111 lines
3.4 KiB
Java
111 lines
3.4 KiB
Java
/**
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*
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*/
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package org.gcube.datatransfer.resolver.gis.util;
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import java.io.BufferedInputStream;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.List;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.transform.OutputKeys;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.stream.StreamResult;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import org.w3c.dom.NodeList;
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/**
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* The Class GetResponseRecordFilter.
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*
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* @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it Jun 16, 2016
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*/
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public class GetResponseRecordFilter {
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public static Logger logger = LoggerFactory.getLogger(GetResponseRecordFilter.class);
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/**
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* Delete summary record.
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*
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* @param doc
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* the doc
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* @param identifier
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* the identifier
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*/
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private static void deleteSummaryRecord(Document doc, String identifier) {
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// <csw:SummaryRecord> list
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NodeList nodes = doc.getElementsByTagName("csw:SummaryRecord");
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logger.trace("SummaryRecord are: " + nodes.getLength());
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for (int i = 0; i < nodes.getLength(); i++) {
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Element summaryRecord = (Element) nodes.item(i);
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// <dc:identifier>
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Element id = (Element) summaryRecord.getElementsByTagName("dc:identifier").item(0);
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String idValue = id.getTextContent();
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logger.trace("Summary dc:identifier is: " + idValue);
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if (idValue.equals(identifier)) {
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summaryRecord.getParentNode().removeChild(summaryRecord);
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logger.trace("Removed child " + idValue);
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}
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}
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}
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/**
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* Removes the summary ids by list ids.
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*
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* @param getRecordsResponse the get records response
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* @param idsToRemove the ids to remove
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* @return the input stream
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* @throws IOException Signals that an I/O exception has occurred.
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*/
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public static InputStream removeSummaryIdsByListIds(InputStream getRecordsResponse, List<String> idsToRemove) throws IOException {
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try {
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// logger.trace("getRecordsResponse is: "+IOUtils.toString(getRecordsResponse));
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BufferedInputStream bis = new BufferedInputStream(getRecordsResponse);
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DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
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dbf.setValidating(false);
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DocumentBuilder db = dbf.newDocumentBuilder();
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Document doc = db.parse(bis);
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for (String identifier : idsToRemove) {
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deleteSummaryRecord(doc, identifier);
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}
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return documentToInputStream(doc);
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}
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catch (Exception e) {
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logger.error("An error occurred during removing IDS by List: ", e);
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return getRecordsResponse;
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}
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}
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/**
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* Document to input stream.
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*
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* @param xml the xml
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* @return the input stream
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* @throws Exception the exception
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*/
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private static final InputStream documentToInputStream(Document xml) throws Exception {
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Transformer tf = TransformerFactory.newInstance().newTransformer();
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tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
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tf.setOutputProperty(OutputKeys.INDENT, "yes");
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ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
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StreamResult outputTarget = new StreamResult(outputStream);
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tf.transform(new DOMSource(xml), outputTarget);
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return new ByteArrayInputStream(outputStream.toByteArray());
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// return out.toString();
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}
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}
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