80 lines
2.5 KiB
Java
80 lines
2.5 KiB
Java
//: com/mindviewinc/util/TextFile.java
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// ©2015 MindView LLC: see Copyright.txt
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// Static functions for reading and writing text files as
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// a single string, and treating a file as an ArrayList.
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package com.mindviewinc.util;
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import java.io.*;
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import java.util.*;
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public class TextFile extends ArrayList<String> {
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// Read a file as a single string:
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public static String read(String fileName) {
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StringBuilder sb = new StringBuilder();
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try {
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try(BufferedReader in =
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new BufferedReader(new FileReader(
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new File(fileName).getAbsoluteFile()))) {
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String s;
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while((s = in.readLine()) != null) {
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sb.append(s);
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sb.append("\n");
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}
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}
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} catch(IOException e) {
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throw new RuntimeException(e);
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}
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return sb.toString();
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}
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// Write a single file in one method call:
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public static void write(String fileName, String text) {
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try {
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try(PrintWriter out = new PrintWriter(
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new File(fileName).getAbsoluteFile())) {
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out.print(text);
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}
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} catch(IOException e) {
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throw new RuntimeException(e);
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}
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}
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// Read a file, split by any regular expression:
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public TextFile(String fileName, String splitter) {
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super(Arrays.asList(read(fileName).split(splitter)));
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// Regular expression split() often leaves an empty
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// String at the first position:
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if(get(0).equals("")) remove(0);
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}
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// Normally read by lines:
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public TextFile(String fileName) {
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this(fileName, "\n");
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}
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public void write(String fileName) {
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try {
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try(PrintWriter out = new PrintWriter(
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new File(fileName).getAbsoluteFile())) {
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for(String item : this)
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out.println(item);
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}
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} catch(IOException e) {
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throw new RuntimeException(e);
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}
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}
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// Simple test:
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public static void main(String[] args) {
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String file = read("TextFile.java");
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write("test.txt", file);
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TextFile text = new TextFile("test.txt");
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text.write("test2.txt");
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// Break into unique sorted list of words:
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TreeSet<String> words = new TreeSet<>(
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new TextFile("TextFile.java", "\\W+"));
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// Display the capitalized words:
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System.out.println(words.headSet("a"));
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}
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} /* Output:
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[0, ArrayList, Arrays, Break, BufferedReader,
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BufferedWriter, Clean, Display, File, FileReader,
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FileWriter, IOException, Normally, Output, PrintWriter,
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Read, Regular, RuntimeException, Simple, Static, String,
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StringBuilder, System, TextFile, Tools, TreeSet, W, Write]
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*///:~
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