UTF32Reader (Jackson JSON Processor)

java.lang.Object
- java.io.Reader
- - org.codehaus.jackson.io.UTF32Reader

```
public final class UTF32Reader
extends java.io.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	Description
`protected byte[]`	`_buffer`
`protected IOContext`	`_context`
`protected java.io.InputStream`	`_in`
`protected int`	`_length`
`protected int`	`_ptr`
`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	Description
`UTF32Reader(IOContext ctxt, java.io.InputStream in, byte[] buf, int ptr, int len, boolean isBigEndian)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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

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
- 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 java.io.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,
                   java.io.InputStream in,
                   byte[] buf,
                   int ptr,
                   int len,
                   boolean isBigEndian)

Method Detail
- read
```
public int read(char[] cbuf,
                int start,
                int len)
         throws java.io.IOException
```
  Specified by:
  
  read in class java.io.Reader
  
  Throws:
  
  java.io.IOException
- close
```
public void close()
           throws java.io.IOException
```
  Specified by:
  
  close in class java.io.Reader
  
  Throws:
  
  java.io.IOException
- read
```
public int read()
         throws java.io.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 java.io.Reader
  
  Throws:
  
  java.io.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 java.io.IOException
```
  Throws:
  
  java.io.IOException
- reportStrangeStream
```
protected void reportStrangeStream()
                            throws java.io.IOException
```
  Throws:
  
  java.io.IOException

Class UTF32Reader

Field Summary

Fields inherited from class java.io.Reader

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from class java.io.Reader

Field Detail

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