Android
java.nio
public abstract class

java.nio.ByteBuffer

java.lang.Object
java.nio.Buffer
java.nio.ByteBuffer Comparable<T>

A buffer of bytes.

A byte buffer can be created in either of the following ways:

  • Allocate a new byte array and create a buffer based on it;
  • Allocate a memory block and create a direct buffer based on it;
  • Wrap an existing byte array to create a new buffer.

Known Direct Subclasses

Summary

Public Methods

      static    ByteBuffer  allocate(int capacity)
Creates a byte buffer based on a new allocated byte array.
      static    ByteBuffer  allocateDirect(int capacity)
Creates a direct byte buffer based on a new allocated memory block.
    final      byte[]  array()
Returns the byte array which this buffer is based on, if there's one.
    final      int  arrayOffset()
Returns the offset of the byte array which this buffer is based on, if there's one.
abstract          CharBuffer  asCharBuffer()
Returns a char buffer which is based on the remaining content of this byte buffer.
abstract          DoubleBuffer  asDoubleBuffer()
Returns a double buffer which is based on the remaining content of this byte buffer.
abstract          FloatBuffer  asFloatBuffer()
Returns a float buffer which is based on the remaining content of this byte buffer.
abstract          IntBuffer  asIntBuffer()
Returns a int buffer which is based on the remaining content of this byte buffer.
abstract          LongBuffer  asLongBuffer()
Returns a long buffer which is based on the remaining content of this byte buffer.
abstract          ByteBuffer  asReadOnlyBuffer()
Returns a readonly buffer that shares content with this buffer.
abstract          ShortBuffer  asShortBuffer()
Returns a short buffer which is based on the remaining content of this byte buffer.
abstract          ByteBuffer  compact()
Compacts this byte buffer.
          int  compareTo(ByteBuffer otherBuffer)
Compare the remaining bytes of this buffer to another byte buffer's remaining bytes.
abstract          ByteBuffer  duplicate()
Returns a duplicated buffer that shares content with this buffer.
          boolean  equals(Object other)
Tests whether this byte buffer equals to another object.
abstract          byte  get()
Returns the byte at the current position and increase the position by 1.
          ByteBuffer  get(byte[] dest, int off, int len)
Reads bytes from the current position into the specified byte array, starting from the specified offset, and increase the position by the number of bytes read.
          ByteBuffer  get(byte[] dest)
Reads bytes from the current position into the specified byte array and increase the position by the number of bytes read.
abstract          byte  get(int index)
Returns a byte at the specified index, and the position is not changed.
abstract          char  getChar(int index)
Returns the char at the specified index.
abstract          char  getChar()
Returns the char at the current position and increase the position by 2.
abstract          double  getDouble()
Returns the double at the current position and increase the position by 8.
abstract          double  getDouble(int index)
Returns the double at the specified index.
abstract          float  getFloat()
Returns the float at the current position and increase the position by 4.
abstract          float  getFloat(int index)
Returns the float at the specified index.
abstract          int  getInt(int index)
Returns the int at the specified index.
abstract          int  getInt()
Returns the int at the current position and increase the position by 4.
abstract          long  getLong()
Returns the long at the current position and increase the position by 8.
abstract          long  getLong(int index)
Returns the long at the specified index.
abstract          short  getShort(int index)
Returns the short at the specified index.
abstract          short  getShort()
Returns the short at the current position and increase the position by 2.
    final      boolean  hasArray()
Returns whether this buffer is based on a byte array and is read/write.
          int  hashCode()
Hash code is calculated from the remaining bytes.
abstract          boolean  isDirect()
Returns true if this buffer is direct.
    final      ByteOrder  order()
Returns the byte order used by this buffer when converting bytes from/to other primitive types.
    final      ByteBuffer  order(ByteOrder byteOrder)
Sets the byte order of this buffer.
    final      ByteBuffer  put(byte[] src)
Writes bytes in the given byte array to the current position and increase the position by the number of bytes written.
abstract          ByteBuffer  put(byte b)
Writes the given byte to the current position and increase the position by 1.
abstract          ByteBuffer  put(int index, byte b)
Write a byte to the specified index of this buffer and the position is not changed.
          ByteBuffer  put(ByteBuffer src)
Writes all the remaining bytes of the src byte buffer to this buffer's current position, and increase both buffers' position by the number of bytes copied.
          ByteBuffer  put(byte[] src, int off, int len)
Writes bytes in the given byte array, starting from the specified offset, to the current position and increase the position by the number of bytes written.
abstract          ByteBuffer  putChar(int index, char value)
Write a char to the specified index of this buffer.
abstract          ByteBuffer  putChar(char value)
Writes the given char to the current position and increase the position by 2.
abstract          ByteBuffer  putDouble(int index, double value)
Write a double to the specified index of this buffer.
abstract          ByteBuffer  putDouble(double value)
Writes the given double to the current position and increase the position by 8.
abstract          ByteBuffer  putFloat(int index, float value)
Write a float to the specified index of this buffer.
abstract          ByteBuffer  putFloat(float value)
Writes the given float to the current position and increase the position by 4.
abstract          ByteBuffer  putInt(int value)
Writes the given int to the current position and increase the position by 4.
abstract          ByteBuffer  putInt(int index, int value)
Write a int to the specified index of this buffer.
abstract          ByteBuffer  putLong(long value)
Writes the given long to the current position and increase the position by 8.
abstract          ByteBuffer  putLong(int index, long value)
Write a long to the specified index of this buffer.
abstract          ByteBuffer  putShort(int index, short value)
Write a short to the specified index of this buffer.
abstract          ByteBuffer  putShort(short value)
Writes the given short to the current position and increase the position by 2.
abstract          ByteBuffer  slice()
Returns a sliced buffer that shares content with this buffer.
          String  toString()
Returns a string represents the state of this byte buffer.
      static    ByteBuffer  wrap(byte[] array)
Creates a new byte buffer by wrapping the given byte array.
      static    ByteBuffer  wrap(byte[] array, int start, int len)
Creates new a byte buffer by wrapping the given byte array.
Methods inherited from class java.nio.Buffer
Methods inherited from class java.lang.Object
Methods inherited from interface java.lang.Comparable

Details

Public Methods

public static ByteBuffer allocate(int capacity)

Creates a byte buffer based on a new allocated byte array.

Parameters

capacity The capacity of the new buffer

Returns

  • The created byte buffer

Throws

IllegalArgumentException If capacity is less than zero

public static ByteBuffer allocateDirect(int capacity)

Creates a direct byte buffer based on a new allocated memory block.

Parameters

capacity The capacity of the new buffer

Returns

  • The created byte buffer

Throws

IllegalArgumentException If capacity is less than zero

public final byte[] array()

Returns the byte array which this buffer is based on, if there's one.

Returns

  • The byte array which this buffer is based on

Throws

ReadOnlyBufferException If this buffer is based on a readonly array
UnsupportedOperationException If this buffer is not based on an array

public final int arrayOffset()

Returns the offset of the byte array which this buffer is based on, if there's one.

The offset is the index of the array corresponds to the zero position of the buffer.

Returns

  • The offset of the byte array which this buffer is based on

Throws

ReadOnlyBufferException If this buffer is based on a readonly array
UnsupportedOperationException If this buffer is not based on an array

public abstract CharBuffer asCharBuffer()

Returns a char buffer which is based on the remaining content of this byte buffer.

The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by two, and its mark is not set. The new buffer's readonly property and byte order are same as this buffer. The new buffer is direct, if this byte buffer is direct.

The new buffer shares content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.

Returns

  • A char buffer which is based on the content of this byte buffer.

public abstract DoubleBuffer asDoubleBuffer()

Returns a double buffer which is based on the remaining content of this byte buffer.

The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by two, and its mark is not set. The new buffer's readonly property and byte order are same as this buffer. The new buffer is direct, if this byte buffer is direct.

The new buffer shares content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.

Returns

  • A double buffer which is based on the content of this byte buffer.

public abstract FloatBuffer asFloatBuffer()

Returns a float buffer which is based on the remaining content of this byte buffer.

The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by two, and its mark is not set. The new buffer's readonly property and byte order are same as this buffer. The new buffer is direct, if this byte buffer is direct.

The new buffer shares content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.

Returns

  • A float buffer which is based on the content of this byte buffer.

public abstract IntBuffer asIntBuffer()

Returns a int buffer which is based on the remaining content of this byte buffer.

The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by two, and its mark is not set. The new buffer's readonly property and byte order are same as this buffer. The new buffer is direct, if this byte buffer is direct.

The new buffer shares content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.

Returns

  • A int buffer which is based on the content of this byte buffer.

public abstract LongBuffer asLongBuffer()

Returns a long buffer which is based on the remaining content of this byte buffer.

The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by two, and its mark is not set. The new buffer's readonly property and byte order are same as this buffer. The new buffer is direct, if this byte buffer is direct.

The new buffer shares content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.

Returns

  • A long buffer which is based on the content of this byte buffer.

public abstract ByteBuffer asReadOnlyBuffer()

Returns a readonly buffer that shares content with this buffer.

The returned buffer is guaranteed to be a new instance, even this buffer is readonly itself. The new buffer's position, limit, capacity and mark are the same as this buffer.

The new buffer shares content with this buffer, which means this buffer's change of content will be visible to the new buffer. The two buffer's position, limit and mark are independent.

Returns

  • A readonly version of this buffer.

public abstract ShortBuffer asShortBuffer()

Returns a short buffer which is based on the remaining content of this byte buffer.

The new buffer's position is zero, its limit and capacity is the number of remaining bytes divided by two, and its mark is not set. The new buffer's readonly property and byte order are same as this buffer. The new buffer is direct, if this byte buffer is direct.

The new buffer shares content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.

Returns

  • A short buffer which is based on the content of this byte buffer.

public abstract ByteBuffer compact()

Compacts this byte buffer.

The remaining bytes will be moved to the head of the buffer, staring from position zero. Then the position is set to remaining(); the limit is set to capacity; the mark is cleared.

Returns

  • This buffer

Throws

ReadOnlyBufferException If no changes may be made to the contents of this buffer

public int compareTo(ByteBuffer otherBuffer)

Compare the remaining bytes of this buffer to another byte buffer's remaining bytes.

Parameters

otherBuffer Another byte buffer

Returns

  • a negative value if this is less than other; 0 if this equals to other; a positive value if this is greater than other

Throws

ClassCastException If other is not a byte buffer

public abstract ByteBuffer duplicate()

Returns a duplicated buffer that shares content with this buffer.

The duplicated buffer's position, limit, capacity and mark are the same as this buffer. The duplicated buffer's readonly property and byte order are same as this buffer too.

The new buffer shares content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.

Returns

  • A duplicated buffer that shares content with this buffer.

public boolean equals(Object other)

Tests whether this byte buffer equals to another object.

If other is not a byte buffer, then false is returned.

Two byte buffers are equals if, and only if, their remaining bytes are exactly the same. Position, limit, capacity and mark are not considered.

Parameters

other the object to compare against

Returns

  • Whether this byte buffer equals to another object.

public abstract byte get()

Returns the byte at the current position and increase the position by 1.

Returns

  • The byte at the current position.

Throws

BufferUnderflowException If the position is equal or greater than limit

public ByteBuffer get(byte[] dest, int off, int len)

Reads bytes from the current position into the specified byte array, starting from the specified offset, and increase the position by the number of bytes read.

Parameters

dest The target byte array
off The offset of the byte array, must be no less than zero and no greater than dest.length
len The number of bytes to read, must be no less than zero and no greater than dest.length - off

Returns

  • This buffer

Throws

IndexOutOfBoundsException If either off or len is invalid
BufferUnderflowException If len is greater than remaining()

public ByteBuffer get(byte[] dest)

Reads bytes from the current position into the specified byte array and increase the position by the number of bytes read.

Calling this method has the same effect as get(dest, 0, dest.length).

Parameters

dest The destination byte array

Returns

  • This buffer

Throws

BufferUnderflowException if dest.length is greater than remaining()

public abstract byte get(int index)

Returns a byte at the specified index, and the position is not changed.

Parameters

index The index, must be no less than zero and less than limit

Returns

  • A byte at the specified index.

Throws

IndexOutOfBoundsException If index is invalid

public abstract char getChar(int index)

Returns the char at the specified index.

The 2 bytes start from the specified index are composed into a char according to current byte order and returned. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 2

Returns

  • The char at the specified index.

Throws

IndexOutOfBoundsException If index is invalid

public abstract char getChar()

Returns the char at the current position and increase the position by 2.

The 2 bytes start from the current position are composed into a char according to current byte order and returned. The position increases by 2.

Returns

  • The char at the current position.

Throws

BufferUnderflowException If the position is greater than limit - 2

public abstract double getDouble()

Returns the double at the current position and increase the position by 8.

The 8 bytes start from the current position are composed into a double according to current byte order and returned. The position increases by 8.

Returns

  • The double at the current position.

Throws

BufferUnderflowException If the position is greater than limit - 8

public abstract double getDouble(int index)

Returns the double at the specified index.

The 8 bytes start from the specified index are composed into a double according to current byte order and returned. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 8

Returns

  • The double at the specified index.

Throws

IndexOutOfBoundsException If index is invalid

public abstract float getFloat()

Returns the float at the current position and increase the position by 4.

The 4 bytes start from the current position are composed into a float according to current byte order and returned. The position increases by 4.

Returns

  • The float at the current position.

Throws

BufferUnderflowException If the position is greater than limit - 4

public abstract float getFloat(int index)

Returns the float at the specified index.

The 4 bytes start from the specified index are composed into a float according to current byte order and returned. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 4

Returns

  • The float at the specified index.

Throws

IndexOutOfBoundsException If index is invalid

public abstract int getInt(int index)

Returns the int at the specified index.

The 4 bytes start from the specified index are composed into a int according to current byte order and returned. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 4

Returns

  • The int at the specified index.

Throws

IndexOutOfBoundsException If index is invalid

public abstract int getInt()

Returns the int at the current position and increase the position by 4.

The 4 bytes start from the current position are composed into a int according to current byte order and returned. The position increases by 4.

Returns

  • The int at the current position.

Throws

BufferUnderflowException If the position is greater than limit - 4

public abstract long getLong()

Returns the long at the current position and increase the position by 8.

The 8 bytes start from the current position are composed into a long according to current byte order and returned. The position increases by 8.

Returns

  • The long at the current position.

Throws

BufferUnderflowException If the position is greater than limit - 8

public abstract long getLong(int index)

Returns the long at the specified index.

The 8 bytes start from the specified index are composed into a long according to current byte order and returned. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 8

Returns

  • The long at the specified index.

Throws

IndexOutOfBoundsException If index is invalid

public abstract short getShort(int index)

Returns the short at the specified index.

The 2 bytes start from the specified index are composed into a short according to current byte order and returned. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 2

Returns

  • The short at the specified index.

Throws

IndexOutOfBoundsException If index is invalid

public abstract short getShort()

Returns the short at the current position and increase the position by 2.

The 2 bytes start from the current position are composed into a short according to current byte order and returned. The position increases by 2.

Returns

  • The short at the current position.

Throws

BufferUnderflowException If the position is greater than limit - 2

public final boolean hasArray()

Returns whether this buffer is based on a byte array and is read/write.

If this buffer is readonly, then false is returned.

Returns

  • Whether this buffer is based on a byte array and is read/write.

public int hashCode()

Hash code is calculated from the remaining bytes.

Position, limit, capacity and mark don't affect the hash code.

Returns

  • The hash code calculated from the remaining bytes.

public abstract boolean isDirect()

Returns true if this buffer is direct.

A byte buffer is direct, if it is based on a byte buffer and the byte buffer is direct.

Returns

  • True if this buffer is direct.

public final ByteOrder order()

Returns the byte order used by this buffer when converting bytes from/to other primitive types.

The default byte order of byte buffer is always BIG_ENDIAN.

Returns

  • The byte order used by this buffer when converting bytes from/to other primitive types.

public final ByteBuffer order(ByteOrder byteOrder)

Sets the byte order of this buffer.

Parameters

byteOrder The byte order to set. If null then the order will be LITTLE_ENDIAN.

Returns

  • This buffer

See Also

public final ByteBuffer put(byte[] src)

Writes bytes in the given byte array to the current position and increase the position by the number of bytes written.

Calling this method has the same effect as put(src, 0, src.length).

Parameters

src The source byte array

Returns

  • This buffer

Throws

BufferOverflowException If remaining() is less than src.length
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer put(byte b)

Writes the given byte to the current position and increase the position by 1.

Parameters

b The byte to write

Returns

  • This buffer

Throws

BufferOverflowException If position is equal or greater than limit
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer put(int index, byte b)

Write a byte to the specified index of this buffer and the position is not changed.

Parameters

index The index, must be no less than zero and less than the limit
b The byte to write

Returns

  • This buffer

Throws

IndexOutOfBoundsException If index is invalid
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public ByteBuffer put(ByteBuffer src)

Writes all the remaining bytes of the src byte buffer to this buffer's current position, and increase both buffers' position by the number of bytes copied.

Parameters

src The source byte buffer

Returns

  • This buffer

Throws

BufferOverflowException If src.remaining() is greater than this buffer's remaining()
IllegalArgumentException If src is this buffer
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public ByteBuffer put(byte[] src, int off, int len)

Writes bytes in the given byte array, starting from the specified offset, to the current position and increase the position by the number of bytes written.

Parameters

src The source byte array
off The offset of byte array, must be no less than zero and no greater than src.length
len The number of bytes to write, must be no less than zero and no greater than src.length - off

Returns

  • This buffer

Throws

BufferOverflowException If remaining() is less than len
IndexOutOfBoundsException If either off or len is invalid
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putChar(int index, char value)

Write a char to the specified index of this buffer.

The char is converted to bytes using the current byte order. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 2
value The char to write

Returns

  • This buffer

Throws

IndexOutOfBoundsException If index is invalid
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putChar(char value)

Writes the given char to the current position and increase the position by 2.

The char is converted to bytes using the current byte order.

Parameters

value The char to write

Returns

  • This buffer

Throws

BufferOverflowException If position is greater than limit - 2
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putDouble(int index, double value)

Write a double to the specified index of this buffer.

The double is converted to bytes using the current byte order. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 8
value The double to write

Returns

  • This buffer

Throws

IndexOutOfBoundsException If index is invalid
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putDouble(double value)

Writes the given double to the current position and increase the position by 8.

The double is converted to bytes using the current byte order.

Parameters

value The double to write

Returns

  • This buffer

Throws

BufferOverflowException If position is greater than limit - 8
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putFloat(int index, float value)

Write a float to the specified index of this buffer.

The float is converted to bytes using the current byte order. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 4
value The float to write

Returns

  • This buffer

Throws

IndexOutOfBoundsException If index is invalid
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putFloat(float value)

Writes the given float to the current position and increase the position by 4.

The float is converted to bytes using the current byte order.

Parameters

value The float to write

Returns

  • This buffer

Throws

BufferOverflowException If position is greater than limit - 4
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putInt(int value)

Writes the given int to the current position and increase the position by 4.

The int is converted to bytes using the current byte order.

Parameters

value The int to write

Returns

  • This buffer

Throws

BufferOverflowException If position is greater than limit - 4
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putInt(int index, int value)

Write a int to the specified index of this buffer.

The int is converted to bytes using the current byte order. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 4
value The int to write

Returns

  • This buffer

Throws

IndexOutOfBoundsException If index is invalid
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putLong(long value)

Writes the given long to the current position and increase the position by 8.

The long is converted to bytes using the current byte order.

Parameters

value The long to write

Returns

  • This buffer

Throws

BufferOverflowException If position is greater than limit - 8
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putLong(int index, long value)

Write a long to the specified index of this buffer.

The long is converted to bytes using the current byte order. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 8
value The long to write

Returns

  • This buffer

Throws

IndexOutOfBoundsException If index is invalid
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putShort(int index, short value)

Write a short to the specified index of this buffer.

The short is converted to bytes using the current byte order. The position is not changed.

Parameters

index The index, must be no less than zero and equal or less than limit - 2
value The short to write

Returns

  • This buffer

Throws

IndexOutOfBoundsException If index is invalid
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer putShort(short value)

Writes the given short to the current position and increase the position by 2.

The short is converted to bytes using the current byte order.

Parameters

value The short to write

Returns

  • This buffer

Throws

BufferOverflowException If position is greater than limit - 2
ReadOnlyBufferException If no changes may be made to the contents of this buffer

public abstract ByteBuffer slice()

Returns a sliced buffer that shares content with this buffer.

The sliced buffer's capacity will be this buffer's remaining(), and its zero position will correspond to this buffer's current position. The new buffer's position will be 0, limit will be its capacity, and its mark is unset. The new buffer's readonly property and byte order are same as this buffer.

The new buffer shares content with this buffer, which means either buffer's change of content will be visible to the other. The two buffer's position, limit and mark are independent.

Returns

  • A sliced buffer that shares content with this buffer.

public String toString()

Returns a string represents the state of this byte buffer.

Returns

  • A string represents the state of this byte buffer.

public static ByteBuffer wrap(byte[] array)

Creates a new byte buffer by wrapping the given byte array.

Calling this method has the same effect as wrap(array, 0, array.length).

Parameters

array The byte array which the new buffer will be based on

Returns

  • The created byte buffer

public static ByteBuffer wrap(byte[] array, int start, int len)

Creates new a byte buffer by wrapping the given byte array.

The new buffer's position will be start, limit will be start + len, capacity will be the length of the array.

Parameters

array The byte array which the new buffer will be based on
start The start index, must be no less than zero and no greater than array.length
len The length, must be no less than zero and no greater than array.length - start

Returns

  • The created byte buffer

Throws

IndexOutOfBoundsException If either start or len is invalid
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