/*
 * Copyright (c) 2006-2015 DMDirc Developers
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.dmdirc.tests;

import com.google.common.jimfs.Configuration;
import com.google.common.jimfs.Jimfs;

import java.nio.file.FileSystem;
import java.nio.file.Path;

import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;

/**
 * JUnit rule to create a JimFS file system and automatically close it on completion.
 */
public class JimFsRule implements TestRule {

    private FileSystem fileSystem;

    @Override
    public Statement apply(final Statement base, final Description description) {
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                fileSystem = Jimfs.newFileSystem(Configuration.unix());
                try {
                    base.evaluate();
                } finally {
                    fileSystem.close();
                }
            }
        };
    }

    /**
     * Gets the file system for use in the test.
     *
     * @return The JimFS filesystem.
     */
    public FileSystem getFileSystem() {
        return fileSystem;
    }

    /**
     * Utility method to get a path from the file system.
     *
     * @param first The first component of the path
     * @param more Any additional path components
     * @return A corresponding {@link Path} object from the JimFS file system.
     */
    public Path getPath(final String first, final String ... more) {
        return fileSystem.getPath(first, more);
    }

}