r.util.FileSystemUtils.java Source code

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Here is the source code for r.util.FileSystemUtils.java

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/*
 * R : A Computer Language for Statistical Data Analysis
 * Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
 * Copyright (C) 1997--2008  The R Development Core Team
 * Copyright (C) 2003, 2004  The R Foundation
 * Copyright (C) 2010 bedatadriven
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package r.util;

import java.io.File;
import java.util.regex.Pattern;

import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileSystemManager;

import com.google.common.annotations.VisibleForTesting;

public class FileSystemUtils {

    private static final Pattern R_PACKAGE_PATTERN = Pattern.compile("[^/]+/Meta/package\\.rds");

    /**
     *
     * @return  the path to the R home directory as packaged within
     * the renjin-core.jar archive. This will be a layered URI in the form
     * jar:file:///path/to/renjin-core.jar!/r/library
     */
    public static String homeDirectoryInCoreJar() {
        // hardcode to the R home location to the classpath location
        // where this class is found.

        return RHomeFromSEXPClassURL(r.base.System.class.getResource("/r/lang/SEXP.class").toString());
    }

    @VisibleForTesting
    public static String RHomeFromSEXPClassURL(String url) {
        String homeUrl = url.substring(0, url.length() - "/r/lang/SEXP.class".length()) + "/r";
        if (homeUrl.startsWith("jar:file")) {

        }
        if (homeUrl.startsWith("file:/")) {
            homeUrl = homeUrl.substring("file:".length());
        }
        return homeUrl;
    }

    /**
     *
     * @return a default, semi-colon delimited, set of paths in which to search for libraries
     * that includes all jars and directories on the classpath ({@code System.getProperty(java.class.path)}
     */
    public static String defaultLibraryPaths() {
        return libraryPathsFromClassPath(System.getProperty("java.class.path"));
    }

    @VisibleForTesting
    public static String libraryPathsFromClassPath(String classPathString) {
        StringBuilder path = new StringBuilder();
        if (classPathString != null) {
            String classPaths[] = classPathString.split(File.pathSeparator);
            for (String classPath : classPaths) {
                String libraryPath = libraryPathFromClassPathEntry(classPath);
                if (libraryPath != null) {
                    if (path.length() != 0) {
                        path.append(";");
                    }
                    path.append(libraryPath);
                }
            }
        }
        return path.toString();
    }

    public static String libraryPathFromClassPathEntry(String classPath) {
        if (classPath.endsWith(".jar")) {
            return libraryPathFromJarFile(classPath);
        } else {
            return libraryPathFromFolder(classPath);
        }
    }

    public static String libraryPathFromFolder(String classPath) {
        try {
            return new File(classPath).getAbsolutePath();
        } catch (Exception e) {
            // we can get security exceptions for some jars
            return null;
        }
    }

    public static String libraryPathFromJarFile(String classPath) {
        return "jar:file://" + absolutePath(classPath);
    }

    private static String absolutePath(String path) {
        return new File(path).getAbsolutePath();
    }

    public static FileObject workingDirectory(FileSystemManager fileSystemManager) {
        try {
            return fileSystemManager.resolveFile(new File("").getAbsolutePath());
        } catch (FileSystemException e) {
            throw new RuntimeException("Could not resolve current working directory", e);
        }
    }
}