de.intarsys.tools.file.Loader Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of isrt Show documentation
The basic runtime tools and interfaces for intarsys components.
There is a newer version: 4.11
/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.tools.file;

import java.io.File;
import java.io.IOException;

import de.intarsys.tools.string.StringTools;

/**
 * A utility class to simplify the task of loading files and / or directories.
 * 
 */
abstract public class Loader {
	public static final String PATH_SEPARATOR = "/"; //$NON-NLS-1$

	public static final String DEFAULT_LANGUAGE = "en"; //$NON-NLS-1$

	protected static final String PROP_USERLANGUAGE = "user.language"; //$NON-NLS-1$

	public Loader() {
	}

	abstract protected boolean basicLoadFile(File file, boolean readOnly,
			String path) throws IOException;

	public boolean load(File file, boolean readOnly, boolean recursive)
			throws IOException {
		if (file == null || !file.exists()) {
			return false;
		}
		return basicLoad(file, readOnly, recursive, StringTools.EMPTY);
	}

	protected boolean basicLoad(File file, boolean readOnly, boolean recursive,
			String path) throws IOException {
		if (file.isDirectory()) {
			return basicLoadDirectory(file, readOnly, recursive, path);
		} else {
			return basicLoadFile(file, readOnly, path);
		}
	}

	protected boolean basicLoadDirectory(File file, boolean readOnly, boolean recursive, String path) throws IOException {
		File[] files = file.listFiles();
		for (int i = 0; i < files.length; i++) {
			File childFile = files[i];
			if (recursive) {
				String newPath = path;
				if (childFile.isDirectory()) {
					newPath = path + childFile.getName() + PATH_SEPARATOR;
				}
				basicLoad(childFile, readOnly, recursive, newPath);
			} else {
				if (childFile.isFile()) {
					basicLoadFile(childFile, readOnly, path);
				}
			}
		}
		return true;
	}

	public boolean load(File parent, String filename, boolean readOnly,
			boolean recursive) throws IOException {
		if (filename == null) {
			return false;
		}
		File file = new File(filename);
		if (!file.isAbsolute()) {
			file = new File(parent, filename);
		}
		return load(file, readOnly, recursive);
	}

	public boolean loadNLS(File file, boolean readOnly, boolean recursive)
			throws IOException {
		if (file == null || !file.exists()) {
			return false;
		}
		if (file.isDirectory()) {
			String language = System.getProperty(PROP_USERLANGUAGE);
			File languageDir = new File(file, language);
			if (load(languageDir, readOnly, recursive)) {
				return true;
			}
			File defaultDir = new File(file, DEFAULT_LANGUAGE);
			return load(defaultDir, readOnly, recursive);
		} else {
			File parent = file.getParentFile();
			if (parent == null) {
				return false;
			}
			String basename = FileTools.getBaseName(file);
			String extension = FileTools.getExtension(file);
			String language = System.getProperty(PROP_USERLANGUAGE);
			File languageFile = new File(parent, basename + "_" + language //$NON-NLS-1$
					+ "." + extension); //$NON-NLS-1$
			if (file.exists()
					&& basicLoadFile(languageFile, readOnly, StringTools.EMPTY)) {
				return true;
			}
			return basicLoadFile(file, readOnly, StringTools.EMPTY);
		}
	}

	public boolean loadNLS(File parent, String filename, boolean readOnly,
			boolean recursive) throws IOException {
		if (filename == null) {
			return false;
		}
		File file = new File(filename);
		if (!file.isAbsolute()) {
			file = new File(parent, filename);
		}
		return loadNLS(file, readOnly, recursive);
	}

}