Package org.apache.lucene.queryparser.flexible.core.nodes

Class SlopQueryNode

java.lang.Object

org.apache.lucene.queryparser.flexible.core.nodes.QueryNodeImpl

org.apache.lucene.queryparser.flexible.core.nodes.SlopQueryNode

All Implemented Interfaces:

Cloneable, FieldableNode, QueryNode

public class SlopQueryNode
extends QueryNodeImpl
implements FieldableNode

A SlopQueryNode represents phrase query with a slop.

From Lucene FAQ: Is there a way to use a proximity operator (like near or within) with Lucene? There is a variable called slop that allows you to perform NEAR/WITHIN-like queries. By default, slop is set to 0 so that only exact phrases will match. When using TextParser you can use this syntax to specify the slop: "doug cutting"~2 will find documents that contain "doug cutting" as well as ones that contain "cutting doug".

Field Summary

Fields inherited from class org.apache.lucene.queryparser.flexible.core.nodes.QueryNodeImpl

PLAINTEXT_FIELD_NAME, toQueryStringIgnoreFields

Constructor Summary

Constructors

Constructor	Description
SlopQueryNode(QueryNode query, int value)

Method Summary

Modifier and Type	Method	Description
QueryNode	cloneTree()	Recursive clone the QueryNode tree The tags are not copied to the new tree when you call the cloneTree() method
QueryNode	getChild()
CharSequence	getField()	Returns the field associated to the node and every node under it.
int	getValue()
void	setField(CharSequence fieldName)	Associates the node to a field.
CharSequence	toQueryString(EscapeQuerySyntax escapeSyntaxParser)	convert to a query string understood by the query parser
String	toString()	Every implementation of this class should return pseudo xml like this:

Methods inherited from class org.apache.lucene.queryparser.flexible.core.nodes.QueryNodeImpl

add, add, allocate, clone, containsTag, getChildren, getParent, getTag, getTagMap, isDefaultField, isLeaf, isRoot, removeChildren, removeFromParent, set, setLeaf, setTag, unsetTag

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.lucene.queryparser.flexible.core.nodes.QueryNode

add, add, containsTag, getChildren, getParent, getTag, getTagMap, isLeaf, removeChildren, removeFromParent, set, setTag, unsetTag

Constructor Details

SlopQueryNode

public SlopQueryNode(QueryNode query,
 int value)

Parameters:

query - - QueryNode Tree with the phrase

value - - slop value

Method Details

getChild

public QueryNode getChild()

getValue

public int getValue()

toString

public String toString()

Description copied from class: QueryNodeImpl

Every implementation of this class should return pseudo xml like this:

For FieldQueryNode: <field start='1' end='2' field='subject' text='foo'/>

Specified by:

toString in interface QueryNode

Overrides:

toString in class QueryNodeImpl

See Also:

• QueryNode.toString()

toQueryString

public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser)

Description copied from interface: QueryNode

convert to a query string understood by the query parser

Specified by:

toQueryString in interface QueryNode

cloneTree

public QueryNode cloneTree()
                    throws CloneNotSupportedException

Description copied from interface: QueryNode

Recursive clone the QueryNode tree The tags are not copied to the new tree when you call the cloneTree() method

Specified by:

cloneTree in interface QueryNode

Overrides:

cloneTree in class QueryNodeImpl

Returns:

the cloned tree

Throws:

CloneNotSupportedException

getField

public CharSequence getField()

Description copied from interface: FieldableNode

Returns the field associated to the node and every node under it.

Specified by:

getField in interface FieldableNode

Returns:

the field name

setField

public void setField(CharSequence fieldName)

Description copied from interface: FieldableNode

Associates the node to a field.

Specified by:

setField in interface FieldableNode

Parameters:

fieldName - the field name