it.tidalwave.util

Class Parameters

java.lang.Object

it.tidalwave.util.Parameters

public final class Parameters
extends Object

This class provides a few static utility methods to extracts parameters from an array.

Version:

$Id$

Author:

Fabrizio Giudici

Status: stable API

Method Summary

Methods

Modifier and Type	Method and Description
static void	checkNonNull(Object parameter, String name)
static <T,O> Collection<T>	find(Class<T> parameterClass, O... parameters) Extracts multiple-value parameters of the given type from an array.
static <T,O> T	find(Class<T> parameterClass, T defaultOption, O... parameters) Extracts a singled-value parameter of the given type from an array.

Methods inherited from class java.lang.Object

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

Method Detail

checkNonNull

public static void checkNonNull(@CheckForNull
                Object parameter,
                @Nonnull
                String name)
                         throws IllegalArgumentException

Throws:

IllegalArgumentException

find

@CheckForNull
public static <T,O> T find(@Nonnull
                        Class<T> parameterClass,
                        @CheckForNull
                        T defaultOption,
                        @Nonnull
                        O... parameters)
              throws IllegalArgumentException

Extracts a singled-value parameter of the given type from an array. If the parameter is not found, the default value is returned. If more than a single parameter is found, an IllegalparameterException is thrown.

Parameters:

parameterClass - the class of the parameter to retrieve

defaultOption - the default value of the parameter

parameters - the array of parameters

Throws:

IllegalparameterException - if more than a single value is found

IllegalArgumentException

find

@Nonnull
public static <T,O> Collection<T> find(@Nonnull
                               Class<T> parameterClass,
                               @Nonnull
                               O... parameters)

Extracts multiple-value parameters of the given type from an array. If the parameter is not found, an empty collection is returned.

Parameters:

parameterClass - the class of the parameter to retrieve

parameters - the array of parameters