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openjava.ptree
Class ParseTreeObject  

java.lang.Object
  openjava.ptree.ParseTreeObject

All Implemented Interfaces:

java.lang.Cloneable, ParseTree

Direct Known Subclasses:

Leaf, List, NonLeaf

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public abstract class ParseTreeObject

extends java.lang.Object

implements ParseTree, java.lang.Cloneable

The ParseTree class presents for the node of parse tree. This may be a token node, Leaf, or may be a nonterminal node, NonLeaf.

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Field Summary
private static int	idCount           The idCount counts up generated ptree objects
protected static java.lang.String	LN           Why this modifier is not final ? - Because of javac bug in excuting it with -O option.
private  int	objectID           The object ID is object identifier number in order to determine two ptree variables refer to the same object.
private  ParseTreeObject	parent

 

Constructor Summary

ParseTreeObject()           Arrocates new parse-tree object and set identifier number on the object.

 

Method Summary
abstract  void	accept(openjava.ptree.util.ParseTreeVisitor visitor)           Accepts a ParseTreeVisitor object as the role of a Visitor in the Visitor pattern, as the role of an Element in the Visitor pattern.
abstract  void	childrenAccept(openjava.ptree.util.ParseTreeVisitor visitor)           Accepts a ParseTreeVisitor object as the role of a Visitor in the Visitor pattern, as the role of an Element in the Visitor pattern.
protected  java.lang.Object	clone()           clone() is fixed as a shallow copy.
static boolean	equal(ParseTree p, ParseTree q)           May return true if two ptree-nodes don't refer to not the same objects but their contents are equivalent.
abstract  boolean	equals(ParseTree p)           Tests if this parse-tree-node's value equals to the specified ptree-node's.
int	getObjectID()           Returns
ParseTreeObject	getParent()
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.
static int	lastObjectID()
ParseTree	makeCopy()           shallow copy
abstract  ParseTree	makeRecursiveCopy()           deep copy
void	replace(ParseTree replacement)
protected abstract  void	replaceChildWith(ParseTree dist, ParseTree replacement)
private  void	setObjectID()           Increments idCount class variable and set the instance's object identifier number to the number of idCount variable.
protected  void	setParent(ParseTreeObject parent)
java.lang.String	toFlattenString()           Generates the string expression from this node.
java.lang.String	toString()           Generates a string object of regular Java source code representing this parse-tree.

 

Methods inherited from class java.lang.Object

equals, finalize, getClass, notify, notifyAll, wait, wait, wait

 

Field Detail

LN

protected static java.lang.String LN

Why this modifier is not final ? - Because of javac bug in excuting it with -O option.

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parent

private ParseTreeObject parent

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objectID

private int objectID

The object ID is object identifier number in order to determine two ptree variables refer to the same object.

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idCount

private static int idCount

The idCount counts up generated ptree objects

Constructor Detail

ParseTreeObject

public ParseTreeObject()

Arrocates new parse-tree object and set identifier number on the object.

Method Detail

getParent

public final ParseTreeObject getParent()

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setParent

protected final void setParent(ParseTreeObject parent)

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replace

public final void replace(ParseTree replacement)
                   throws ParseTreeException

Specified by:

replace in interface ParseTree

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replaceChildWith

protected abstract void replaceChildWith(ParseTree dist,
                                         ParseTree replacement)
                                  throws ParseTreeException

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clone

protected final java.lang.Object clone()

clone() is fixed as a shallow copy.

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makeCopy

public ParseTree makeCopy()

shallow copy

Specified by:

makeCopy in interface ParseTree

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makeRecursiveCopy

public abstract ParseTree makeRecursiveCopy()

deep copy

Specified by:

makeRecursiveCopy in interface ParseTree

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equals

public abstract boolean equals(ParseTree p)

Tests if this parse-tree-node's value equals to the specified ptree-node's.

Specified by:

equals in interface ParseTree

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hashCode

public int hashCode()

Description copied from class: java.lang.Object

Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

• Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
• It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in java.util.Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

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toString

public java.lang.String toString()

Generates a string object of regular Java source code representing this parse-tree.

Specified by:

toString in interface ParseTree

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equal

public static final boolean equal(ParseTree p,
                                  ParseTree q)

May return true if two ptree-nodes don't refer to not the same objects but their contents are equivalent.

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lastObjectID

public static final int lastObjectID()

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setObjectID

private final void setObjectID()

Increments idCount class variable and set the instance's object identifier number to the number of idCount variable.

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getObjectID

public final int getObjectID()

Returns

Specified by:

getObjectID in interface ParseTree

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toFlattenString

public java.lang.String toFlattenString()

Generates the string expression from this node. Returned string doesn't have '"' without cancel ( \" ) and doesn't have newline.

This method is useful to embed ptree objects as a string literal in source code.

Specified by:

toFlattenString in interface ParseTree

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accept

public abstract void accept(openjava.ptree.util.ParseTreeVisitor visitor)
                     throws ParseTreeException

Accepts a ParseTreeVisitor object as the role of a Visitor in the Visitor pattern, as the role of an Element in the Visitor pattern.

This invoke an appropriate visit() method on the accepted visitor.

Specified by:

accept in interface ParseTree

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childrenAccept

public abstract void childrenAccept(openjava.ptree.util.ParseTreeVisitor visitor)
                             throws ParseTreeException

Accepts a ParseTreeVisitor object as the role of a Visitor in the Visitor pattern, as the role of an Element in the Visitor pattern.

This invoke an appropriate visit() method on each child ParseTree object with this visitor.

Specified by:

childrenAccept in interface ParseTree

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SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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