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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License V2.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this GPL v2 license.
 *
 * The generated images can then be used without any reference to the GPL v2 license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml;

import java.io.IOException;

import net.sourceforge.plantuml.security.SFile;
import net.sourceforge.plantuml.security.SecurityUtils;
import net.sourceforge.plantuml.utils.Log;

public class FileSystem {
	// ::remove file when __HAXE__

	private final static FileSystem singleton = new FileSystem();

	private ThreadLocal currentDir = new ThreadLocal<>();

	private FileSystem() {
		reset();
	}

	public static FileSystem getInstance() {
		return singleton;
	}

	public void setCurrentDir(SFile dir) {
		if (dir == null) {
			this.currentDir.set(null);
		} else {
			Log.info("Setting current dir: " + dir.getAbsolutePath());
			this.currentDir.set(dir.getAbsolutePath());
		}
	}

	public SFile getCurrentDir() {
		// ::comment when __CORE__
		final String path = this.currentDir.get();
		if (path != null)
			return new SFile(path);

		return null;
	}

	public SFile getFile(String nameOrPath) throws IOException {
		// ::uncomment when __CORE__
		// return null;

		// ::comment when __CORE__
		if (isAbsolute(nameOrPath)) {
			final SFile result = new SFile(nameOrPath);
			Log.info("Trying " + result.getAbsolutePath());
			return result.getCanonicalFile();
		}

		final SFile dir = getCurrentDir();
		SFile filecurrent = null;
		if (dir != null) {
			filecurrent = dir.getAbsoluteFile().file(nameOrPath);
			Log.info("Current dir is " + dir.getAbsolutePath() + " so trying " + filecurrent.getAbsolutePath());
			if (filecurrent.exists())
				return filecurrent.getCanonicalFile();

		}
		for (SFile d : SecurityUtils.getPath(SecurityUtils.PATHS_INCLUDES)) {
			assert d.isDirectory();
			final SFile file = d.file(nameOrPath);
			if (file.exists())
				return file.getCanonicalFile();
		}
		for (SFile d : SecurityUtils.getPath(SecurityUtils.PATHS_CLASSES)) {
			assert d.isDirectory();
			final SFile file = d.file(nameOrPath);
			if (file.exists())
				return file.getCanonicalFile();

		}
		if (dir == null) {
			assert filecurrent == null;
			return new SFile(nameOrPath).getCanonicalFile();
		}
		assert filecurrent != null;
		return filecurrent;
	}

	// ::comment when __CORE__
	private boolean isAbsolute(String nameOrPath) {
		final SFile f = new SFile(nameOrPath);
		return f.isAbsolute();
	}

	public void reset() {
		setCurrentDir(new SFile("."));
	}

}