com.twelvemonkeys.lang
Class SystemUtil

java.lang.Object
  com.twelvemonkeys.lang.SystemUtil

public final class SystemUtil
extends Object

A utility class with some useful system-related functions.

NOTE: This class is not considered part of the public API and may be changed without notice

Version:

$Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/lang/SystemUtil.java#3 $

Author:

Harald Kuhr, last modified by $Author: haku $

Field Summary

static String	STD_PROPERTIES ".properties"
static String	XML_PROPERTIES ".xml"

Method Summary

static Object	clone(Cloneable pObject)
static boolean	isClassAvailable(String pClassName) Tests if a named class is generally available.
static boolean	isClassAvailable(String pClassName, Class pFromClass) Tests if a named class is available from another class.
static boolean	isFieldAvailable(String pClassName, String pFieldName)
static boolean	isFieldAvailable(String pClassName, String pFieldName, Class pFromClass)
static boolean	isMethodAvailable(String pClassName, String pMethodName)
static boolean	isMethodAvailable(String pClassName, String pMethodName, Class[] pParams)
static boolean	isMethodAvailable(String pClassName, String pMethodName, Class[] pParams, Class pFromClass)
static Properties	loadProperties(Class pClass) Utility method for loading a properties-file for a given class.
static Properties	loadProperties(Class pClass, String pName) Utility method for loading a named properties-file for a class.
static Properties	loadProperties(String pName) Utility method for loading a named properties-file.
static void	main(String[] args)

Methods inherited from class java.lang.Object

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

Field Detail

XML_PROPERTIES

public static String XML_PROPERTIES

".xml"

STD_PROPERTIES

public static String STD_PROPERTIES

".properties"

Method Detail

loadProperties

public static Properties loadProperties(Class pClass,
                                        String pName)
                                 throws IOException

Utility method for loading a named properties-file for a class.

The properties-file is loaded through either:

1. The given class' class loader (from classpath)
2. Or, the system class loader (from classpath)
3. Or, if it cannot be found in the classpath, an attempt to read from the current directory (or full path if given).

Both normal java.util.Properties and com.twelvemonkeys.util.XMLProperties are supported (XML-properties must have ".xml" as its file extension).

Parameters:

pClass - The class to load properties for. If this parameter is null, the method will work exactly as loadProperties(String)

pName - The name of the properties-file. If this parameter is null, the method will work exactly as loadProperties(Class)

Returns:

A Properties mapping read from the given file or for the given class.

Throws:

NullPointerException - if both pName and pClass paramters are null

IOException - if an error occurs during load.

FileNotFoundException - if no properties-file could be found.

See Also:

loadProperties(String), loadProperties(Class), ClassLoader.getResourceAsStream(java.lang.String), ClassLoader.getSystemResourceAsStream(java.lang.String)

loadProperties

public static Properties loadProperties(Class pClass)
                                 throws IOException

Utility method for loading a properties-file for a given class. The properties are searched for on the form "com/package/ClassName.properties" or "com/package/ClassName.xml".

The properties-file is loaded through either:

1. The given class' class loader (from classpath)
2. Or, the system class loader (from classpath)
3. Or, if it cannot be found in the classpath, an attempt to read from the current directory (or full path if given).

Both normal java.util.Properties and com.twelvemonkeys.util.XMLProperties are supported (XML-properties must have ".xml" as its file extension).

Parameters:

pClass - The class to load properties for

Returns:

A Properties mapping for the given class.

Throws:

NullPointerException - if the pClass paramters is null

IOException - if an error occurs during load.

FileNotFoundException - if no properties-file could be found.

See Also:

loadProperties(String), loadProperties(Class, String), ClassLoader.getResourceAsStream(java.lang.String), ClassLoader.getSystemResourceAsStream(java.lang.String)

loadProperties

public static Properties loadProperties(String pName)
                                 throws IOException

Utility method for loading a named properties-file.

The properties-file is loaded through either:

1. The system class loader (from classpath)
2. Or, if it cannot be found in the classpath, an attempt to read from the current directory.

Both normal java.util.Properties and com.twelvemonkeys.util.XMLProperties are supported (XML-properties must have ".xml" as its file extension).

Parameters:

pName - The name of the properties-file.

Returns:

A Properties mapping read from the given file.

Throws:

NullPointerException - if the pName paramters is null

IOException - if an error occurs during load.

FileNotFoundException - if no properties-file could be found.

See Also:

loadProperties(Class), loadProperties(Class, String), ClassLoader.getSystemResourceAsStream(java.lang.String)

clone

public static Object clone(Cloneable pObject)
                    throws CloneNotSupportedException

Throws:

CloneNotSupportedException

main

public static void main(String[] args)
                 throws CloneNotSupportedException

Throws:

CloneNotSupportedException

isClassAvailable

public static boolean isClassAvailable(String pClassName)

Tests if a named class is generally available. If a class is considered available, a call to Class.forName(pClassName) will not result in an exception.

Parameters:

pClassName - the class name to test

Returns:

true if available

isClassAvailable

public static boolean isClassAvailable(String pClassName,
                                       Class pFromClass)

Tests if a named class is available from another class. If a class is considered available, a call to Class.forName(pClassName, true, pFromClass.getClassLoader()) will not result in an exception.

Parameters:

pClassName - the class name to test

pFromClass - the class to test from

Returns:

true if available

isFieldAvailable

public static boolean isFieldAvailable(String pClassName,
                                       String pFieldName)

isFieldAvailable

public static boolean isFieldAvailable(String pClassName,
                                       String pFieldName,
                                       Class pFromClass)

isMethodAvailable

public static boolean isMethodAvailable(String pClassName,
                                        String pMethodName)

isMethodAvailable

public static boolean isMethodAvailable(String pClassName,
                                        String pMethodName,
                                        Class[] pParams)

isMethodAvailable

public static boolean isMethodAvailable(String pClassName,
                                        String pMethodName,
                                        Class[] pParams,
                                        Class pFromClass)