com.facebook.hiveio.common.NativeCodeHelper.java Source code

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Here is the source code for com.facebook.hiveio.common.NativeCodeHelper.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.hiveio.common;

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

import java.io.File;
import java.io.IOException;
import java.net.URL;

/**
 * Helper for loading native libraries
 */
public class NativeCodeHelper {
    /** Don't construct */
    protected NativeCodeHelper() {
    }

    /**
     * Load a library
     *
     * @param name String name of library
     * @throws IOException
     */
    protected static void loadLibrary(String name) throws IOException {
        URL url = Resources.getResource(HadoopNative.class, getLibraryPath(name));
        File file = File.createTempFile(name, null);
        file.deleteOnExit();
        Files.copy(Resources.newInputStreamSupplier(url), file);
        System.load(file.getAbsolutePath());
    }

    /**
     * Get platform specific path to library
     *
     * @param name String name of library
     * @return platform specific path to library
     */
    protected static String getLibraryPath(String name) {
        return "/nativelib/" + getPlatform() + "/" + System.mapLibraryName(name);
    }

    /**
     * Get platform we're on
     *
     * @return platform string
     */
    protected static String getPlatform() {
        String name = System.getProperty("os.name");
        String arch = System.getProperty("os.arch");
        return (name + "-" + arch).replace(' ', '_');
    }
}