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com.ibatis.common.io
Class ReaderInputStream  view ReaderInputStream download ReaderInputStream.java

java.lang.Object
  extended byjava.io.InputStream
      extended bycom.ibatis.common.io.ReaderInputStream
All Implemented Interfaces:
java.io.Closeable

public class ReaderInputStream
extends java.io.InputStream

An InputStream backed by a Reader


Field Summary
protected  byte[] buffer
           
protected  java.io.ByteArrayOutputStream byteArrayOut
           
protected  char[] chars
           
protected  int index
           
protected  int length
           
protected  java.io.Reader reader
           
protected  java.io.Writer writer
           
 
Constructor Summary
ReaderInputStream(java.io.Reader reader)
          Constructor to supply a Reader
ReaderInputStream(java.io.Reader reader, java.lang.String encoding)
          Constructor to supply a Reader and an encoding
 
Method Summary
 int available()
          This method returns the number of bytes that can be read from this stream before a read can block.
 void close()
          This method closes the stream.
protected  void fillBuffer()
           
 int read()
          This method reads an unsigned byte from the input stream and returns it as an int in the range of 0-255.
 int read(byte[] data, int off, int len)
          This method read bytes from a stream and stores them into a caller supplied buffer.
 
Methods inherited from class java.io.InputStream
mark, markSupported, read, reset, skip
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

reader

protected java.io.Reader reader

byteArrayOut

protected java.io.ByteArrayOutputStream byteArrayOut

writer

protected java.io.Writer writer

chars

protected char[] chars

buffer

protected byte[] buffer

index

protected int index

length

protected int length
Constructor Detail

ReaderInputStream

public ReaderInputStream(java.io.Reader reader)
Constructor to supply a Reader


ReaderInputStream

public ReaderInputStream(java.io.Reader reader,
                         java.lang.String encoding)
                  throws java.io.UnsupportedEncodingException
Constructor to supply a Reader and an encoding

Method Detail

read

public int read()
         throws java.io.IOException
Description copied from class: java.io.InputStream
This method reads an unsigned byte from the input stream and returns it as an int in the range of 0-255. This method also will return -1 if the end of the stream has been reached.

This method will block until the byte can be read.


fillBuffer

protected void fillBuffer()
                   throws java.io.IOException

read

public int read(byte[] data,
                int off,
                int len)
         throws java.io.IOException
Description copied from class: java.io.InputStream
This method read bytes from a stream and stores them into a caller supplied buffer. It starts storing the data at index off into the buffer and attempts to read len bytes. This method can return before reading the number of bytes requested. The actual number of bytes read is returned as an int. A -1 is returned to indicate the end of the stream.

This method will block until some data can be read.

This method operates by calling the single byte read() method in a loop until the desired number of bytes are read. The read loop stops short if the end of the stream is encountered or if an IOException is encountered on any read operation except the first. If the first attempt to read a bytes fails, the IOException is allowed to propagate upward. And subsequent IOException is caught and treated identically to an end of stream condition. Subclasses can (and should if possible) override this method to provide a more efficient implementation.


available

public int available()
              throws java.io.IOException
Description copied from class: java.io.InputStream
This method returns the number of bytes that can be read from this stream before a read can block. A return of 0 indicates that blocking might (or might not) occur on the very next read attempt.

This method always returns 0 in this class


close

public void close()
           throws java.io.IOException
Description copied from class: java.io.InputStream
This method closes the stream. Any futher attempts to read from the stream may generate an IOException

This method does nothing in this class, but subclasses may override this method in order to provide additional functionality.