dk.eobjects.metamodel.query
Enum FunctionType

java.lang.Object
  java.lang.Enum<FunctionType>
      dk.eobjects.metamodel.query.FunctionType

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<FunctionType>

public enum FunctionType
extends java.lang.Enum<FunctionType>

Represents an aggregate function to use in a SelectItem.

See Also:

SelectItem

Enum Constant Summary

AVG

COUNT

MAX

MIN

SUM

Method Summary

SelectItem	createSelectItem(Column column)
SelectItem	createSelectItem(java.lang.String expression, java.lang.String alias)
java.lang.Object	evaluate(java.lang.Object... values) Executes the function
static FunctionType	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static FunctionType[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

COUNT

public static final FunctionType COUNT

AVG

public static final FunctionType AVG

SUM

public static final FunctionType SUM

MAX

public static final FunctionType MAX

MIN

public static final FunctionType MIN

Method Detail

values

public static FunctionType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (FunctionType c : FunctionType.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static FunctionType valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

createSelectItem

public SelectItem createSelectItem(Column column)

createSelectItem

public SelectItem createSelectItem(java.lang.String expression,
                                   java.lang.String alias)

evaluate

public java.lang.Object evaluate(java.lang.Object... values)

Executes the function

Parameters:

values - the values to be evaluated. If a value is null it won't be evaluated

Returns:

the result of the function execution. The return type class is dependent on the FunctionType and the values provided. COUNT yields a Long, AVG and SUM yields Double values and MAX and MIN yields the type of the provided values.