Example usage for org.apache.lucene.index IndexReader totalTermFreq

Introduction

In this page you can find the example usage for org.apache.lucene.index IndexReader totalTermFreq.

Prototype

public abstract long totalTermFreq(Term term) throws IOException;

Source Link

Document

Returns the total number of occurrences of term across all documents (the sum of the freq() for each doc that has this term).

Usage

From source file:servlets.TermStatsComparator.java

/**
 * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
 * methods./*from w w w .  j  a v  a 2s .c  om*/
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    try (PrintWriter out = response.getWriter()) {
        /* TODO output your page here. You may use following sample code. */
        IndexReader reader = retriever.getReader();
        String term = request.getParameter("term");

        if (isNumber(term)) {
            TermStats[] termStats = null;
            try {
                termStats = HighFreqTerms.getHighFreqTerms(reader, Integer.parseInt(term),
                        TrecDocRetriever.FIELD_ANALYZED_CONTENT, new TermStatsComparator());
            } catch (Exception ex) {
                out.println("Error in obtaining term stats");
            }
            if (termStats == null)
                out.println("Error in obtaining term stats");

            StringBuffer responseBuff = new StringBuffer("<table><tbody>");
            responseBuff.append("<tr>").append("<th>").append("Term").append("</th>").append("<th>")
                    .append("Doc Freq").append("</th>").append("<th>").append("Coll Freq").append("</th>")
                    .append("</tr>");

            for (TermStats ts : termStats) {
                responseBuff.append("<tr>").append("<td>").append(ts.termtext.utf8ToString()).append("</td>")
                        .append("<td>").append(ts.docFreq).append("</td>").append("<td>")
                        .append(ts.totalTermFreq).append("</td>").append("</tr>");
            }
            responseBuff.append("</tbody></table>");
            out.println(responseBuff.toString());
        } else {
            String analyzedTerm = analyze(term);
            Term t = new Term(TrecDocRetriever.FIELD_ANALYZED_CONTENT, analyzedTerm);
            int docFreq = reader.docFreq(t);
            long collFreq = reader.totalTermFreq(t);
            out.println("Doc freq: " + docFreq + "&nbsp;&nbsp;" + "Coll Freq: " + collFreq);
        }
    }
}

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