- java.lang.Object
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- java.nio.Buffer
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- java.nio.ShortBuffer
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- All Implemented Interfaces:
Comparable<ShortBuffer>
public abstract class ShortBuffer extends Buffer implements Comparable<ShortBuffer>
A short buffer.This class defines four categories of operations upon short buffers:
Absolute and relative
get
andput
methods that read and write single shorts;Relative
bulk get
methods that transfer contiguous sequences of shorts from this buffer into an array; andRelative
bulk put
methods that transfer contiguous sequences of shorts from a short array or some other short buffer into this buffer; andA method for
compacting
a short buffer.
Short buffers can be created either by
allocation
, which allocates space for the buffer's content, bywrapping
an existing short array into a buffer, or by creating a view of an existing byte buffer.Like a byte buffer, a short buffer is either direct or non-direct. A short buffer created via the
wrap
methods of this class will be non-direct. A short buffer created as a view of a byte buffer will be direct if, and only if, the byte buffer itself is direct. Whether or not a short buffer is direct may be determined by invoking theisDirect
method.Methods in this class that do not otherwise have a value to return are specified to return the buffer upon which they are invoked. This allows method invocations to be chained.
- Since:
- 1.4
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description static ShortBuffer
allocate(int capacity)
Allocates a new short buffer.short[]
array()
Returns the short array that backs this buffer (optional operation).int
arrayOffset()
Returns the offset within this buffer's backing array of the first element of the buffer (optional operation).abstract ShortBuffer
asReadOnlyBuffer()
Creates a new, read-only short buffer that shares this buffer's content.ShortBuffer
clear()
Clears this buffer.abstract ShortBuffer
compact()
Compacts this buffer (optional operation).int
compareTo(ShortBuffer that)
Compares this buffer to another.abstract ShortBuffer
duplicate()
Creates a new short buffer that shares this buffer's content.boolean
equals(Object ob)
Tells whether or not this buffer is equal to another object.ShortBuffer
flip()
Flips this buffer.abstract short
get()
Relative get method.abstract short
get(int index)
Absolute get method.ShortBuffer
get(short[] dst)
Relative bulk get method.ShortBuffer
get(short[] dst, int offset, int length)
Relative bulk get method.boolean
hasArray()
Tells whether or not this buffer is backed by an accessible short array.int
hashCode()
Returns the current hash code of this buffer.abstract boolean
isDirect()
Tells whether or not this short buffer is direct.ShortBuffer
limit(int newLimit)
Sets this buffer's limit.ShortBuffer
mark()
Sets this buffer's mark at its position.abstract ByteOrder
order()
Retrieves this buffer's byte order.ShortBuffer
position(int newPosition)
Sets this buffer's position.abstract ShortBuffer
put(int index, short s)
Absolute put method (optional operation).abstract ShortBuffer
put(short s)
Relative put method (optional operation).ShortBuffer
put(short[] src)
Relative bulk put method (optional operation).ShortBuffer
put(short[] src, int offset, int length)
Relative bulk put method (optional operation).ShortBuffer
put(ShortBuffer src)
Relative bulk put method (optional operation).ShortBuffer
reset()
Resets this buffer's position to the previously-marked position.ShortBuffer
rewind()
Rewinds this buffer.abstract ShortBuffer
slice()
Creates a new short buffer whose content is a shared subsequence of this buffer's content.String
toString()
Returns a string summarizing the state of this buffer.static ShortBuffer
wrap(short[] array)
Wraps a short array into a buffer.static ShortBuffer
wrap(short[] array, int offset, int length)
Wraps a short array into a buffer.-
Methods inherited from class java.nio.Buffer
capacity, hasRemaining, isReadOnly, limit, position, remaining
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Method Detail
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allocate
public static ShortBuffer allocate(int capacity)
Allocates a new short buffer.The new buffer's position will be zero, its limit will be its capacity, its mark will be undefined, each of its elements will be initialized to zero, and its byte order will be the
native order
of the underlying hardware. It will have abacking array
, and itsarray offset
will be zero.- Parameters:
capacity
- The new buffer's capacity, in shorts- Returns:
- The new short buffer
- Throws:
IllegalArgumentException
- If thecapacity
is a negative integer
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wrap
public static ShortBuffer wrap(short[] array, int offset, int length)
Wraps a short array into a buffer.The new buffer will be backed by the given short array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity will be
array.length
, its position will beoffset
, its limit will beoffset + length
, its mark will be undefined, and its byte order will be thenative order
of the underlying hardware. Itsbacking array
will be the given array, and itsarray offset
will be zero.- Parameters:
array
- The array that will back the new bufferoffset
- The offset of the subarray to be used; must be non-negative and no larger thanarray.length
. The new buffer's position will be set to this value.length
- The length of the subarray to be used; must be non-negative and no larger thanarray.length - offset
. The new buffer's limit will be set tooffset + length
.- Returns:
- The new short buffer
- Throws:
IndexOutOfBoundsException
- If the preconditions on theoffset
andlength
parameters do not hold
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wrap
public static ShortBuffer wrap(short[] array)
Wraps a short array into a buffer.The new buffer will be backed by the given short array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer's capacity and limit will be
array.length
, its position will be zero, its mark will be undefined, and its byte order will be thenative order
of the underlying hardware. Itsbacking array
will be the given array, and itsarray offset
will be zero.- Parameters:
array
- The array that will back this buffer- Returns:
- The new short buffer
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slice
public abstract ShortBuffer slice()
Creates a new short buffer whose content is a shared subsequence of this buffer's content.The content of the new buffer will start at this buffer's current position. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffers' position, limit, and mark values will be independent.
The new buffer's position will be zero, its capacity and its limit will be the number of shorts remaining in this buffer, its mark will be undefined, and its byte order will be identical to that of this buffer. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.
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duplicate
public abstract ShortBuffer duplicate()
Creates a new short buffer that shares this buffer's content.The content of the new buffer will be that of this buffer. Changes to this buffer's content will be visible in the new buffer, and vice versa; the two buffers' position, limit, and mark values will be independent.
The new buffer's capacity, limit, position, mark values, and byte order will be identical to those of this buffer. The new buffer will be direct if, and only if, this buffer is direct, and it will be read-only if, and only if, this buffer is read-only.
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asReadOnlyBuffer
public abstract ShortBuffer asReadOnlyBuffer()
Creates a new, read-only short buffer that shares this buffer's content.The content of the new buffer will be that of this buffer. Changes to this buffer's content will be visible in the new buffer; the new buffer itself, however, will be read-only and will not allow the shared content to be modified. The two buffers' position, limit, and mark values will be independent.
The new buffer's capacity, limit, position, mark values, and byte order will be identical to those of this buffer.
If this buffer is itself read-only then this method behaves in exactly the same way as the
duplicate
method.- Returns:
- The new, read-only short buffer
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get
public abstract short get()
Relative get method. Reads the short at this buffer's current position, and then increments the position.- Returns:
- The short at the buffer's current position
- Throws:
BufferUnderflowException
- If the buffer's current position is not smaller than its limit
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put
public abstract ShortBuffer put(short s)
Relative put method (optional operation).Writes the given short into this buffer at the current position, and then increments the position.
- Parameters:
s
- The short to be written- Returns:
- This buffer
- Throws:
BufferOverflowException
- If this buffer's current position is not smaller than its limitReadOnlyBufferException
- If this buffer is read-only
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get
public abstract short get(int index)
Absolute get method. Reads the short at the given index.- Parameters:
index
- The index from which the short will be read- Returns:
- The short at the given index
- Throws:
IndexOutOfBoundsException
- Ifindex
is negative or not smaller than the buffer's limit
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put
public abstract ShortBuffer put(int index, short s)
Absolute put method (optional operation).Writes the given short into this buffer at the given index.
- Parameters:
index
- The index at which the short will be writtens
- The short value to be written- Returns:
- This buffer
- Throws:
IndexOutOfBoundsException
- Ifindex
is negative or not smaller than the buffer's limitReadOnlyBufferException
- If this buffer is read-only
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get
public ShortBuffer get(short[] dst, int offset, int length)
Relative bulk get method.This method transfers shorts from this buffer into the given destination array. If there are fewer shorts remaining in the buffer than are required to satisfy the request, that is, if
length
>
remaining()
, then no shorts are transferred and aBufferUnderflowException
is thrown.Otherwise, this method copies
length
shorts from this buffer into the given array, starting at the current position of this buffer and at the given offset in the array. The position of this buffer is then incremented bylength
.In other words, an invocation of this method of the form
src.get(dst, off, len)
has exactly the same effect as the loop
except that it first checks that there are sufficient shorts in this buffer and it is potentially much more efficient.for (int i = off; i < off + len; i++) dst[i] = src.get():
- Parameters:
dst
- The array into which shorts are to be writtenoffset
- The offset within the array of the first short to be written; must be non-negative and no larger thandst.length
length
- The maximum number of shorts to be written to the given array; must be non-negative and no larger thandst.length - offset
- Returns:
- This buffer
- Throws:
BufferUnderflowException
- If there are fewer thanlength
shorts remaining in this bufferIndexOutOfBoundsException
- If the preconditions on theoffset
andlength
parameters do not hold
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get
public ShortBuffer get(short[] dst)
Relative bulk get method.This method transfers shorts from this buffer into the given destination array. An invocation of this method of the form
src.get(a)
behaves in exactly the same way as the invocationsrc.get(a, 0, a.length)
- Parameters:
dst
- The destination array- Returns:
- This buffer
- Throws:
BufferUnderflowException
- If there are fewer thanlength
shorts remaining in this buffer
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put
public ShortBuffer put(ShortBuffer src)
Relative bulk put method (optional operation).This method transfers the shorts remaining in the given source buffer into this buffer. If there are more shorts remaining in the source buffer than in this buffer, that is, if
src.remaining()
>
remaining()
, then no shorts are transferred and aBufferOverflowException
is thrown.Otherwise, this method copies n =
src.remaining()
shorts from the given buffer into this buffer, starting at each buffer's current position. The positions of both buffers are then incremented by n.In other words, an invocation of this method of the form
dst.put(src)
has exactly the same effect as the loopwhile (src.hasRemaining()) dst.put(src.get());
except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient.- Parameters:
src
- The source buffer from which shorts are to be read; must not be this buffer- Returns:
- This buffer
- Throws:
BufferOverflowException
- If there is insufficient space in this buffer for the remaining shorts in the source bufferIllegalArgumentException
- If the source buffer is this bufferReadOnlyBufferException
- If this buffer is read-only
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put
public ShortBuffer put(short[] src, int offset, int length)
Relative bulk put method (optional operation).This method transfers shorts into this buffer from the given source array. If there are more shorts to be copied from the array than remain in this buffer, that is, if
length
>
remaining()
, then no shorts are transferred and aBufferOverflowException
is thrown.Otherwise, this method copies
length
shorts from the given array into this buffer, starting at the given offset in the array and at the current position of this buffer. The position of this buffer is then incremented bylength
.In other words, an invocation of this method of the form
dst.put(src, off, len)
has exactly the same effect as the loop
except that it first checks that there is sufficient space in this buffer and it is potentially much more efficient.for (int i = off; i < off + len; i++) dst.put(a[i]);
- Parameters:
src
- The array from which shorts are to be readoffset
- The offset within the array of the first short to be read; must be non-negative and no larger thanarray.length
length
- The number of shorts to be read from the given array; must be non-negative and no larger thanarray.length - offset
- Returns:
- This buffer
- Throws:
BufferOverflowException
- If there is insufficient space in this bufferIndexOutOfBoundsException
- If the preconditions on theoffset
andlength
parameters do not holdReadOnlyBufferException
- If this buffer is read-only
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put
public final ShortBuffer put(short[] src)
Relative bulk put method (optional operation).This method transfers the entire content of the given source short array into this buffer. An invocation of this method of the form
dst.put(a)
behaves in exactly the same way as the invocationdst.put(a, 0, a.length)
- Parameters:
src
- The source array- Returns:
- This buffer
- Throws:
BufferOverflowException
- If there is insufficient space in this bufferReadOnlyBufferException
- If this buffer is read-only
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hasArray
public final boolean hasArray()
Tells whether or not this buffer is backed by an accessible short array.If this method returns
true
then thearray
andarrayOffset
methods may safely be invoked.
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array
public final short[] array()
Returns the short array that backs this buffer (optional operation).Modifications to this buffer's content will cause the returned array's content to be modified, and vice versa.
Invoke the
hasArray
method before invoking this method in order to ensure that this buffer has an accessible backing array.- Specified by:
array
in classBuffer
- Returns:
- The array that backs this buffer
- Throws:
ReadOnlyBufferException
- If this buffer is backed by an array but is read-onlyUnsupportedOperationException
- If this buffer is not backed by an accessible array
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arrayOffset
public final int arrayOffset()
Returns the offset within this buffer's backing array of the first element of the buffer (optional operation).If this buffer is backed by an array then buffer position p corresponds to array index p +
arrayOffset()
.Invoke the
hasArray
method before invoking this method in order to ensure that this buffer has an accessible backing array.- Specified by:
arrayOffset
in classBuffer
- Returns:
- The offset within this buffer's array of the first element of the buffer
- Throws:
ReadOnlyBufferException
- If this buffer is backed by an array but is read-onlyUnsupportedOperationException
- If this buffer is not backed by an accessible array
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position
public final ShortBuffer position(int newPosition)
Sets this buffer's position. If the mark is defined and larger than the new position then it is discarded.
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limit
public final ShortBuffer limit(int newLimit)
Sets this buffer's limit. If the position is larger than the new limit then it is set to the new limit. If the mark is defined and larger than the new limit then it is discarded.
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mark
public final ShortBuffer mark()
Sets this buffer's mark at its position.
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reset
public final ShortBuffer reset()
Resets this buffer's position to the previously-marked position.Invoking this method neither changes nor discards the mark's value.
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clear
public final ShortBuffer clear()
Clears this buffer. The position is set to zero, the limit is set to the capacity, and the mark is discarded.Invoke this method before using a sequence of channel-read or put operations to fill this buffer. For example:
buf.clear(); // Prepare buffer for reading in.read(buf); // Read data
This method does not actually erase the data in the buffer, but it is named as if it did because it will most often be used in situations in which that might as well be the case.
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flip
public final ShortBuffer flip()
Flips this buffer. The limit is set to the current position and then the position is set to zero. If the mark is defined then it is discarded.After a sequence of channel-read or put operations, invoke this method to prepare for a sequence of channel-write or relative get operations. For example:
buf.put(magic); // Prepend header in.read(buf); // Read data into rest of buffer buf.flip(); // Flip buffer out.write(buf); // Write header + data to channel
This method is often used in conjunction with the
compact
method when transferring data from one place to another.
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rewind
public final ShortBuffer rewind()
Rewinds this buffer. The position is set to zero and the mark is discarded.Invoke this method before a sequence of channel-write or get operations, assuming that the limit has already been set appropriately. For example:
out.write(buf); // Write remaining data buf.rewind(); // Rewind buffer buf.get(array); // Copy data into array
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compact
public abstract ShortBuffer compact()
Compacts this buffer (optional operation).The shorts between the buffer's current position and its limit, if any, are copied to the beginning of the buffer. That is, the short at index p =
position()
is copied to index zero, the short at index p + 1 is copied to index one, and so forth until the short at indexlimit()
- 1 is copied to index n =limit()
-1
- p. The buffer's position is then set to n+1 and its limit is set to its capacity. The mark, if defined, is discarded.The buffer's position is set to the number of shorts copied, rather than to zero, so that an invocation of this method can be followed immediately by an invocation of another relative put method.
- Returns:
- This buffer
- Throws:
ReadOnlyBufferException
- If this buffer is read-only
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isDirect
public abstract boolean isDirect()
Tells whether or not this short buffer is direct.
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toString
public String toString()
Returns a string summarizing the state of this buffer.
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hashCode
public int hashCode()
Returns the current hash code of this buffer.The hash code of a short buffer depends only upon its remaining elements; that is, upon the elements from
position()
up to, and including, the element atlimit()
-1
.Because buffer hash codes are content-dependent, it is inadvisable to use buffers as keys in hash maps or similar data structures unless it is known that their contents will not change.
- Overrides:
hashCode
in classObject
- Returns:
- The current hash code of this buffer
- See Also:
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)
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equals
public boolean equals(Object ob)
Tells whether or not this buffer is equal to another object.Two short buffers are equal if, and only if,
They have the same element type,
They have the same number of remaining elements, and
The two sequences of remaining elements, considered independently of their starting positions, are pointwise equal.
A short buffer is not equal to any other type of object.
- Overrides:
equals
in classObject
- Parameters:
ob
- The object to which this buffer is to be compared- Returns:
true
if, and only if, this buffer is equal to the given object- See Also:
Object.hashCode()
,HashMap
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compareTo
public int compareTo(ShortBuffer that)
Compares this buffer to another.Two short buffers are compared by comparing their sequences of remaining elements lexicographically, without regard to the starting position of each sequence within its corresponding buffer. Pairs of
short
elements are compared as if by invokingShort.compare(short,short)
.A short buffer is not comparable to any other type of object.
- Specified by:
compareTo
in interfaceComparable<ShortBuffer>
- Parameters:
that
- the object to be compared.- Returns:
- A negative integer, zero, or a positive integer as this buffer is less than, equal to, or greater than the given buffer
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order
public abstract ByteOrder order()
Retrieves this buffer's byte order.The byte order of a short buffer created by allocation or by wrapping an existing
short
array is thenative order
of the underlying hardware. The byte order of a short buffer created as a view of a byte buffer is that of the byte buffer at the moment that the view is created.- Returns:
- This buffer's byte order
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