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/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package main;
import database.ConnectionBuilder;
import database.NamedPreparedStatement;
import database.QueryUtils;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Scanner;
/**
* The sentiment analysis class that rates tweets based on a unigram and
* bigram set of weights.
*/
public class Analyzor {
/**
* The map that matches single words to their weights.
*/
private final HashMap<String, Double> unimap = new HashMap();
/**
* The map that matches word pairs to their weights.
*/
private final HashMap<String, Double> bimap = new HashMap();
/**
* The results of the query (can be null)
*/
private ResultSet data = null;
/**
* The connection to the database.
*/
private Connection connection;
/**
* The connection builder to initialize the connection.
*/
private ConnectionBuilder builder;
public Analyzor(ConnectionBuilder builder) {
this.builder = builder;
}
//reads the lexicons
private void readLexicon() throws FileNotFoundException {
//TODO: fix? hardcoded filenames.
Scanner uniScanner = new Scanner(new File("unigrams-pmilexicon.txt"));
Scanner biScanner = new Scanner(new File("bigrams-pmilexicon.txt"));
//Fill the map of unigrams
while (uniScanner.hasNext()) {
unimap.put(uniScanner.next(), Double.parseDouble(uniScanner.next()));
if (uniScanner.hasNextLine()) {
uniScanner.nextLine();
}
// NumberFormatException is not handled.
}
//fill the map of bigrams
while (biScanner.hasNext()) {
bimap.put(biScanner.next() + " " + biScanner.next(), Double.parseDouble(biScanner.next()));
if (biScanner.hasNextLine()) {
biScanner.nextLine();
}
// NumberFormatException is not handled.
}
}
/**
* Executes a query that the analyzer can analyze.
*
* @param query The query string to execute.
* @throws SQLException When database connection isn't available.
*/
void Query(String query) throws SQLException {
PreparedStatement statement;
//make a connection to the database and execute the query
connection = builder.create();
statement = connection.prepareStatement(query);
data = statement.executeQuery();
}
/**
* Run a sentiment analysis and fill the database with the output.
*
* @throws SQLException
* @throws IOException
*/
public void sentimentAnalysis() throws SQLException, IOException {
//read the lexicons
readLexicon();
//go to the start of te dataset
if (data == null) {
System.err.println("data is empty, try querying first");
return;
}
data.beforeFirst();
Double value;
String text;
//for all tuples
while (data.next()) {
//get the text
text = data.getString("text");
text = replacePunct(text);
// test is the tweet text you are going to analyze
String[] words = text.split("\\s+"); // text splitted into separate words
double positiverate = 0; // positive rating
// Rate the text with unigrams
for (String word : words) {
value = unimap.get(word);
if (value != null) {
positiverate += unimap.get(word);
}
}
// Rate the text with bigrams
for (int i = 0; i < words.length - 1; i++) {
String pair = words[i] + " " + words[i + 1];
value = bimap.get(pair);
if (value != null) {
positiverate += bimap.get(pair);
}
}
//insert the rating into the database
NamedPreparedStatement m_insertRating;
m_insertRating = new NamedPreparedStatement(connection, QueryUtils.insertRating);
QueryUtils.setInsertParams(m_insertRating, data.getLong("tweetid"), data.getString("brand"), (int) (positiverate * 10));
m_insertRating.executeUpdate();
//don't print the rate
//System.out.println(text + ": " + (int) (positiverate * 10));
}
}
//makes a wordcloud of the tweets in the ResultSet data
private void makeWordCloud() throws SQLException {
//go to the start of the ResultSet data
if (data == null) {
System.err.println("data is empty, try querying first");
return;
}
//make the hashmap with the words and their frequency
HashMap<String, Integer> wordcloud = new HashMap<>();
//set the pointer at the start of the ResultSet
data.beforeFirst();
while(data.next()){
//get the text
}
}
//replaces punctuation so it will be splitted
private String replacePunct(String text) {
text = text.replaceAll("https?://\\S*", "");
text = text.replaceAll("[!?):;\"']", " $0");
text = text.replaceAll("[.,-](\\s|$)", " $0");
text = text.replaceAll("\\s[(\"']", "$0 ");
return text;
}
}
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