java.lang.Object
- com.foxinmy.weixin4j.util.ByteArrayBuffer

All Implemented Interfaces:

Serializable
```
public final class ByteArrayBuffer
extends Object
implements Serializable
```
A resizable byte array.

Since:

4.0

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

ByteArrayBuffer(int capacity)
Creates an instance of ByteArrayBuffer with the given initial capacity.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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(int b)`	Appends `b` byte to this buffer.
`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`.
`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

Class ByteArrayBuffer

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ByteArrayBuffer

Method Detail

append

append

append

append

clear

toByteArray

byteAt

capacity

length

ensureCapacity

buffer

setLength

isEmpty

isFull

indexOf

indexOf