This class defines six categories of operations upon * byte buffers: * *
Absolute and relative {@link #get() get} and
* {@link #put(byte) put} methods that read and write
* single bytes;
Relative {@link #get(byte[]) bulk get}
* methods that transfer contiguous sequences of bytes from this buffer
* into an array;
Relative {@link #put(byte[]) bulk put}
* methods that transfer contiguous sequences of bytes from a
* byte array or some other byte
* buffer into this buffer;
Absolute and relative {@link #getChar() get}
* and {@link #putChar(char) put} methods that read and
* write values of other primitive types, translating them to and from
* sequences of bytes in a particular byte order;
Methods for creating view buffers, * which allow a byte buffer to be viewed as a buffer containing values of * some other primitive type; and
Methods for {@link #compact compacting}, {@link
* #duplicate duplicating}, and {@link #slice
* slicing} a byte buffer.
Byte buffers can be created either by {@link #allocate
* allocation A byte buffer is either direct or non-direct. Given a
* direct byte buffer, the Java virtual machine will make a best effort to
* perform native I/O operations directly upon it. That is, it will attempt to
* avoid copying the buffer's content to (or from) an intermediate buffer
* before (or after) each invocation of one of the underlying operating
* system's native I/O operations.
*
* A direct byte buffer may be created by invoking the {@link
* #allocateDirect(int) allocateDirect} factory method of this class. The
* buffers returned by this method typically have somewhat higher allocation
* and deallocation costs than non-direct buffers. The contents of direct
* buffers may reside outside of the normal garbage-collected heap, and so
* their impact upon the memory footprint of an application might not be
* obvious. It is therefore recommended that direct buffers be allocated
* primarily for large, long-lived buffers that are subject to the underlying
* system's native I/O operations. In general it is best to allocate direct
* buffers only when they yield a measureable gain in program performance.
*
* A direct byte buffer may also be created by {@link
* java.nio.channels.FileChannel#map Whether a byte buffer is direct or non-direct may be determined by
* invoking its {@link #isDirect isDirect} method. This method is provided so
* that explicit buffer management can be done in performance-critical code.
*
*
* This class defines methods for reading and writing values of all other
* primitive types, except boolean. Primitive values are translated
* to (or from) sequences of bytes according to the buffer's current byte
* order, which may be retrieved and modified via the {@link #order order}
* methods. Specific byte orders are represented by instances of the {@link
* ByteOrder} class. The initial order of a byte buffer is always {@link
* ByteOrder#BIG_ENDIAN BIG_ENDIAN}.
*
* For access to heterogeneous binary data, that is, sequences of values of
* different types, this class defines a family of absolute and relative
* get and put methods for each type. For 32-bit floating-point
* values, for example, this class defines:
*
* The new buffer's position will be zero, its limit will be its
* capacity, its mark will be undefined, and each of its elements will be
* initialized to zero. It will have a {@link #array
* The new buffer will be backed by the given byte 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 be offset, its limit
* will be offset + length, and its mark will be undefined. Its
* {@link #array }, which allocates space for the buffer's
* content, or by {@link #wrap(byte[]) wrapping} an
* existing byte array into a buffer.
*
*
* mapping Direct vs. non-direct buffers
*
* } a region of a file
* directly into memory. An implementation of the Java platform may optionally
* support the creation of direct byte buffers from native code via JNI. If an
* instance of one of these kinds of buffers refers to an inaccessible region
* of memory then an attempt to access that region will not change the buffer's
* content and will cause an unspecified exception to be thrown either at the
* time of the access or at some later time.
*
* backing array Access to binary data
*
*
*
*
* float {@link #getFloat()}
* float {@link #getFloat(int) getFloat(int index)}
* void {@link #putFloat(float) putFloat(float f)}
* void {@link #putFloat(int, float) putFloat(int index, float f)}} is unspecified.
*
* @param capacity The new buffer's capacity, in bytes
* @return The new byte buffer
* @throws IllegalArgumentException If the capacity is a negative integer
*/
public static ByteBuffer allocateDirect(int capacity) {
if (capacity < 0) {
throw new IllegalArgumentException("capacity < 0: " + capacity);
}
DirectByteBuffer.MemoryRef memoryRef = new DirectByteBuffer.MemoryRef(capacity);
return new DirectByteBuffer(capacity, memoryRef);
}
/**
* Allocates a new byte buffer.
*
* backing array}, and its {@link #arrayOffset array
* offset} will be zero.
*
* @param capacity The new buffer's capacity, in bytes
* @return The new byte buffer
* @throws IllegalArgumentException If the capacity is a negative integer
*/
public static ByteBuffer allocate(int capacity) {
if (capacity < 0)
throw new IllegalArgumentException();
return new HeapByteBuffer(capacity, capacity);
}
/**
* Wraps a byte array into a buffer.
*
* backing array} will be the given array, and
* its {@link #arrayOffset array offset} will be zero.
The new buffer will be backed by the given byte 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, and its mark will be
* undefined. Its {@link #array backing array} will be the
* given array, and its {@link #arrayOffset array offset} will
* be zero.
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 bytes remaining in this buffer, and its mark * will be undefined. 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.
* * @return The new byte buffer */ public abstract ByteBuffer slice(); /** * Creates a new byte 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, and mark values 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.
* * @return The new byte buffer */ public abstract ByteBuffer duplicate(); /** * Creates a new, read-only byte 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, and mark values 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 {@link #duplicate duplicate} method.
* * @return The new, read-only byte buffer */ public abstract ByteBuffer asReadOnlyBuffer(); // -- Singleton get/put methods -- /** * Relative get method. Reads the byte at this buffer's * current position, and then increments the position. * * @return The byte at the buffer's current position * @throws BufferUnderflowException If the buffer's current position is not smaller than its * limit */ public abstract byte get(); /** * Relative put method (optional operation). * *Writes the given byte into this buffer at the current * position, and then increments the position.
* * @param b The byte to be written * @return This buffer * @throws BufferOverflowException If this buffer's current position is not smaller than its * limit * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer put(byte b); /** * Absolute get method. Reads the byte at the given * index. * * @param index The index from which the byte will be read * @return The byte at the given index * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit */ public abstract byte get(int index); /** * Absolute put method (optional operation). * *Writes the given byte into this buffer at the given * index.
* * @param index The index at which the byte will be written * @param b The byte value to be written * @return This buffer * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer put(int index, byte b); // -- Bulk get operations -- /** * Relative bulk get method. * *This method transfers bytes from this buffer into the given * destination array. If there are fewer bytes remaining in the * buffer than are required to satisfy the request, that is, if * length > remaining(), then no * bytes are transferred and a {@link BufferUnderflowException} is * thrown. * *
Otherwise, this method copies length bytes 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 by length. * *
In other words, an invocation of this method of the form * src.get(dst, off, len) has exactly the same effect as * the loop * *
* for (int i = off; i < off + len; i++)
* dst[i] = src.get();
*
* except that it first checks that there are sufficient bytes in
* this buffer and it is potentially much more efficient.
*
* @param dst The array into which bytes are to be written
* @param offset The offset within the array of the first byte to be
* written; must be non-negative and no larger than
* dst.length
* @param length The maximum number of bytes to be written to the given
* array; must be non-negative and no larger than
* dst.length - offset
* @return This buffer
* @throws BufferUnderflowException If there are fewer than length bytes
* remaining in this buffer
* @throws IndexOutOfBoundsException If the preconditions on the offset and
* length
* parameters do not hold
*/
public ByteBuffer get(byte[] dst, int offset, int length) {
checkBounds(offset, length, dst.length);
if (length > remaining())
throw new BufferUnderflowException();
int end = offset + length;
for (int i = offset; i < end; i++)
dst[i] = get();
return this;
}
/**
* Relative bulk get method.
*
* This method transfers bytes 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 invocation * *
* src.get(a, 0, a.length)
*
* @return This buffer
* @throws BufferUnderflowException If there are fewer than length bytes
* remaining in this buffer
*/
public ByteBuffer get(byte[] dst) {
return get(dst, 0, dst.length);
}
// -- Bulk put operations --
/**
* Relative bulk put method (optional operation).
*
* This method transfers the bytes remaining in the given source * buffer into this buffer. If there are more bytes remaining in the * source buffer than in this buffer, that is, if * src.remaining() > remaining(), * then no bytes are transferred and a {@link * BufferOverflowException} is thrown. * *
Otherwise, this method copies * n = src.remaining() bytes 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 loop * *
* while (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.
*
* @param src The source buffer from which bytes are to be read;
* must not be this buffer
* @return This buffer
* @throws BufferOverflowException If there is insufficient space in this buffer
* for the remaining bytes in the source buffer
* @throws IllegalArgumentException If the source buffer is this buffer
* @throws ReadOnlyBufferException If this buffer is read-only
*/
public ByteBuffer put(ByteBuffer src) {
if (!isAccessible()) {
throw new IllegalStateException("buffer is inaccessible");
}
if (isReadOnly) {
throw new ReadOnlyBufferException();
}
if (src == this) {
throw new IllegalArgumentException();
}
int n = src.remaining();
if (n > remaining()) {
throw new BufferOverflowException();
}
// Note that we use offset instead of arrayOffset because arrayOffset is specified to
// throw for read only buffers. Our use of arrayOffset here is provably safe, we only
// use it to read *from* readOnly buffers.
if (this.hb != null && src.hb != null) {
// System.arraycopy is intrinsified by art and therefore tiny bit faster than memmove
System.arraycopy(src.hb, src.position() + src.offset, hb, position() + offset, n);
} else {
// Use the buffer object (and the raw memory address) if it's a direct buffer. Note that
// isDirect() doesn't imply !hasArray(), ByteBuffer.allocateDirect allocated buffer will
// have a backing, non-gc-movable byte array. JNI allocated direct byte buffers WILL NOT
// have a backing array.
final Object srcObject = src.isDirect() ? src : src.array();
int srcOffset = src.position();
if (!src.isDirect()) {
srcOffset += src.offset;
}
final ByteBuffer dst = this;
final Object dstObject = dst.isDirect() ? dst : dst.array();
int dstOffset = dst.position();
if (!dst.isDirect()) {
dstOffset += dst.offset;
}
Memory.memmove(dstObject, dstOffset, srcObject, srcOffset, n);
}
src.position(src.limit());
this.position(this.position() + n);
return this;
}
/**
* Relative bulk put method (optional operation).
*
* This method transfers bytes into this buffer from the given * source array. If there are more bytes to be copied from the array * than remain in this buffer, that is, if * length > remaining(), then no * bytes are transferred and a {@link BufferOverflowException} is * thrown. * *
Otherwise, this method copies length bytes 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 by length. * *
In other words, an invocation of this method of the form * dst.put(src, off, len) has exactly the same effect as * the loop * *
* for (int i = off; i < off + len; i++)
* dst.put(a[i]);
*
* except that it first checks that there is sufficient space in this
* buffer and it is potentially much more efficient.
*
* @param src The array from which bytes are to be read
* @param offset The offset within the array of the first byte to be read;
* must be non-negative and no larger than array.length
* @param length The number of bytes to be read from the given array;
* must be non-negative and no larger than
* array.length - offset
* @return This buffer
* @throws BufferOverflowException If there is insufficient space in this buffer
* @throws IndexOutOfBoundsException If the preconditions on the offset and
* length
* parameters do not hold
* @throws ReadOnlyBufferException If this buffer is read-only
*/
public ByteBuffer put(byte[] src, int offset, int length) {
checkBounds(offset, length, src.length);
if (length > remaining())
throw new BufferOverflowException();
int end = offset + length;
for (int i = offset; i < end; i++)
this.put(src[i]);
return this;
}
/**
* Relative bulk put method (optional operation).
*
* This method transfers the entire content of the given source * byte array into this buffer. An invocation of this method of the * form dst.put(a) behaves in exactly the same way as the * invocation * *
* dst.put(a, 0, a.length)
*
* @return This buffer
* @throws BufferOverflowException If there is insufficient space in this buffer
* @throws ReadOnlyBufferException If this buffer is read-only
*/
public final ByteBuffer put(byte[] src) {
return put(src, 0, src.length);
}
// -- Other stuff --
/**
* Tells whether or not this buffer is backed by an accessible byte
* array.
*
* If this method returns true then the {@link #array() array} * and {@link #arrayOffset() arrayOffset} methods may safely be invoked. *
* * @return true if, and only if, this buffer * is backed by an array and is not read-only */ public final boolean hasArray() { return (hb != null) && !isReadOnly(); } /** * Returns the byte 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 {@link #hasArray hasArray} method before invoking this * method in order to ensure that this buffer has an accessible backing * array.
* * @return The array that backs this buffer * @throws ReadOnlyBufferException If this buffer is backed by an array but is read-only * @throws UnsupportedOperationException If this buffer is not backed by an accessible array */ public final byte[] array() { if (hb == null) throw new UnsupportedOperationException(); if (isReadOnly) throw new ReadOnlyBufferException(); return hb; } /** * 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 {@link #hasArray hasArray} method before invoking this * method in order to ensure that this buffer has an accessible backing * array.
* * @return 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-only * @throws UnsupportedOperationException If this buffer is not backed by an accessible array */ public final int arrayOffset() { if (hb == null) throw new UnsupportedOperationException(); if (isReadOnly) throw new ReadOnlyBufferException(); return offset; } /** * Compacts this buffer (optional operation). * *The bytes between the buffer's current position and its limit, * if any, are copied to the beginning of the buffer. That is, the * byte at index p = position() is copied * to index zero, the byte at index p + 1 is copied * to index one, and so forth until the byte at index * limit() - 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 bytes copied, * rather than to zero, so that an invocation of this method can be * followed immediately by an invocation of another relative put * method.
* * * *Invoke this method after writing data from a buffer in case the * write was incomplete. The following loop, for example, copies bytes * from one channel to another via the buffer buf: * *
* buf.clear(); // Prepare buffer for use
* while (in.read(buf) >= 0 || buf.position != 0) {
* buf.flip();
* out.write(buf);
* buf.compact(); // In case of partial write
* }The hash code of a byte buffer depends only upon its remaining * elements; that is, upon the elements from position() up to, and * including, the element at limit() - 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.
* * @return The current hash code of this buffer */ public int hashCode() { int h = 1; int p = position(); for (int i = limit() - 1; i >= p; i--) h = 31 * h + (int) get(i); return h; } /** * Tells whether or not this buffer is equal to another object. * *Two byte 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 byte buffer is not equal to any other type of object.
* * @param ob The object to which this buffer is to be compared * @return true if, and only if, this buffer is equal to the * given object */ public boolean equals(Object ob) { if (this == ob) return true; if (!(ob instanceof ByteBuffer)) return false; ByteBuffer that = (ByteBuffer) ob; if (this.remaining() != that.remaining()) return false; int p = this.position(); for (int i = this.limit() - 1, j = that.limit() - 1; i >= p; i--, j--) if (!equals(this.get(i), that.get(j))) return false; return true; } private static boolean equals(byte x, byte y) { return x == y; } /** * Compares this buffer to another. * *Two byte 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 {@code byte} elements are compared as if by invoking * {@link Byte#compare(byte, byte)}. * * *
A byte buffer is not comparable to any other type of object. * * @return A negative integer, zero, or a positive integer as this buffer * is less than, equal to, or greater than the given buffer */ public int compareTo(ByteBuffer that) { int n = this.position() + Math.min(this.remaining(), that.remaining()); for (int i = this.position(), j = that.position(); i < n; i++, j++) { int cmp = compare(this.get(i), that.get(j)); if (cmp != 0) return cmp; } return this.remaining() - that.remaining(); } private static int compare(byte x, byte y) { return Byte.compare(x, y); } // -- Other char stuff -- // -- Other byte stuff: Access to binary data -- boolean bigEndian // package-private = true; boolean nativeByteOrder // package-private = (Bits.byteOrder() == ByteOrder.BIG_ENDIAN); /** * Retrieves this buffer's byte order. * *
The byte order is used when reading or writing multibyte values, and * when creating buffers that are views of this byte buffer. The order of * a newly-created byte buffer is always {@link ByteOrder#BIG_ENDIAN * BIG_ENDIAN}.
* * @return This buffer's byte order */ public final ByteOrder order() { return bigEndian ? ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN; } /** * Modifies this buffer's byte order. * * @param bo The new byte order, * either {@link ByteOrder#BIG_ENDIAN BIG_ENDIAN} * or {@link ByteOrder#LITTLE_ENDIAN LITTLE_ENDIAN} * @return This buffer */ public final ByteBuffer order(ByteOrder bo) { bigEndian = (bo == ByteOrder.BIG_ENDIAN); nativeByteOrder = (bigEndian == (Bits.byteOrder() == ByteOrder.BIG_ENDIAN)); return this; } // Unchecked accessors, for use by ByteBufferAs-X-Buffer classes // abstract byte _get(int i); // package-private abstract void _put(int i, byte b); // package-private /** * Relative get method for reading a char value. * *Reads the next two bytes at this buffer's current position, * composing them into a char value according to the current byte order, * and then increments the position by two.
* * @return The char value at the buffer's current position * @throws BufferUnderflowException If there are fewer than two bytes * remaining in this buffer */ public abstract char getChar(); /** * Relative put method for writing a char * value (optional operation). * *Writes two bytes containing the given char value, in the * current byte order, into this buffer at the current position, and then * increments the position by two.
* * @param value The char value to be written * @return This buffer * @throws BufferOverflowException If there are fewer than two bytes * remaining in this buffer * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putChar(char value); /** * Absolute get method for reading a char value. * *Reads two bytes at the given index, composing them into a * char value according to the current byte order.
* * @param index The index from which the bytes will be read * @return The char value at the given index * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus one */ public abstract char getChar(int index); char getCharUnchecked(int index) { throw new UnsupportedOperationException(); } void getUnchecked(int pos, char[] dst, int dstOffset, int length) { throw new UnsupportedOperationException(); } /** * Absolute put method for writing a char * value (optional operation). * *Writes two bytes containing the given char value, in the * current byte order, into this buffer at the given index.
* * @param index The index at which the bytes will be written * @param value The char value to be written * @return This buffer * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus one * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putChar(int index, char value); void putCharUnchecked(int index, char value) { throw new UnsupportedOperationException(); } void putUnchecked(int pos, char[] dst, int srcOffset, int length) { throw new UnsupportedOperationException(); } /** * Creates a view of this byte buffer as a char buffer. * *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 bytes remaining in this buffer divided by * two, and its mark will be undefined. 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.
* * @return A new char buffer */ public abstract CharBuffer asCharBuffer(); /** * Relative get method for reading a short value. * *Reads the next two bytes at this buffer's current position, * composing them into a short value according to the current byte order, * and then increments the position by two.
* * @return The short value at the buffer's current position * @throws BufferUnderflowException If there are fewer than two bytes * remaining in this buffer */ public abstract short getShort(); /** * Relative put method for writing a short * value (optional operation). * *Writes two bytes containing the given short value, in the * current byte order, into this buffer at the current position, and then * increments the position by two.
* * @param value The short value to be written * @return This buffer * @throws BufferOverflowException If there are fewer than two bytes * remaining in this buffer * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putShort(short value); /** * Absolute get method for reading a short value. * *Reads two bytes at the given index, composing them into a * short value according to the current byte order.
* * @param index The index from which the bytes will be read * @return The short value at the given index * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus one */ public abstract short getShort(int index); short getShortUnchecked(int index) { throw new UnsupportedOperationException(); } void getUnchecked(int pos, short[] dst, int dstOffset, int length) { throw new UnsupportedOperationException(); } /** * Absolute put method for writing a short * value (optional operation). * *Writes two bytes containing the given short value, in the * current byte order, into this buffer at the given index.
* * @param index The index at which the bytes will be written * @param value The short value to be written * @return This buffer * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus one * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putShort(int index, short value); void putShortUnchecked(int index, short value) { throw new UnsupportedOperationException(); } void putUnchecked(int pos, short[] dst, int srcOffset, int length) { throw new UnsupportedOperationException(); } /** * Creates a view of this byte buffer as a short buffer. * *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 bytes remaining in this buffer divided by * two, and its mark will be undefined. 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.
* * @return A new short buffer */ public abstract ShortBuffer asShortBuffer(); /** * Relative get method for reading an int value. * *Reads the next four bytes at this buffer's current position, * composing them into an int value according to the current byte order, * and then increments the position by four.
* * @return The int value at the buffer's current position * @throws BufferUnderflowException If there are fewer than four bytes * remaining in this buffer */ public abstract int getInt(); /** * Relative put method for writing an int * value (optional operation). * *Writes four bytes containing the given int value, in the * current byte order, into this buffer at the current position, and then * increments the position by four.
* * @param value The int value to be written * @return This buffer * @throws BufferOverflowException If there are fewer than four bytes * remaining in this buffer * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putInt(int value); /** * Absolute get method for reading an int value. * *Reads four bytes at the given index, composing them into a * int value according to the current byte order.
* * @param index The index from which the bytes will be read * @return The int value at the given index * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus three */ public abstract int getInt(int index); int getIntUnchecked(int index) { throw new UnsupportedOperationException(); } void getUnchecked(int pos, int[] dst, int dstOffset, int length) { throw new UnsupportedOperationException(); } /** * Absolute put method for writing an int * value (optional operation). * *Writes four bytes containing the given int value, in the * current byte order, into this buffer at the given index.
* * @param index The index at which the bytes will be written * @param value The int value to be written * @return This buffer * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus three * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putInt(int index, int value); void putIntUnchecked(int index, int value) { throw new UnsupportedOperationException(); } void putUnchecked(int pos, int[] dst, int srcOffset, int length) { throw new UnsupportedOperationException(); } /** * Creates a view of this byte buffer as an int buffer. * *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 bytes remaining in this buffer divided by * four, and its mark will be undefined. 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.
* * @return A new int buffer */ public abstract IntBuffer asIntBuffer(); /** * Relative get method for reading a long value. * *Reads the next eight bytes at this buffer's current position, * composing them into a long value according to the current byte order, * and then increments the position by eight.
* * @return The long value at the buffer's current position * @throws BufferUnderflowException If there are fewer than eight bytes * remaining in this buffer */ public abstract long getLong(); /** * Relative put method for writing a long * value (optional operation). * *Writes eight bytes containing the given long value, in the * current byte order, into this buffer at the current position, and then * increments the position by eight.
* * @param value The long value to be written * @return This buffer * @throws BufferOverflowException If there are fewer than eight bytes * remaining in this buffer * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putLong(long value); /** * Absolute get method for reading a long value. * *Reads eight bytes at the given index, composing them into a * long value according to the current byte order.
* * @param index The index from which the bytes will be read * @return The long value at the given index * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus seven */ public abstract long getLong(int index); long getLongUnchecked(int index) { throw new UnsupportedOperationException(); } void getUnchecked(int pos, long[] dst, int dstOffset, int length) { throw new UnsupportedOperationException(); } /** * Absolute put method for writing a long * value (optional operation). * *Writes eight bytes containing the given long value, in the * current byte order, into this buffer at the given index.
* * @param index The index at which the bytes will be written * @param value The long value to be written * @return This buffer * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus seven * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putLong(int index, long value); void putLongUnchecked(int index, long value) { throw new UnsupportedOperationException(); } void putUnchecked(int pos, long[] dst, int srcOffset, int length) { throw new UnsupportedOperationException(); } /** * Creates a view of this byte buffer as a long buffer. * *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 bytes remaining in this buffer divided by * eight, and its mark will be undefined. 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.
* * @return A new long buffer */ public abstract LongBuffer asLongBuffer(); /** * Relative get method for reading a float value. * *Reads the next four bytes at this buffer's current position, * composing them into a float value according to the current byte order, * and then increments the position by four.
* * @return The float value at the buffer's current position * @throws BufferUnderflowException If there are fewer than four bytes * remaining in this buffer */ public abstract float getFloat(); /** * Relative put method for writing a float * value (optional operation). * *Writes four bytes containing the given float value, in the * current byte order, into this buffer at the current position, and then * increments the position by four.
* * @param value The float value to be written * @return This buffer * @throws BufferOverflowException If there are fewer than four bytes * remaining in this buffer * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putFloat(float value); /** * Absolute get method for reading a float value. * *Reads four bytes at the given index, composing them into a * float value according to the current byte order.
* * @param index The index from which the bytes will be read * @return The float value at the given index * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus three */ public abstract float getFloat(int index); float getFloatUnchecked(int index) { throw new UnsupportedOperationException(); } void getUnchecked(int pos, float[] dst, int dstOffset, int length) { throw new UnsupportedOperationException(); } /** * Absolute put method for writing a float * value (optional operation). * *Writes four bytes containing the given float value, in the * current byte order, into this buffer at the given index.
* * @param index The index at which the bytes will be written * @param value The float value to be written * @return This buffer * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus three * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putFloat(int index, float value); void putFloatUnchecked(int index, float value) { throw new UnsupportedOperationException(); } void putUnchecked(int pos, float[] dst, int srcOffset, int length) { throw new UnsupportedOperationException(); } /** * Creates a view of this byte buffer as a float buffer. * *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 bytes remaining in this buffer divided by * four, and its mark will be undefined. 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.
* * @return A new float buffer */ public abstract FloatBuffer asFloatBuffer(); /** * Relative get method for reading a double value. * *Reads the next eight bytes at this buffer's current position, * composing them into a double value according to the current byte order, * and then increments the position by eight.
* * @return The double value at the buffer's current position * @throws BufferUnderflowException If there are fewer than eight bytes * remaining in this buffer */ public abstract double getDouble(); /** * Relative put method for writing a double * value (optional operation). * *Writes eight bytes containing the given double value, in the * current byte order, into this buffer at the current position, and then * increments the position by eight.
* * @param value The double value to be written * @return This buffer * @throws BufferOverflowException If there are fewer than eight bytes * remaining in this buffer * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putDouble(double value); /** * Absolute get method for reading a double value. * *Reads eight bytes at the given index, composing them into a * double value according to the current byte order.
* * @param index The index from which the bytes will be read * @return The double value at the given index * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus seven */ public abstract double getDouble(int index); double getDoubleUnchecked(int index) { throw new UnsupportedOperationException(); } void getUnchecked(int pos, double[] dst, int dstOffset, int length) { throw new UnsupportedOperationException(); } /** * Absolute put method for writing a double * value (optional operation). * *Writes eight bytes containing the given double value, in the * current byte order, into this buffer at the given index.
* * @param index The index at which the bytes will be written * @param value The double value to be written * @return This buffer * @throws IndexOutOfBoundsException If index is negative * or not smaller than the buffer's limit, * minus seven * @throws ReadOnlyBufferException If this buffer is read-only */ public abstract ByteBuffer putDouble(int index, double value); void putDoubleUnchecked(int index, double value) { throw new UnsupportedOperationException(); } void putUnchecked(int pos, double[] dst, int srcOffset, int length) { throw new UnsupportedOperationException(); } /** * Creates a view of this byte buffer as a double buffer. * *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 bytes remaining in this buffer divided by * eight, and its mark will be undefined. 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.
* * @return A new double buffer */ public abstract DoubleBuffer asDoubleBuffer(); /** * @hide */ public boolean isAccessible() { return true; } /** * @hide */ public void setAccessible(boolean value) { throw new UnsupportedOperationException(); } }