io.jsync.file.impl.ClasspathPathResolver Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jsync.io Show documentation

jsync.io is a non-blocking, event-driven networking framework for Java

There is a newer version: 1.10.13

/*
 * Copyright (c) 2011-2013 The original author or authors
 * ------------------------------------------------------
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution.
 *
 *     The Eclipse Public License is available at
 *     http://www.eclipse.org/legal/epl-v10.html
 *
 *     The Apache License v2.0 is available at
 *     http://www.opensource.org/licenses/apache2.0.php
 *
 * You may elect to redistribute this code under either of these licenses.
 */

package io.jsync.file.impl;

import io.jsync.AsyncException;

import java.net.URI;
import java.net.URL;
import java.net.URLDecoder;
import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * This resolver resolves a file by trying to load it from the classpath of the context class loader.
 * This is used when running modules by specifying a classpath as opposed to from the file system.
 * In this case, the modules might access files on disk, e.g. attempt to serve a file and this needs to be
 * found on the classpath that's specified
 *
 * @author Tim Fox
 */
public class ClasspathPathResolver implements PathResolver {

    private static final char FILE_SEP = System.getProperty("file.separator").charAt(0);

    public static Path resolvePath(Path path) {
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        if (cl != null) {
            String spath = path.toString();
            String substituted = FILE_SEP == '/' ? spath : spath.replace(FILE_SEP, '/');
            URL url = cl.getResource(substituted);
            if (url != null) {
                Path thePath = urlToPath(url);
                if (thePath != null) {
                    return thePath;
                }
            }
        }
        return path;
    }

    public static Path urlToPath(URL url) {
        try {
            URI uri = url.toURI();
            if (uri.isOpaque()) {
                // See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4701321
                return Paths.get(URLDecoder.decode(url.getPath(), "UTF-8"));
            } else {
                return Paths.get(uri);
            }
        } catch (Exception exc) {
            throw new AsyncException(exc);
        }
    }


    @Override
    public Path resolve(Path path) {
        return resolvePath(path);
    }
}