Extracted the strategy for finding native library out of Native.

src/main/java/net/rubygrapefruit/platform/Native.java

@@ -1,10 +1,10 @@
 package net.rubygrapefruit.platform;
 
-import net.rubygrapefruit.platform.internal.*;
+import net.rubygrapefruit.platform.internal.NativeLibraryLocator;
+import net.rubygrapefruit.platform.internal.Platform;
 import net.rubygrapefruit.platform.internal.jni.NativeLibraryFunctions;
 
-import java.io.*;
+import java.io.File;
-import java.net.URL;
 
 /**
  * Provides access to the native integrations. Use {@link #get(Class)} to load a particular integration.
@@ -27,30 +27,14 @@ public class Native {
             if (!loaded) {
                 Platform platform = Platform.current();
                 try {
-                    File libFile;
+                    File libFile = new NativeLibraryLocator(extractDir).find(platform.getLibraryName());
-                    URL resource = Native.class.getClassLoader().getResource(platform.getLibraryName());
+                    if (libFile == null) {
-                    if (resource != null) {
-                        File libDir = extractDir;
-                        if (libDir == null) {
-                            libDir = File.createTempFile("native-platform", "dir");
-                            libDir.delete();
-                            libDir.mkdirs();
-                        }
-                        libFile = new File(libDir, platform.getLibraryName());
-                        libFile.deleteOnExit();
-                        copy(resource, libFile);
-                    } else {
-                        libFile = new File("build/binaries/" + platform.getLibraryName());
-                    }
-                    if (!libFile.isFile()) {
                         throw new NativeIntegrationUnavailableException(String.format("Native library is not available for this operating system and architecture."));
                     }
                     System.load(libFile.getCanonicalPath());
                     int nativeVersion = NativeLibraryFunctions.getVersion();
                     if (nativeVersion != NativeLibraryFunctions.VERSION) {
-                        throw new NativeException(String.format(
+                        throw new NativeException(String.format("Unexpected native library version loaded. Expected %s, was %s.", nativeVersion, NativeLibraryFunctions.VERSION));
-                                "Unexpected native library version loaded. Expected %s, was %s.", nativeVersion,
-                                NativeLibraryFunctions.VERSION));
                     }
                     loaded = true;
                 } catch (NativeException e) {
@@ -82,29 +66,4 @@ public class Native {
             throw new NativeException(String.format("Failed to load native integration %s.", type.getSimpleName()), t);
         }
     }
-
-    private static void copy(URL source, File dest) {
-        try {
-            InputStream inputStream = source.openStream();
-            try {
-                OutputStream outputStream = new FileOutputStream(dest);
-                try {
-                    byte[] buffer = new byte[4096];
-                    while (true) {
-                        int nread = inputStream.read(buffer);
-                        if (nread < 0) {
-                            break;
-                        }
-                        outputStream.write(buffer, 0, nread);
-                    }
-                } finally {
-                    outputStream.close();
-                }
-            } finally {
-                inputStream.close();
-            }
-        } catch (IOException e) {
-            throw new NativeException(String.format("Could not extract native JNI library."), e);
-        }
-    }
 }

src/main/java/net/rubygrapefruit/platform/internal/NativeLibraryLocator.java

@@ -0,0 +1,63 @@
+package net.rubygrapefruit.platform.internal;
+
+import net.rubygrapefruit.platform.NativeException;
+
+import java.io.*;
+import java.net.URL;
+
+public class NativeLibraryLocator {
+    private final File extractDir;
+
+    public NativeLibraryLocator(File extractDir) {
+        this.extractDir = extractDir;
+    }
+
+    public File find(String libraryName) throws IOException {
+        File libFile;
+        URL resource = getClass().getClassLoader().getResource(libraryName);
+        if (resource != null) {
+            File libDir = extractDir;
+            if (libDir == null) {
+                libDir = File.createTempFile("native-platform", "dir");
+                libDir.delete();
+                libDir.mkdirs();
+            }
+            libFile = new File(libDir, libraryName);
+            libFile.deleteOnExit();
+            copy(resource, libFile);
+            return libFile;
+        }
+
+        libFile = new File("build/binaries/" + libraryName);
+        if (libFile.isFile()) {
+            return libFile;
+        }
+
+        return null;
+    }
+
+    private static void copy(URL source, File dest) {
+        try {
+            InputStream inputStream = source.openStream();
+            try {
+                OutputStream outputStream = new FileOutputStream(dest);
+                try {
+                    byte[] buffer = new byte[4096];
+                    while (true) {
+                        int nread = inputStream.read(buffer);
+                        if (nread < 0) {
+                            break;
+                        }
+                        outputStream.write(buffer, 0, nread);
+                    }
+                } finally {
+                    outputStream.close();
+                }
+            } finally {
+                inputStream.close();
+            }
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not extract native JNI library."), e);
+        }
+    }
+}