com.orientechnologies.orient.core.sql.functions.misc

Class OSQLStaticReflectiveFunction

java.lang.Object

com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

com.orientechnologies.orient.core.sql.functions.misc.OSQLStaticReflectiveFunction

All Implemented Interfaces:

OSQLFunction

public class OSQLStaticReflectiveFunction
extends OSQLFunctionAbstract

This OSQLFunction is able to invoke a static method using reflection. If contains more than one Method it tries to pick the one that better fits the input parameters.

Author:

Fabrizio Fortino

Field Summary

Fields inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

maxParams, minParams, name

Constructor Summary

Constructors

Constructor and Description
OSQLStaticReflectiveFunction(String name, int minParams, int maxParams, Method... methods)

Method Summary

Modifier and Type	Method and Description
Object	execute(Object iThis, OIdentifiable iCurrentRecord, Object iCurrentResult, Object[] iParams, OCommandContext iContext) Process a record.
String	getSyntax() Returns a convenient SQL String representation of the function.

Methods inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

aggregateResults, config, filterResult, getDistributedStorageId, getMaxParams, getMinParams, getName, getResult, getSingleItem, getSingleProperty, mergeDistributedResult, returnDistributedResult, setResult, shouldMergeDistributedResult, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

OSQLStaticReflectiveFunction

public OSQLStaticReflectiveFunction(String name,
                                    int minParams,
                                    int maxParams,
                                    Method... methods)

Method Detail

execute

public Object execute(Object iThis,
                      OIdentifiable iCurrentRecord,
                      Object iCurrentResult,
                      Object[] iParams,
                      OCommandContext iContext)

Description copied from interface: OSQLFunction

Process a record.

iCurrentRecord - : current record

iCurrentResult - TODO

iParams - : function parameters, number is ensured to be within minParams and maxParams.

iContext - : object calling this function

Returns:

function result, can be null. Special cases : can be null if function aggregate results, can be null if function filter results : this mean result is excluded

getSyntax

public String getSyntax()

Description copied from interface: OSQLFunction

Returns a convenient SQL String representation of the function.

Example :

  myFunction( param1, param2, [optionalParam3])
 

This text will be used in exception messages.

Returns:

String , never null.