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package javax.imageio.stream;
A class representing a mutable reference to an array of bytes and
an offset and length within that array. IIOByteBuffer
is used by ImageInputStream to supply a sequence of bytes
to the caller, possibly with fewer copies than using the conventional
read methods that take a user-supplied byte array.
The byte array referenced by an IIOByteBuffer will
generally be part of an internal data structure belonging to an
ImageReader implementation; its contents should be
considered read-only and must not be modified.
/**
* A class representing a mutable reference to an array of bytes and
* an offset and length within that array. <code>IIOByteBuffer</code>
* is used by <code>ImageInputStream</code> to supply a sequence of bytes
* to the caller, possibly with fewer copies than using the conventional
* <code>read</code> methods that take a user-supplied byte array.
*
* <p> The byte array referenced by an <code>IIOByteBuffer</code> will
* generally be part of an internal data structure belonging to an
* <code>ImageReader</code> implementation; its contents should be
* considered read-only and must not be modified.
*
*/
public class IIOByteBuffer {
private byte[] data;
private int offset;
private int length;
Constructs an IIOByteBuffer that references a
given byte array, offset, and length.
Params: - data – a byte array.
- offset – an int offset within the array.
- length – an int specifying the length of the data of
interest within byte array, in bytes.
/**
* Constructs an <code>IIOByteBuffer</code> that references a
* given byte array, offset, and length.
*
* @param data a byte array.
* @param offset an int offset within the array.
* @param length an int specifying the length of the data of
* interest within byte array, in bytes.
*/
public IIOByteBuffer(byte[] data, int offset, int length) {
this.data = data;
this.offset = offset;
this.length = length;
}
Returns a reference to the byte array. The returned value should
be treated as read-only, and only the portion specified by the
values of getOffset and getLength should
be used.
See Also: Returns: a byte array reference.
/**
* Returns a reference to the byte array. The returned value should
* be treated as read-only, and only the portion specified by the
* values of <code>getOffset</code> and <code>getLength</code> should
* be used.
*
* @return a byte array reference.
*
* @see #getOffset
* @see #getLength
* @see #setData
*/
public byte[] getData() {
return data;
}
Updates the array reference that will be returned by subsequent calls
to the getData method.
Params: - data – a byte array reference containing the new data value.
See Also:
/**
* Updates the array reference that will be returned by subsequent calls
* to the <code>getData</code> method.
*
* @param data a byte array reference containing the new data value.
*
* @see #getData
*/
public void setData(byte[] data) {
this.data = data;
}
Returns the offset within the byte array returned by
getData at which the data of interest start.
See Also: Returns: an int offset.
/**
* Returns the offset within the byte array returned by
* <code>getData</code> at which the data of interest start.
*
* @return an int offset.
*
* @see #getData
* @see #getLength
* @see #setOffset
*/
public int getOffset() {
return offset;
}
Updates the value that will be returned by subsequent calls
to the getOffset method.
Params: - offset – an int containing the new offset value.
See Also:
/**
* Updates the value that will be returned by subsequent calls
* to the <code>getOffset</code> method.
*
* @param offset an int containing the new offset value.
*
* @see #getOffset
*/
public void setOffset(int offset) {
this.offset = offset;
}
Returns the length of the data of interest within the byte
array returned by getData.
See Also: Returns: an int length.
/**
* Returns the length of the data of interest within the byte
* array returned by <code>getData</code>.
*
* @return an int length.
*
* @see #getData
* @see #getOffset
* @see #setLength
*/
public int getLength() {
return length;
}
Updates the value that will be returned by subsequent calls
to the getLength method.
Params: - length – an int containing the new length value.
See Also:
/**
* Updates the value that will be returned by subsequent calls
* to the <code>getLength</code> method.
*
* @param length an int containing the new length value.
*
* @see #getLength
*/
public void setLength(int length) {
this.length = length;
}
}