com.ibm.commons.util.io
Class LookAheadInputStream

java.lang.Object
  java.io.InputStream
      com.ibm.commons.util.io.LookAheadInputStream

All Implemented Interfaces:

java.io.Closeable

public class LookAheadInputStream
extends java.io.InputStream

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

Constructor Summary

LookAheadInputStream(java.io.InputStream is, int bufferLength)
Constructor.

Method Summary

void	close()
int	getBufferLength()
int	getByte() Read one byte ahead.
byte[]	getByteAhead(int maxChars) Get a string of # characters.
int	getByteAt(int pos) Read a byte ahead.
char	getChar()
char	getCharAt(int index)
int	getCurrentIndex()
boolean	hasByte() Check if the end of the stream 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(byte[] cbuf, int off, int len)
protected int	readBuffer(byte[] buffer, int position, int count) Internal function that read data into the buffer.
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.InputStream

available, mark, markSupported, read, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

LookAheadInputStream

public LookAheadInputStream(java.io.InputStream is,
                            int bufferLength)

Constructor.

Method Detail

getBufferLength

public int getBufferLength()

read

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

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

read

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

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

skip

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

Overrides:

skip in class java.io.InputStream

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException

getCurrentIndex

public int getCurrentIndex()

readBuffer

protected int readBuffer(byte[] 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

hasByte

public boolean hasByte()
                throws java.io.IOException

Check if the end of the stream has been reached

Throws:

java.io.IOException

getByteAt

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

Read a byte 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

getByte

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

Read one byte ahead.

Returns:

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

Throws:

java.io.IOException

getByteAhead

public byte[] getByteAhead(int maxChars)
                    throws java.io.IOException

Get a string of # characters. Mainly for debugging!

Throws:

java.io.IOException

getChar

public char getChar()
             throws java.io.IOException

Throws:

java.io.IOException

getCharAt

public char getCharAt(int index)
               throws java.io.IOException

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