sjm.parse.tokens
Class SymbolRootNode

java.lang.Object
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  +--sjm.parse.tokens.SymbolNode
        |
        +--sjm.parse.tokens.SymbolRootNode

public class SymbolRootNode

extends SymbolNode

This class is a special case of a SymbolNode. A SymbolRootNode object has no symbol of its own, but has children that represent all possible symbols.

Version:

1.0

Author:

Steven J. Metsker

Field Summary

protected SymbolNode[]

children

Fields inherited from class sjm.parse.tokens.SymbolNode

myChar, parent, valid

Constructor Summary

SymbolRootNode()
Create and initialize a root node.

Method Summary

void	add(java.lang.String s) Add the given string as a symbol.
java.lang.String	ancestry() A root node has no parent and no character of its own, so its ancestry is "".
protected SymbolNode	findChildWithChar(char c)
protected void	init()
java.lang.String	nextSymbol(java.io.PushbackReader r, int first) Return a symbol string from a reader.

Methods inherited from class sjm.parse.tokens.SymbolNode

addDescendantLine, deepestRead, ensureChildWithChar, findDescendant, setValid, toString, unreadToValid

Methods inherited from class java.lang.Object

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

Field Detail

children

protected SymbolNode[] children

Constructor Detail

SymbolRootNode

public SymbolRootNode()

Create and initialize a root node.

Method Detail

add

public void add(java.lang.String s)

Add the given string as a symbol.

Parameters:

String - the character sequence to add

ancestry

public java.lang.String ancestry()

A root node has no parent and no character of its own, so its ancestry is "".

Overrides:

ancestry in class SymbolNode

Returns:

an empty string

findChildWithChar

protected SymbolNode findChildWithChar(char c)

Overrides:

findChildWithChar in class SymbolNode

init

protected void init()

nextSymbol

public java.lang.String nextSymbol(java.io.PushbackReader r,
                                   int first)
                            throws java.io.IOException

Return a symbol string from a reader.

Parameters:

PushbackReader - a reader to read from

int - the first character of this symbol, already read from the reader

Returns:

a symbol string from a reader