Package org.h2.schema

Class FunctionAlias.JavaMethod

java.lang.Object

org.h2.schema.FunctionAlias.JavaMethod

All Implemented Interfaces:

java.lang.Comparable<FunctionAlias.JavaMethod>

Enclosing class:

FunctionAlias

public static class FunctionAlias.JavaMethod
extends java.lang.Object
implements java.lang.Comparable<FunctionAlias.JavaMethod>

There may be multiple Java methods that match a function name. Each method must have a different number of parameters however. This helper class represents one such method.

Field Summary

Fields

Modifier and Type	Field	Description
private TypeInfo	dataType
private boolean	hasConnectionParam
private int	id
private java.lang.reflect.Method	method
private int	paramCount
private java.lang.Class<?>	varArgClass
private boolean	varArgs

Constructor Summary

Constructors

Constructor	Description
JavaMethod(java.lang.reflect.Method method, int id)

Method Summary

Modifier and Type	Method	Description
int	compareTo(FunctionAlias.JavaMethod m)
private java.lang.Object	execute(SessionLocal session, Expression[] args, boolean columnList)
java.lang.Class<?>[]	getColumnClasses()
TypeInfo	getDataType()	Returns data type information for regular functions or null for table value functions.
int	getParameterCount()
ResultInterface	getTableValue(SessionLocal session, Expression[] args, boolean columnList)	Call the table user-defined function and return the value.
Value	getValue(SessionLocal session, Expression[] args, boolean columnList)	Call the user-defined function and return the value.
boolean	hasConnectionParam()	Check if this function requires a database connection.
boolean	isVarArgs()
static ResultInterface	resultSetToResult(SessionLocal session, java.sql.ResultSet rs, int maxrows)	Create a result for the given result set.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

id

private final int id

method

private final java.lang.reflect.Method method

dataType

private final TypeInfo dataType

hasConnectionParam

private boolean hasConnectionParam

varArgs

private boolean varArgs

varArgClass

private java.lang.Class<?> varArgClass

paramCount

private int paramCount

Constructor Detail

JavaMethod

JavaMethod(java.lang.reflect.Method method,
           int id)

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

hasConnectionParam

public boolean hasConnectionParam()

Check if this function requires a database connection.

Returns:

if the function requires a connection

getValue

public Value getValue(SessionLocal session,
                      Expression[] args,
                      boolean columnList)

Call the user-defined function and return the value.

Parameters:

session - the session

args - the argument list

columnList - true if the function should only return the column list

Returns:

the value

getTableValue

public ResultInterface getTableValue(SessionLocal session,
                                     Expression[] args,
                                     boolean columnList)

Call the table user-defined function and return the value.

Parameters:

session - the session

args - the argument list

columnList - true if the function should only return the column list

Returns:

the value

resultSetToResult

public static ResultInterface resultSetToResult(SessionLocal session,
                                                java.sql.ResultSet rs,
                                                int maxrows)

Create a result for the given result set.

Parameters:

session - the session

rs - the result set

maxrows - the maximum number of rows to read (0 to just read the meta data)

Returns:

the value

execute

private java.lang.Object execute(SessionLocal session,
                                 Expression[] args,
                                 boolean columnList)

getColumnClasses

public java.lang.Class<?>[] getColumnClasses()

getDataType

public TypeInfo getDataType()

Returns data type information for regular functions or null for table value functions.

Returns:

data type information for regular functions or null for table value functions

getParameterCount

public int getParameterCount()

isVarArgs

public boolean isVarArgs()

compareTo

public int compareTo(FunctionAlias.JavaMethod m)

Specified by:

compareTo in interface java.lang.Comparable<FunctionAlias.JavaMethod>