Class CommonConstants

java.lang.Object

org.tquadrat.foundation.lang.CommonConstants

@ClassVersion(sourceVersion="$Id: CommonConstants.java 1151 2025-10-01 21:32:15Z tquadrat $")
@UtilityClass
public final class CommonConstants
extends Object

This class provides a bunch of commonly used constants.

The constants are arranged into several categories.

• Physical constants like gravity and speed of light.
• XML constants, like often used names for entities and attributes.
• Miscellaneous constants like the empty string or the null char.

Author:

Thomas Thrien (thomas.thrien@tquadrat.org)

Version:

$Id: CommonConstants.java 1151 2025-10-01 21:32:15Z tquadrat $

Since:

0.0.5

UML Diagram

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UML Diagram for "org.tquadrat.foundation.lang.CommonConstants"

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Field Summary

Fields

Modifier and Type	Field	Description
static final Charset	ASCII	The reference to the ASCII character set.
static final String	CDATA_LEADIN	The lead-in for a CDATA wrapped String: "<![CDATA["
static final String	CDATA_LEADOUT	The lead-out for a CDATA wrapped String: "]]>"
static final char	CHAR_ELLIPSIS	The horizontal ellipsis: … (&hellip;/&#8230;/&#x2026;/…).
static final char	CHAR_HYPHEN	The hyphen character (&#8208;/&#x2010;/‐/HYPHEN). This is different from the character '-' (HYPHEN-MINUS), although it looks similar.
static final char	CHAR_NBSP	The non-breaking space character (&#x00A0;/ ).
static final char	CHAR_NNBSP	The small non-breaking space character (&#x202F;/ ).
static final char	CHAR_ZWNBSP	The zero-width non-breaking space character; in fact, the 'word joiner' character that should be used instead of the original character.
static final String	CR	The line terminator as defined by the underlying operating system.
static final char	DECIMAL_SEPARATOR	The decimal separator for the current locale.
static final String	DEFAULT_APPLICATION_ID	The default application id if nothing else could be used: "Default Program Main".
static final CharSequence	EMPTY_CHARSEQUENCE	An empty char sequence.
static final Object[]	EMPTY_Object_ARRAY	An empty array of Object objects.
static final String	EMPTY_STRING	The empty string.
static final String[]	EMPTY_String_ARRAY	An empty array of String instances.
static final String	ENV_JAVA_HOME	The Java installation directory: "JAVA_HOME".
static final int	EOF	The End-Of-File marker for streams: -1.
static final BigDecimal	GRAVITY_CONSTANT	The Gravity constant: 6.672E-11 (N * m2)/(kg2).
static final Predicate<? extends Object>	IS_NULL	Returns true if the provided reference is null otherwise returns false.
static final Charset	ISO8859_1	The reference to the ISO-8859-1 character set.
static final Predicate<? extends Object>	NON_NULL	Returns true if the provided reference is non-null otherwise returns false.
static final int	NOT_FOUND	The index value indicating that nothing was found: -1.
static final String	NUL	A String containing only NUL (the NULL_CHAR).
static final char	NULL_CHAR	The null character.
static final String	NULL_STRING	A String containing the sequence "null".
static final String	PROPERTY_APPLICATIONID	The system property for the application id as used by the logging sub-system: "org.tquadrat.logging.applicationId".
static final String	PROPERTY_CLASSPATH	The vested system property for the current class path: "java.class.path".
static final String	PROPERTY_CPUARCHITECTURE	The vested system property for the architecture of the current CPU: "os.arch".
static final String	PROPERTY_FILE_ENCODING	The vested system property for the file encoding used by the JVM: "file.encoding".
static final String	PROPERTY_HEADLESS	The system property providing the flag that indicates whether the program is running in a headless mode, meaning that is does not have any kind of a graphical user interface: "java.awt.headless".
static final String	PROPERTY_IS_DEBUG	The system property that is used to enable the debug mode: "isDebug".
static final String	PROPERTY_IS_TEST	The system property that is used to enable the test mode: "isTest".
static final String	PROPERTY_JAVA_HOME	The vested system property for the Java installation directory: "java.home".
static final String	PROPERTY_JAVA_RUNTIME	The system property for the name of the Java runtime: "java.runtime.name".
static final String	PROPERTY_JAVA_VENDOR	The vested system property for the Java vendor: "java.vendor".
static final String	PROPERTY_JAVA_VENDOR_URL	The vested system property for the homepage URL of the Java vendor: "java.vendor.url".
static final String	PROPERTY_JAVA_VERSION	The vested system property for the Java version: "java.version".
static final String	PROPERTY_JVM_NAME	The vested system property for the name of the current JVM: "java.vm.name".
static final String	PROPERTY_JVM_VENDOR	The vested system property for the name of the vendor for the current JVM: "java.vm.vendor".
static final String	PROPERTY_JVM_VERSION	The vested system property for the version of the current JVM: "java.vm.version".
static final String	PROPERTY_LINE_SEPARATOR	The vested system property for the line separator: "line.separator".
static final String	PROPERTY_LOGGING_CONFIG_CLASS	The optional system property for the name of the class that provides the configuration the JDK logger: "java.util.logging.config.class".
static final String	PROPERTY_LOGGING_CONFIG_FILE	The optional system property for the name of the configuration file for the JDK logger: "java.util.logging.config.file".
static final String	PROPERTY_MAIL_SESSION_DEBUG	The optional system property for enabling java mail session debug: "javax.mail.Session.debug".
static final String	PROPERTY_MODULEPATH	The (vested [?])
static final String	PROPERTY_NET_PROTOCOL_PKGS	The system property for the name of the packages with URL protocol handlers: "java.protocol.handler.pkgs".
static final String	PROPERTY_OSNAME	The vested system property for the name of the current operating system: "os.name".
static final String	PROPERTY_OSVERSION	The vested system property for the version of the current operating system: "os.version".
static final String	PROPERTY_PREFS_ROOT_SYSTEM	The system property for the location of the system preferences files on a UNIX/Linux system: "java.util.prefs.systemRoot". If not set, the location is /etc/, resulting to /etc/.java/.systemPrefs. If the default location is used, the respective folder has to be created by a user with root permissions; the files in there should have the rights 544, while the folder and its sub-folders should have 755.
static final String	PROPERTY_PREFS_ROOT_USER	The system property for the location of the user preferences files on a UNIX/Linux system: "java.util.prefs.userRoot". If not set, the location is ~/, resulting to ~/.java/.userPrefs/.
static final String	PROPERTY_PREFS_SYNC	The system property for the synchronisation interval of the preferences on a UNIX/Linux system, in seconds: "java.util.prefs.syncInterval". If not set, the interval is 30 seconds.
static final String	PROPERTY_RESOURCEBUNDLE_ENCODING	The system property that is used to force the encoding for a PropertyResourceBundle: "java.util.PropertyResourceBundle.encoding".
static final String	PROPERTY_SAX_PARSER_FACTORY	The system property for the class name of the SAX XML parser factory: "javax.xml.parsers.SAXParserFactory".
static final String	PROPERTY_SSL_KEYSTORE	The system property for the name of the file with the SSL key store: "javax.net.ssl.keyStore".
static final String	PROPERTY_SSL_KEYSTORE_PASSWORD	The system property for the password for the SSL key store: "javax.net.ssl.keyStorePassword".
static final String	PROPERTY_TEMPFOLDER	The vested system property for the name of the temp folder that is used by the current user: "java.io.tmpdir".
static final String	PROPERTY_USER_COUNTRY	The system property for the country code setting for the current user: "user.country".
static final String	PROPERTY_USER_DIR	The vested system property for the name of the current working directory of the current user: "user.dir".
static final String	PROPERTY_USER_HOME	The vested system property for the name of the home directory of the current user: "user.home".
static final String	PROPERTY_USER_LANG	The system property for the language code setting the current user: "user.language".
static final String	PROPERTY_USER_NAME	The vested system property for the name of the current user: "user.name".
static final String	PROPERTY_USER_TIMEZONE	The system property for the time zone setting the current user: "user.timezone".
static final BigDecimal	SPEED_OF_LIGHT	The speed of light in km per second = 299792.458 km/s.
static final BigDecimal	STANDARD_G	The value for 1 G: 9.80665 m/(s2)
static final char	THOUSANDS_SEPARATOR	The grouping separator for the current locale, used with large numbers to separate thousands.
static final String	THREADGROUP_MAIN	The name of the main thread group: "main". This is the group of the main thread.
static final String	THREADGROUP_SYSTEM	The name of the system thread group: "system". This is the group of several system threads and the parent thread group for the main thread group.
static final long	TIME_DELTA_BEGINGREGORIAN2BEGINEPOCH	The time between 1582-10-15T00:00 (the start of the Gregorian calendar) and 1970-01-01T00:00 (the beginning of the "Epoch") in seconds: 12219292800L.
static final BigDecimal	TROPICAL_YEAR	The length of a (tropical) year in days, according to SI: 365.242190517 d.
static final String	UNKNOWN_STRING	A String containing the sequence "<UNKNOWN>".
static final Charset	US_ASCII	The reference to the US-ASCII character set; this is the same as the ASCII character set.
static final TimeZone	UTC	Deprecated, for removal: This API element is subject to removal in a future version. As the java.util.Date API is now obsolete, also the related classes, like java.util.TimeZone should be used no longer.
static final Charset	UTF8	The reference to the UTF-8 character set.
static final String	XMLATTRIBUTE_Category	The attribute name for an XML attribute holding a category of something: "category".
static final String	XMLATTRIBUTE_Class	The attribute name for an XML attribute holding a class name: "class".
static final String	XMLATTRIBUTE_Date	The attribute name for an XML attribute holding a date, usually without the time information: "date".
static final String	XMLATTRIBUTE_File	The attribute name for an XML attribute holding a file name: "file".
static final String	XMLATTRIBUTE_Id	The attribute name for the XML id attribute: "xml:id".
static final String	XMLATTRIBUTE_IdRef	The attribute name for the XML idref attribute: "idref".
static final String	XMLATTRIBUTE_Language	The attribute name for the XML language attribute: "xml:lang".
static final String	XMLATTRIBUTE_Name	The attribute name for the XML name attribute: "name". Only names that follow exact rules for their character set can be stored in XML attributes, but free names have to be stored as XML elements.
static final String	XMLATTRIBUTE_NodeId	The name for the node id XML attribute: "node".
static final String	XMLATTRIBUTE_PID	The name for the PID XML attribute: "pid".
static final String	XMLATTRIBUTE_Reference	The name for the reference XML attribute: "reference".
static final String	XMLATTRIBUTE_SequenceNumber	The name for the sequence number XML attribute: "sequenceNumber".
static final String	XMLATTRIBUTE_Status	The name for the status XML attribute: "status".
static final String	XMLATTRIBUTE_Time	The attribute name for an XML attribute holding a time, usually without the date information: "time".
static final String	XMLATTRIBUTE_Timestamp	The name for an XML attribute holding a date/time: "timestamp".
static final String	XMLATTRIBUTE_Type	The name for an XML attribute holding a type, in the sense of a category or model, and usually not in the sense this term is used in the context of programming languages: "type".
static final String	XMLATTRIBUTE_UserId	The name for the user id XML attribute: "userId".
static final String	XMLATTRIBUTE_Version	The name for the version XML attribute: "version".
static final String	XMLATTRIBUTE_Whitespace	The attribute name for the XML space attribute: "xml:space".
static final String	XMLELEMENT_Comment	The element name for an XML element representing a comment: "comment". This is not an XML comment (they will be written as <!
static final String	XMLELEMENT_Date	The element name for an XML element holding a date, usually without the time information: "date".
static final String	XMLELEMENT_Description	The element name for an XML element representing a description of some kind: "description".
static final String	XMLELEMENT_Message	The element name for an XML element containing a message: "message".
static final String	XMLELEMENT_Name	The element name for an XML element representing a name of some kind: "name". Only names that follow exact rules for their character set can be stored in XML attributes, but free names have to be stored as XML elements.
static final String	XMLELEMENT_Text	The element name for an XML element holding text: "text".
static final String	XMLELEMENT_Time	The element name for an XML element holding a time, usually without the date information: "time".
static final String	XMLELEMENT_Timestamp	The name for an XML element holding a date/time: "timestamp".
static final ZoneId	ZONE_UTC	Deprecated. Use ZoneOffset.UTC instead.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	CommonConstants()	No instance of this class is allowed.

Method Summary

Methods inherited from class Object

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

Field Details

CHAR_ELLIPSIS

@API(status=STABLE,
     since="0.0.5")
public static final char CHAR_ELLIPSIS

The horizontal ellipsis: … (…/…/…/…).

See Also:

• Constant Field Values

CHAR_HYPHEN

@API(status=STABLE,
     since="0.0.5")
public static final char CHAR_HYPHEN

The hyphen character (‐/‐/‐/HYPHEN).

This is different from the character '-' (HYPHEN-MINUS), although it looks similar. This character can be used as a replacement for the HYPHEN-MINUS in contexts where HYPHEN-MINUS has a special meaning.

See Also:

• Constant Field Values

CHAR_NBSP

@API(status=STABLE,
     since="0.0.5")
public static final char CHAR_NBSP

The non-breaking space character ( / ).

See Also:

• Constant Field Values

CHAR_NNBSP

@API(status=STABLE,
     since="0.0.5")
public static final char CHAR_NNBSP

The small non-breaking space character ( / ).

See Also:

• Constant Field Values

CHAR_ZWNBSP

@API(status=STABLE,
     since="0.0.5")
public static final char CHAR_ZWNBSP

The zero-width non-breaking space character; in fact, the 'word joiner' character that should be used instead of the original character.

See Also:

• Constant Field Values

EMPTY_Object_ARRAY

@API(status=STABLE,
     since="0.0.5")
public static final Object[] EMPTY_Object_ARRAY

An empty array of Object objects.

EMPTY_String_ARRAY

@API(status=STABLE,
     since="0.0.5")
public static final String[] EMPTY_String_ARRAY

An empty array of String instances.

GRAVITY_CONSTANT

@API(status=STABLE,
     since="0.0.5")
public static final BigDecimal GRAVITY_CONSTANT

The Gravity constant: 6.672E-11 (N * m²)/(kg²). An alternative unit for the constant is (m³)/(kg * s²).

SPEED_OF_LIGHT

@API(status=STABLE,
     since="0.0.5")
public static final BigDecimal SPEED_OF_LIGHT

The speed of light in km per second = 299792.458 km/s.

STANDARD_G

@API(status=STABLE,
     since="0.0.5")
public static final BigDecimal STANDARD_G

The value for 1 G: 9.80665 m/(s²)

TIME_DELTA_BEGINGREGORIAN2BEGINEPOCH

@API(status=STABLE,
     since="0.0.5")
public static final long TIME_DELTA_BEGINGREGORIAN2BEGINEPOCH

The time between 1582-10-15T00:00 (the start of the Gregorian calendar) and 1970-01-01T00:00 (the beginning of the "Epoch") in seconds: 12219292800L.

This constant is used for example to determine the number of nanoseconds since the beginning of the Gregorian calendar, and that is used to create UUIDs based on time and location.

See Also:

• UUID
• Constant Field Values

TROPICAL_YEAR

@API(status=STABLE,
     since="0.0.5")
public static final BigDecimal TROPICAL_YEAR

The length of a (tropical) year in days, according to SI: 365.242190517 d.

ENV_JAVA_HOME

@API(status=STABLE,
     since="0.0.5")
public static final String ENV_JAVA_HOME

The Java installation directory: "JAVA_HOME".

See Also:

• PROPERTY_JAVA_HOME
• Constant Field Values

PROPERTY_APPLICATIONID

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_APPLICATIONID

The system property for the application id as used by the logging sub-system: "org.tquadrat.logging.applicationId".

For details on this refer to the project logging.

See Also:

• Constant Field Values

PROPERTY_CLASSPATH

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_CLASSPATH

The vested system property for the current class path: "java.class.path".

See Also:

• Constant Field Values

PROPERTY_CPUARCHITECTURE

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_CPUARCHITECTURE

The vested system property for the architecture of the current CPU: "os.arch".

See Also:

• Constant Field Values

PROPERTY_FILE_ENCODING

@API(status=STABLE,
     since="0.0.6")
public static final String PROPERTY_FILE_ENCODING

The vested system property for the file encoding used by the JVM: "file.encoding".

See Also:

• Constant Field Values

PROPERTY_HEADLESS

@API(status=STABLE,
     since="0.1.0")
public static final String PROPERTY_HEADLESS

The system property providing the flag that indicates whether the program is running in a headless mode, meaning that is does not have any kind of a graphical user interface: "java.awt.headless".

Instead of checking the property directly, a call to java.awt.GraphicsEnvironment#isHeadless() will return the same result, but it would require to add the module java.desktop to the dependencies of the current module.

JavaFX does not have a headless mode as such (although there are several solutions for headless testing of JavaFX applications), but this flag can still be used to decide whether a JavaFX can run or not: basically, AWT, Swing and JavaFX need the same resources, a keyboard, a mouse and a graphical display.

See Also:

• Using Headless Mode in the Java SE Platform
• Constant Field Values

PROPERTY_IS_DEBUG

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_IS_DEBUG

The system property that is used to enable the debug mode: "isDebug".

See Also:

• Constant Field Values

PROPERTY_IS_TEST

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_IS_TEST

The system property that is used to enable the test mode: "isTest".

See Also:

• Constant Field Values

PROPERTY_JAVA_HOME

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_JAVA_HOME

The vested system property for the Java installation directory: "java.home".

See Also:

• Constant Field Values

PROPERTY_JAVA_RUNTIME

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_JAVA_RUNTIME

The system property for the name of the Java runtime: "java.runtime.name".

See Also:

• Constant Field Values

PROPERTY_JAVA_VENDOR

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_JAVA_VENDOR

The vested system property for the Java vendor: "java.vendor".

See Also:

• Constant Field Values

PROPERTY_JAVA_VENDOR_URL

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_JAVA_VENDOR_URL

The vested system property for the homepage URL of the Java vendor: "java.vendor.url".

See Also:

• Constant Field Values

PROPERTY_JAVA_VERSION

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_JAVA_VERSION

The vested system property for the Java version: "java.version".

See Also:

• Constant Field Values

PROPERTY_JVM_NAME

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_JVM_NAME

The vested system property for the name of the current JVM: "java.vm.name".

See Also:

• Constant Field Values

PROPERTY_JVM_VENDOR

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_JVM_VENDOR

The vested system property for the name of the vendor for the current JVM: "java.vm.vendor".

See Also:

• Constant Field Values

PROPERTY_JVM_VERSION

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_JVM_VERSION

The vested system property for the version of the current JVM: "java.vm.version".

See Also:

• Constant Field Values

PROPERTY_LINE_SEPARATOR

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_LINE_SEPARATOR

The vested system property for the line separator: "line.separator".

See Also:

• Constant Field Values

PROPERTY_LOGGING_CONFIG_CLASS

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_LOGGING_CONFIG_CLASS

The optional system property for the name of the class that provides the configuration the JDK logger: "java.util.logging.config.class".

See Also:

• Constant Field Values

PROPERTY_LOGGING_CONFIG_FILE

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_LOGGING_CONFIG_FILE

The optional system property for the name of the configuration file for the JDK logger: "java.util.logging.config.file".

See Also:

• Constant Field Values

PROPERTY_MAIL_SESSION_DEBUG

@API(status=STABLE,
     since="0.1.0")
public static final String PROPERTY_MAIL_SESSION_DEBUG

The optional system property for enabling java mail session debug: "javax.mail.Session.debug".

This flag will not be recognised automatically. Refer to the documentation of javax.mail.Session.

See Also:

• Constant Field Values

PROPERTY_MODULEPATH

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_MODULEPATH

The (vested [?]) system property for the current module path: "jdk.module.path".

See Also:

• Constant Field Values

PROPERTY_NET_PROTOCOL_PKGS

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_NET_PROTOCOL_PKGS

The system property for the name of the packages with URL protocol handlers: "java.protocol.handler.pkgs".

See Also:

• Constant Field Values

PROPERTY_OSNAME

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_OSNAME

The vested system property for the name of the current operating system: "os.name".

See Also:

• Constant Field Values

PROPERTY_OSVERSION

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_OSVERSION

The vested system property for the version of the current operating system: "os.version".

See Also:

• Constant Field Values

PROPERTY_PREFS_ROOT_SYSTEM

@API(status=STABLE,
     since="0.0.6")
public static final String PROPERTY_PREFS_ROOT_SYSTEM

The system property for the location of the system preferences files on a UNIX/Linux system: "java.util.prefs.systemRoot".

If not set, the location is /etc/, resulting to /etc/.java/.systemPrefs.

If the default location is used, the respective folder has to be created by a user with root permissions; the files in there should have the rights 544, while the folder and its sub-folders should have 755.

See Also:

• Constant Field Values

PROPERTY_PREFS_ROOT_USER

@API(status=STABLE,
     since="0.0.6")
public static final String PROPERTY_PREFS_ROOT_USER

The system property for the location of the user preferences files on a UNIX/Linux system: "java.util.prefs.userRoot".

If not set, the location is ~/, resulting to ~/.java/.userPrefs/.

See Also:

• Constant Field Values

PROPERTY_PREFS_SYNC

@API(status=STABLE,
     since="0.0.6")
public static final String PROPERTY_PREFS_SYNC

The system property for the synchronisation interval of the preferences on a UNIX/Linux system, in seconds: "java.util.prefs.syncInterval".

If not set, the interval is 30 seconds. The minimum value is one second.

See Also:

• Constant Field Values

PROPERTY_RESOURCEBUNDLE_ENCODING

@API(status=STABLE,
     since="0.1.0")
public static final String PROPERTY_RESOURCEBUNDLE_ENCODING

The system property that is used to force the encoding for a PropertyResourceBundle: "java.util.PropertyResourceBundle.encoding". Valid values are "UTF-8" and "ISO-8859-1".

See Also:

• Constant Field Values

PROPERTY_SAX_PARSER_FACTORY

@API(status=STABLE,
     since="0.0.7")
public static final String PROPERTY_SAX_PARSER_FACTORY

The system property for the class name of the SAX XML parser factory: "javax.xml.parsers.SAXParserFactory".

See Also:

• Constant Field Values

PROPERTY_SSL_KEYSTORE

@API(status=STABLE,
     since="0.0.7")
public static final String PROPERTY_SSL_KEYSTORE

The system property for the name of the file with the SSL key store: "javax.net.ssl.keyStore".

See Also:

• Constant Field Values

PROPERTY_SSL_KEYSTORE_PASSWORD

@API(status=STABLE,
     since="0.0.7")
public static final String PROPERTY_SSL_KEYSTORE_PASSWORD

The system property for the password for the SSL key store: "javax.net.ssl.keyStorePassword".

See Also:

• PROPERTY_SSL_KEYSTORE
• Constant Field Values

PROPERTY_TEMPFOLDER

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_TEMPFOLDER

The vested system property for the name of the temp folder that is used by the current user: "java.io.tmpdir".

See Also:

• Constant Field Values

PROPERTY_USER_COUNTRY

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_USER_COUNTRY

The system property for the country code setting for the current user: "user.country".

See Also:

• Constant Field Values

PROPERTY_USER_DIR

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_USER_DIR

The vested system property for the name of the current working directory of the current user: "user.dir".

See Also:

• Constant Field Values

PROPERTY_USER_HOME

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_USER_HOME

The vested system property for the name of the home directory of the current user: "user.home".

See Also:

• Constant Field Values

PROPERTY_USER_LANG

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_USER_LANG

The system property for the language code setting the current user: "user.language".

See Also:

• Constant Field Values

PROPERTY_USER_NAME

@API(status=STABLE,
     since="0.0.5")
public static final String PROPERTY_USER_NAME

The vested system property for the name of the current user: "user.name".

See Also:

• Constant Field Values

PROPERTY_USER_TIMEZONE

@API(status=STABLE,
     since="0.0.6")
public static final String PROPERTY_USER_TIMEZONE

The system property for the time zone setting the current user: "user.timezone".

See Also:

• Constant Field Values

ASCII

@API(status=STABLE,
     since="0.0.5")
public static final Charset ASCII

The reference to the ASCII character set.

See Also:

• StandardCharsets

ISO8859_1

@API(status=STABLE,
     since="0.0.5")
public static final Charset ISO8859_1

The reference to the ISO-8859-1 character set.

See Also:

• StandardCharsets

US_ASCII

@API(status=STABLE,
     since="0.0.5")
public static final Charset US_ASCII

The reference to the US-ASCII character set; this is the same as the ASCII character set.

See Also:

• StandardCharsets

UTF8

@API(status=STABLE,
     since="0.0.5")
public static final Charset UTF8

The reference to the UTF-8 character set.

See Also:

• StandardCharsets

UTC

@Deprecated(since="0.4.4",
            forRemoval=true)
@API(status=DEPRECATED,
     since="0.0.5")
public static final TimeZone UTC

Deprecated, for removal: This API element is subject to removal in a future version.

As the java.util.Date API is now obsolete, also the related classes, like java.util.TimeZone should be used no longer.

The basic time zone (the time zone for the 'Universal Time Code').

ZONE_UTC

@Deprecated(since="0.4.4",
            forRemoval=false)
@API(status=DEPRECATED,
     since="0.0.6")
public static final ZoneId ZONE_UTC

Deprecated.

Use ZoneOffset.UTC instead.

The basic time zone (the time zone for the 'Universal Time Code').

CDATA_LEADIN

@API(status=STABLE,
     since="0.0.5")
public static final String CDATA_LEADIN

The lead-in for a CDATA wrapped String: "<![CDATA["

See Also:

• Constant Field Values

CDATA_LEADOUT

@API(status=STABLE,
     since="0.0.5")
public static final String CDATA_LEADOUT

The lead-out for a CDATA wrapped String: "]]>"

See Also:

• Constant Field Values

THREADGROUP_MAIN

@API(status=STABLE,
     since="0.0.6")
public static final String THREADGROUP_MAIN

The name of the main thread group: "main".

This is the group of the main thread.

See Also:

• Constant Field Values

THREADGROUP_SYSTEM

@API(status=STABLE,
     since="0.0.6")
public static final String THREADGROUP_SYSTEM

The name of the system thread group: "system".

This is the group of several system threads and the parent thread group for the main thread group.

See Also:

• Constant Field Values

XMLATTRIBUTE_Category

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Category

The attribute name for an XML attribute holding a category of something: "category".

See Also:

• XMLATTRIBUTE_Type
• Constant Field Values

XMLATTRIBUTE_Class

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Class

The attribute name for an XML attribute holding a class name: "class".

See Also:

• XMLATTRIBUTE_Type
• Constant Field Values

XMLATTRIBUTE_Date

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Date

The attribute name for an XML attribute holding a date, usually without the time information: "date".

See Also:

• XMLATTRIBUTE_Time
• XMLATTRIBUTE_Timestamp
• Constant Field Values

XMLATTRIBUTE_File

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_File

The attribute name for an XML attribute holding a file name: "file".

See Also:

• Constant Field Values

XMLATTRIBUTE_Id

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Id

The attribute name for the XML id attribute: "xml:id".

See Also:

• Constant Field Values

XMLATTRIBUTE_IdRef

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_IdRef

The attribute name for the XML idref attribute: "idref".

See Also:

• Constant Field Values

XMLATTRIBUTE_Language

@API(status=STABLE,
     since="0.1.0")
public static final String XMLATTRIBUTE_Language

The attribute name for the XML language attribute: "xml:lang".

This reserved attribute takes an ISO639 language identifier as value. It indicates the language of the body of the element.

See Also:

• Constant Field Values

XMLATTRIBUTE_Name

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Name

The attribute name for the XML name attribute: "name".

Only names that follow exact rules for their character set can be stored in XML attributes, but free names have to be stored as XML elements.

See Also:

• XMLELEMENT_Name
• Constant Field Values

XMLATTRIBUTE_NodeId

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_NodeId

The name for the node id XML attribute: "node".

See Also:

• Constant Field Values

XMLATTRIBUTE_PID

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_PID

The name for the PID XML attribute: "pid".

See Also:

• Constant Field Values

XMLATTRIBUTE_Reference

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Reference

The name for the reference XML attribute: "reference".

See Also:

• Constant Field Values

XMLATTRIBUTE_SequenceNumber

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_SequenceNumber

The name for the sequence number XML attribute: "sequenceNumber".

See Also:

• Constant Field Values

XMLATTRIBUTE_Status

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Status

The name for the status XML attribute: "status".

See Also:

• Constant Field Values

XMLATTRIBUTE_Time

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Time

The attribute name for an XML attribute holding a time, usually without the date information: "time".

See Also:

• XMLATTRIBUTE_Date
• XMLATTRIBUTE_Timestamp
• Constant Field Values

XMLATTRIBUTE_Timestamp

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Timestamp

The name for an XML attribute holding a date/time: "timestamp".

See Also:

• XMLATTRIBUTE_Date
• XMLATTRIBUTE_Time
• Constant Field Values

XMLATTRIBUTE_Type

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Type

The name for an XML attribute holding a type, in the sense of a category or model, and usually not in the sense this term is used in the context of programming languages: "type".

See Also:

• XMLATTRIBUTE_Category
• XMLATTRIBUTE_Class
• Constant Field Values

XMLATTRIBUTE_UserId

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_UserId

The name for the user id XML attribute: "userId".

See Also:

• Constant Field Values

XMLATTRIBUTE_Version

@API(status=STABLE,
     since="0.0.5")
public static final String XMLATTRIBUTE_Version

The name for the version XML attribute: "version".

See Also:

• Constant Field Values

XMLATTRIBUTE_Whitespace

@API(status=STABLE,
     since="0.1.0")
public static final String XMLATTRIBUTE_Whitespace

The attribute name for the XML space attribute: "xml:space".

This reserved attribute indicates whether any whitespace inside the element is significant and should not be altered by the XML processor. The attribute can take one of two enumerated values:

preserve

The XML application preserves all whitespace (newlines, spaces, and tabs) present within the element.

default

The XML processor uses its default processing rules when deciding to preserve or discard the whitespace inside the element.

See Also:

• Constant Field Values

XMLELEMENT_Comment

@API(status=STABLE,
     since="0.0.5")
public static final String XMLELEMENT_Comment

The element name for an XML element representing a comment: "comment".

This is not an XML comment (they will be written as <!-- … --> in the XML stream) but data that is semantically a comment (like a description, see below).

See Also:

• Constant Field Values

XMLELEMENT_Date

@API(status=STABLE,
     since="0.0.5")
public static final String XMLELEMENT_Date

The element name for an XML element holding a date, usually without the time information: "date".

See Also:

• XMLELEMENT_Time
• XMLELEMENT_Timestamp
• Constant Field Values

XMLELEMENT_Description

@API(status=STABLE,
     since="0.0.5")
public static final String XMLELEMENT_Description

The element name for an XML element representing a description of some kind: "description".

See Also:

• Constant Field Values

XMLELEMENT_Message

@API(status=STABLE,
     since="0.0.5")
public static final String XMLELEMENT_Message

The element name for an XML element containing a message: "message".

See Also:

• Constant Field Values

XMLELEMENT_Name

@API(status=STABLE,
     since="0.0.5")
public static final String XMLELEMENT_Name

The element name for an XML element representing a name of some kind: "name".

Only names that follow exact rules for their character set can be stored in XML attributes, but free names have to be stored as XML elements.

See Also:

• XMLATTRIBUTE_Name
• Constant Field Values

XMLELEMENT_Text

@API(status=STABLE,
     since="0.0.5")
public static final String XMLELEMENT_Text

The element name for an XML element holding text: "text".

See Also:

• Constant Field Values

XMLELEMENT_Time

@API(status=STABLE,
     since="0.0.5")
public static final String XMLELEMENT_Time

The element name for an XML element holding a time, usually without the date information: "time".

See Also:

• XMLELEMENT_Date
• XMLELEMENT_Timestamp
• Constant Field Values

XMLELEMENT_Timestamp

@API(status=STABLE,
     since="0.0.5")
public static final String XMLELEMENT_Timestamp

The name for an XML element holding a date/time: "timestamp".

See Also:

• XMLELEMENT_Date
• XMLELEMENT_Time
• Constant Field Values

CR

@API(status=STABLE,
     since="0.0.5")
public static final String CR

The line terminator as defined by the underlying operating system.

DECIMAL_SEPARATOR

@API(status=STABLE,
     since="0.0.5")
public static final char DECIMAL_SEPARATOR

The decimal separator for the current locale.

DEFAULT_APPLICATION_ID

@API(status=STABLE,
     since="0.0.5")
public static final String DEFAULT_APPLICATION_ID

The default application id if nothing else could be used: "Default Program Main".

See Also:

• Constant Field Values

EMPTY_STRING

@API(status=STABLE,
     since="0.0.5")
public static final String EMPTY_STRING

The empty string.

EMPTY_CHARSEQUENCE

@API(status=STABLE,
     since="0.0.5")
public static final CharSequence EMPTY_CHARSEQUENCE

An empty char sequence.

EOF

@API(status=STABLE,
     since="0.0.5")
public static final int EOF

The End-Of-File marker for streams: -1.

See Also:

• Constant Field Values

NOT_FOUND

@API(status=STABLE,
     since="0.1.0")
public static final int NOT_FOUND

The index value indicating that nothing was found: -1. See for example String.indexOf(int).

See Also:

• Constant Field Values

NUL

@API(status=STABLE,
     since="0.1.0")
public static final String NUL

A String containing only NUL (the NULL_CHAR).

NULL_CHAR

@API(status=STABLE,
     since="0.0.5")
public static final char NULL_CHAR

The null character.

NULL_STRING

@API(status=STABLE,
     since="0.0.5")
public static final String NULL_STRING

A String containing the sequence "null".

THOUSANDS_SEPARATOR

@API(status=STABLE,
     since="0.0.5")
public static final char THOUSANDS_SEPARATOR

The grouping separator for the current locale, used with large numbers to separate thousands.

UNKNOWN_STRING

@API(status=STABLE,
     since="0.0.5")
public static final String UNKNOWN_STRING

A String containing the sequence "<UNKNOWN>".

See Also:

• Constant Field Values

IS_NULL

@API(status=STABLE,
     since="0.0.5")
public static final Predicate<? extends Object> IS_NULL

Returns true if the provided reference is null otherwise returns false.

See Also:

• Objects.isNull(Object)
• Predicate

NON_NULL

@API(status=STABLE,
     since="0.0.5")
public static final Predicate<? extends Object> NON_NULL

Returns true if the provided reference is non-null otherwise returns false.

See Also:

• Objects.nonNull(Object)
• Predicate

Constructor Details

CommonConstants

private CommonConstants()

No instance of this class is allowed.