searchaction.java

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package com.laoer.bbscs.bbs.action;

import org.apache.struts.action.*;
import javax.servlet.http.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import org.apache.lucene.analysis.*;
import org.apache.lucene.document.*;
import org.apache.lucene.index.*;
import org.apache.lucene.search.*;
import org.apache.lucene.queryParser.*;
import com.laoer.bbscs.lucene.*;
import com.laoer.bbscs.lucene.html.Entities;
import com.laoer.bbscs.bbs.actionform.*;
import com.laoer.bbscs.sysinfo.*;
import com.laoer.bbscs.servlet.*;

public class SearchAction
    extends Action {
  public ActionForward execute(ActionMapping actionMapping,
                               ActionForm actionForm,
                               HttpServletRequest httpServletRequest,
                               HttpServletResponse httpServletResponse) {

    SearchActionForm form = (SearchActionForm) actionForm;
    ActionErrors errors = new ActionErrors();
    UserSessionCheck myUserSessionCheck = new UserSessionCheck(form.getSid(),
        httpServletRequest);
    if (!myUserSessionCheck.checkSession()) {
      errors.add("error.timeout", new ActionError("error.timeout"));
      saveErrors(httpServletRequest, errors);
      return actionMapping.findForward("error");
    }
    if (myUserSessionCheck.isGuest()) {
      errors.add("noguest", new ActionError("error.user.noguest"));
      saveErrors(httpServletRequest, errors);
      return actionMapping.findForward("error");
    }
    httpServletRequest.setAttribute("myUserSessionCheck", myUserSessionCheck);
    httpServletRequest.setAttribute("sid", form.getSid());

    boolean error = false; //used to control flow for error messages
    String indexName = Sys.SYSINFO.FILEPATH + "index/"; //local copy of the configuration variable
    IndexSearcher searcher = null; //the searcher used to open/search the index
    Query query = null; //the Query created by the QueryParser
    Hits hits = null; //the search results
    int startindex = 0; //the first index displayed on this page
    int maxpage = 50; //the maximum items displayed on this page
    String queryString = null; //the query entered in the previous page
    String startVal = null; //string version of startindex
    String maxresults = null; //string version of maxpage
    int thispage = 0; //used for the for/next either maxpage or
    //hits.length() - startindex - whichever is
    //less
    try {
      searcher = new IndexSearcher(IndexReader.open(indexName));
    }
    catch (Exception e) {
      error = true; //don't do anything up to the footer
    }
    if (error == false) { //did we open the index?
      queryString = form.getQuery(); //get the search criteria
      startVal = form.getStartat(); //get the start index
      maxresults = form.getMaxresults(); //get max results per page

      try {
        maxpage = Integer.parseInt(maxresults); //parse the max results first
        startindex = Integer.parseInt(startVal); //then the start index
      }
      catch (Exception e) {}
      Analyzer analyzer = new StopAnalyzer(); //construct our usual analyzer
      try {
        query = QueryParser.parse(queryString, "contents", analyzer); //parse the
      }
      catch (ParseException e) { //query and construct the Query
        error = true; //don't bother with the rest of
      }
    }

    if (error == false && searcher != null) { // if we've had no errors
      // searcher != null was to handle
      // a weird compilation bug
      thispage = maxpage; // default last element to maxpage
      try {
        hits = searcher.search(query); // run the query
        if (hits.length() == 0) { // if we got no results tell the user

          error = true; // don't bother with the rest of the
          errors.add("error.search.noresult",
                     new ActionError("error.search.noresult"));
          saveErrors(httpServletRequest, errors);
          return actionMapping.findForward("error");
          // page
        }
      }
      catch (Exception e) {

      }
    }
    if (error == false && searcher != null) {
      httpServletRequest.setAttribute("startindex", String.valueOf(startindex));
      httpServletRequest.setAttribute("thispage", String.valueOf(thispage));
      httpServletRequest.setAttribute("hits", hits);
      httpServletRequest.setAttribute("queryString", queryString);
      return actionMapping.findForward("search");
    }
    else {
      errors.add("error.search.noresult",
                 new ActionError("error.search.noresult"));
      saveErrors(httpServletRequest, errors);

      return actionMapping.findForward("error");
    }
  }
}