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A library for loading native libraries.
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/*
 * #%L
 * Native library loader for extracting and loading native libraries from Java.
 * %%
 * Copyright (C) 2010 - 2023 Board of Regents of the University of
 * Wisconsin-Madison and Glencoe Software, Inc.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. 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.
 * 
 * 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 HOLDERS 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.
 * #L%
 */

// This code is derived from Richard van der Hoff's mx-native-loader project:
// http://opensource.mxtelecom.com/maven/repo/com/wapmx/native/mx-native-loader/1.7/
// See NOTICE.txt for details.

// Copyright 2009 MX Telecom Ltd

package org.scijava.nativelib;

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

/**
 * JniExtractor suitable for single application deployments per virtual machine
 * 
 * WARNING: This extractor can result in UnsatisifiedLinkError if it is used in
 * more than one classloader.
 * 
 * @author Richard van der Hoff ([email protected])
 */
public class DefaultJniExtractor extends BaseJniExtractor {

	/**
	 * this is where native dependencies are extracted to (e.g. tmplib/).
	 */
	private File nativeDir;

	public DefaultJniExtractor(final Class libraryJarClass) throws IOException {
		super(libraryJarClass);

		nativeDir = getTempDir();
		// Order of operations is such that we do not error if we are racing with
		// another thread to create the directory.
		nativeDir.mkdirs();
		if (!nativeDir.isDirectory()) {
			throw new IOException(
				"Unable to create native library working directory " + nativeDir);
		}
		nativeDir.deleteOnExit();
	}

	@Override
	public File getJniDir() {
		return nativeDir;
	}

	@Override
	public File getNativeDir() {
		return nativeDir;
	}

}