UTF32Reader (jackson-core 2.1.2)

java.lang.Object
- java.io.Reader
- - com.fasterxml.jackson.core.io.UTF32Reader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable
```
public class UTF32Reader
extends Reader
```
Since JDK does not come with UTF-32/UCS-4, let's implement a simple decoder to use.

Field Summary

Fields
Modifier and Type	Field and Description
`protected boolean`	`_bigEndian`
`protected byte[]`	`_buffer`
`protected int`	`_byteCount` Total read byte count; used for error reporting purposes
`protected int`	`_charCount` Total read character count; used for error reporting purposes
`protected IOContext`	`_context`
`protected InputStream`	`_in`
`protected int`	`_length`
`protected boolean`	`_managedBuffers`
`protected int`	`_ptr`
`protected char`	`_surrogate` Although input is fine with full Unicode set, Java still uses 16-bit chars, so we may have to split high-order chars into surrogate pairs.
`protected char[]`	`_tmpBuf`
`protected static int`	`LAST_VALID_UNICODE_CHAR` JSON actually limits available Unicode range in the high end to the same as xml (to basically limit UTF-8 max byte sequence length to 4)
`protected static char`	`NULL_BYTE`
`protected static char`	`NULL_CHAR`

Fields inherited from class java.io.Reader
lock

Constructor Summary

Constructors
Constructor and Description
`UTF32Reader(IOContext ctxt, InputStream in, byte[] buf, int ptr, int len, boolean isBigEndian)`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`close()`
`void`	`freeBuffers()` This method should be called along with (or instead of) normal close.
`int`	`read()` Although this method is implemented by the base class, AND it should never be called by main code, let's still implement it bit more efficiently just in case
`int`	`read(char[] cbuf, int start, int len)`
`protected void`	`reportBounds(char[] cbuf, int start, int len)`
`protected void`	`reportStrangeStream()`

Methods inherited from class java.io.Reader
mark, markSupported, read, read, ready, reset, skip

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - _bigEndian
```
protected final boolean _bigEndian
```
  - _surrogate
```
protected char _surrogate
```
    Although input is fine with full Unicode set, Java still uses 16-bit chars, so we may have to split high-order chars into surrogate pairs.
  - _charCount
```
protected int _charCount
```
    Total read character count; used for error reporting purposes
  - _byteCount
```
protected int _byteCount
```
    Total read byte count; used for error reporting purposes
  - _managedBuffers
```
protected final boolean _managedBuffers
```
  - LAST_VALID_UNICODE_CHAR
```
protected static final int LAST_VALID_UNICODE_CHAR
```
    JSON actually limits available Unicode range in the high end to the same as xml (to basically limit UTF-8 max byte sequence length to 4)
    
    See Also:
    Constant Field Values
  - NULL_CHAR
```
protected static final char NULL_CHAR
```
    See Also:
    Constant Field Values
  - NULL_BYTE
```
protected static final char NULL_BYTE
```
    See Also:
    Constant Field Values
  - _context
```
protected final IOContext _context
```
  - _in
```
protected InputStream _in
```
  - _buffer
```
protected byte[] _buffer
```
  - _ptr
```
protected int _ptr
```
  - _length
```
protected int _length
```
  - _tmpBuf
```
protected char[] _tmpBuf
```
- Constructor Detail
  - UTF32Reader
```
public UTF32Reader(IOContext ctxt,
           InputStream in,
           byte[] buf,
           int ptr,
           int len,
           boolean isBigEndian)
```
- Method Detail
  - read
```
public int read(char[] cbuf,
       int start,
       int len)
         throws IOException
```
    Specified by:
    
    read in class Reader
    
    Throws:
    
    IOException
  - close
```
public void close()
           throws IOException
```
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in class Reader
    
    Throws:
    
    IOException
  - read
```
public int read()
         throws IOException
```
    Although this method is implemented by the base class, AND it should never be called by main code, let's still implement it bit more efficiently just in case
    
    Overrides:
    
    read in class Reader
    
    Throws:
    
    IOException
  - freeBuffers
```
public final void freeBuffers()
```
    This method should be called along with (or instead of) normal close. After calling this method, no further reads should be tried. Method will try to recycle read buffers (if any).
  - reportBounds
```
protected void reportBounds(char[] cbuf,
                int start,
                int len)
                     throws IOException
```
    Throws:
    
    IOException
  - reportStrangeStream
```
protected void reportStrangeStream()
                            throws IOException
```
    Throws:
    
    IOException

Class UTF32Reader

Field Summary

Fields inherited from class java.io.Reader

Constructor Summary

Method Summary

Methods inherited from class java.io.Reader

Methods inherited from class java.lang.Object

Field Detail

_bigEndian

_surrogate

_charCount

_byteCount

_managedBuffers

LAST_VALID_UNICODE_CHAR

NULL_CHAR

NULL_BYTE

_context

_in

_buffer

_ptr

_length

_tmpBuf

Constructor Detail

UTF32Reader

Method Detail

read

close

read

freeBuffers

reportBounds

reportStrangeStream