source: trunk/mgpp/java/org/greenstone/mgpp/Queryer.java@ 3365

package org.greenstone.mgpp;

import java.util.Vector;
import java.io.BufferedReader;
import java.io.InputStreamReader;

/** Queryer - java port of c++ Queryer 
 * - uses MGPPWrapper to access mgpp
 * only has get document and search - full text browse not implemented
 *
 * run as:
 * java org.greenstone.mgpp.Queryer <basedir> <indexdir> <textdir>
 *@see MGPPWrapper
 */
public class Queryer {
  
  /** outputs to std out a help message describing the commands used by 
   * Queryer 
   */
  public void printHelp() {
    
    System.out.println( "commands available are:\n"+
                "\t.q\t\tquit\n"+
                "\t.h\t\tprint this help message\n"+
                "\t.d\t\tprint the current query parameter settings\n" +
                "\t.i<level>\tchange the search level to level\n"+
                "\t.l<level>\tchange the result level to level\n"+
                "\t.r0/.r1\t\tranking off/on\n"+
                "\t.t0/.t1\t\tquery type some/all\n"+
                "\t.c0/.c1\t\tcasefolding off/on\n"+
                "\t.s0/.s1\t\tstemming off/on\n"+
                "\t.o0/.o1\t\tshort output off/on\n"+
                "\t.m<num>\t\tset max docs to return to num\n\n"+
                "\t.p<docnum>\tprint document docnum\n"+
                "\t<query string>\t do a query\n");
    }

   
    public static void main(String[] args) {
    if (args.length != 3) {
        System.out.println("Usage: java org.greenstone.mgpp.Queryer <basedir> <indexdir> <textdir>");
        return;
    }
    
    Queryer self = new Queryer();
    
    String base_dir = args[0];
    String text_path = args[2];
    String index_path = args[1];

    // the jni class to access mgpp stuff
    MGPPWrapper wrapper = new MGPPWrapper();
    wrapper.loadIndexData(base_dir, index_path);
    
    // the return level
    String level = "Section";

    System.out.println("Welcome to Java Queryer :-)");
    self.printHelp();

    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    boolean shortOutput=false;

    String command; // user input
    char x; // the command letter
    String data=null; // any auxiliary input to a command
    while (true) {
      System.out.print(">"); // the prompt
            try {
                command = br.readLine();
                command=command.trim();
        if (command.startsWith(".")) {
            // a system command
            x = command.charAt(1);
            if (command.length() > 2) {
            data = command.substring(2);
            data = data.trim();
            
            }
            switch (x) {
            case 'q': // clean up and exit
            wrapper.unloadIndexData();
            return;  
            case 'h': // print help message
            self.printHelp();
            break;
            case 'd': // print query param settings
            String info = wrapper.getQueryParams();
            System.out.println(info);
            break;
            case 'p': // print doc
            int docnum = Integer.parseInt(data);
            String doc = wrapper.getDocument(base_dir, text_path, 
                             level, docnum);
            System.out.println(doc);
            break;
            case 'm': //match docs
            int match = Integer.parseInt(data);
            wrapper.setMaxDocs(match);
            break;
            case 's': // set stem on/off
            int stem = Integer.parseInt(data);
            if (stem==0 ){
                wrapper.setStem(false);
            } else if(stem==1) {
                wrapper.setStem(true);
            } else {
                System.err.println("Error: stem should be 0 or 1");
            }
            break;
            case 'c': // set case on/off
            int casef = Integer.parseInt(data);
            if (casef==0) {
                wrapper.setCase(false);
            } else if (casef==1) {
                wrapper.setCase(true);
            } else {
                System.err.println("Error: case should be 0 or 1");
            }
            break;
            case 'i': // set search level
            wrapper.setQueryLevel(data);
            break;
            case 'l': // set result level
            wrapper.setReturnLevel(data);
            break; 
            case 'r': // set rank on/off
            int rank = Integer.parseInt(data);
            if (rank==0) {
                wrapper.setSortByRank(false);
            } else if (rank==1) {
                wrapper.setSortByRank(true);
            } else {
                System.err.println("Error: rank should be 0 or 1");
            }
            break;
            case 't': // set query type some/all
            int type = Integer.parseInt(data);
            if (type==0 || type==1) {
                wrapper.setMatchMode(type);
            } else {
                System.err.println("Error: type should be 0 (some) or 1 (all)");
            }
            break;
            case 'o': // set output short/long
            int output = Integer.parseInt(data);
            if (output==0) {
                shortOutput = false;
            } else if (output==1) {
                shortOutput = true;
            }else {
                System.err.println("Error: output should be 0 or 1");
            }
            break;
            }
        }
        else {
            // a query
            wrapper.runQuery(command);
            MGPPQueryResult res = wrapper.getQueryResult();
            if (shortOutput) {
              System.out.println(res.toShortString());
            } else {
              System.out.println(res.toString());
            }
        }
            
        } catch (Exception e) {
        System.out.println("Queryer error: "+e.getClass() + " "+e.getMessage());
        }

    }
    }


}