update

java/wspp/Wspp.java

@@ -0,0 +1,80 @@
+package wspp;
+
+import java.io.*;
+import java.util.*;
+
+/**
+ * @author Nikita Doschennikov (me@fymio.us)
+ */
+public class Wspp {
+
+    public static void main(String[] args) {
+        if (args.length != 2) {
+            System.err.println(
+                "usage: java Wspp <inputFilePath> <outputFilePath>"
+            );
+        }
+
+        final String inputFileName = args[0];
+        final String outputFileName = args[1];
+
+        Map<String, WordInfo> words = new LinkedHashMap<>();
+
+        try (
+            BufferedReader br = new BufferedReader(
+                new FileReader(inputFileName)
+            );
+            FileWriter fw = new FileWriter(outputFileName)
+        ) {
+            String line;
+            int wordPos = 1;
+            while ((line = br.readLine()) != null) {
+                line = line.toLowerCase();
+                StringBuilder word = new StringBuilder();
+
+                for (char c : line.toCharArray()) {
+                    if (
+                        Character.isLetter(c) ||
+                        c == '\'' ||
+                        Character.getType(c) == Character.DASH_PUNCTUATION
+                    ) {
+                        word.append(c);
+                    } else {
+                        if (!word.isEmpty()) {
+                            if (words.containsKey(word.toString())) {
+                                words
+                                    .get(word.toString())
+                                    .occurrences.put(wordPos++);
+                            } else {
+                                WordInfo info = new WordInfo(word.toString());
+                                info.occurrences.put(wordPos++);
+                                words.put(word.toString(), info);
+                            }
+                        }
+
+                        word = new StringBuilder();
+                    }
+                }
+
+                if (!word.isEmpty()) {
+                    if (words.containsKey(word.toString())) {
+                        words.get(word.toString()).occurrences.put(wordPos++);
+                    } else {
+                        WordInfo info = new WordInfo(word.toString());
+                        info.occurrences.put(wordPos++);
+                        words.put(word.toString(), info);
+                    }
+                }
+            }
+
+            for (String word : words.keySet()) {
+                WordInfo info = words.get(word);
+                int count = info.occurrences.getLength();
+                String occurencies = info.occurrences.toString();
+                fw.write(word + " " + count + " " + occurencies);
+            }
+        } catch (IOException e) {
+            System.out.println("Error reading file.");
+        }
+    }
+}