecordParser(final List<PublisherField> storeIndices) {
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super();
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this.storeIndices = storeIndices;
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}
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public PublisherRecordParser() {
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super();
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// TODO Auto-generated constructor stub
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}
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/**
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* Parses the record and returns a map where a key is the name of an index, the value is the value in the record at the xpath specificed
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* in this.storeIndices.
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*
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* @param record
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* the XML string to parse.
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* @return a Multimap describing the values to be indexed for this record.
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*/
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@SuppressWarnings({ "unchecked", "rawtypes" })
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public Multimap<String, String> parseRecord(final String record) {
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Multimap<String, String> recordProps = ArrayListMultimap.create();
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try {
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final Document doc = this.saxReader.read(new StringReader(record));
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for (final PublisherField field : this.storeIndices) {
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for (final Entry<String, String> indexEntry : field.getSources().entries()) {
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// each xpath can return a list of nodes or strings, depending on the xpath
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final List xPathResult = doc.selectNodes(indexEntry.getValue());
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if ((xPathResult != null) && !xPathResult.isEmpty()) {
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if (containsStrings(xPathResult)) {
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recordProps.putAll(field.getFieldName(), xPathResult);
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} else {
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if (containsNodes(xPathResult)) {
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recordProps.putAll(field.getFieldName(), Iterables.transform(xPathResult, new Function<Object, String>() {
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@Override
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public String apply(final Object obj) {
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if (obj == null) { return ""; }
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final Node node = (Node) obj;
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return node.getText();
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}
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}));
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}
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}
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}
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}
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}
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} catch (final DocumentException e) {
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log.fatal("Can't parse record");
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recordProps = null;
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}
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return recordProps;
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}
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@SuppressWarnings("rawtypes")
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private boolean containsStrings(final List objects) {
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final Object first = objects.get(0);
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return first instanceof String;
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}
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@SuppressWarnings("rawtypes")
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private boolean containsNodes(final List objects) {
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final Object first = objects.get(0);
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return first instanceof Node;
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}
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public List<PublisherField> getStoreIndices() {
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return this.storeIndices;
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}
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public void setStoreIndices(final List<PublisherField> storeIndices) {
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this.storeIndices = storeIndices;
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}
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public SAXReader getSaxReader() {
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return this.saxReader;
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}
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}
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