com.ibm.able.rules
Class AbleARLTokenStreamCache

java.lang.Object
  com.ibm.able.rules.AbleARLTokenStreamCache

All Implemented Interfaces:

antlr.TokenStream

public class AbleARLTokenStreamCache

extends java.lang.Object

implements antlr.TokenStream

This class is a specialized TokenStream that caches the contents of each token as it is obtained from the specified input stream, and can be used anywhere an ANTLR TokenStream can be used.

The contents of the cache can be obtained as a String or as a byte array. The latter might be useful in creating an input stream to pass to an ABLE lexer/parser to reparse the original stream.

Field Summary

protected int	myLine The current line in the input stream that is being parsed.
protected java.lang.String	myPref Prefix to the current line.
protected java.lang.StringBuffer	myStringBuffer The cached input stream, created from the individual tokens as each token is obtained from the input stream.
protected antlr.TokenStream	myTokenStream The 'real' input stream from which tokens are obtained; passed in through the constructor, and must never be null.

Constructor Summary

AbleARLTokenStreamCache(antlr.TokenStream theTokenStream)
Creates a new token stream cache.

Method Summary

byte[]	getBytes() Retrieves the current token cache as a byte array, which subsequently can be used to create an InputStream which can be used to reparse the stream.
java.lang.String	getString() Retrieves the current token cache as a string.
int	length() Retrieves the length of the current token cache.
antlr.Token	nextToken() Obtains and returns the next token from the input stream.
java.lang.String	toString() Retrieves the contents of the object as a string.

Methods inherited from class java.lang.Object

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

Field Detail

myTokenStream

protected antlr.TokenStream myTokenStream

The 'real' input stream from which tokens are obtained; passed in through the constructor, and must never be null.

myStringBuffer

protected java.lang.StringBuffer myStringBuffer

The cached input stream, created from the individual tokens as each token is obtained from the input stream.

myLine

protected int myLine

The current line in the input stream that is being parsed.

myPref

protected java.lang.String myPref

Prefix to the current line. Two blanks added each time "{" found; same removed each time "}" found.

Constructor Detail

AbleARLTokenStreamCache

public AbleARLTokenStreamCache(antlr.TokenStream theTokenStream)

Creates a new token stream cache.

Parameters:

theTokenStream - The input stream from which tokens are to be obtained and cached.

Method Detail

nextToken

public antlr.Token nextToken()
                      throws antlr.TokenStreamException

Obtains and returns the next token from the input stream. The contents of the token are cached.

Specified by:

nextToken in interface antlr.TokenStream

Returns:

A String containing the current contents of the cache.

Throws:

antlr.TokenStreamException

getString

public java.lang.String getString()

Retrieves the current token cache as a string.

Returns:

A String containing the current contents of the cache.

getBytes

public byte[] getBytes()

Retrieves the current token cache as a byte array, which subsequently can be used to create an InputStream which can be used to reparse the stream.

Returns:

A byte array containing the current contents of the cache.

length

public int length()

Retrieves the length of the current token cache.

Returns:

The length, in number of characers, of the current token cache.

toString

public java.lang.String toString()

Retrieves the contents of the object as a string.

Returns:

A String containing the current contents of the object.