de.unidu.is.retrieval
Class BooleanQueryNode

java.lang.Object
  de.unidu.is.retrieval.BooleanQueryNode

All Implemented Interfaces:

QueryNode

Direct Known Subclasses:

AndQueryNode, OrQueryNode

public abstract class BooleanQueryNode

extends java.lang.Object

implements QueryNode

A query node representating a Boolean connector.

Since:

2004-05-22

Version:

$Revision: 1.6 $, $Date: 2005/02/28 22:27:55 $

Author:

Henrik Nottelmann

Field Summary

protected java.util.Set

children Set of children nodes (QueryNode instances).

Constructor Summary

BooleanQueryNode()
Creates a new object.

BooleanQueryNode(java.util.Set children)
Creates a new object.

Method Summary

void	add(QueryNode node) Adds the specified query node as a child.
QueryNode	cloneNode() Clones this node.
boolean	equals(java.lang.Object obj)
java.util.Set	getChildren() Returns the children.
protected abstract java.lang.String	getConnector() Returns a XIRQL representation of the connector represented by this node.
int	hashCode()
java.util.Iterator	iterator() Returns an iterator over the children of this node.
protected abstract BooleanQueryNode	newNode() Returns a new, empty node of this type.
protected abstract boolean	sameClass(QueryNode node) Returns true iff the specified query node represents the same class as this node.
void	setChildren(java.util.Set list) Sets the children.
QueryNode	simplifiedNode() Simplifies this node.
java.lang.String	toPrefix() Returns the node in prefix notation.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface de.unidu.is.retrieval.QueryNode

isDF, toDF

Field Detail

children

protected java.util.Set children

Set of children nodes (QueryNode instances).

Constructor Detail

BooleanQueryNode

public BooleanQueryNode()

Creates a new object.

BooleanQueryNode

public BooleanQueryNode(java.util.Set children)

Creates a new object.

Parameters:

children - children nodes

Method Detail

getChildren

public java.util.Set getChildren()

Returns the children.

Returns:

children nodes

setChildren

public void setChildren(java.util.Set list)

Sets the children.

Parameters:

list - children nodes

add

public void add(QueryNode node)

Adds the specified query node as a child.

Parameters:

node - new child node

getConnector

protected abstract java.lang.String getConnector()

Returns a XIRQL representation of the connector represented by this node.

Returns:

XIRQL representation of the connector

toString

public java.lang.String toString()

toPrefix

public java.lang.String toPrefix()

Description copied from interface: QueryNode

Returns the node in prefix notation.

Specified by:

toPrefix in interface QueryNode

Returns:

node in prefix notation

iterator

public java.util.Iterator iterator()

Description copied from interface: QueryNode

Returns an iterator over the children of this node.

Specified by:

iterator in interface QueryNode

Returns:

iterator over children nodes

simplifiedNode

public QueryNode simplifiedNode()

Description copied from interface: QueryNode

Simplifies this node.

Specified by:

simplifiedNode in interface QueryNode

Returns:

simplified node (or this node, if no simplication is required)

sameClass

protected abstract boolean sameClass(QueryNode node)

Returns true iff the specified query node represents the same class as this node.

Parameters:

node - query node to compare

Returns:

true iff the specified query node represents the same class as this node

cloneNode

public QueryNode cloneNode()

Description copied from interface: QueryNode

Clones this node.

Specified by:

cloneNode in interface QueryNode

Returns:

cloned node

equals

public boolean equals(java.lang.Object obj)

hashCode

public int hashCode()

newNode

protected abstract BooleanQueryNode newNode()

Returns a new, empty node of this type.

Returns:

new, empty node of this type