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package eu.dnetlib.parthenos.publisher;
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import java.io.StringReader;
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import java.util.Map;
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import java.util.Map.Entry;
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import javax.xml.transform.sax.SAXSource;
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import com.google.common.collect.Maps;
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import net.sf.saxon.s9api.*;
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import net.sf.saxon.s9api.Serializer.Property;
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import org.springframework.stereotype.Component;
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import org.xml.sax.InputSource;
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/**
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* Created by alessia on 10/03/17.
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*/
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@Component
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public class SaxonHelper {
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private Processor xmlProcessor = new Processor(false);
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public Helper help(){
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return new Helper();
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}
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public class Helper{
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private Serializer serializer;
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Helper() {
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this.serializer = xmlProcessor.newSerializer();
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serializer.setOutputProperty(Property.METHOD, "xml");
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serializer.setOutputProperty(Property.INDENT, "yes");
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}
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public Helper setSerializerProperty(Property p, String value){
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serializer.setOutputProperty(p, value);
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return this;
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}
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public XdmNode parseXML(final String xmlSource) throws SaxonApiException {
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SAXSource source = new SAXSource(new InputSource(new StringReader(xmlSource)));
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DocumentBuilder docBuilder = xmlProcessor.newDocumentBuilder();
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return docBuilder.build(source);
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}
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/**
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* Evaluate the given xpath on the given XML source.
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*
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* @param xmlSource XML source string
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* @param xpath the xpath to evaluate
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* @param namespaces the map of namespaces to be declared to evaluate the xpath
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* @return an XdmItem resulting from the evaluation of the xpath. Returns null if nothing matches.
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*/
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public XdmItem evaluateSingle(final String xmlSource, final String xpath, final Map<String, String> namespaces) throws SaxonApiException {
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XPathSelector xpathSelector = prepareXPathSelector(xpath, namespaces);
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return evaluateSingle(xmlSource, xpathSelector);
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}
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/**
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* Applies the given xpath selector on the given XML source.
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*
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* @param xmlSource XML source string
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* @param xpathSelector the configured xpath selector to apply
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* @return an XdmItem resulting from the evaluation of the xpath. Returns null if nothing matches.
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*/
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public XdmItem evaluateSingle(final String xmlSource, final XPathSelector xpathSelector) throws SaxonApiException {
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XdmNode xdmNode = parseXML(xmlSource);
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xpathSelector.setContextItem(xdmNode);
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return xpathSelector.evaluateSingle();
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}
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/**
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* Get an XPathSelector for the given xpath and namespaces.
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* @param xpath the xpath
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* @param namespaces the map of namespaces to be declared to evaluate the xpath
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* @return XPathSelector
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* @throws SaxonApiException
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*/
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public XPathSelector prepareXPathSelector(final String xpath,final Map<String, String> namespaces) throws SaxonApiException {
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XPathCompiler compiler = xmlProcessor.newXPathCompiler();
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for (Entry<String, String> ns : namespaces.entrySet()) {
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compiler.declareNamespace(ns.getKey(), ns.getValue());
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}
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XPathExecutable xpathExecutable = compiler.compile(xpath);
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XPathSelector xpathSelector = xpathExecutable.load();
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return xpathSelector;
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}
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/**
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* Get an XPathSelector for the given xpath and namespaces.
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* @param xpath the xpath
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* @param nsPrefix namespace prefix
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* @param ns namespace URI
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* @return XPathSelector
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* @throws SaxonApiException
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*/
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public XPathSelector prepareXPathSelector(final String xpath,final String nsPrefix, final String ns) throws SaxonApiException {
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Map<String, String> map = Maps.newHashMap();
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map.put(nsPrefix, ns);
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return prepareXPathSelector(xpath, map);
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}
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/**
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* Evaluate the given xpath on the given XML source.
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* @param xmlSource XML source string
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* @param xpath the xpath to evaluate
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* @param nsPrefix namespace prefix
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* @param ns namespace URI
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* @return an XdmItem resulting from the evaluation of the xpath. Returns null if nothing matches.
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* @throws SaxonApiException
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*
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*/
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public XdmItem evaluateSingle(final String xmlSource, final String xpath, final String nsPrefix, final String ns) throws SaxonApiException {
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Map<String, String> map = Maps.newHashMap();
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map.put(nsPrefix, ns);
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return evaluateSingle(xmlSource, xpath, map);
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}
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/**
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* Evaluate the given xpath on the given XML source.
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*
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* @param xmlSource XML source string
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* @param xpath the xpath to evaluate. xpath must evaluate to an xdmNode
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* @param namespaces the map of namespaces to be declared to evaluate the xpath
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* @return the XML serialization as string of the XdmItem resulting from the evaluation of the xpath. Returns null if nothing matches.
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* @throws ClassCastException if xpath is not evaluated to a node.
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*/
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public String evaluateSingleAsString(final String xmlSource, final String xpath, final Map<String, String> namespaces) throws SaxonApiException {
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XdmItem item = evaluateSingle(xmlSource, xpath, namespaces);
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if(item != null){
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XdmNode node = (XdmNode) item;
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return serializer.serializeNodeToString(node);
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}
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else return null;
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}
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/**
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* Applies the given xpath selector on the given XML source.
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*
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* @param xmlSource XML source string
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* @param xpathSelector the configured xpath selector to apply
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* @return the XML serialization as string of the XdmItem resulting from the evaluation of the xpath. Returns null if nothing matches.
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* @throws ClassCastException if xpath is not evaluated to a node.
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*/
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public String evaluateSingleAsString(final String xmlSource, final XPathSelector xpathSelector) throws SaxonApiException {
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XdmItem item = evaluateSingle(xmlSource, xpathSelector);
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if(item != null){
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XdmNode node = (XdmNode) item;
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return serializer.serializeNodeToString(node);
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}
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else return null;
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}
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/**
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* Evaluate the given xpath on the given XML source.
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*
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* @param xmlSource XML source string
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* @param xpath the xpath to evaluate. xpath must evaluate to an xdmNode
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* @param nsPrefix namespace prefix
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* @param ns namespace URI
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* @return the XML serialization as string of the XdmItem resulting from the evaluation of the xpath. Returns null if nothing matches.
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* @throws ClassCastException if xpath is not evaluated to a node.
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*/
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public String evaluateSingleAsString(final String xmlSource, final String xpath, final String nsPrefix, final String ns) throws SaxonApiException {
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Map<String, String> map = Maps.newHashMap();
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map.put(nsPrefix, ns);
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return evaluateSingleAsString(xmlSource, xpath, map);
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}
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}
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}
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