ArgumentParser.java

/*
 * Copyright (c) 2002 Cunningham & Cunningham, Inc.
 * Copyright (c) 2009-2015 by Jochen Wierum & Cologne Intelligence
 *
 * This file is part of FitGoodies.
 *
 * FitGoodies is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * FitGoodies is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with FitGoodies.  If not, see <http://www.gnu.org/licenses/>.
 */

package de.cologneintelligence.fitgoodies.runners;

import de.cologneintelligence.fitgoodies.file.FileInformation;
import de.cologneintelligence.fitgoodies.file.FileSystemDirectoryHelper;

import java.io.File;
import java.util.LinkedList;
import java.util.List;

public class ArgumentParser {
	private static final String DEFAULT_ENCODING = "utf-8";

	private final File pwd;
	private File destinationDir;
	private String encoding;
	private List<FileInformation> files = new LinkedList<>();
	private FileSystemDirectoryHelper fsHelper;
	private DirectoryFilter currentDirFilter;
	private File sourceDir;

	public ArgumentParser(File pwd, FileSystemDirectoryHelper fsHelper) {
		this.pwd = pwd;
		this.fsHelper = fsHelper;
	}

	public void parse(String[] args) {
		for (int i = 0; i < args.length; i += 2) {
			String arg = args[i];

			if (null != arg) switch (arg) {
				case "-d":
				case "--destination":
					this.destinationDir = new File(getOption(args, i, "-d", this.destinationDir));
					break;
				case "-e":
				case "--encoding":
					this.encoding = getOption(args, i, "-e", this.encoding);
					break;
				case "-f":
				case "--file":
					finishDir();
					addFile(getOption(args, i, "-f", null));
					break;
				case "-s":
				case "--source":
					finishDir();
					addDirectory(getOption(args, i, "s", sourceDir));
					break;
				case "-o":
				case "--only":
					if (currentDirFilter == null) {
						throw new IllegalArgumentException("Limit must follow -s or -o");
					}
					addLimit(getOption(args, i, "l", null));
					break;
				default:
					throw new IllegalArgumentException("Unknown argument: " + arg);
			}
		}

		if (encoding == null) {
			encoding = DEFAULT_ENCODING;
		}

		if (destinationDir == null) {
			throw new IllegalArgumentException("Option -d is required");
		}

		finishDir();
	}

	private void addLimit(String limit) {
		File absFile = fsHelper.rel2abs(sourceDir.getAbsolutePath(), limit);
		currentDirFilter.addLimit(absFile);
	}

	private void addFile(String file) {
		files.add(new FileInformation(new File(file).getAbsoluteFile()));
	}

	private void addDirectory(String file) {
		finishDir();
		sourceDir = fsHelper.rel2abs(pwd.getAbsolutePath(), file);
		currentDirFilter = new DirectoryFilter(sourceDir, fsHelper);
	}

	private void finishDir() {
		if (currentDirFilter != null) {
			for (FileInformation fileInformation : currentDirFilter.getSelectedFiles()) {
				files.add(fileInformation);
			}
			currentDirFilter = null;
		}
	}

	private String getOption(String[] args, int i, String option, Object oldValue) {
		if (i == args.length - 1) {
			throw new IllegalArgumentException("Option " + option + " is missing an argument!");
		}

		if (oldValue != null) {
			throw new IllegalArgumentException("Option " + option + " is set twice!");
		}

		return args[i + 1];
	}

	public File getDestinationDir() {
		return destinationDir;
	}

	public String getEncoding() {
		return encoding;
	}

	public List<FileInformation> getFiles() {
		return files;
	}

	public File getBaseDir() {
		return sourceDir;
	}
}