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+/*
+* Copyright 2008 Federal Chancellery Austria and
+* Graz University of Technology
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+package at.gv.egiz.idlink;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import javax.xml.transform.Result;
+import javax.xml.transform.Source;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerConfigurationException;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.stream.StreamSource;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.w3c.dom.Text;
+
+public class IdentityLinkTransformer {
+
+ private class IdLTransformer {
+
+ /**
+ * Is transformer in use?
+ */
+ private boolean inUse = false;
+
+ /**
+ * How often has this transformer been used?
+ */
+ private int timesUsed = 0;
+
+ /**
+ * The time this transformer has been created.
+ */
+ private long created;
+
+ /**
+ * When has this transformer been used the last time?
+ */
+ private long lastTimeUsed;
+
+ /**
+ * Average performance in milliseconds.
+ */
+ private long time;
+
+ /**
+ * Time used for initialization.
+ */
+ private long initTime;
+
+ /**
+ * The stylesheet transformer.
+ */
+ private Transformer transformer;
+
+ /**
+ * Stylesheet URL.
+ */
+ private String stylesheetURL;
+
+ /**
+ *
+ * @param stylesheetURL
+ * @throws IOException
+ * @throws TransformerConfigurationException
+ */
+ public IdLTransformer(String stylesheetURL) throws IOException, TransformerConfigurationException {
+
+ created = System.currentTimeMillis();
+
+ // TODO: implement stylesheet cache
+ this.stylesheetURL = stylesheetURL;
+ URL url = new URL(stylesheetURL);
+
+ if (!"http".equalsIgnoreCase(url.getProtocol()) && !"https".equalsIgnoreCase(url.getProtocol())) {
+ throw new MalformedURLException("Protocol " + url.getProtocol() + " not supported for IssuerTemplate URL.");
+ }
+ StreamSource source = new StreamSource(url.openStream());
+
+ transformer = factory.newTransformer(source);
+
+ initTime = System.currentTimeMillis() - created;
+
+ }
+
+ public void transform(Source xmlSource, Result outputTarget) throws TransformerException {
+ long t0 = System.currentTimeMillis();
+ try {
+ transformer.transform(xmlSource, outputTarget);
+ } catch (TransformerException e) {
+ throw e;
+ } finally {
+ inUse = false;
+ long t1 = System.currentTimeMillis();
+ time += (t1 - t0);
+ timesUsed++;
+ lastTimeUsed = System.currentTimeMillis();
+ }
+ }
+
+ /**
+ * @return <code>true</code> if this transformer is in use, or <code>false</code> otherwise
+ */
+ public boolean isInUse() {
+ return inUse;
+ }
+
+ @Override
+ public String toString() {
+ StringBuffer str = new StringBuffer();
+ str.append("Transformer ").append(stylesheetURL)
+ .append("\n created ").append(new Date(created)).append(" used ").append(
+ timesUsed).append(" times, (init ").append(initTime).append("ms / ")
+ .append(((float) time) / timesUsed).append("ms avg) last time ").append(new Date(lastTimeUsed));
+ return str.toString();
+ }
+
+ }
+
+ /**
+ * The transfomer factory.
+ */
+ private static TransformerFactory factory;
+
+ /**
+ * The instance to be returned by {@link #getInstance()}.
+ */
+ private static IdentityLinkTransformer instance;
+
+ /**
+ * Returns an instance of this <code>IdentityLinkTransfomer</code>.
+ *
+ * @return an instance of this <code>IdentityLinkTransformer</code>
+ */
+ public static IdentityLinkTransformer getInstance() {
+ if (instance == null) {
+ instance = new IdentityLinkTransformer();
+ factory = TransformerFactory.newInstance();
+ }
+ return instance;
+ }
+
+ /**
+ * Sets the given <code>domainIdentifier</code> on the corresponding
+ * node of the given <code>idLink</code>.
+ * <p>This method may be used to cope with a flaw in the IssuerTemplate-Stylesheets
+ * used to transform a <code>CompressedIdentitiyLink</code> into an
+ * <code>IdentityLink</code>. Some IssuerTemplate-Stylesheets do not
+ * consider the <code>pr:Type</code> element value of the
+ * <code>CompressedIdentityLink</code> and render a <code>pr:Type</code>
+ * element value of <code>urn:publicid:gv.at:baseid</code>
+ * into the <code>IdentityLink</code> structure. This method allows to
+ * set the <code>pr:Type</code> element value on the given <code>idLink</code>
+ * after the transformation.
+ * </p>
+ *
+ * @param idLink the <code>IdentityLink</code> element or one of it's ancestors.
+ * Must not be <code>null</code>.
+ *
+ * @param domainIdentifier the value to be set for the <code>pr:Type</code> element
+ *
+ * @throws NullPointerException if <code>idLink</code> is <code>null</code>.
+ */
+ public static void setDomainIdentifier(Node idLink, String domainIdentifier) {
+
+ Element element;
+ if (idLink instanceof Element) {
+ element = (Element) idLink;
+ } else if (idLink instanceof Document) {
+ element = ((Document) idLink).getDocumentElement();
+ } else if (idLink != null) {
+ Document document = idLink.getOwnerDocument();
+ element = document.getDocumentElement();
+ } else {
+ throw new NullPointerException("Parameter 'idLink' must no be null.");
+ }
+
+ NodeList nodeList = element.getElementsByTagNameNS(
+ "http://reference.e-government.gv.at/namespace/persondata/20020228#",
+ "Type");
+
+ for (int i = 0; i < nodeList.getLength(); i++) {
+ if (nodeList.item(i) instanceof Element) {
+ Element typeElement = (Element) nodeList.item(i);
+ NodeList children = typeElement.getChildNodes();
+ for (int j = 0; j < children.getLength(); j++) {
+ if (children.item(j) instanceof Text) {
+ ((Text) children.item(j)).setNodeValue(domainIdentifier);
+ }
+ }
+ }
+ }
+
+ }
+
+ /**
+ * The pool of <code>Transformer</code>.
+ */
+ private Map<String, List<IdLTransformer>> pool;
+
+ /**
+ * Private constructor.
+ */
+ private IdentityLinkTransformer() {
+ pool = new HashMap<String, List<IdLTransformer>>();
+ }
+
+ private synchronized IdLTransformer getFreeTransfomer(String stylesheetURL) throws TransformerConfigurationException, IOException {
+
+ IdLTransformer transformer = null;
+
+ List<IdLTransformer> transfomerList = pool.get(stylesheetURL);
+ if (transfomerList == null) {
+ transfomerList = new ArrayList<IdLTransformer>();
+ pool.put(stylesheetURL, transfomerList);
+ }
+
+ for (IdLTransformer candTransformer : transfomerList) {
+ if (!candTransformer.inUse) {
+ transformer = candTransformer;
+ break;
+ }
+ }
+
+ if (transformer == null) {
+ transformer = new IdLTransformer(stylesheetURL);
+ transfomerList.add(transformer);
+ }
+
+ transformer.inUse = true;
+ return transformer;
+
+ }
+
+ public void transformIdLink(String stylesheetURL, Source source, Result result) throws IOException, TransformerException {
+ IdLTransformer transformer = getFreeTransfomer(stylesheetURL);
+ transformer.transform(source, result);
+ }
+
+ public String getStatistics() {
+
+ StringBuffer str = new StringBuffer();
+ Iterator<String> keys = pool.keySet().iterator();
+ int count = 0;
+ while (keys.hasNext()) {
+ String stylesheetURL = (String) keys.next();
+ str.append("Stylesheet URL: ").append(stylesheetURL);
+ Iterator<IdLTransformer> transformer = pool.get(stylesheetURL).iterator();
+ while (transformer.hasNext()) {
+ IdLTransformer idLTransformer = (IdLTransformer) transformer.next();
+ str.append("\n ").append(idLTransformer);
+ count++;
+ }
+ }
+ str.append("\n(").append(count).append(" transformer)");
+ return str.toString();
+ }
+
+}