UTF32Reader (jackson-core 2.9.2)

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`	`NC`

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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`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)`

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
  - 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
  - NC
```
protected static final char NC
```
    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
```
  - _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
```
  - _tmpBuf
```
protected char[] _tmpBuf
```
- Constructor Detail
  - UTF32Reader
```
public UTF32Reader(IOContext ctxt,
                   InputStream in,
                   byte[] buf,
                   int ptr,
                   int len,
                   boolean isBigEndian)
```
- Method Detail
  - 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
  - read
```
public int read(char[] cbuf,
                int start,
                int len)
         throws IOException
```
    Specified by:
    
    read in class Reader
    
    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

LAST_VALID_UNICODE_CHAR

NC

_context

_in

_buffer

_ptr

_length

_bigEndian

_surrogate

_charCount

_byteCount

_managedBuffers

_tmpBuf

Constructor Detail

UTF32Reader

Method Detail

close

read

read