Module org.apache.jena.base
Package org.apache.jena.atlas.lib

Class Lib

java.lang.Object
org.apache.jena.atlas.lib.Lib
public class Lib extends Object

  • Method Details

    • concatPaths

      public static String concatPaths(String directory, String path)
      Concatenate two "/" delimited path names.
      • If path (second argument) starts with "/", it is assumed to be absolute and path is returned.
      • If path (second argument) is "", return the directory.
      • Otherwise the arguments are concatenated ensuring there is a "/" between them.

    • concurrentHashSet

      public static final <X> Set<X> concurrentHashSet()
      "ConcurrentHashSet"

    • sync

      public static final void sync(Object object)

    • equals

      public static final <T> boolean equals(T obj1, T obj2)
      Return true if obj1 and obj are both null or are .equals, else return false Prefer Objects.equals(Object, Object)

    • equalsIgnoreCase

      public static final boolean equalsIgnoreCase(String str1, String str2)
      Return true if obj1 and obj are both null or are .equals, else return false

    • notEqual

      public static final <T> boolean notEqual(T obj1, T obj2)
      Return true if obj1 and obj are not equal

    • className

      public static final String className(Object obj)
      Safely return the class short name for an object -- obj.getClass().getSimpleName()

    • classShortName

      public static final String classShortName(Class<?> cls)
      Safely return the class short name for a class

    • unsupportedMethod

      public static UnsupportedOperationException unsupportedMethod(Object object, String method)
      Create UnsupportedOperationException with formatted message.

    • runtimeException

      public static RuntimeException runtimeException(Exception ex)
      Return a RuntimeException. If the argument is already RuntimeException, return the argument. Otherwise, wrap in RuntimeException, with the same message, and return the RuntimeException

    • equalsListAsSet

      public static <T> boolean equalsListAsSet(List<T> list1, List<T> list2)
      Do two lists have the same elements without considering the order of the lists nor duplicates?

    • hashCodeObject

      public static final int hashCodeObject(Object obj)
      HashCode - allow nulls

    • hashCodeObject

      public static final int hashCodeObject(Object obj, int nullHashCode)
      HashCode - allow nulls

    • isEmpty

      public static boolean isEmpty(CharSequence cs)

    • lowercase

      public static String lowercase(String string)
      Non-locale lowercase Locale.ROOT

    • uppercase

      public static String uppercase(String string)
      Non-locale uppercase Locale.ROOT

    • sleep

      public static final void sleep(int milliSeconds)

    • getenv

      public static String getenv(String name)
      Get an environment variable value; if not found try in the system properties.

    • getenv

      public static String getenv(String sysPropName, String envName)
      Get system properties (argument sysPropName) or if not found, read an environment variable value (argument envName).

    • setenv

      public static void setenv(String sysPropName, String value)
      Set the environment name in the java system properties (NB not the immutable process environment variables). getenv(String) looks in the system properties as well as the process environment variables.

    • isPropertyOrEnvVarSetToTrue

      public static boolean isPropertyOrEnvVarSetToTrue(String name)
      Test whether a property (environment variable or system property) is true.

    • isPropertyOrEnvVarSetToTrue

      public static boolean isPropertyOrEnvVarSetToTrue(String sysPropName, String envName)
      Test whether a property (argument sysPropName) or an environment variable (argument envName) is true.

    • readThreadLocal

      public static <X> X readThreadLocal(ThreadLocal<X> threadLocal)
      Read thread local, assuming that "null" means it does not exist for this thread. If null is read, the thread local is removed.

    • crc32

      public static long crc32(byte[] bytes)
      See Also:

    • adler32

      public static long adler32(byte[] bytes)
      Faster than CRC32, nearly as good.
      See Also:

    • murmurHashHex

      public static String murmurHashHex(String string)
      Calculate the Murmur3 hash of a string, and return it as a hex-encoded string.

    • powerSet

      public static <X> Set<Set<X>> powerSet(Set<X> elts)
      PowerSet