com.onewebsql.util.io
Class ProxyReader

java.lang.Object
  extended by java.io.Reader
      extended by java.io.FilterReader
          extended by com.onewebsql.util.io.ProxyReader
All Implemented Interfaces:
Closeable, Readable
Direct Known Subclasses:
CountReportingReader

public abstract class ProxyReader
extends FilterReader

A Proxy stream which acts as expected, that is it passes the method calls on to the proxied stream and doesn't change which methods are being called.

It is an alternative base class to FilterReader to increase reusability, because FilterReader changes the methods being called, such as read(char[]) to read(char[], int, int).


Field Summary
 
Fields inherited from class java.io.FilterReader
in
 
Fields inherited from class java.io.Reader
lock
 
Constructor Summary
ProxyReader(Reader proxy)
          Constructs a new ProxyReader.
 
Method Summary
 void close()
          Invokes the delegate's close() method.
 void mark(int idx)
          Invokes the delegate's mark(int) method.
 boolean markSupported()
          Invokes the delegate's markSupported() method.
 int read()
          Invokes the delegate's read() method.
 int read(char[] chr)
          Invokes the delegate's read(char[]) method.
 int read(char[] chr, int st, int end)
          Invokes the delegate's read(char[], int, int) method.
 boolean ready()
          Invokes the delegate's ready() method.
 void reset()
          Invokes the delegate's reset() method.
 long skip(long ln)
          Invokes the delegate's skip(long) method.
 
Methods inherited from class java.io.Reader
read
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ProxyReader

public ProxyReader(Reader proxy)
Constructs a new ProxyReader.

Parameters:
proxy - the Reader to delegate to
Method Detail

read

public int read()
         throws IOException
Invokes the delegate's read() method.

Overrides:
read in class FilterReader
Returns:
the character read or -1 if the end of stream
Throws:
IOException - if an I/O error occurs

read

public int read(char[] chr)
         throws IOException
Invokes the delegate's read(char[]) method.

Overrides:
read in class Reader
Parameters:
chr - the buffer to read the characters into
Returns:
the number of characters read or -1 if the end of stream
Throws:
IOException - if an I/O error occurs

read

public int read(char[] chr,
                int st,
                int end)
         throws IOException
Invokes the delegate's read(char[], int, int) method.

Overrides:
read in class FilterReader
Parameters:
chr - the buffer to read the characters into
st - The start offset
end - The number of bytes to read
Returns:
the number of characters read or -1 if the end of stream
Throws:
IOException - if an I/O error occurs

skip

public long skip(long ln)
          throws IOException
Invokes the delegate's skip(long) method.

Overrides:
skip in class FilterReader
Parameters:
ln - the number of bytes to skip
Returns:
the number of bytes to skipped or -1 if the end of stream
Throws:
IOException - if an I/O error occurs

ready

public boolean ready()
              throws IOException
Invokes the delegate's ready() method.

Overrides:
ready in class FilterReader
Returns:
true if the stream is ready to be read
Throws:
IOException - if an I/O error occurs

close

public void close()
           throws IOException
Invokes the delegate's close() method.

Specified by:
close in interface Closeable
Overrides:
close in class FilterReader
Throws:
IOException - if an I/O error occurs

mark

public void mark(int idx)
          throws IOException
Invokes the delegate's mark(int) method.

Overrides:
mark in class FilterReader
Parameters:
idx - read ahead limit
Throws:
IOException - if an I/O error occurs

reset

public void reset()
           throws IOException
Invokes the delegate's reset() method.

Overrides:
reset in class FilterReader
Throws:
IOException - if an I/O error occurs

markSupported

public boolean markSupported()
Invokes the delegate's markSupported() method.

Overrides:
markSupported in class FilterReader
Returns:
true if mark is supported, otherwise false


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