de.unidu.is.retrieval
Class QueryCondition

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

All Implemented Interfaces:

QueryNode

Direct Known Subclasses:

WeightedQueryCondition

public class QueryCondition

extends java.lang.Object

implements QueryNode

A single query condition.

Since:

2004-04-12

Version:

$Revision: 1.8 $, $Date: 2005/02/28 22:27:55 $

Author:

Henrik Nottelmann

Field Summary

protected java.lang.String	operator An operator used for retrieval.
protected java.lang.String	path An XPath expression or an alias.
protected java.lang.String	value A comparison value.

Constructor Summary

QueryCondition()
Creates a new, empty object.

QueryCondition(java.lang.String condition)
Creates a new object by parsing the XIRQL condition string.

QueryCondition(java.lang.String path, java.lang.String operator, java.lang.String value)
Creates a new object.

Method Summary

QueryNode	cloneNode() Clones this node.
boolean	equals(java.lang.Object obj)
java.lang.String	getOperator() Returns the operator.
java.lang.String	getPath() Returns the path.
java.lang.String	getValue() Returns the value.
int	hashCode()
boolean	isDF() Returns true iff the node is in disjunctive form.
java.util.Iterator	iterator() Returns an iterator over the children of this node.
protected void	parse(java.lang.String condition) Fills this instance by parsing the XIRQL condition string.
void	setOperator(java.lang.String operator) Sets the operator.
void	setPath(java.lang.String path) Sets the path.
void	setValue(java.lang.String value) Sets the value.
QueryNode	simplifiedNode() Simplifies this node.
QueryNode	toDF() Converts the node and its subtree into disjunctive form.
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

Field Detail

path

protected java.lang.String path

An XPath expression or an alias.

operator

protected java.lang.String operator

An operator used for retrieval.

value

protected java.lang.String value

A comparison value.

Constructor Detail

QueryCondition

public QueryCondition()

Creates a new, empty object.

QueryCondition

public QueryCondition(java.lang.String condition)

Creates a new object by parsing the XIRQL condition string.

Parameters:

condition - XIRQL condition string

QueryCondition

public QueryCondition(java.lang.String path,
                      java.lang.String operator,
                      java.lang.String value)

Creates a new object.

Parameters:

path - path

operator - name

value - comparison value

Method Detail

parse

protected void parse(java.lang.String condition)

Fills this instance by parsing the XIRQL condition string.

Parameters:

condition - XIRQL condition string

getOperator

public java.lang.String getOperator()

Returns the operator.

Returns:

operator.

setOperator

public void setOperator(java.lang.String operator)

Sets the operator.

Parameters:

operator - operator to set.

getPath

public java.lang.String getPath()

Returns the path.

Returns:

path.

setPath

public void setPath(java.lang.String path)

Sets the path.

Parameters:

path - path to set.

getValue

public java.lang.String getValue()

Returns the value.

Returns:

value.

setValue

public void setValue(java.lang.String value)

Sets the value.

Parameters:

value - value to set.

equals

public boolean equals(java.lang.Object obj)

hashCode

public int hashCode()

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

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)

toDF

public QueryNode toDF()

Description copied from interface: QueryNode

Converts the node and its subtree into disjunctive form.

Specified by:

toDF in interface QueryNode

Returns:

node in disjunctive form (or this node, if no simplication is required)

isDF

public boolean isDF()

Description copied from interface: QueryNode

Returns true iff the node is in disjunctive form.

Specified by:

isDF in interface QueryNode

Returns:

true iff the node is in disjunctive form

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

cloneNode

public QueryNode cloneNode()

Description copied from interface: QueryNode

Clones this node.

Specified by:

cloneNode in interface QueryNode

Returns:

cloned node