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dimitra.ke
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package eu.dnetlib.data.search.transform.formatter;
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katerina.i
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import eu.dnetlib.data.search.transform.FormatterException;
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import eu.dnetlib.data.search.transform.utils.VelocityUtil;
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import eu.dnetlib.domain.data.SearchResult;
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import org.apache.commons.io.IOUtils;
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import org.apache.commons.lang.StringEscapeUtils;
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import org.apache.log4j.Logger;
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import org.apache.velocity.Template;
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import org.apache.velocity.VelocityContext;
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import org.apache.velocity.app.VelocityEngine;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.stream.StreamResult;
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import javax.xml.transform.stream.StreamSource;
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import java.io.InputStream;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.text.SimpleDateFormat;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.List;
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public class SimpleFormatter implements Formatter {
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private javax.xml.transform.Transformer xmlTransformer = null;
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private StringWriter xmlResultResource = new StringWriter();
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private Template t = null;
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private final Logger logger = Logger.getLogger(SimpleFormatter.class);
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public SimpleFormatter() throws FormatterException{
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StringWriter writer = null;
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InputStream inputStream = null;
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try {
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VelocityEngine ve = VelocityUtil.getEngine();
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String clean_xsl = "/eu/dnetlib/data/search/transform/config/omit-xml-declaration.xsl";
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t = ve.getTemplate("/eu/dnetlib/data/search/transform/config/format.vm", "UTF-8");
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inputStream = this.getClass().getResource(clean_xsl).openStream();
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writer = new StringWriter();
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IOUtils.copy(inputStream, writer);
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String xsl = writer.toString();
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synchronized(this) {
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xmlTransformer = TransformerFactory.newInstance().newTemplates(new StreamSource(new StringReader(xsl))).newTransformer();
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xmlTransformer.setOutputProperty("encoding", "UTF-8");
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}
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} catch (Exception e) {
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logger.error("Error while creating a velocity template.", e);
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throw new FormatterException("Error while creating a velocity template.", e);
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} finally {
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IOUtils.closeQuietly(writer);
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IOUtils.closeQuietly(inputStream);
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}
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}
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public SimpleFormatter(String template) throws FormatterException {
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StringWriter writer = null;
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InputStream inputStream = null;
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logger.debug("Creating formatter with template " + template);
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try {
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VelocityEngine ve = VelocityUtil.getEngine();
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String clean_xsl = "/eu/dnetlib/data/search/transform/config/omit-xml-declaration.xsl";
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t = ve.getTemplate("/eu/dnetlib/data/search/transform/config/" + template, "UTF-8");
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inputStream = this.getClass().getResource(clean_xsl).openStream();
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writer = new StringWriter();
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IOUtils.copy(inputStream, writer);
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String xsl = writer.toString();
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synchronized(this) {
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xmlTransformer = TransformerFactory.newInstance().newTemplates(new StreamSource(new StringReader(xsl))).newTransformer();
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}
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} catch (Exception e) {
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logger.error("Error while creating a velocity template.", e);
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throw new FormatterException("Error while creating a velocity template.", e);
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} finally {
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IOUtils.closeQuietly(writer);
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IOUtils.closeQuietly(inputStream);
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}
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}
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@Override
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public String format(SearchResult result) throws FormatterException {
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VelocityContext context = null;
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try {
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context = new VelocityContext();
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} catch (Exception e) {
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logger.error("Error while creating a Velocity context.", e);
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FormatterException fe = new FormatterException("Error while creating a Velocity context.", e);
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throw fe;
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}
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try {
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context.put("page", result.getPage());
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context.put("query", StringEscapeUtils.escapeXml(result.getQuery()));
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context.put("size", result.getSize());
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context.put("total", result.getTotal());
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context.put("locale", result.getLocale());
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context.put("fields", result.getFields());
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SimpleDateFormat sdf = new SimpleDateFormat("EEE, d MMM yy HH:mm:ss z");
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context.put("currentDate", sdf.format(new Date()));
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if(result.getSearchResults() == null)
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context.put("results",null);
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else {
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// logger.debug("After: " + clearDeclarations(result.getSearchResults()));
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context.put("results", clearDeclarations(result.getSearchResults()));
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}
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if (result.getBrowseResults() == null)
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context.put("bresults",null);
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else
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context.put("bresults", clearDeclarations(result.getBrowseResults()));
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StringWriter writer = new StringWriter();
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//logger.debug("formating with " + t.getName() + "and results " + result.getSearchResults());
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t.merge(context, writer);
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return writer.toString();
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} catch (Exception e) {
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String text = "Error while formatting.";
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if(result == null)
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text += " And result is null.";
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logger.error(text, e);
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FormatterException fe = new FormatterException("Error while formatting.", e);
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throw fe;
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}
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}
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public List<String> clearDeclarations(List<String> results) throws FormatterException{
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List<String> cleared = new ArrayList<String>();
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for(String result: results){
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xmlResultResource.getBuffer().setLength(0);
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try {
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xmlTransformer.transform(new StreamSource(new StringReader(result)), new StreamResult(xmlResultResource));
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} catch (Exception e) {
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logger.warn("Error transforming xml.", e);
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throw new FormatterException();
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}
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cleared.add(xmlResultResource.getBuffer().toString());
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}
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return cleared;
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}
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}
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