com.ibm.commons.util.io
Class LookAheadReader

java.lang.Object
  java.io.Reader
      com.ibm.commons.util.io.LookAheadReader

All Implemented Interfaces:

java.io.Closeable, java.lang.Readable

public class LookAheadReader
extends java.io.Reader

The lexical reader is a specific reader that cache some data of another reader and that permits a lookup of characters.

Field Summary

Fields inherited from class java.io.Reader

lock

Constructor Summary

LookAheadReader(java.io.Reader reader, int bufferLength)
Constructor.

Method Summary

void	close()
void	copy(java.io.Writer w) Copy to a writer
int	getBufferLength()
int	getChar() Read one character ahead.
int	getCharAt(int pos) Read a character ahead.
int	getCurrentIndex()
java.lang.String	getStringAhead(int maxChars) Get a string of # characters.
boolean	hasChar() Check if the end of the strealm has been reached
boolean	match(char c)
boolean	match(java.lang.String s)
boolean	matchIgnoreCase(char c)
boolean	matchIgnoreCase(java.lang.String s)
int	read()
int	read(char[] cbuf, int off, int len)
protected int	readBuffer(char[] buffer, int position, int count) Internal function that read data into the buffer.
int	readCDATABase64()
int	readCDATABase64Bytes(byte[] b)
int	readCDATABase64Bytes(byte[] b, int off, int len)
long	skip(long len)
boolean	skipBlanks()
boolean	skipBlanks(FastStringBuffer b) Skip a list of blanks characters (space, new line, tab...).
void	skipUpto(char c)
boolean	startsWith(char c)
boolean	startsWith(java.lang.String s)
boolean	startsWithIgnoreCase(char c)
boolean	startsWithIgnoreCase(java.lang.String s)
java.lang.String	upto(char c)

Methods inherited from class java.io.Reader

mark, markSupported, read, read, ready, reset

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LookAheadReader

public LookAheadReader(java.io.Reader reader,
                       int bufferLength)

Constructor.

Method Detail

getBufferLength

public int getBufferLength()

read

public final int read()
               throws java.io.IOException

Overrides:

read in class java.io.Reader

Throws:

java.io.IOException

readCDATABase64

public final int readCDATABase64()
                          throws java.io.IOException

Throws:

java.io.IOException

readCDATABase64Bytes

public final int readCDATABase64Bytes(byte[] b)
                               throws java.io.IOException

Throws:

java.io.IOException

readCDATABase64Bytes

public final int readCDATABase64Bytes(byte[] b,
                                      int off,
                                      int len)
                               throws java.io.IOException

Throws:

java.io.IOException

read

public int read(char[] cbuf,
                int off,
                int len)
         throws java.io.IOException

Specified by:

read in class java.io.Reader

Throws:

java.io.IOException

skip

public long skip(long len)
          throws java.io.IOException

Overrides:

skip in class java.io.Reader

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in class java.io.Reader

Throws:

java.io.IOException

getCurrentIndex

public int getCurrentIndex()

readBuffer

protected int readBuffer(char[] buffer,
                         int position,
                         int count)
                  throws java.io.IOException

Internal function that read data into the buffer. It can be overriden in order to set some kind of filters (skipping blanks, comments...).

Throws:

java.io.IOException

hasChar

public boolean hasChar()
                throws java.io.IOException

Check if the end of the strealm has been reached

Throws:

java.io.IOException

getCharAt

public final int getCharAt(int pos)
                    throws java.io.IOException

Read a character ahead. The position cannot be greater than the buffer length.

Parameters:

pos - the character position

Returns:

the character, -1 if not available (not enough character in the reader)

Throws:

java.io.IOException

getChar

public final int getChar()
                  throws java.io.IOException

Read one character ahead.

Returns:

the character, -1 if not available (not enough character in the reader)

Throws:

java.io.IOException

getStringAhead

public java.lang.String getStringAhead(int maxChars)
                                throws java.io.IOException

Get a string of # characters. Mainly for debugging!

Throws:

java.io.IOException

startsWith

public boolean startsWith(char c)
                   throws java.io.IOException

Throws:

java.io.IOException

startsWithIgnoreCase

public boolean startsWithIgnoreCase(char c)
                             throws java.io.IOException

Throws:

java.io.IOException

startsWith

public boolean startsWith(java.lang.String s)
                   throws java.io.IOException

Throws:

java.io.IOException

startsWithIgnoreCase

public boolean startsWithIgnoreCase(java.lang.String s)
                             throws java.io.IOException

Throws:

java.io.IOException

match

public boolean match(char c)
              throws java.io.IOException

Throws:

java.io.IOException

matchIgnoreCase

public boolean matchIgnoreCase(char c)
                        throws java.io.IOException

Throws:

java.io.IOException

match

public boolean match(java.lang.String s)
              throws java.io.IOException

Throws:

java.io.IOException

matchIgnoreCase

public boolean matchIgnoreCase(java.lang.String s)
                        throws java.io.IOException

Throws:

java.io.IOException

skipBlanks

public boolean skipBlanks(FastStringBuffer b)
                   throws java.io.IOException

Skip a list of blanks characters (space, new line, tab...).

Throws:

java.io.IOException

skipBlanks

public boolean skipBlanks()
                   throws java.io.IOException

Throws:

java.io.IOException

skipUpto

public void skipUpto(char c)
              throws java.io.IOException

Throws:

java.io.IOException

upto

public java.lang.String upto(char c)
                      throws java.io.IOException

Throws:

java.io.IOException

copy

public void copy(java.io.Writer w)
          throws java.io.IOException

Copy to a writer

Throws:

java.io.IOException