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OpenSearchServer is a powerful, enterprise-class, search engine program. Using the web user interface, the crawlers (web, file, database, ...) and the REST/RESTFul API you will be able to integrate quickly and easily advanced full-text search capabilities in your application. OpenSearchServer runs on Windows and Linux/Unix/BSD.
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/**   
 * License Agreement for OpenSearchServer
 *
 * Copyright (C)2011-2012 Emmanuel Keller / Jaeksoft
 * 
 * http://www.open-search-server.com
 * 
 * This file is part of OpenSearchServer.
 *
 * OpenSearchServer is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 * OpenSearchServer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with OpenSearchServer. 
 *  If not, see .
 **/
package com.jaeksoft.searchlib.render;

/**
 * @author naveen
 * 
 */
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.xpath.XPathExpressionException;

import org.apache.commons.lang3.StringEscapeUtils;
import org.xml.sax.SAXException;

import com.jaeksoft.searchlib.SearchLibException;
import com.jaeksoft.searchlib.facet.Facet;
import com.jaeksoft.searchlib.facet.FacetCounter;
import com.jaeksoft.searchlib.facet.FacetField;
import com.jaeksoft.searchlib.facet.FacetList;
import com.jaeksoft.searchlib.function.expression.SyntaxError;
import com.jaeksoft.searchlib.query.ParseException;
import com.jaeksoft.searchlib.request.AbstractSearchRequest;
import com.jaeksoft.searchlib.request.ReturnField;
import com.jaeksoft.searchlib.result.AbstractResultSearch;
import com.jaeksoft.searchlib.result.ResultDocument;
import com.jaeksoft.searchlib.schema.FieldValueItem;
import com.jaeksoft.searchlib.snippet.SnippetField;
import com.jaeksoft.searchlib.web.ServletTransaction;

public class RenderOpenSearch implements Render {

	private PrintWriter writer;
	private AbstractResultSearch result;
	private AbstractSearchRequest searchRequest;
	private Matcher controlMatcher;
	private String serverURL;
	private String outputEncoding;

	public RenderOpenSearch(AbstractResultSearch result, String serverURL, String outputEncoding) {
		this.result = result;
		this.searchRequest = result.getRequest();
		this.serverURL = serverURL;
		Pattern p = Pattern.compile("\\p{Cntrl}");
		controlMatcher = p.matcher("");
		this.outputEncoding = outputEncoding;
	}

	private String xmlTextRender(String text) {
		controlMatcher.reset(text);
		return StringEscapeUtils.escapeXml(controlMatcher.replaceAll(""));
	}

	private void renderPrefix() throws ParseException, SyntaxError, SearchLibException, IOException {
		String encoding = null;
		if (outputEncoding != null && !outputEncoding.equals(""))
			encoding = outputEncoding;
		else
			encoding = "UTF-8";
		writer.println("");
		writer.println("");
		writer.println("");
		writer.println("\t");
		writer.print("OpenSearchServer: ");
		writer.print(StringEscapeUtils.escapeXml(searchRequest.getQueryString()));
		writer.print("\t");
		writer.println("\t");
		writer.print("Search results for ");
		writer.print("\"");
		writer.print(StringEscapeUtils.escapeXml(searchRequest.getQueryString()));
		writer.print("\"");
		writer.print("\t");
		writer.println("\t");
		writer.print(StringEscapeUtils.escapeXml(serverURL));
		writer.print("\t");

	}

	private void renderSuffix() {
		writer.println("");
		writer.println("");
	}

	private void renderDocuments() throws IOException, ParseException, SyntaxError, XPathExpressionException,
			ParserConfigurationException, SAXException, SearchLibException, TransformerConfigurationException {
		AbstractSearchRequest searchRequest = result.getRequest();
		int start = searchRequest.getStart();
		int end = result.getDocumentCount() + searchRequest.getStart();
		writer.println("\t");
		writer.print(result.getNumFound());
		writer.print("\t");

		writer.println("\t");
		writer.print(searchRequest.getStart());
		writer.print("\t");

		writer.println("\t");
		writer.print(searchRequest.getRows());
		writer.print("\t");

		writer.println("\t");
		for (int i = start; i < end; i++)
			this.renderDocument(i);

	}

	private void renderDocument(int pos) throws IOException, ParseException, SyntaxError, XPathExpressionException,
			ParserConfigurationException, SAXException, SearchLibException, TransformerConfigurationException {

		writer.println("");
		ResultDocument doc = result.getDocument(pos, null);
		for (SnippetField field : searchRequest.getSnippetFieldList())
			renderSnippetValue(doc, field);

		for (ReturnField field : searchRequest.getReturnFieldList())
			renderField(doc, field);

		int cc = result.getCollapseCount(pos);
		if (cc > 0) {
			writer.print("\t\t");
			writer.print(cc);
			writer.println("");
		}
		writer.println("\t");
	}

	private void renderField(ResultDocument doc, ReturnField field) throws IOException, XPathExpressionException,
			ParserConfigurationException, SAXException, TransformerConfigurationException, SearchLibException {
		String fieldName = field.getName();
		List values = doc.getValues(field);
		String openSearchtitleField = getFieldMap("opensearch", "title");
		String openSearchDescriptionField = getFieldMap("opensearch", "description");
		String openSearchUrlField = getFieldMap("opensearch", "url");
		if (values != null)
			for (FieldValueItem v : values) {

				if (openSearchtitleField != null && openSearchtitleField.equalsIgnoreCase(fieldName)) {
					writer.print("\t");
					writer.print(StringEscapeUtils.escapeXml(v.getValue()));
					writer.println("");
				} else if (openSearchDescriptionField != null
						&& openSearchDescriptionField.equalsIgnoreCase(fieldName)) {
					writer.print("\t");
					writer.print(StringEscapeUtils.escapeXml(v.getValue()));
					writer.println("");
				} else if (openSearchUrlField != null && openSearchUrlField.equalsIgnoreCase(fieldName)) {
					writer.print("\t");
					writer.print(StringEscapeUtils.escapeXml(v.getValue()));
					writer.println("");
				} else {
					writer.print("\t\t');

					writer.print(xmlTextRender(v.getValue()));
					writer.print("');
				}
			}

	}

	private String getFieldMap(String apiName, String field)
			throws XPathExpressionException, ParserConfigurationException, SAXException, IOException,
			TransformerConfigurationException, SearchLibException {
		return searchRequest.getConfig().getApiManager().getMappedValue(apiName, field);
	}

	private void renderSnippetValue(ResultDocument doc, SnippetField field)
			throws IOException, XPathExpressionException, ParserConfigurationException, SAXException,
			TransformerConfigurationException, SearchLibException {
		String fieldName = field.getName();
		List snippets = doc.getSnippetValues(field);
		if (snippets == null)
			return;
		String openSearchtitleField = getFieldMap("opensearch", "title");
		String openSearchDescriptionField = getFieldMap("opensearch", "description");
		String openSearchUrlField = getFieldMap("opensearch", "url");
		for (FieldValueItem snippet : snippets) {

			if (openSearchtitleField != null && openSearchtitleField.equalsIgnoreCase(fieldName)) {
				writer.print("\t");
				writer.print(StringEscapeUtils.escapeXml(snippet.getValue()));
				writer.println("");
			} else if (openSearchDescriptionField != null && openSearchDescriptionField.equalsIgnoreCase(fieldName)) {
				writer.print("\t");
				writer.print(StringEscapeUtils.escapeXml(snippet.getValue()));
				writer.println("");
			} else if (openSearchUrlField != null && openSearchUrlField.equalsIgnoreCase(fieldName)) {
				writer.print("\t");
				writer.print(StringEscapeUtils.escapeXml(snippet.getValue()));
				writer.println("");
			} else {
				writer.print("\t\t');
				writer.print(xmlTextRender(snippet.getValue()));
				writer.print("');
			}
		}

	}

	private void renderFacet(Facet facet) throws Exception {
		FacetField facetField = facet.getFacetField();
		writer.print("\t\t");
		for (Map.Entry facetItem : facet) {
			writer.print("\t\t");
			writer.print(facetItem.getValue().count);
			writer.print("");
		}
		writer.print("");
	}

	private void renderFacets() throws Exception {
		FacetList facetList = result.getFacetList();
		if (facetList == null)
			return;
		writer.println("\t\t\t");
		for (Facet facet : facetList)
			renderFacet(facet);
		writer.println("");

	}

	// private void renderSpellCheck(SpellCheck spellCheck) throws Exception {
	// String fieldName = spellCheck.getFieldName();
	// writer.print("\t\t");
	// for (SpellCheckItem spellCheckItem : spellCheck) {
	// writer.print("\t\t\t");
	// for (SuggestionItem suggest : spellCheckItem.getSuggestions()) {
	// writer.print("\t\t\t\t");
	// writer.print("\t\t\t\t\t");
	// writer.print(StringEscapeUtils.escapeXml(suggest.getTerm()));
	// writer.println("");
	// writer.print("\t\t\t\t\t");
	// writer.print(suggest.getFreq());
	// writer.println("");
	// writer.println("");
	// }
	// writer.print("");
	// }
	// writer.print("\t\t");
	// }

	// private void renderSpellChecks() throws Exception {
	// List spellChecklist = result.getSpellCheckList();
	// if (spellChecklist == null)
	// return;
	// writer.println("\t\t\t");
	// for (SpellCheck spellCheck : spellChecklist)
	// renderSpellCheck(spellCheck);
	// writer.println("");
	// }

	public void render(PrintWriter writer) throws Exception {
		this.writer = writer;
		renderPrefix();
		renderDocuments();
		renderFacets();
		// renderSpellChecks();
		renderSuffix();

	}

	@Override
	public void render(ServletTransaction servletTransaction) throws Exception {
		servletTransaction.setResponseContentType("text/xml");
		if (outputEncoding != null && !outputEncoding.equals(""))
			render(servletTransaction.getWriter(outputEncoding));
		else
			render(servletTransaction.getWriter("UTF-8"));
	}
}