package mightypork.utils.files; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import java.util.Map.Entry; import mightypork.utils.logging.Log; /** * Utility for parsing simple config files
* # and // mark a comment
* empty lines and lines without "=" are ignored
* lines with "=" must have "key = value" format, or a warning is logged.
* use "NULL" to create empty value. * * @author MightyPork */ public class SimpleConfig { /** * Load list from file * * @param file file * @return map of keys and values * @throws IOException */ public static List listFromFile(File file) throws IOException { final String fileText = FileUtils.fileToString(file); return listFromString(fileText); } /** * Load map from file * * @param file file * @return map of keys and values * @throws IOException */ public static Map mapFromFile(File file) throws IOException { final String fileText = FileUtils.fileToString(file); return mapFromString(fileText); } /** * Load list from string * * @param text text of the file * @return map of keys and values */ public static List listFromString(String text) { final List list = new ArrayList(); final String[] groupsLines = text.split("\n"); for (String s : groupsLines) { // ignore invalid lines if (s.length() == 0) continue; if (s.startsWith("#") || s.startsWith("//")) continue; // NULL value if (s.equalsIgnoreCase("NULL")) s = null; if (s != null) s = s.replace("\\n", "\n"); // save extracted key-value pair list.add(s); } return list; } /** * Load map from string * * @param text text of the file * @return map of keys and values */ public static Map mapFromString(String text) { final LinkedHashMap pairs = new LinkedHashMap(); final String[] groupsLines = text.split("\n"); for (final String s : groupsLines) { // ignore invalid lines if (s.length() == 0) continue; if (s.startsWith("#") || s.startsWith("//")) continue; if (!s.contains("=")) continue; // split and trim String[] parts = s.split("="); for (int i = 0; i < parts.length; i++) { parts[i] = parts[i].trim(); } // check if both parts are valid if (parts.length == 0) { Log.w("Bad line in config file: " + s); continue; } if (parts.length == 1) { parts = new String[] { parts[0], "" }; } if (parts.length != 2) { Log.w("Bad line in config file: " + s); continue; } // NULL value if (parts[0].equalsIgnoreCase("NULL")) parts[0] = null; if (parts[1].equalsIgnoreCase("NULL")) parts[1] = null; if (parts[0] != null) parts[0] = parts[0].replace("\\n", "\n"); if (parts[1] != null) parts[1] = parts[1].replace("\\n", "\n"); // save extracted key-value pair pairs.put(parts[0], parts[1]); } return pairs; } /** * Save map to file * * @param target * @param data * @param allowNulls allow nulls. * @throws IOException */ public static void mapToFile(File target, Map data, boolean allowNulls) throws IOException { final List lines = new ArrayList(); for (final Entry e : data.entrySet()) { String key = e.getKey(); String value = e.getValue(); if (!allowNulls && (key == null || value == null || key.length() == 0 || value.length() == 0)) continue; if (key == null) key = "NULL"; if (value == null) value = "NULL"; key = key.replace("\n", "\\n"); value = value.replace("\n", "\\n"); lines.add(key + " = " + value); } String text = ""; // # File written by SimpleConfig for (final String s : lines) { if (text.length() > 0) text += "\n"; text += s; } FileUtils.stringToFile(target, text); } /** * Save list to file * * @param target * @param data * @throws IOException */ public static void listToFile(File target, List data) throws IOException { String text = ""; // # File written by SimpleConfig for (String s : data) { if (text.length() > 0) text += "\n"; if (s == null) s = "NULL"; s = s.replace("\n", "\\n"); text += s; } FileUtils.stringToFile(target, text); } }