1.1 --- a/java/copy-image-resizer/src/cz/frantovo/copyImageResizer/CLIParser.java Sun Nov 16 21:57:03 2014 +0100
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,139 +0,0 @@
1.4 -/**
1.5 - * copy-image-resizer
1.6 - * Copyright © 2014 František Kučera (frantovo.cz)
1.7 - *
1.8 - * This program is free software: you can redistribute it and/or modify
1.9 - * it under the terms of the GNU General Public License as published by
1.10 - * the Free Software Foundation, either version 3 of the License, or
1.11 - * (at your option) any later version.
1.12 - *
1.13 - * This program is distributed in the hope that it will be useful,
1.14 - * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.15 - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.16 - * GNU General Public License for more details.
1.17 - *
1.18 - * You should have received a copy of the GNU General Public License
1.19 - * along with this program. If not, see <http://www.gnu.org/licenses/>.
1.20 - */
1.21 -package cz.frantovo.copyImageResizer;
1.22 -
1.23 -import java.io.File;
1.24 -import java.util.Arrays;
1.25 -import java.util.Collection;
1.26 -
1.27 -/**
1.28 - *
1.29 - * @author Ing. František Kučera (frantovo.cz)
1.30 - */
1.31 -public class CLIParser {
1.32 -
1.33 - public CLIOptions parseOptions(String[] args) throws CLIParserException {
1.34 - CLIOptions options = new CLIOptions();
1.35 -
1.36 - for (int i = 0; i < args.length; i++) {
1.37 - String arg = args[i];
1.38 -
1.39 - boolean matches = false;
1.40 -
1.41 - for (Token t : Token.values()) {
1.42 - if (t.matches(arg)) {
1.43 - int parsedArgs = t.parse(args, i, options);
1.44 - i = i + parsedArgs;
1.45 - matches = true;
1.46 - }
1.47 - }
1.48 -
1.49 - if (!matches) {
1.50 - throw new CLIParserException("Unknown option: " + arg);
1.51 - }
1.52 - }
1.53 -
1.54 - return options;
1.55 - }
1.56 -
1.57 - private static String fetchNext(String[] args, int index) throws CLIParserException {
1.58 - if (index < args.length) {
1.59 - return args[index];
1.60 - } else {
1.61 - throw new CLIParserException("Expecting value for option: " + args[index - 1]);
1.62 - }
1.63 - }
1.64 -
1.65 - private static enum Token {
1.66 -
1.67 - INPUT_DIR("--input-dir") { // bash-completion: option
1.68 - @Override
1.69 - public int parse(String[] args, int index, CLIOptions options) throws CLIParserException {
1.70 - int originalIndex = index;
1.71 - String name = fetchNext(args, ++index);
1.72 - options.setInput(new File(name));
1.73 - return index - originalIndex;
1.74 - }
1.75 - },
1.76 - OUTPUT_DIR("--output-dir") { // bash-completion: option
1.77 - @Override
1.78 - public int parse(String[] args, int index, CLIOptions options) throws CLIParserException {
1.79 - int originalIndex = index;
1.80 - String name = fetchNext(args, ++index);
1.81 - options.setOutput(new File(name));
1.82 - return index - originalIndex;
1.83 - }
1.84 - },
1.85 - SIZE("--size") { // bash-completion: option
1.86 - @Override
1.87 - public int parse(String[] args, int index, CLIOptions options) throws CLIParserException {
1.88 - int originalIndex = index;
1.89 - int width = parseInt(fetchNext(args, ++index));
1.90 - int height = parseInt(fetchNext(args, ++index));
1.91 - String directory = width + "x" + height;
1.92 - options.addSize(new CLIOptions.SizeSpecification(width, height, directory));
1.93 - return index - originalIndex;
1.94 - }
1.95 - },
1.96 - SIZE_NAMED("--size-named") { // bash-completion: option
1.97 - @Override
1.98 - public int parse(String[] args, int index, CLIOptions options) throws CLIParserException {
1.99 - int originalIndex = index;
1.100 - int width = parseInt(fetchNext(args, ++index));
1.101 - int height = parseInt(fetchNext(args, ++index));
1.102 - String directory = fetchNext(args, ++index);
1.103 - options.addSize(new CLIOptions.SizeSpecification(width, height, directory));
1.104 - return index - originalIndex;
1.105 - }
1.106 - };
1.107 -
1.108 - private final Collection<String> options;
1.109 -
1.110 - private Token(String... options) {
1.111 - this.options = Arrays.asList(options);
1.112 - }
1.113 -
1.114 - /**
1.115 - * @param option e.g. „--input-file“
1.116 - * @return whether option is this token
1.117 - */
1.118 - public boolean matches(String option) {
1.119 - return options.contains(option);
1.120 - }
1.121 -
1.122 - private static int parseInt(String number) throws CLIParserException {
1.123 - try {
1.124 - return Integer.parseInt(number);
1.125 - } catch (Exception e) {
1.126 - throw new CLIParserException("Unable to parse integer: " + number, e);
1.127 - }
1.128 - }
1.129 -
1.130 - /**
1.131 - * Parse String arguments and fill values into the options object.
1.132 - *
1.133 - * @param args CLI arguments
1.134 - * @param index index of the option matched by this token, like „--input-file“
1.135 - * @param options object to be filled
1.136 - * @return number of parsed arguments – if option has no arguments (just boolean flag),
1.137 - * return 0, otherwise return positive integer: number of eaten arguments.
1.138 - * @throws CLIParserException
1.139 - */
1.140 - public abstract int parse(String[] args, int index, CLIOptions options) throws CLIParserException;
1.141 - }
1.142 -}