sjm.parse.tokens
Class SymbolRootNode

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

Field Summary

protected SymbolNode[]

children

Fields inherited from class sjm.parse.tokens.SymbolNode

children, 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