org.caleydo.core.view.opengl.layout2.internal.SandBoxLibraryLoader.java Source code

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Here is the source code for org.caleydo.core.view.opengl.layout2.internal.SandBoxLibraryLoader.java

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/*******************************************************************************
 * Caleydo - Visualization for Molecular Biology - http://caleydo.org
 * Copyright (c) The Caleydo Team. All rights reserved.
 * Licensed under the new BSD license, available at http://caleydo.org/license
 ******************************************************************************/
package org.caleydo.core.view.opengl.layout2.internal;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.SystemUtils;

import com.google.common.io.ByteStreams;
import com.google.common.io.Files;

public final class SandBoxLibraryLoader {
    /**
     * extract the given library of the classpath and put it to a temporary file
     */
    public static File toTemporaryFile(String libName) throws IOException {
        // convert to native library name
        libName = System.mapLibraryName(libName);
        if (SystemUtils.IS_OS_MAC_OSX)
            libName = StringUtils.replace(libName, ".dylib", ".jnilib");

        // create
        String extension = Files.getFileExtension(libName);
        File file = File.createTempFile(StringUtils.removeEnd(libName, extension), "." + extension);
        file.deleteOnExit();

        URL res = SandBoxLibraryLoader.class.getResource("/" + libName);
        if (res == null)
            throw new FileNotFoundException("can't extract: " + libName);
        try (InputStream in = res.openStream();
                OutputStream to = new BufferedOutputStream(new FileOutputStream(file))) {
            ByteStreams.copy(in, to);
        } catch (IOException e) {
            System.err.println("can't extract: " + libName);
            e.printStackTrace();
            throw new FileNotFoundException("can't extract: " + libName);
        }
        return file;
    }

    /**
     * convention for custom library loader
     */
    public static void loadLibrary(String libName) throws IOException {
        File file = toTemporaryFile(libName);
        // use System.load as it supports absolute file paths
        System.load(file.getAbsolutePath());
    }
}