Class query.ExpNode 
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Class query.ExpNode 

java.lang.Object
   |
   +----query.ExpNode
public class ExpNode
extends Object
Superclass of all nodes that are components of the abstract syntax trees used to hold filter and ranking expressions.

Variable Index

o childNum
The number of this child among the children of its parent.
o query
The query context in which this Expnode exists.

Constructor Index

o ExpNode(Query)
Create a new ExpNode.

Method Index

o AddNewChild(ExpNode)
Add a new child to this node
o GetChildNum()
Return the number of this child node relative to its parent
o GetChildren()
Return an Vector of the children of this ExpNode
o GetNumChildren()
Return the number of children that this node has
o GetParent()
Return the parent of this node
o GetPropertyNames()
Return an enumeration which is the property names for this node.
o GetPropertyValue(String)
Return the value of a specific property (or null if the property does not exist).
o GetQuery()
Return the query context of this node
o ReplaceChild(ExpNode, int)
Replace a child of this node
o SetParent(ExpNode)
Set the parent of this node
o SetPropertyValue(String, Object)
set a specific property value
o Unparse()
Return a string representation of this node

Variables

o childNum 
  protected int childNum
The number of this child among the children of its parent.
o query 
  protected Query query
The query context in which this Expnode exists.

Constructors

o ExpNode 
  public ExpNode(Query query)
Create a new ExpNode.
Parameters:
query - The query context of this Expnode

Methods

o AddNewChild 
  public void AddNewChild(ExpNode newChild)
Add a new child to this node
Parameters:
newChild - the new child
o GetChildren 
  public Vector GetChildren()
Return an Vector of the children of this ExpNode
Returns:
the Vector of chilren.
o GetNumChildren 
  public int GetNumChildren()
Return the number of children that this node has
Returns:
the number of children that this node has.
o GetParent 
  public ExpNode GetParent()
Return the parent of this node
Returns:
the ExpNode that is the parent of this node.
o GetChildNum 
  public int GetChildNum()
Return the number of this child node relative to its parent
Returns:
the integer number that is this node's child number
o GetPropertyNames 
  public Enumeration GetPropertyNames()
Return an enumeration which is the property names for this node.
Returns:
an Enumeration containing all the property names of this ExpNode.
o GetPropertyValue 
  public Object GetPropertyValue(String key)
Return the value of a specific property (or null if the property does not exist). The caller should know the type of the value so it can cast it to the proper class.
Returns:
An Object that is the value of the requested property.
o ReplaceChild 
  public void ReplaceChild(ExpNode newChild,
                           int childNum)
Replace a child of this node
Parameters:
newChild - the child that is the replacement.
childNum - the number of the child to replace
o SetPropertyValue 
  protected void SetPropertyValue(String name,
                                  Object value)
set a specific property value
Parameters:
name - the name of the property to set
value - the value of the property
o SetParent 
  protected void SetParent(ExpNode parent)
Set the parent of this node
Parameters:
parent - The parent.
o Unparse 
  public abstract String Unparse()
Return a string representation of this node
Returns:
A String that is the unparsing of this node.
o GetQuery 
  public Query GetQuery()
Return the query context of this node
Returns:
a Query that is the context of this node. 
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