Package kieker.tools.common

Class ParameterEvaluationUtils

java.lang.Object

kieker.tools.common.ParameterEvaluationUtils

public final class ParameterEvaluationUtils
extends Object

Collection of command line parameter evaluation functions.

Since:

1.15

Author:

Reiner Jung

Method Summary

Modifier and Type	Method	Description
static boolean	checkDirectory(File location, String label, com.beust.jcommander.JCommander commander)	Check whether the given handle refers to an existing directory.
static <T> T	createFromConfiguration(Class<T> clazz, Configuration configuration, String key, String errorMessage)	Instantiate on object from a property.
static URL	createURL(String urlString, String label)	Create an URL from a given string.
static boolean	isFileReadable(File file, String label, com.beust.jcommander.JCommander commander)	Check whether a specified file is readable.

Methods inherited from class java.lang.Object

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

Method Details

checkDirectory

public static boolean checkDirectory(File location,
 String label,
 com.beust.jcommander.JCommander commander)

Check whether the given handle refers to an existing directory.

Parameters:

location - path to the directory

label - noun or phrase indicating the parameter of the given location, e.g., "input directory"

commander - command line handler used to plot the usage message

Returns:

returns true if the directory exists, else false

isFileReadable

public static boolean isFileReadable(File file,
 String label,
 com.beust.jcommander.JCommander commander)

Check whether a specified file is readable.

Parameters:

file - the file handle

label - noun or phrase indicating the parameter of the given location, e.g., "configuration file"

commander - command line handler used to plot the usage message

Returns:

true when the file is readable

createURL

public static URL createURL(String urlString,
 String label)

Create an URL from a given string.

Parameters:

urlString - the url string

label - label used to indicate which string

Returns:

returns an URL or null on error

createFromConfiguration

public static <T> T createFromConfiguration(Class<T> clazz,
 Configuration configuration,
 String key,
 String errorMessage)

Instantiate on object from a property.

Type Parameters:

T - class type of the object to be instantiated

Parameters:

clazz - class object for the object to be instantiated

configuration - configuration object containing the class name

key - key of the entry that should contain the a class name

errorMessage - error message in case the object cannot be instantiated

Returns:

returns either an object conforming to the object class or null if the initialization in incomplete