org.apache.http.util

## Class ByteArrayBuffer

- java.lang.Object
- - org.apache.http.util.ByteArrayBuffer

- All Implemented Interfaces:
    Serializable

      @NotThreadSafe
      public final class ByteArrayBuffer
      extends Object
      implements Serializable

  A resizable byte array.
  Since:
    4.0
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ByteArrayBuffer(int capacity)` Creates an instance of `ByteArrayBuffer` with the given initial capacity.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `append(byte[] b, int off, int len)` Appends `len` bytes to this buffer from the given source array starting at index `off`.
    `void` | `append(char[] b, int off, int len)` Appends `len` chars to this buffer from the given source array starting at index `off`.
    `void` | `append(CharArrayBuffer b, int off, int len)` Appends `len` chars to this buffer from the given source char array buffer starting at index `off`.
    `void` | `append(int b)` Appends `b` byte to this buffer.
    `byte[]` | `buffer()` Returns reference to the underlying byte array.
    `int` | `byteAt(int i)` Returns the `byte` value in this buffer at the specified index.
    `int` | `capacity()` Returns the current capacity.
    `void` | `clear()` Clears content of the buffer.
    `void` | `ensureCapacity(int required)` Ensures that the capacity is at least equal to the specified minimum.
    `int` | `indexOf(byte b)` Returns the index within this buffer of the first occurrence of the specified byte, starting the search at `0` and finishing at `length()`.
    `int` | `indexOf(byte b, int from, int to)` Returns the index within this buffer of the first occurrence of the specified byte, starting the search at the specified `beginIndex` and finishing at `endIndex`.
    `boolean` | `isEmpty()` Returns `true` if this buffer is empty, that is, its `length()` is equal to `0`.
    `boolean` | `isFull()` Returns `true` if this buffer is full, that is, its `length()` is equal to its `capacity()`.
    `int` | `length()` Returns the length of the buffer (byte count).
    `void` | `setLength(int len)` Sets the length of the buffer.
    `byte[]` | `toByteArray()` Converts the content of this buffer to an array of bytes.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### ByteArrayBuffer

          public ByteArrayBuffer(int capacity)

      Creates an instance of `ByteArrayBuffer` with the given initial capacity.
      Parameters:
        `capacity` - the capacity

  - ### Method Detail

    - #### append

          public void append(byte[] b,
                    int off,
                    int len)

      Appends `len` bytes to this buffer from the given source array starting at index `off`. The capacity of the buffer is increased, if necessary, to accommodate all `len` bytes.
      Parameters:
        `b` - the bytes to be appended.
        `off` - the index of the first byte to append.
        `len` - the number of bytes to append.
      Throws:
        `IndexOutOfBoundsException` - if `off` if out of range, `len` is negative, or `off` + `len` is out of range.

    - #### append

          public void append(int b)

      Appends `b` byte to this buffer. The capacity of the buffer is increased, if necessary, to accommodate the additional byte.
      Parameters:
        `b` - the byte to be appended.

    - #### append

          public void append(char[] b,
                    int off,
                    int len)

      Appends `len` chars to this buffer from the given source array starting at index `off`. The capacity of the buffer is increased if necessary to accommodate all `len` chars.

      The chars are converted to bytes using simple cast.

      Parameters:
        `b` - the chars to be appended.
        `off` - the index of the first char to append.
        `len` - the number of bytes to append.
      Throws:
        `IndexOutOfBoundsException` - if `off` if out of range, `len` is negative, or `off` + `len` is out of range.

    - #### append

          public void append(CharArrayBuffer b,
                    int off,
                    int len)

      Appends `len` chars to this buffer from the given source char array buffer starting at index `off`. The capacity of the buffer is increased if necessary to accommodate all `len` chars.

      The chars are converted to bytes using simple cast.

      Parameters:
        `b` - the chars to be appended.
        `off` - the index of the first char to append.
        `len` - the number of bytes to append.
      Throws:
        `IndexOutOfBoundsException` - if `off` if out of range, `len` is negative, or `off` + `len` is out of range.

    - #### clear

          public void clear()

      Clears content of the buffer. The underlying byte array is not resized.

    - #### toByteArray

          public byte[] toByteArray()

      Converts the content of this buffer to an array of bytes.
      Returns:
        byte array

    - #### byteAt

          public int byteAt(int i)

      Returns the `byte` value in this buffer at the specified index. The index argument must be greater than or equal to `0`, and less than the length of this buffer.
      Parameters:
        `i` - the index of the desired byte value.
      Returns:
        the byte value at the specified index.
      Throws:
        `IndexOutOfBoundsException` - if `index` is negative or greater than or equal to `length()`.

    - #### capacity

          public int capacity()

      Returns the current capacity. The capacity is the amount of storage available for newly appended bytes, beyond which an allocation will occur.
      Returns:
        the current capacity

    - #### length

          public int length()

      Returns the length of the buffer (byte count).
      Returns:
        the length of the buffer

    - #### ensureCapacity

          public void ensureCapacity(int required)

      Ensures that the capacity is at least equal to the specified minimum. If the current capacity is less than the argument, then a new internal array is allocated with greater capacity. If the `required` argument is non-positive, this method takes no action.
      Parameters:
        `required` - the minimum required capacity.
      Since:
        4.1

    - #### buffer

          public byte[] buffer()

      Returns reference to the underlying byte array.
      Returns:
        the byte array.

    - #### setLength

          public void setLength(int len)

      Sets the length of the buffer. The new length value is expected to be less than the current capacity and greater than or equal to `0`.
      Parameters:
        `len` - the new length
      Throws:
        `IndexOutOfBoundsException` - if the `len` argument is greater than the current capacity of the buffer or less than `0`.

    - #### isEmpty

          public boolean isEmpty()

      Returns `true` if this buffer is empty, that is, its `length()` is equal to `0`.
      Returns:
        `true` if this buffer is empty, `false` otherwise.

    - #### isFull

          public boolean isFull()

      Returns `true` if this buffer is full, that is, its `length()` is equal to its `capacity()`.
      Returns:
        `true` if this buffer is full, `false` otherwise.

    - #### indexOf

          public int indexOf(byte b,
                    int from,
                    int to)

      Returns the index within this buffer of the first occurrence of the specified byte, starting the search at the specified `beginIndex` and finishing at `endIndex`. If no such byte occurs in this buffer within the specified bounds, `-1` is returned.

      There is no restriction on the value of `beginIndex` and `endIndex`. If `beginIndex` is negative, it has the same effect as if it were zero. If `endIndex` is greater than `length()`, it has the same effect as if it were `length()`. If the `beginIndex` is greater than the `endIndex`, `-1` is returned.

      Parameters:
        `b` - the byte to search for.
        `from` - the index to start the search from.
        `to` - the index to finish the search at.
      Returns:
        the index of the first occurrence of the byte in the buffer within the given bounds, or `-1` if the byte does not occur.
      Since:
        4.1

    - #### indexOf

          public int indexOf(byte b)

      Returns the index within this buffer of the first occurrence of the specified byte, starting the search at `0` and finishing at `length()`. If no such byte occurs in this buffer within those bounds, `-1` is returned.
      Parameters:
        `b` - the byte to search for.
      Returns:
        the index of the first occurrence of the byte in the buffer, or `-1` if the byte does not occur.
      Since:
        4.1

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