ice.util
Class Defs

java.lang.Object
  ice.util.Defs

public class Defs

extends Object

Field Summary

static byte[]	EMPTY_BYTE_ARRAY
static char[]	EMPTY_CHAR_ARRAY
static int[]	EMPTY_INT_ARRAY
static long[]	EMPTY_LONG_ARRAY
static Object[]	EMPTY_OBJECT_ARRAY
static String	EMPTY_STRING
static String[]	EMPTY_STRING_ARRAY
static Object	NO_SYNCHRONIZATION Useful tag to explicitly indicate intention not to use any synchronization object locks instead of simply writing null when applicable
static Object	NOT_FOUND Usefull tag to distinguish null value and value absence

Constructor Summary

Defs()

Method Summary

static void	badArg() Convinient method to throw IllegalArgumentException
static boolean	booleanProperty(String name) Shortcut for booleanProperty(name, false)
static boolean	booleanProperty(String name, boolean defaultValue) If security manager allow access to the system property name and it exists, then return true if it is set to yes, true and false if set to no, false.
static Class	getClass(String className) Utility to return result of Class.forName(className) or null if it throws ClassNotFoundException or SecurityException
static Method	getMethod(Class sourceClass, String name, Class[] signature) Utility to return result of sourceClass.getMethod(name, signature) or null if it throws NoSuchMethodException or SecurityException
static Method	getMethod(String className, String name, Class[] signature) Utility to return result of Class.forName(className).getMethod(name, signature) or null if it throws exceptions
static int	intProperty(String name, int defaultValue) Return value for system property name parsed as int or defaultValue if the property does not exist or a security manager denies access to it
static Object	newClassInstance(Class cl) Utility to return result of cl.newInstance() or null if it throws IllegalAccessException, InstantiationException, LinkageError or SecurityException
static Object	newClassInstance(String className)
static Object[]	newObjectArray(int size) Utility shortcut for:
static String	property(String name) Equivalent to property(name, null)
static String	property(String name, String defaultValue) Return value for system property name or defaultValue if the property does not exist or a security manager denies access to it
static void	setProperty(String property, String value) Set system property to value.
static void	setSandBoxEnabled()
static void	setSystemProperty(String name, String value) Set system property to value.
static String	sysProperty(String name) Alias to property(String name)
static String	sysProperty(String name, String defaultValue) Alias to property(String name, String defaultValue)
static boolean	sysPropertyBoolean(String name) Alias to booleanProperty(String name)
static boolean	sysPropertyBoolean(String name, boolean defaultValue) Alias to booleanProperty(String name, boolean defaultValue)
static int	sysPropertyInt(String name, int defaultValue) Alias to intProperty(String name, int defaultValue)

Methods inherited from class java.lang.Object

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

Field Detail

NOT_FOUND

public static final Object NOT_FOUND

Usefull tag to distinguish null value and value absence

NO_SYNCHRONIZATION

public static final Object NO_SYNCHRONIZATION

Useful tag to explicitly indicate intention not to use any synchronization object locks instead of simply writing null when applicable

EMPTY_STRING

public static final String EMPTY_STRING

See Also:

Constant Field Values

EMPTY_BYTE_ARRAY

public static final byte[] EMPTY_BYTE_ARRAY

EMPTY_CHAR_ARRAY

public static final char[] EMPTY_CHAR_ARRAY

EMPTY_INT_ARRAY

public static final int[] EMPTY_INT_ARRAY

EMPTY_LONG_ARRAY

public static final long[] EMPTY_LONG_ARRAY

EMPTY_OBJECT_ARRAY

public static final Object[] EMPTY_OBJECT_ARRAY

EMPTY_STRING_ARRAY

public static final String[] EMPTY_STRING_ARRAY

Constructor Detail

Defs

public Defs()

Method Detail

newObjectArray

public static Object[] newObjectArray(int size)

Utility shortcut for:

    (size != 0) ? new Object[size] : Defs.EMPTY_OBJECT_ARRAY;
 

property

public static String property(String name)

Equivalent to property(name, null)

property

public static String property(String name,
                              String defaultValue)

Return value for system property name or defaultValue if the property does not exist or a security manager denies access to it

intProperty

public static int intProperty(String name,
                              int defaultValue)

Return value for system property name parsed as int or defaultValue if the property does not exist or a security manager denies access to it

booleanProperty

public static boolean booleanProperty(String name)

Shortcut for booleanProperty(name, false)

booleanProperty

public static boolean booleanProperty(String name,
                                      boolean defaultValue)

If security manager allow access to the system property name and it exists, then return true if it is set to yes, true and false if set to no, false. Otherwise returns defaultValue

sysProperty

public static String sysProperty(String name)

Alias to property(String name)

sysProperty

public static String sysProperty(String name,
                                 String defaultValue)

Alias to property(String name, String defaultValue)

sysPropertyInt

public static int sysPropertyInt(String name,
                                 int defaultValue)

Alias to intProperty(String name, int defaultValue)

sysPropertyBoolean

public static boolean sysPropertyBoolean(String name)

Alias to booleanProperty(String name)

sysPropertyBoolean

public static boolean sysPropertyBoolean(String name,
                                         boolean defaultValue)

Alias to booleanProperty(String name, boolean defaultValue)

setProperty

public static void setProperty(String property,
                               String value)

Set system property to value. If SecurityManager denies property modification, silently ignore property change

setSandBoxEnabled

public static void setSandBoxEnabled()

setSystemProperty

public static void setSystemProperty(String name,
                                     String value)

Set system property to value. If SecurityManager denies property modification, print debug trace

getClass

public static Class getClass(String className)

Utility to return result of Class.forName(className) or null if it throws ClassNotFoundException or SecurityException

newClassInstance

public static Object newClassInstance(Class cl)

Utility to return result of cl.newInstance() or null if it throws IllegalAccessException, InstantiationException, LinkageError or SecurityException

newClassInstance

public static Object newClassInstance(String className)

getMethod

public static Method getMethod(Class sourceClass,
                               String name,
                               Class[] signature)

Utility to return result of sourceClass.getMethod(name, signature) or null if it throws NoSuchMethodException or SecurityException

getMethod

public static Method getMethod(String className,
                               String name,
                               Class[] signature)

Utility to return result of Class.forName(className).getMethod(name, signature) or null if it throws exceptions

badArg

public static void badArg()
                   throws IllegalArgumentException

Convinient method to throw IllegalArgumentException

Throws:

IllegalArgumentException