程序包 com.google.typography.font.sfntly.data

类 SegmentedGrowableMemoryByteArray

java.lang.Object

com.google.typography.font.sfntly.data.ByteArray<SegmentedGrowableMemoryByteArray>

com.google.typography.font.sfntly.data.SegmentedGrowableMemoryByteArray

final class SegmentedGrowableMemoryByteArray
extends ByteArray<SegmentedGrowableMemoryByteArray>

A growable memory implementation of the ByteArray interface.

作者:

Stuart Gill

字段概要

字段

修饰符和类型	字段	说明
private List<byte[]>	buffers
private static final int	DEFAULT_BUFFER_LOW_BITS
private final int	lowBits

构造器概要

构造器

构造器	说明
SegmentedGrowableMemoryByteArray()	Constructor.
SegmentedGrowableMemoryByteArray(int lowBits)	Constructor.

方法概要

修饰符和类型	方法	说明
private byte[]	buffer(int index)	Get the buffer at the buffer index specified.
private int	bufferIndex(int index)	Calculate the buffer index from the index in the overall "virtual" buffer.
private int	bufferOffset(int bufferIndex, int index)	Calculate the offset within a given buffer from the buffer index and the overall index in the overall "virtual" buffer.
void	close()	Close this instance of the ByteArray.
protected int	internalGet(int index)	Gets the byte at the index given.
protected int	internalGet(int index, byte[] b, int offset, int length)	Gets the bytes at the index given of the given length.
protected void	internalPut(int index, byte b)	Stores the byte at the index given.
protected int	internalPut(int index, byte[] b, int offset, int length)	Stores the array of bytes at the given index.

从类继承的方法 com.google.typography.font.sfntly.data.ByteArray

copyFrom, copyFrom, copyTo, copyTo, copyTo, copyTo, copyTo, get, get, get, growable, length, put, put, put, setFilledLength, size, toString, toString

从类继承的方法 java.lang.Object

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

字段详细资料

DEFAULT_BUFFER_LOW_BITS

private static final int DEFAULT_BUFFER_LOW_BITS

另请参阅:

• 常量字段值

buffers

private List<byte[]> buffers

lowBits

private final int lowBits

构造器详细资料

SegmentedGrowableMemoryByteArray

public SegmentedGrowableMemoryByteArray()

Constructor.

SegmentedGrowableMemoryByteArray

public SegmentedGrowableMemoryByteArray(int lowBits)

Constructor. The low bits parameter is used to set the initial size of the first chained memory buffer used internally. That initial buffer is 2^(low bits) in size and each subsequent buffer is roughly double the preceding one. If this is too small then there will be a number of small buffers and the cost of access will increase. If it's too large then there will a lot of allocated but unused space.

参数:

lowBits - the number of bits to use as the initial buffer index

抛出:

IndexOutOfBoundsException - if the given bounds don't fit within the byte array given

方法详细资料

internalPut

protected void internalPut(int index,
 byte b)

从类复制的说明: ByteArray

Stores the byte at the index given.

指定者:

internalPut 在类中 ByteArray<SegmentedGrowableMemoryByteArray>

参数:

index - the location to store at

b - the byte to store

internalPut

protected int internalPut(int index,
 byte[] b,
 int offset,
 int length)

从类复制的说明: ByteArray

Stores the array of bytes at the given index.

指定者:

internalPut 在类中 ByteArray<SegmentedGrowableMemoryByteArray>

参数:

index - the location to store at

b - the bytes to store

offset - the offset to start from in the byte array

length - the length of the byte array to store from the offset

返回:

the number of bytes actually stored

internalGet

protected int internalGet(int index)

从类复制的说明: ByteArray

Gets the byte at the index given.

指定者:

internalGet 在类中 ByteArray<SegmentedGrowableMemoryByteArray>

参数:

index - the location to get from

返回:

the byte stored at the index

internalGet

protected int internalGet(int index,
 byte[] b,
 int offset,
 int length)

从类复制的说明: ByteArray

Gets the bytes at the index given of the given length.

指定者:

internalGet 在类中 ByteArray<SegmentedGrowableMemoryByteArray>

参数:

index - the location to start getting from

b - the array to put the bytes into

offset - the offset in the array to put the bytes into

length - the length of bytes to read

返回:

the number of bytes actually ready

close

public void close()

从类复制的说明: ByteArray

Close this instance of the ByteArray.

指定者:

close 在类中 ByteArray<SegmentedGrowableMemoryByteArray>

bufferOffset

private int bufferOffset(int bufferIndex,
 int index)

Calculate the offset within a given buffer from the buffer index and the overall index in the overall "virtual" buffer.

参数:

bufferIndex - the index of the buffer where the data is found

index - the index into the overall "virtual" buffer

返回:

the offset in the buffer

另请参阅:

• bufferIndex(int)

bufferIndex

private int bufferIndex(int index)

Calculate the buffer index from the index in the overall "virtual" buffer.

参数:

index - the index into the overall "virtual" buffer

返回:

the buffer index

另请参阅:

• bufferOffset(int, int)

buffer

private byte[] buffer(int index)

Get the buffer at the buffer index specified. If the buffer has not previously been allocated then it is allocated. Any buffers between this buffer and the last previously allocated buffer are also allocated.

参数:

index - the buffer index

返回:

the buffer specified