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Java Source Code / Java Documentation » ERP CRM Financial » SourceTap CRM » org.ofbiz.rules.parse.tokens 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.ofbiz.rules.parse.tokens.SymbolNode

All known Subclasses:   org.ofbiz.rules.parse.tokens.SymbolRootNode,
SymbolNode
public class SymbolNode (Code)

Title: Symbol Node

Description: None

Copyright (c) 2000 Steven J. Metsker.

Copyright (c) 2001 The Open For Business Project - www.ofbiz.org

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
A SymbolNode object is a member of a tree that contains all possible prefixes of allowable symbols. Multi- character symbols appear in a SymbolNode tree with one node for each character. For example, the symbol =:~ will appear in a tree as three nodes. The first node contains an equals sign, and has a child; that child contains a colon and has a child; this third child contains a tilde, and has no children of its own. If the colon node had another child for a dollar sign character, then the tree would contain the symbol =:$. A tree of SymbolNode objects collaborate to read a (potentially multi-character) symbol from an input stream. A root node with no character of its own finds an initial node that represents the first character in the input. This node looks to see if the next character in the stream matches one of its children. If so, the node delegates its reading task to its child. This approach walks down the tree, pulling symbols from the input that match the path down the tree. When a node does not have a child that matches the next character, we will have read the longest possible symbol prefix. This prefix may or may not be a valid symbol. Consider a tree that has had =:~ added and has not had =: added. In this tree, of the three nodes that contain =:~, only the first and third contain complete symbols. If, say, the input contains =:a, the colon node will not have a child that matches the 'a' and so it will stop reading. The colon node has to "unread": it must push back its character, and ask its parent to unread. Unreading continues until it reaches an ancestor that represents a valid symbol.
author:
   Steven J. Metsker
version:
   1.0



Field Summary
protected  Listchildren
    
protected  charmyChar
    
protected  SymbolNodeparent
    
protected  booleanvalid
    

Constructor Summary
public  SymbolNode(SymbolNode parent, char myChar)
     Constructs a SymbolNode with the given parent, representing the given character.

Method Summary
protected  voidaddDescendantLine(String s)
     Add a line of descendants that represent the characters in the given string.
public  Stringancestry()
     Show the symbol this node represents.
protected  SymbolNodedeepestRead(PushbackReader r)
     Find the descendant that takes as many characters as possible from the input.
protected  SymbolNodeensureChildWithChar(char c)
     Find or create a child for the given character.
protected  SymbolNodefindChildWithChar(char c)
     Find a child with the given character.
protected  SymbolNodefindDescendant(String s)
     Find a descendant which is down the path the given string indicates.
protected  voidsetValid(boolean b)
     Mark this node as valid, which means its ancestry is a complete symbol, not just a prefix.
public  StringtoString()
     Give a string representation of this node.
protected  SymbolNodeunreadToValid(PushbackReader r)
     Unwind to a valid node; this node is "valid" if its ancestry represents a complete symbol.

Field Detail
children
protected List children(Code)



myChar
protected char myChar(Code)



parent
protected SymbolNode parent(Code)



valid
protected boolean valid(Code)




Constructor Detail
SymbolNode
public SymbolNode(SymbolNode parent, char myChar)(Code)
Constructs a SymbolNode with the given parent, representing the given character.
Parameters:
  SymbolNode - this node's parent char this node's character




Method Detail
addDescendantLine
protected void addDescendantLine(String s)(Code)
Add a line of descendants that represent the characters in the given string.



ancestry
public String ancestry()(Code)
Show the symbol this node represents. the symbol this node represents



deepestRead
protected SymbolNode deepestRead(PushbackReader r) throws IOException(Code)
Find the descendant that takes as many characters as possible from the input.



ensureChildWithChar
protected SymbolNode ensureChildWithChar(char c)(Code)
Find or create a child for the given character.



findChildWithChar
protected SymbolNode findChildWithChar(char c)(Code)
Find a child with the given character.



findDescendant
protected SymbolNode findDescendant(String s)(Code)
Find a descendant which is down the path the given string indicates.



setValid
protected void setValid(boolean b)(Code)
Mark this node as valid, which means its ancestry is a complete symbol, not just a prefix.



toString
public String toString()(Code)
Give a string representation of this node. a string representation of this node



unreadToValid
protected SymbolNode unreadToValid(PushbackReader r) throws IOException(Code)
Unwind to a valid node; this node is "valid" if its ancestry represents a complete symbol. If this node is not valid, put back the character and ask the parent to unwind.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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