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/**
*
*/
package de.fhswf.in.inf.java1.aufgabe9;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Collections;
import java.util.Map.Entry;
import java.util.Set;
import java.util.TreeMap;
/**
* A class, that counts words in files.
*
* @author $Author: $
* @version $Revision: $, $Date: $ UTC
*/
public class WordCount
{
private TreeMap<String, Integer> wordMap = new TreeMap<>();
/**
* Empty constructor.
*
*/
public WordCount()
{
}
/**
* Reads a file and counts the words.
*
* @param file
* The file to be read.
*/
public final void readFile(File file)
{
try (BufferedReader f = new BufferedReader(new FileReader(file)))
{
wordMap.clear();
String line = null;
while ((line = f.readLine()) != null)
{
String[] lineArray = line
.split("[^\\p{IsAlphabetic}\\p{Digit}]+");
for (String word : lineArray)
{
// Split creates empty String, if first char is a split char.
if (!word.isEmpty())
{
word = word.toLowerCase();
Integer tmp = wordMap.get(word);
if (tmp != null)
{
wordMap.put(word, tmp + 1);
}
else
{
wordMap.put(word, new Integer(1));
}
}
}
}
}
catch (IOException e)
{
e.printStackTrace(System.err);
}
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public final String toString()
{
StringBuilder ret = new StringBuilder();
for (Entry<String, Integer> mapping : wordMap.entrySet())
{
ret.append(mapping.getKey() + " = " + mapping.getValue() + "\n");
}
return ret.toString();
}
/**
* Returns all words from the file.
*
* @return An unmodifiable Set of the words from the file.
*/
public final Set<String> getWords()
{
return Collections.unmodifiableSet(wordMap.keySet());
}
/**
* Returns the count of a word in a file.
*
* @param word
* The file to be counted.
* @return Returns the count of findings in the file.
*/
public final int getCount(String word)
{
if (word == null)
{
throw new IllegalArgumentException("Word must be a valid referece.");
}
if (word.isEmpty())
{
throw new IllegalArgumentException("The word can't be empty.");
}
Integer tmp = wordMap.get(word);
if (tmp == null)
{
return 0;
}
return tmp;
}
}
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