Package org.apache.solr.search.function

Class NvlValueSourceParser

java.lang.Object

org.apache.solr.search.ValueSourceParser

org.apache.solr.search.function.NvlValueSourceParser

All Implemented Interfaces:

org.apache.solr.util.plugin.NamedListInitializedPlugin

public class NvlValueSourceParser
extends org.apache.solr.search.ValueSourceParser

A sample ValueSourceParser for testing. Approximates the oracle NVL function, letting you substitute a value when a "null" is encountered. In this case, null is approximated by a float value, since ValueSource always returns a float, even if the field is undefined for a document.

Initialization parameters: - nvlFloatValue: float value to consider as "NULL" when seen in a field. defaults to 0.0f.

Example: nvl(vs,2) will return 2 if the vs is NULL (as defined by nvlFloatValue above) or the doc value otherwise

Field Summary

Fields inherited from class org.apache.solr.search.ValueSourceParser

standardValueSourceParsers

Constructor Summary

Constructors

Constructor	Description
NvlValueSourceParser()

Method Summary

Modifier and Type	Method	Description
void	init(org.apache.solr.common.util.NamedList<?> args)
org.apache.lucene.queries.function.ValueSource	parse(org.apache.solr.search.FunctionQParser fp)

Methods inherited from class java.lang.Object

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

Constructor Detail

NvlValueSourceParser

public NvlValueSourceParser()

Method Detail

parse

public org.apache.lucene.queries.function.ValueSource parse(org.apache.solr.search.FunctionQParser fp)
                                                     throws org.apache.solr.search.SyntaxError

Specified by:

parse in class org.apache.solr.search.ValueSourceParser

Throws:

org.apache.solr.search.SyntaxError

init

public void init(org.apache.solr.common.util.NamedList<?> args)