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NativeLibraryLoader.java
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NativeLibraryLoader.java
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package org.genericsystem.cv.utils;
import java.lang.invoke.MethodHandles;
import org.opencv.core.Core;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Helper class to wrap OpenCV native library loading.
*/
public class NativeLibraryLoader {
/**
* Boolean value set to true as soon as the library is loaded.
*/
private static boolean loaded = false;
/**
* Default library path. Can be overridden using {@link #load(String)} and providing the new path.
*/
private static final String libraryPath = "/usr/local/share/OpenCV/java/libopencv_java400.so";
/**
* Path that is used when all other attempts have failed. Defaults to the folder where opencv was built.
*/
private static final String fallbackPath = System.getenv("HOME") + "/opencv/build/lib/libopencv_java400.so";
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
/**
* Load OpenCV native library with default arguments.
*/
public static void load() {
load(libraryPath);
}
/**
* Load OpenCV native library from a specific location.
*
* @param nativeLibraryPath - the location of OpenCV native library
*/
public static void load(String nativeLibraryPath) {
if (!loaded) {
loaded = loadFromLibrarypath(nativeLibraryPath);
// loaded = true;
} else {
logger.debug("Native library already loaded.");
}
}
private static boolean loadFromLibrarypath(String nativeLibraryPath) {
try {
logger.debug("java.library.path: {}", System.getProperty("java.library.path"));
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
return true;
} catch (UnsatisfiedLinkError e) {
logger.info("Unable to load the library from java.library.path! Using absolute path instead ({})", nativeLibraryPath);
return loadFromAbsolutePath(nativeLibraryPath);
}
}
private static boolean loadFromAbsolutePath(String nativeLibraryPath) {
try {
System.load(nativeLibraryPath);
return true;
} catch (UnsatisfiedLinkError e) {
logger.info("Unable to load the library from {}. Using fallback path ({})", nativeLibraryPath, fallbackPath);
return loadFromAlternatePath();
}
}
private static boolean loadFromAlternatePath() throws RuntimeException {
try {
System.load(fallbackPath);
return true;
} catch (UnsatisfiedLinkError e) {
throw new RuntimeException("Unable to load OpenCV native library", e);
}
}
}