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/* Copyright 2013 Benjamin Linskey
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.benlinskey.grdbc;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
/**
* Reads in an XML file containing a Greek lexicon and stores entries in an
* SQLite database.
* @author Ben Linskey
*/
public class LexiconCreator {
private final static String FILE = "../xml/Perseus_text_1999.04.0058.xml";
private final static String DB = "lexicon.db";
private final static String TABLE_NAME = "lexicon";
private Connection connection;
private PreparedStatement insertStatement;
/**
* Class constructor.
*/
public LexiconCreator() {
// Load driver.
try {
Class.forName("org.sqlite.JDBC");
} catch (ClassNotFoundException e) {
e.printStackTrace();
System.exit(1);
}
// Connect to database.
try {
connection = DriverManager.getConnection("jdbc:sqlite:" + DB);
} catch (SQLException e) {
e.printStackTrace();
System.exit(1);
}
// Use batch inserts for speed.
try {
connection.setAutoCommit(false);
} catch (SQLException e) {
e.printStackTrace();
System.exit(1);
}
createDatabase();
// Create a prepared statement to use when inserting entries.
try {
insertStatement = connection.prepareStatement("INSERT INTO "
+ TABLE_NAME + " VALUES (NULL, ?, ?, ?, ?, ?, ?)");
} catch (SQLException e) {
e.printStackTrace();
System.exit(1);
}
}
/**
* Creates the lexicon database.
*/
public void run() {
addEntries();
createIndex();
try {
insertStatement.close();
connection.close();
} catch (SQLException e) {
e.printStackTrace();
System.exit(1);
}
System.out.println("Done.");
}
/**
* Resets the database if it already exists and creates a new, empty
* database.
*/
private void createDatabase() {
System.out.println("Creating lexicon database...");
try {
String dropTable = "DROP TABLE IF EXISTS " + TABLE_NAME;
String createTable = "CREATE TABLE " + TABLE_NAME + " (" +
"_ID INT PRIMARY KEY, " +
"betaNoSymbols VARCHAR(100), " +
"betaSymbols VARCHAR(100), " +
"greekFullWord VARCHAR(100), " +
"greekNoSymbols VARCHAR(100), " +
"greekLowercase VARCHAR(100), " +
"entry TEXT)";
Statement statement = connection.createStatement();
statement.executeUpdate(dropTable);
statement.executeUpdate(createTable);
connection.commit();
statement.close();
} catch (SQLException e) {
e.printStackTrace();
System.exit(1);
}
}
/**
* Parses the XML file, modifies the lexicon entries, and inserts the
* modified entries into the database.
*/
private void addEntries() {
System.out.println("Inserting entries...");
try {
BufferedReader in = new BufferedReader(new FileReader(FILE));
StringBuilder xml = new StringBuilder();
// Extract the XML for each lexicon entry, then process it.
while (in.ready()) {
String line = in.readLine();
if (line.startsWith("<entry ")) {
xml.delete(0, xml.length()); // Reset XML.
xml.append(line); // Add this line to new chunk of XML.
} else if (line.startsWith("</entry>")) {
xml.append(line);
processEntry(xml.toString());
} else {
xml.append(line);
}
}
in.close();
insertStatement.executeBatch();
connection.commit();
} catch (FileNotFoundException e) {
System.err.println("Error: Lexicon file not found.");
System.exit(1);
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
} catch (SQLException e) {
e.printStackTrace();
System.exit(1);
}
}
/**
* Modifies the specified entry and inserts it into the database.
* @param xml the XML containing the entry to process
*/
private void processEntry(String xml) {
try {
LexiconParser parser = new LexiconParser(xml);
insertStatement.setString(1, parser.getBetaNoSymbols());
insertStatement.setString(2, parser.getBetaSymbols());
insertStatement.setString(3, parser.getGreekFullWord());
insertStatement.setString(4, parser.getGreekNoSymbols());
insertStatement.setString(5, parser.getGreekLowercase());
insertStatement.setString(6, parser.getEntry());
insertStatement.addBatch();
} catch (ParserConfigurationException e) {
e.printStackTrace();
System.exit(1);
} catch (SAXException e) {
e.printStackTrace();
System.exit(1);
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
} catch (SQLException e) {
e.printStackTrace();
System.exit(1);
}
}
/**
* Creates an index on the database to speed up searches.
*/
private void createIndex() {
System.out.println("Creating index...");
// Create an index on the three columns matched against search queries.
String sql = "CREATE INDEX searchIndex ON " + TABLE_NAME +
" (betaNoSymbols, betaSymbols, greekNoSymbols)";
try {
Statement statement = connection.createStatement();
statement.executeUpdate(sql);
statement.close();
connection.commit();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
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