path: root/Master/Reference Architectures and Patterns/hjp5/examples/DirDB.java

/*
 * File........: c:/arc/prog/java/misc/dbtest/DirDB.java
 * Package.....: Default
 * Created.....: 98/10/02, Guido Krueger
 * RCS.........: $Revision$
 *               $Date$ $Author$
 *
 * Copyright (c) 1998 Guido Krueger. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for NON-COMMERCIAL purposes
 * and without fee is hereby granted provided that this
 * copyright notice appears in all copies.
 *
 * THE AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE
 * SUITABILITY OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
 * NON-INFRINGEMENT. THE AUTHOR SHALL NOT BE LIABLE FOR ANY
 * DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */
import java.util.*;
import java.io.*;
import java.sql.*;
import java.text.*;
import gk.util.*;

public class DirDB
{
  //---Constants-----------------------------------------------
  static int INSTANT185 = 1;
  static int ACCESS95   = 2;
  static int HSQLDB     = 3;

  //---Pseudo constants----------------------------------------
  static String FILESEP = System.getProperty("file.separator");

  //---Static Variables----------------------------------------
  static int              db = INSTANT185;
  static Connection       con;
  static Statement        stmt;
  static Statement        stmt1;
  static DatabaseMetaData dmd;
  static int              nextdid = 1;
  static int              nextfid = 1;

  /**
   * �ffnet die Datenbank.
   */
  public static void open()
  throws Exception
  {
    //Treiber laden und Connection erzeugen
    if (db == INSTANT185) {
      Class.forName("jdbc.idbDriver");
      con = DriverManager.getConnection(
        "jdbc:idb=dirdb.prp",
        new Properties()
      );
    } else if (db == HSQLDB) {
      Class.forName("org.hsqldb.jdbcDriver");
      con = DriverManager.getConnection(
        "jdbc:hsqldb:hsqldbtest",
        "SA",
        ""
      );
    } else {
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
      con = DriverManager.getConnection("jdbc:odbc:DirDB");
    }
    //Metadaten ausgeben
    dmd = con.getMetaData();
    System.out.println("");
    System.out.println("Connection URL: " + dmd.getURL());
    System.out.println("Driver Name:    " + dmd.getDriverName());
    System.out.println("Driver Version: " + dmd.getDriverVersion());
    System.out.println("");
    //Statementobjekte erzeugen
    stmt = con.createStatement();
    stmt1 = con.createStatement();
  }

  /**
   * Legt die Tabellen an.
   */
  public static void createTables()
  throws SQLException
  {
    //Anlegen der Tabelle dir
    try {
      stmt.executeUpdate("DROP TABLE dir");
    } catch (SQLException e) {
      //Nichts zu tun
    }
    stmt.executeUpdate("CREATE TABLE dir (" +
      "did       INT," +
      "dname     CHAR(100)," +
      "fatherdid INT," +
      "entries   INT)"
    );
    stmt.executeUpdate("CREATE INDEX idir1 ON dir ( did )");
    stmt.executeUpdate("CREATE INDEX idir2 ON dir ( fatherdid )");
    //Anlegen der Tabelle file
    try {
      stmt.executeUpdate("DROP TABLE file");
    } catch (SQLException e) {
      //Nichts zu tun
    }
    stmt.executeUpdate("CREATE TABLE file (" +
      "fid       INT ," +
      "did       INT," +
      "fname     CHAR(100)," +
      "fsize     INT," +
      "fdate     DATE," +
      "ftime     CHAR(5))"
    );
    stmt.executeUpdate("CREATE INDEX ifile1 ON file ( fid )");
  }

  /**
   * Durchl�uft den Verzeichnisbaum rekursiv und schreibt
   * Verzeichnis- und Dateinamen in die Datenbank.
   */
  public static void populate(String dir)
  throws Exception
  {
    addDirectory(0, "", dir);
  }

  /**
   * F�gt das angegebene Verzeichnis und alle
   * Unterverzeichnisse mit allen darin enthaltenen
   * Dateien zur Datenbank hinzu.
   */
  public static void addDirectory(
    int fatherdid, String parent, String name
  )
  throws Exception
  {
    String dirname = "";
    if (parent.length() > 0) {
      dirname = parent;
      if (!parent.endsWith(FILESEP)) {
        dirname += FILESEP;
      }
    }
    dirname += name;
    System.out.println("processing " + dirname);
    File dir = new File(dirname);
    if (!dir.isDirectory()) {
      throw new Exception("not a directory: " + dirname);
    }
    //Verzeichnis anlegen
    int did = nextdid++;
    stmt.executeUpdate(
      "INSERT INTO dir VALUES (" +
      did + "," +
      "\'" + name + "\'," +
      fatherdid + "," +
      "0)"
    );
    //Verzeichniseintr�ge lesen
    File entries[] = dir.listFiles();
    //Verzeichnis durchlaufen
    for (int i = 0; i < entries.length; ++i) {
      if (entries[i].isDirectory()) {
        addDirectory(did, dirname, entries[i].getName());
      } else {
        java.util.Date d = new java.util.Date(
          entries[i].lastModified()
        );
        SimpleDateFormat sdf;
        //Datum
        sdf = new SimpleDateFormat("yyyy-MM-dd");
        String date = sdf.format(d);
        //Zeit
        sdf = new SimpleDateFormat("HH:mm");
        String time = sdf.format(d);
        //Satz anh�ngen
        stmt.executeUpdate(
          "INSERT INTO file VALUES (" +
          (nextfid++) + "," +
          did + "," +
          "\'" + entries[i].getName() + "\'," +
          entries[i].length() + "," +
          "{d \'" + date + "\'}," +
          "\'" + time + "\')"
        );
        System.out.println("  " + entries[i].getName());
      }
    }
    //Anzahl der Eintr�ge aktualisieren
    stmt.executeUpdate(
      "UPDATE dir SET entries = " + entries.length +
      "  WHERE did = " + did
    );
  }

  /**
   * Gibt die Anzahl der Dateien und Verzeichnisse aus.
   */
  public static void countRecords()
  throws SQLException
  {
    ResultSet rs = stmt.executeQuery(
      "SELECT count(*) FROM dir"
    );
    if (!rs.next()) {
      throw new SQLException("SELECT COUNT(*): no result");
    }
    System.out.println("Directories: " + rs.getInt(1));
    rs = stmt.executeQuery("SELECT count(*) FROM file");
    if (!rs.next()) {
      throw new SQLException("SELECT COUNT(*): no result");
    }
    System.out.println("Files: " + rs.getInt(1));
    rs.close();
  }

  /**
   * Liefert den Pfadnamen zu dem Verzeichnis mit dem
   * angegebenen Schl�ssel.
   */
  public static String getDirPath(int did)
  throws SQLException
  {
    String ret = "";
    while (true) {
      ResultSet rs = stmt1.executeQuery(
        "SELECT * FROM dir WHERE did = " + did
      );
      if (!rs.next()) {
        throw new SQLException(
          "no dir record found with did = " + did
        );
      }
      ret = rs.getString("dname").trim() +
            (ret.length() > 0 ? FILESEP + ret : "");
      if ((did = rs.getInt("fatherdid")) == 0) {
        break;
      }
    }
    return ret;
  }

  /**
   * Gibt eine Liste aller Files auf dem Bildschirm aus,
   * die zu dem angegebenen Dateinamen passen. Darin d�rfen
   * die �blichen SQL-Wildcards % und _ enthalten sein.
   */
  public static void findFile(String name)
  throws SQLException
  {
    String query = "SELECT * FROM file " +
                   "WHERE fname LIKE \'" + name + "\'";
    if (db == INSTANT185) {
      query += " IGNORE CASE";
    }
    ResultSet rs = stmt.executeQuery(query);
    while (rs.next()) {
      String path = getDirPath(rs.getInt("did"));
      System.out.println(
        path + FILESEP +
        rs.getString("fname").trim()
      );
    }
    rs.close();
  }

  /**
   * Gibt eine Liste aller Verzeichnisse auf dem Bildschirm
   * aus, die zu dem angegebenen Verzeichnisnamen passen.
   * Darin d�rfen die �blichen SQL-Wildcards % und _
   * enthalten sein.
   */
  public static void findDir(String name)
  throws SQLException
  {
    String query = "SELECT * FROM dir " +
                   "WHERE dname LIKE \'" + name + "\'";
    if (db == INSTANT185) {
      query += " IGNORE CASE";
    }
    ResultSet rs = stmt.executeQuery(query);
    while (rs.next()) {
      System.out.println(
        getDirPath(rs.getInt("did")) +
        " (" + rs.getInt("entries") + " entries)"
      );
    }
    rs.close();
  }

  /**
   * Gibt die howmany gr��ten Dateien aus.
   */
  public static void biggestFiles(int howmany)
  throws SQLException
  {
    ResultSet rs = stmt.executeQuery(
      "SELECT * FROM file ORDER BY fsize DESC"
    );
    for (int i = 0; i < howmany; ++i) {
      if (rs.next()) {
        System.out.print(
          getDirPath(rs.getInt("did")) +
          FILESEP + rs.getString("fname").trim()
        );
        System.out.println(
          Str.getFormatted("%10d", rs.getInt("fsize"))
        );
      }
    }
    rs.close();
  }

  /**
   * Summiert einerseits die tats�chliche Gr��e aller
   * Dateien und andererseits die Gr��e, die sie durch
   * das Clustering mit der angegebenen Clustergr��e
   * belegen. Zus�tzlich wird der durch das Clustering
   * "verschwendete" Speicherplatz ausgegeben.
   */
  public static void clustering(int clustersize)
  throws SQLException
  {
    int truesize = 0;
    int clusteredsize = 0;
    double wasted;
    ResultSet rs = stmt.executeQuery(
      "SELECT * FROM file"
    );
    while (rs.next()) {
      int fsize = rs.getInt("fsize");
      truesize += fsize;
      if (fsize % clustersize == 0) {
        clusteredsize += fsize;
      } else {
        clusteredsize += ((fsize / clustersize) + 1) * clustersize;
      }
    }
    System.out.println("true size      = " + truesize);
    System.out.println("clustered size = " + clusteredsize);
    wasted = 100 * (1 - ((double)truesize / clusteredsize));
    System.out.println("wasted space   = " + wasted + " %");
  }

  /**
   * Schlie�t die Datenbank.
   */
  public static void close()
  throws SQLException
  {
    stmt.close();
    stmt1.close();
    con.close();
  }

  //---main-------------------------------------------------
  public static void main(String args[])
  {
    if (args.length < 1) {
      System.out.println("usage: java DirDB [A|I|H] <command> [<options>]");
      System.out.println("");
      System.out.println("command      options");
      System.out.println("-----------------------------------------");
      System.out.println("POPULATE     <directory>");
      System.out.println("COUNT");
      System.out.println("FINDFILE     <name>");
      System.out.println("FINDDIR      <name>");
      System.out.println("BIGGESTFILES <howmany>");
      System.out.println("CLUSTERING   <clustersize>");
      System.exit(1);
    }
    if (args[0].equalsIgnoreCase("A")) {
      db = ACCESS95;
    } else if (args[0].equalsIgnoreCase("H")) {
      db = HSQLDB;
    }
    try {
      if (args[1].equalsIgnoreCase("populate")) {
        open();
        createTables();
        populate(args[2]);
        close();
      } else if (args[1].equalsIgnoreCase("count")) {
        open();
        countRecords();
        close();
      } else if (args[1].equalsIgnoreCase("findfile")) {
        open();
        findFile(args[2]);
        close();
      } else if (args[1].equalsIgnoreCase("finddir")) {
        open();
        findDir(args[2]);
        close();
      } else if (args[1].equalsIgnoreCase("biggestfiles")) {
        open();
        biggestFiles(Integer.parseInt(args[2]));
        close();
      } else if (args[1].equalsIgnoreCase("clustering")) {
        open();
        clustering(Integer.parseInt(args[2]));
        close();
      }
    } catch (SQLException e) {
      while (e != null) {
        System.err.println(e.toString());
        System.err.println("SQL-State: " + e.getSQLState());
        System.err.println("ErrorCode: " + e.getErrorCode());
        e = e.getNextException();
      }
      System.exit(1);
    } catch (Exception e) {
      System.err.println(e.toString());
      System.exit(1);
    }
  }
}