Package io.pravega.common.util

Interface ArrayView

All Superinterfaces:

BufferView, StructuredReadableBuffer, StructuredWritableBuffer

All Known Implementing Classes:

ByteArraySegment

public interface ArrayView
extends BufferView, StructuredWritableBuffer, StructuredReadableBuffer

Defines a generic read-only view of an index-based, array-like structure.

Nested Class Summary

Nested classes/interfaces inherited from interface io.pravega.common.util.BufferView

BufferView.Collector<ExceptionT extends java.lang.Exception>, BufferView.Reader

Method Summary

Modifier and Type	Method	Description
byte[]	array()	Gets a reference to the backing array for this ArrayView.
int	arrayOffset()	Gets a value indicating the offset in the backing array where this ArrayView starts at.
java.nio.ByteBuffer	asByteBuffer()	Returns a new ByteBuffer that wraps the contents of this ArrayView.
void	copyTo(byte[] target, int targetOffset, int length)	Copies a specified number of bytes from this ArrayView into the given target array.
ArrayView	slice(int offset, int length)	Creates a new ArrayView that represents a sub-range of this ArrayView instance.

Methods inherited from interface io.pravega.common.util.BufferView

collect, copyTo, copyTo, getAllocatedLength, getBufferViewReader, getCopy, getLength, getReader, getReader, iterateBuffers, release, retain, slice

Methods inherited from interface io.pravega.common.util.StructuredReadableBuffer

get, getInt, getLong, getShort, getUnsignedLong

Methods inherited from interface io.pravega.common.util.StructuredWritableBuffer

set, setInt, setLong, setShort, setUnsignedLong

Method Detail

array

byte[] array()

Gets a reference to the backing array for this ArrayView. This should be used in conjunction with arrayOffset() in order to determine where in the array this ArrayView starts at. NOTE: Care must be taken when using this array. Just like any other array in Java, it is modifiable and changes to it will be reflected in this ArrayView.

Returns:

The backing array.

arrayOffset

int arrayOffset()

Gets a value indicating the offset in the backing array where this ArrayView starts at.

Returns:

The offset in the backing array.

copyTo

void copyTo(byte[] target,
            int targetOffset,
            int length)

Copies a specified number of bytes from this ArrayView into the given target array.

Parameters:

target - The target array.

targetOffset - The offset within the target array to start copying data at.

length - The number of bytes to copy.

Throws:

java.lang.ArrayIndexOutOfBoundsException - If targetOffset or length are invalid.

slice

ArrayView slice(int offset,
                int length)

Creates a new ArrayView that represents a sub-range of this ArrayView instance. The new instance will share the same backing array as this one, so a change to one will be reflected in the other.

Specified by:

slice in interface BufferView

Parameters:

offset - The starting offset to begin the slice at.

length - The sliced length.

Returns:

A new ArrayView.

asByteBuffer

java.nio.ByteBuffer asByteBuffer()

Returns a new ByteBuffer that wraps the contents of this ArrayView.

Returns:

A ByteBuffer that shares the same backing array as this ArrayView. Any changes made to the ByteBuffer will be reflected in this ArrayView and viceversa.