ARROW-1304: [Java] Fix Indentation, WhitespaceAround and EmptyLineSeparator checkstyle warnings in Java

java/memory/src/main/java/io/netty/buffer/ArrowBuf.java

@@ -406,12 +406,12 @@ public ByteBuffer internalNioBuffer(int index, int length) {
 
   @Override
   public ByteBuffer[] nioBuffers() {
-    return new ByteBuffer[]{nioBuffer()};
+    return new ByteBuffer[] {nioBuffer()};
   }
 
   @Override
   public ByteBuffer[] nioBuffers(int index, int length) {
-    return new ByteBuffer[]{nioBuffer(index, length)};
+    return new ByteBuffer[] {nioBuffer(index, length)};
   }
 
   @Override

java/memory/src/main/java/org/apache/arrow/memory/Accountant.java

@@ -249,9 +249,9 @@ public long getPeakMemoryAllocation() {
     return peakAllocation.get();
   }
 
-  public long getHeadroom(){
+  public long getHeadroom() {
     long localHeadroom = allocationLimit.get() - locallyHeldMemory.get();
-    if(parent == null){
+    if (parent == null) {
       return localHeadroom;
     }
 

java/memory/src/main/java/org/apache/arrow/memory/AllocationManager.java

@@ -328,6 +328,7 @@ private void inc() {
      * Decrement the ledger's reference count. If the ledger is decremented to zero, this ledger
      * should release its
      * ownership back to the AllocationManager
+     *
      * @param decrement amout to decrease the reference count by
      * @return the new reference count
      */

java/memory/src/main/java/org/apache/arrow/memory/BaseAllocator.java

@@ -277,8 +277,7 @@ public ArrowBuf buffer(final int initialRequestSize, BufferManager manager) {
         throw new OutOfMemoryException(e);
       }
       throw e;
-    }
-    finally {
+    } finally {
       if (!success) {
         releaseBytes(actualRequestSize);
       }

java/memory/src/main/java/org/apache/arrow/memory/BufferAllocator.java

@@ -117,9 +117,8 @@ public interface BufferAllocator extends AutoCloseable {
    * Create an allocation reservation. A reservation is a way of building up
    * a request for a buffer whose size is not known in advance. See
    *
-   * @see AllocationReservation
-   *
    * @return the newly created reservation
+   * @see AllocationReservation
    */
   public AllocationReservation newReservation();
 
@@ -128,6 +127,7 @@ public interface BufferAllocator extends AutoCloseable {
    * special because we don't
    * worry about them leaking or managing reference counts on them since they don't actually
    * point to any memory.
+   *
    * @return the empty buffer
    */
   public ArrowBuf getEmpty();
@@ -136,6 +136,7 @@ public interface BufferAllocator extends AutoCloseable {
    * Return the name of this allocator. This is a human readable name that can help debugging.
    * Typically provides
    * coordinates about where this allocator was created
+   *
    * @return the name of the allocator
    */
   public String getName();
@@ -145,6 +146,7 @@ public interface BufferAllocator extends AutoCloseable {
    * that an allocator is
    * over its limit, all consumers of that allocator should aggressively try to addrss the
    * overlimit situation.
+   *
    * @return whether or not this allocator (or one if its parents) is over its limits
    */
   public boolean isOverLimit();

java/memory/src/main/java/org/apache/arrow/memory/util/HistoricalLog.java

@@ -97,7 +97,7 @@ public synchronized void recordEvent(final String noteFormat, Object... args) {
    * includes the identifying string provided at construction time, and all the recorded
    * events with their stack traces.
    *
-   * @param sb {@link StringBuilder} to write to
+   * @param sb                {@link StringBuilder} to write to
    * @param includeStackTrace whether to include the stacktrace of each event in the history
    */
   public void buildHistory(final StringBuilder sb, boolean includeStackTrace) {
@@ -106,8 +106,9 @@ public void buildHistory(final StringBuilder sb, boolean includeStackTrace) {
 
   /**
    * build the history and write it to sb
-   * @param sb output
-   * @param indent starting indent (usually "")
+   *
+   * @param sb                output
+   * @param indent            starting indent (usually "")
    * @param includeStackTrace whether to include the stacktrace of each event.
    */
   public synchronized void buildHistory(

java/memory/src/test/java/org/apache/arrow/memory/TestAccountant.java

@@ -15,6 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.apache.arrow.memory;
 
 import static org.junit.Assert.assertEquals;

java/memory/src/test/java/org/apache/arrow/memory/TestBaseAllocator.java

@@ -15,6 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.apache.arrow.memory;
 
 import static org.junit.Assert.assertEquals;
@@ -59,13 +60,13 @@ public void checkBuffers() {
 
   @Test
   public void test_privateMax() throws Exception {
-    try(final RootAllocator rootAllocator =
-        new RootAllocator(MAX_ALLOCATION)) {
+    try (final RootAllocator rootAllocator =
+             new RootAllocator(MAX_ALLOCATION)) {
       final ArrowBuf arrowBuf1 = rootAllocator.buffer(MAX_ALLOCATION / 2);
       assertNotNull("allocation failed", arrowBuf1);
 
-      try(final BufferAllocator childAllocator =
-          rootAllocator.newChildAllocator("noLimits", 0, MAX_ALLOCATION)) {
+      try (final BufferAllocator childAllocator =
+               rootAllocator.newChildAllocator("noLimits", 0, MAX_ALLOCATION)) {
         final ArrowBuf arrowBuf2 = childAllocator.buffer(MAX_ALLOCATION / 2);
         assertNotNull("allocation failed", arrowBuf2);
         arrowBuf2.release();
@@ -75,11 +76,11 @@ public void test_privateMax() throws Exception {
     }
   }
 
-  @Test(expected=IllegalStateException.class)
+  @Test(expected = IllegalStateException.class)
   public void testRootAllocator_closeWithOutstanding() throws Exception {
     try {
-      try(final RootAllocator rootAllocator =
-          new RootAllocator(MAX_ALLOCATION)) {
+      try (final RootAllocator rootAllocator =
+               new RootAllocator(MAX_ALLOCATION)) {
         final ArrowBuf arrowBuf = rootAllocator.buffer(512);
         assertNotNull("allocation failed", arrowBuf);
       }
@@ -100,8 +101,8 @@ public void testRootAllocator_closeWithOutstanding() throws Exception {
 
   @Test
   public void testRootAllocator_getEmpty() throws Exception {
-    try(final RootAllocator rootAllocator =
-        new RootAllocator(MAX_ALLOCATION)) {
+    try (final RootAllocator rootAllocator =
+             new RootAllocator(MAX_ALLOCATION)) {
       final ArrowBuf arrowBuf = rootAllocator.buffer(0);
       assertNotNull("allocation failed", arrowBuf);
       assertEquals("capacity was non-zero", 0, arrowBuf.capacity());
@@ -112,17 +113,17 @@ public void testRootAllocator_getEmpty() throws Exception {
   @Ignore // TODO(DRILL-2740)
   @Test(expected = IllegalStateException.class)
   public void testAllocator_unreleasedEmpty() throws Exception {
-    try(final RootAllocator rootAllocator =
-        new RootAllocator(MAX_ALLOCATION)) {
+    try (final RootAllocator rootAllocator =
+             new RootAllocator(MAX_ALLOCATION)) {
       @SuppressWarnings("unused")
       final ArrowBuf arrowBuf = rootAllocator.buffer(0);
     }
   }
 
   @Test
   public void testAllocator_transferOwnership() throws Exception {
-    try(final RootAllocator rootAllocator =
-        new RootAllocator(MAX_ALLOCATION)) {
+    try (final RootAllocator rootAllocator =
+             new RootAllocator(MAX_ALLOCATION)) {
       final BufferAllocator childAllocator1 =
           rootAllocator.newChildAllocator("changeOwnership1", 0, MAX_ALLOCATION);
       final BufferAllocator childAllocator2 =
@@ -197,7 +198,7 @@ public void testRootAllocator_createChildAndUse() throws Exception {
     }
   }
 
-  @Test(expected=IllegalStateException.class)
+  @Test(expected = IllegalStateException.class)
   public void testRootAllocator_createChildDontClose() throws Exception {
     try {
       try (final RootAllocator rootAllocator = new RootAllocator(MAX_ALLOCATION)) {
@@ -232,33 +233,33 @@ private static void allocateAndFree(final BufferAllocator allocator) {
 
     final int nBufs = 8;
     final ArrowBuf[] arrowBufs = new ArrowBuf[nBufs];
-    for(int i = 0; i < arrowBufs.length; ++i) {
+    for (int i = 0; i < arrowBufs.length; ++i) {
       ArrowBuf arrowBufi = allocator.buffer(MAX_ALLOCATION / nBufs);
       assertNotNull("allocation failed", arrowBufi);
       arrowBufs[i] = arrowBufi;
     }
-    for(ArrowBuf arrowBufi : arrowBufs) {
+    for (ArrowBuf arrowBufi : arrowBufs) {
       arrowBufi.release();
     }
   }
 
   @Test
   public void testAllocator_manyAllocations() throws Exception {
-    try(final RootAllocator rootAllocator =
-        new RootAllocator(MAX_ALLOCATION)) {
-      try(final BufferAllocator childAllocator =
-          rootAllocator.newChildAllocator("manyAllocations", 0, MAX_ALLOCATION)) {
+    try (final RootAllocator rootAllocator =
+             new RootAllocator(MAX_ALLOCATION)) {
+      try (final BufferAllocator childAllocator =
+               rootAllocator.newChildAllocator("manyAllocations", 0, MAX_ALLOCATION)) {
         allocateAndFree(childAllocator);
       }
     }
   }
 
   @Test
   public void testAllocator_overAllocate() throws Exception {
-    try(final RootAllocator rootAllocator =
-        new RootAllocator(MAX_ALLOCATION)) {
-      try(final BufferAllocator childAllocator =
-          rootAllocator.newChildAllocator("overAllocate", 0, MAX_ALLOCATION)) {
+    try (final RootAllocator rootAllocator =
+             new RootAllocator(MAX_ALLOCATION)) {
+      try (final BufferAllocator childAllocator =
+               rootAllocator.newChildAllocator("overAllocate", 0, MAX_ALLOCATION)) {
         allocateAndFree(childAllocator);
 
         try {
@@ -273,10 +274,10 @@ public void testAllocator_overAllocate() throws Exception {
 
   @Test
   public void testAllocator_overAllocateParent() throws Exception {
-    try(final RootAllocator rootAllocator =
-        new RootAllocator(MAX_ALLOCATION)) {
-      try(final BufferAllocator childAllocator =
-          rootAllocator.newChildAllocator("overAllocateParent", 0, MAX_ALLOCATION)) {
+    try (final RootAllocator rootAllocator =
+             new RootAllocator(MAX_ALLOCATION)) {
+      try (final BufferAllocator childAllocator =
+               rootAllocator.newChildAllocator("overAllocateParent", 0, MAX_ALLOCATION)) {
         final ArrowBuf arrowBuf1 = rootAllocator.buffer(MAX_ALLOCATION / 2);
         assertNotNull("allocation failed", arrowBuf1);
         final ArrowBuf arrowBuf2 = childAllocator.buffer(MAX_ALLOCATION / 2);
@@ -326,7 +327,7 @@ public void testAllocator_createSlices() throws Exception {
 
       try (final BufferAllocator childAllocator = rootAllocator.newChildAllocator("createSlices", 0, MAX_ALLOCATION)) {
         try (final BufferAllocator childAllocator2 =
-            childAllocator.newChildAllocator("createSlices", 0, MAX_ALLOCATION)) {
+                 childAllocator.newChildAllocator("createSlices", 0, MAX_ALLOCATION)) {
           final ArrowBuf arrowBuf1 = childAllocator2.buffer(MAX_ALLOCATION / 8);
           @SuppressWarnings("unused")
           final ArrowBuf arrowBuf2 = arrowBuf1.slice(MAX_ALLOCATION / 16, MAX_ALLOCATION / 16);
@@ -345,8 +346,8 @@ public void testAllocator_createSlices() throws Exception {
   @Test
   public void testAllocator_sliceRanges() throws Exception {
 //    final AllocatorOwner allocatorOwner = new NamedOwner("sliceRanges");
-    try(final RootAllocator rootAllocator =
-        new RootAllocator(MAX_ALLOCATION)) {
+    try (final RootAllocator rootAllocator =
+             new RootAllocator(MAX_ALLOCATION)) {
       // Populate a buffer with byte values corresponding to their indices.
       final ArrowBuf arrowBuf = rootAllocator.buffer(256);
       assertEquals(256, arrowBuf.capacity());
@@ -362,7 +363,7 @@ public void testAllocator_sliceRanges() throws Exception {
 //      assertEquals(256, slice3.capacity());
 //      assertEquals(256, slice3.writableBytes());
 
-      for(int i = 0; i < 256; ++i) {
+      for (int i = 0; i < 256; ++i) {
         arrowBuf.writeByte(i);
       }
       assertEquals(0, arrowBuf.readerIndex());
@@ -373,18 +374,18 @@ public void testAllocator_sliceRanges() throws Exception {
       final ArrowBuf slice1 = (ArrowBuf) arrowBuf.slice();
       assertEquals(0, slice1.readerIndex());
       assertEquals(256, slice1.readableBytes());
-      for(int i = 0; i < 10; ++i) {
+      for (int i = 0; i < 10; ++i) {
         assertEquals(i, slice1.readByte());
       }
       assertEquals(256 - 10, slice1.readableBytes());
-      for(int i = 0; i < 256; ++i) {
+      for (int i = 0; i < 256; ++i) {
         assertEquals((byte) i, slice1.getByte(i));
       }
 
       final ArrowBuf slice2 = arrowBuf.slice(25, 25);
       assertEquals(0, slice2.readerIndex());
       assertEquals(25, slice2.readableBytes());
-      for(int i = 25; i < 50; ++i) {
+      for (int i = 25; i < 50; ++i) {
         assertEquals(i, slice2.readByte());
       }
 
@@ -404,32 +405,32 @@ public void testAllocator_sliceRanges() throws Exception {
   @Test
   public void testAllocator_slicesOfSlices() throws Exception {
 //    final AllocatorOwner allocatorOwner = new NamedOwner("slicesOfSlices");
-    try(final RootAllocator rootAllocator =
-        new RootAllocator(MAX_ALLOCATION)) {
+    try (final RootAllocator rootAllocator =
+             new RootAllocator(MAX_ALLOCATION)) {
       // Populate a buffer with byte values corresponding to their indices.
       final ArrowBuf arrowBuf = rootAllocator.buffer(256);
-      for(int i = 0; i < 256; ++i) {
+      for (int i = 0; i < 256; ++i) {
         arrowBuf.writeByte(i);
       }
 
       // Slice it up.
       final ArrowBuf slice0 = arrowBuf.slice(0, arrowBuf.capacity());
-      for(int i = 0; i < 256; ++i) {
+      for (int i = 0; i < 256; ++i) {
         assertEquals((byte) i, arrowBuf.getByte(i));
       }
 
       final ArrowBuf slice10 = slice0.slice(10, arrowBuf.capacity() - 10);
-      for(int i = 10; i < 256; ++i) {
+      for (int i = 10; i < 256; ++i) {
         assertEquals((byte) i, slice10.getByte(i - 10));
       }
 
       final ArrowBuf slice20 = slice10.slice(10, arrowBuf.capacity() - 20);
-      for(int i = 20; i < 256; ++i) {
+      for (int i = 20; i < 256; ++i) {
         assertEquals((byte) i, slice20.getByte(i - 20));
       }
 
-      final ArrowBuf slice30 = slice20.slice(10,  arrowBuf.capacity() - 30);
-      for(int i = 30; i < 256; ++i) {
+      final ArrowBuf slice30 = slice20.slice(10, arrowBuf.capacity() - 30);
+      for (int i = 30; i < 256; ++i) {
         assertEquals((byte) i, slice30.getByte(i - 30));
       }
 
@@ -556,8 +557,8 @@ public void testAllocator_transferShared() throws Exception {
   public void testAllocator_unclaimedReservation() throws Exception {
     try (final RootAllocator rootAllocator = new RootAllocator(MAX_ALLOCATION)) {
       try (final BufferAllocator childAllocator1 =
-          rootAllocator.newChildAllocator("unclaimedReservation", 0, MAX_ALLOCATION)) {
-        try(final AllocationReservation reservation = childAllocator1.newReservation()) {
+               rootAllocator.newChildAllocator("unclaimedReservation", 0, MAX_ALLOCATION)) {
+        try (final AllocationReservation reservation = childAllocator1.newReservation()) {
           assertTrue(reservation.add(64));
         }
         rootAllocator.verify();

java/memory/src/test/java/org/apache/arrow/memory/TestEndianess.java

@@ -15,9 +15,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.apache.arrow.memory;
 
 import static org.junit.Assert.assertEquals;
+
 import io.netty.buffer.ByteBuf;
 
 import org.apache.arrow.memory.BufferAllocator;

java/tools/src/main/java/org/apache/arrow/tools/EchoServer.java

@@ -73,7 +73,9 @@ public void run() throws IOException {
         LOGGER.info("Closed connection with client");
       }
     } catch (java.net.SocketException ex) {
-      if (!closed) throw ex;
+      if (!closed) {
+        throw ex;
+      }
     } finally {
       serverSocket.close();
       LOGGER.info("Server closed.");

java/tools/src/main/java/org/apache/arrow/tools/FileRoundtrip.java

@@ -44,6 +44,7 @@ public class FileRoundtrip {
   private final Options options;
   private final PrintStream out;
   private final PrintStream err;
+
   FileRoundtrip(PrintStream out, PrintStream err) {
     this.out = out;
     this.err = err;