Moved NativeLoader to Utilities.

src/dorkbox/util/NativeLoader.java

@@ -0,0 +1,94 @@
+/*
+ * Copyright 2016 dorkbox, llc
+ *
+ * Licensed 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 dorkbox.util;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.URL;
+import java.rmi.server.ExportException;
+
+import io.netty.util.internal.PlatformDependent;
+
+/**
+ * Loads the specified library, extracting it from the jar, if necessary
+ */
+public
+class NativeLoader {
+
+    public static
+    void loadLibrary(final String sourceFileName, final String destinationPrefix, final Class<?> classLoaderClass, Version version)
+            throws Exception {
+        try {
+            String suffix;
+            if (OS.isLinux()) {
+                suffix = ".so";
+            }
+            else if (OS.isWindows()) {
+                suffix = ".dll";
+            }
+            else {
+                suffix = ".dylib";
+            }
+
+            final String outputFileName = destinationPrefix + "." + version + suffix;
+
+            final File file = new File(OS.TEMP_DIR, outputFileName);
+            if (!file.canRead()) {
+                ClassLoader loader = PlatformDependent.getClassLoader(classLoaderClass);
+                URL url = loader.getResource(sourceFileName);
+
+                // now we copy it out
+                final InputStream inputStream = url.openStream();
+
+                OutputStream outStream = null;
+                try {
+                    outStream = new FileOutputStream(file);
+
+                    byte[] buffer = new byte[4096];
+                    int read;
+                    while ((read = inputStream.read(buffer)) > 0) {
+                        outStream.write(buffer, 0, read);
+                    }
+
+                    outStream.flush();
+                    outStream.close();
+                    outStream = null;
+                } finally {
+                    try {
+                        inputStream.close();
+                    } catch (Exception ignored) {
+                    }
+                    try {
+                        if (outStream != null) {
+                            outStream.close();
+                        }
+                    } catch (Exception ignored) {
+                    }
+                }
+            }
+
+            System.load(file.getAbsolutePath());
+        } catch (Exception e) {
+            throw new ExportException("Error extracting library: " + sourceFileName, e);
+        }
+    }
+
+    private
+    NativeLoader() {
+    }
+}