import quincy 17.2.0

[ceph.git] / ceph / src / arrow / java / adapter / orc / src / main / java / org / apache / arrow / adapter / orc / OrcJniUtils.java

diff --git a/ceph/src/arrow/java/adapter/orc/src/main/java/org/apache/arrow/adapter/orc/OrcJniUtils.java b/ceph/src/arrow/java/adapter/orc/src/main/java/org/apache/arrow/adapter/orc/OrcJniUtils.java
new file mode 100644 (file)
index 0000000..600569b
--- /dev/null
+++ b/ceph/src/arrow/java/adapter/orc/src/main/java/org/apache/arrow/adapter/orc/OrcJniUtils.java
@@ -0,0 +1,62 @@
+/*
+ * 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 org.apache.arrow.adapter.orc;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
+
+/**
+ * Helper class for JNI related operations.
+ */
+class OrcJniUtils {
+  private static final String LIBRARY_NAME = "arrow_orc_jni";
+  private static boolean isLoaded = false;
+
+  private OrcJniUtils() {}
+
+  static void loadOrcAdapterLibraryFromJar()
+          throws IOException, IllegalAccessException {
+    synchronized (OrcJniUtils.class) {
+      if (!isLoaded) {
+        final String libraryToLoad = System.mapLibraryName(LIBRARY_NAME);
+        final File libraryFile = moveFileFromJarToTemp(
+                System.getProperty("java.io.tmpdir"), libraryToLoad);
+        System.load(libraryFile.getAbsolutePath());
+        isLoaded = true;
+      }
+    }
+  }
+
+  private static File moveFileFromJarToTemp(final String tmpDir, String libraryToLoad)
+          throws IOException {
+    final File temp = File.createTempFile(tmpDir, libraryToLoad);
+    try (final InputStream is = OrcReaderJniWrapper.class.getClassLoader()
+            .getResourceAsStream(libraryToLoad)) {
+      if (is == null) {
+        throw new FileNotFoundException(libraryToLoad);
+      } else {
+        Files.copy(is, temp.toPath(), StandardCopyOption.REPLACE_EXISTING);
+      }
+    }
+    return temp;
+  }
+}