com.google.protobuf

Class UnsafeUtil

java.lang.Object

com.google.protobuf.UnsafeUtil

final class UnsafeUtil
extends java.lang.Object

Utility class for working with unsafe operations.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	UnsafeUtil.JvmMemoryAccessor
private static class	UnsafeUtil.MemoryAccessor

Field Summary

Fields

Modifier and Type	Field and Description
private static long	ARRAY_BASE_OFFSET
private static long	BUFFER_ADDRESS_OFFSET
private static boolean	HAS_UNSAFE_ARRAY_OPERATIONS
private static boolean	HAS_UNSAFE_BYTEBUFFER_OPERATIONS
private static boolean	HAS_UNSAFE_COPY_MEMORY
private static java.util.logging.Logger	logger
private static UnsafeUtil.MemoryAccessor	MEMORY_ACCESSOR
private static sun.misc.Unsafe	UNSAFE

Constructor Summary

Constructors

Modifier	Constructor and Description
private	UnsafeUtil()

Method Summary

Modifier and Type	Method and Description
(package private) static long	addressOffset(java.nio.ByteBuffer buffer) Gets the offset of the address field of the given direct ByteBuffer.
private static java.lang.reflect.Field	bufferAddressField() Finds the address field within a direct Buffer.
private static int	byteArrayBaseOffset() Get the base offset for byte arrays, or -1 if sun.misc.Unsafe is not available.
(package private) static void	copyMemory(long srcAddress, long targetAddress, long length)
(package private) static void	copyMemory(java.lang.Object src, long srcOffset, java.lang.Object target, long targetOffset, long length)
private static java.lang.reflect.Field	field(java.lang.Class<?> clazz, java.lang.String fieldName) Gets the field with the given name within the class, or null if not found.
private static long	fieldOffset(java.lang.reflect.Field field) Returns the offset of the provided field, or -1 if sun.misc.Unsafe is not available.
(package private) static long	getArrayBaseOffset()
(package private) static boolean	getBoolean(java.lang.Object target, long offset)
(package private) static byte	getByte(long address)
(package private) static byte	getByte(java.lang.Object target, long offset)
private static <T> java.lang.Class<T>	getClassForName(java.lang.String name)
(package private) static double	getDouble(java.lang.Object target, long offset)
(package private) static float	getFloat(java.lang.Object target, long offset)
(package private) static int	getInt(long address)
(package private) static int	getInt(java.lang.Object target, long offset)
(package private) static long	getLong(long address)
(package private) static long	getLong(java.lang.Object target, long offset)
private static UnsafeUtil.MemoryAccessor	getMemoryAccessor() Get a UnsafeUtil.MemoryAccessor appropriate for the platform, or null if not supported.
(package private) static java.lang.Object	getObject(java.lang.Object target, long offset)
(package private) static java.lang.Object	getStaticObject(java.lang.reflect.Field field)
private static sun.misc.Unsafe	getUnsafe() Gets the sun.misc.Unsafe instance, or null if not available on this platform.
(package private) static boolean	hasUnsafeArrayOperations()
(package private) static boolean	hasUnsafeByteBufferOperations()
(package private) static boolean	hasUnsafeCopyMemory()
(package private) static long	objectFieldOffset(java.lang.reflect.Field field)
(package private) static void	putBoolean(java.lang.Object target, long offset, boolean value)
(package private) static void	putByte(long address, byte value)
(package private) static void	putByte(java.lang.Object target, long offset, byte value)
(package private) static void	putDouble(java.lang.Object target, long offset, double value)
(package private) static void	putFloat(java.lang.Object target, long offset, float value)
(package private) static void	putInt(long address, int value)
(package private) static void	putInt(java.lang.Object target, long offset, int value)
(package private) static void	putLong(long address, long value)
(package private) static void	putLong(java.lang.Object target, long offset, long value)
(package private) static void	putObject(java.lang.Object target, long offset, java.lang.Object value)
private static boolean	supportsUnsafeArrayOperations() Indicates whether or not unsafe array operations are supported on this platform.
private static boolean	supportsUnsafeByteBufferOperations()
private static boolean	supportsUnsafeCopyMemory() Indicates whether or not unsafe copyMemory(object, long, object, long, long) operations are supported on this platform.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

private static final java.util.logging.Logger logger

UNSAFE

private static final sun.misc.Unsafe UNSAFE

MEMORY_ACCESSOR

private static final UnsafeUtil.MemoryAccessor MEMORY_ACCESSOR

HAS_UNSAFE_BYTEBUFFER_OPERATIONS

private static final boolean HAS_UNSAFE_BYTEBUFFER_OPERATIONS

HAS_UNSAFE_ARRAY_OPERATIONS

private static final boolean HAS_UNSAFE_ARRAY_OPERATIONS

HAS_UNSAFE_COPY_MEMORY

private static final boolean HAS_UNSAFE_COPY_MEMORY

ARRAY_BASE_OFFSET

private static final long ARRAY_BASE_OFFSET

BUFFER_ADDRESS_OFFSET

private static final long BUFFER_ADDRESS_OFFSET

Constructor Detail

UnsafeUtil

private UnsafeUtil()

Method Detail

hasUnsafeArrayOperations

static boolean hasUnsafeArrayOperations()

hasUnsafeCopyMemory

static boolean hasUnsafeCopyMemory()

hasUnsafeByteBufferOperations

static boolean hasUnsafeByteBufferOperations()

objectFieldOffset

static long objectFieldOffset(java.lang.reflect.Field field)

getArrayBaseOffset

static long getArrayBaseOffset()

getByte

static byte getByte(java.lang.Object target,
                    long offset)

putByte

static void putByte(java.lang.Object target,
                    long offset,
                    byte value)

getInt

static int getInt(java.lang.Object target,
                  long offset)

putInt

static void putInt(java.lang.Object target,
                   long offset,
                   int value)

getLong

static long getLong(java.lang.Object target,
                    long offset)

putLong

static void putLong(java.lang.Object target,
                    long offset,
                    long value)

getBoolean

static boolean getBoolean(java.lang.Object target,
                          long offset)

putBoolean

static void putBoolean(java.lang.Object target,
                       long offset,
                       boolean value)

getFloat

static float getFloat(java.lang.Object target,
                      long offset)

putFloat

static void putFloat(java.lang.Object target,
                     long offset,
                     float value)

getDouble

static double getDouble(java.lang.Object target,
                        long offset)

putDouble

static void putDouble(java.lang.Object target,
                      long offset,
                      double value)

getObject

static java.lang.Object getObject(java.lang.Object target,
                                  long offset)

putObject

static void putObject(java.lang.Object target,
                      long offset,
                      java.lang.Object value)

copyMemory

static void copyMemory(java.lang.Object src,
                       long srcOffset,
                       java.lang.Object target,
                       long targetOffset,
                       long length)

getByte

static byte getByte(long address)

putByte

static void putByte(long address,
                    byte value)

getInt

static int getInt(long address)

putInt

static void putInt(long address,
                   int value)

getLong

static long getLong(long address)

putLong

static void putLong(long address,
                    long value)

copyMemory

static void copyMemory(long srcAddress,
                       long targetAddress,
                       long length)

addressOffset

static long addressOffset(java.nio.ByteBuffer buffer)

Gets the offset of the address field of the given direct ByteBuffer.

getStaticObject

static java.lang.Object getStaticObject(java.lang.reflect.Field field)

getUnsafe

private static sun.misc.Unsafe getUnsafe()

Gets the sun.misc.Unsafe instance, or null if not available on this platform.

getMemoryAccessor

private static UnsafeUtil.MemoryAccessor getMemoryAccessor()

Get a UnsafeUtil.MemoryAccessor appropriate for the platform, or null if not supported.

supportsUnsafeArrayOperations

private static boolean supportsUnsafeArrayOperations()

Indicates whether or not unsafe array operations are supported on this platform.

supportsUnsafeCopyMemory

private static boolean supportsUnsafeCopyMemory()

Indicates whether or not unsafe copyMemory(object, long, object, long, long) operations are supported on this platform.

supportsUnsafeByteBufferOperations

private static boolean supportsUnsafeByteBufferOperations()

getClassForName

private static <T> java.lang.Class<T> getClassForName(java.lang.String name)

bufferAddressField

private static java.lang.reflect.Field bufferAddressField()

Finds the address field within a direct Buffer.

byteArrayBaseOffset

private static int byteArrayBaseOffset()

Get the base offset for byte arrays, or -1 if sun.misc.Unsafe is not available.

fieldOffset

private static long fieldOffset(java.lang.reflect.Field field)

Returns the offset of the provided field, or -1 if sun.misc.Unsafe is not available.

field

private static java.lang.reflect.Field field(java.lang.Class<?> clazz,
                                             java.lang.String fieldName)

Gets the field with the given name within the class, or null if not found. If found, the field is made accessible.