Change enum type from int to byte

java/org/rocksdb/CompressionType.java

@@ -6,20 +6,20 @@
 package org.rocksdb;
 
 public enum CompressionType {
-  NO_COMPRESSION(0),
+  NO_COMPRESSION((byte) 0),
-  SNAPPY_COMPRESSION(1),
+  SNAPPY_COMPRESSION((byte) 1),
-  ZLIB_COMPRESSION(2),
+  ZLIB_COMPRESSION((byte) 2),
-  BZLIB2_COMPRESSION(3),
+  BZLIB2_COMPRESSION((byte) 3),
-  LZ4_COMPRESSION(4),
+  LZ4_COMPRESSION((byte) 4),
-  LZ4HC_COMPRESSION(5);
+  LZ4HC_COMPRESSION((byte) 5);
   
-  private final int value_;
+  private final byte value_;
 
-  private CompressionType(int value) {
+  private CompressionType(byte value) {
     value_ = value;
   }
 
-  public int getValue() {
+  public byte getValue() {
     return value_;
   }
 }

java/org/rocksdb/Options.java

@@ -1328,7 +1328,7 @@ public class Options extends RocksObject {
   public CompressionType compressionType() {
     return CompressionType.values()[compressionType(nativeHandle_)];
   }
-  private native int compressionType(long handle);
+  private native byte compressionType(long handle);
       
   /**
    * Compress blocks using the specified compression algorithm.  This
@@ -1352,7 +1352,7 @@ public class Options extends RocksObject {
     setCompressionType(nativeHandle_, compressionType.getValue());
     return this;
   }
-  private native void setCompressionType(long handle, int compressionType);
+  private native void setCompressionType(long handle, byte compressionType);
 
   /**
    * If true, place whole keys in the filter (not just prefixes).

java/rocksjni/options.cc

@@ -941,7 +941,7 @@ void Java_org_rocksdb_Options_setBlockRestartInterval(
  * Signature: (JI)V
  */
 void Java_org_rocksdb_Options_setCompressionType(
-    JNIEnv* env, jobject jobj, jlong jhandle, jint compression) {
+    JNIEnv* env, jobject jobj, jlong jhandle, jbyte compression) {
   reinterpret_cast<rocksdb::Options*>(jhandle)->compression =
       static_cast<rocksdb::CompressionType>(compression);
 }
@@ -951,7 +951,7 @@ void Java_org_rocksdb_Options_setCompressionType(
  * Method:    compressionType
  * Signature: (J)I
  */
-jint Java_org_rocksdb_Options_compressionType(
+jbyte Java_org_rocksdb_Options_compressionType(
     JNIEnv* env, jobject jobj, jlong jhandle) {
   return reinterpret_cast<rocksdb::Options*>(jhandle)->compression;
 }