Class TypeUtil

java.lang.Object
org.eclipse.jetty.util.TypeUtil

public class TypeUtil extends Object
TYPE Utilities. Provides various static utility methods for manipulating types and their string representations.
Since:
Jetty 4.1
  • Field Details

  • Constructor Details

    • TypeUtil

      public TypeUtil()
  • Method Details

    • asList

      public static <T> List<T> asList(T[] a)
      Array to List.

      Works like Arrays.asList(Object...), but handles null arrays.

      Type Parameters:
      T - the array and list entry type
      Parameters:
      a - the array to convert to a list
      Returns:
      a list backed by the array.
    • fromName

      public static Class<?> fromName(String name)
      Class from a canonical name for a type.
      Parameters:
      name - A class or type name.
      Returns:
      A class , which may be a primitive TYPE field..
    • toName

      public static String toName(Class<?> type)
      Canonical name for a type.
      Parameters:
      type - A class , which may be a primitive TYPE field.
      Returns:
      Canonical name.
    • toClassReference

      public static String toClassReference(Class<?> clazz)
      Return the Classpath / Classloader reference for the provided class file.

      Convenience method for the code

       String ref = myObject.getClass().getName().replace('.','/') + ".class";
       
      Parameters:
      clazz - the class to reference
      Returns:
      the classpath reference syntax for the class file
    • toClassReference

      public static String toClassReference(String className)
      Return the Classpath / Classloader reference for the provided class file.

      Convenience method for the code

       String ref = myClassName.replace('.','/') + ".class";
       
      Parameters:
      className - the class to reference
      Returns:
      the classpath reference syntax for the class file
    • valueOf

      public static Object valueOf(Class<?> type, String value)
      Convert String value to instance.
      Parameters:
      type - The class of the instance, which may be a primitive TYPE field.
      value - The value as a string.
      Returns:
      The value as an Object.
    • valueOf

      public static Object valueOf(String type, String value)
      Convert String value to instance.
      Parameters:
      type - classname or type (eg int)
      value - The value as a string.
      Returns:
      The value as an Object.
    • parseInt

      public static int parseInt(String s, int offset, int length, int base) throws NumberFormatException
      Parse an int from a substring. Negative numbers are not handled.
      Parameters:
      s - String
      offset - Offset within string
      length - Length of integer or -1 for remainder of string
      base - base of the integer
      Returns:
      the parsed integer
      Throws:
      NumberFormatException - if the string cannot be parsed
    • parseInt

      public static int parseInt(byte[] b, int offset, int length, int base) throws NumberFormatException
      Parse an int from a byte array of ascii characters. Negative numbers are not handled.
      Parameters:
      b - byte array
      offset - Offset within string
      length - Length of integer or -1 for remainder of string
      base - base of the integer
      Returns:
      the parsed integer
      Throws:
      NumberFormatException - if the array cannot be parsed into an integer
    • parseBytes

      public static byte[] parseBytes(String s, int base)
    • toString

      public static String toString(byte[] bytes, int base)
    • convertHexDigit

      public static byte convertHexDigit(byte c)
      Parameters:
      c - An ASCII encoded character 0-9 a-f A-F
      Returns:
      The byte value of the character 0-16.
    • convertHexDigit

      public static int convertHexDigit(char c)
      Parameters:
      c - An ASCII encoded character 0-9 a-f A-F
      Returns:
      The byte value of the character 0-16.
    • convertHexDigit

      public static int convertHexDigit(int c)
      Parameters:
      c - An ASCII encoded character 0-9 a-f A-F
      Returns:
      The byte value of the character 0-16.
    • toHex

      public static void toHex(byte b, Appendable buf)
    • toHex

      public static void toHex(int value, Appendable buf) throws IOException
      Throws:
      IOException
    • toHex

      public static void toHex(long value, Appendable buf) throws IOException
      Throws:
      IOException
    • toHexString

      public static String toHexString(byte b)
    • toHexString

      public static String toHexString(byte[] b)
    • toHexString

      public static String toHexString(byte[] b, int offset, int length)
    • fromHexString

      public static byte[] fromHexString(String s)
    • dump

      public static void dump(Class<?> c)
    • dump

      public static void dump(ClassLoader cl)
    • call

      @Deprecated public static Object call(Class<?> oClass, String methodName, Object obj, Object[] arg) throws InvocationTargetException, NoSuchMethodException
      Deprecated.
      Throws:
      InvocationTargetException
      NoSuchMethodException
    • construct

      @Deprecated public static Object construct(Class<?> klass, Object[] arguments) throws InvocationTargetException, NoSuchMethodException
      Deprecated.
      Throws:
      InvocationTargetException
      NoSuchMethodException
    • construct

      @Deprecated public static Object construct(Class<?> klass, Object[] arguments, Map<String,Object> namedArgMap) throws InvocationTargetException, NoSuchMethodException
      Deprecated.
      Throws:
      InvocationTargetException
      NoSuchMethodException
    • isTrue

      public static boolean isTrue(Object o)
      Parameters:
      o - Object to test for true
      Returns:
      True if passed object is not null and is either a Boolean with value true or evaluates to a string that evaluates to true.
    • isFalse

      public static boolean isFalse(Object o)
      Parameters:
      o - Object to test for false
      Returns:
      True if passed object is not null and is either a Boolean with value false or evaluates to a string that evaluates to false.
    • getLocationOfClass

      public static URI getLocationOfClass(Class<?> clazz)
      Attempt to find the Location of a loaded Class.

      This can be null for primitives, void, and in-memory classes.

      Parameters:
      clazz - the loaded class to find a location for.
      Returns:
      the location as a URI (this is a URI pointing to a holder of the class: a directory, a jar file, a jrt:// resource, etc), or null of no location available.
    • getClassLoaderLocation

      public static URI getClassLoaderLocation(Class<?> clazz)
    • getSystemClassLoaderLocation

      public static URI getSystemClassLoaderLocation(Class<?> clazz)
    • getClassLoaderLocation

      public static URI getClassLoaderLocation(Class<?> clazz, ClassLoader loader)
    • getCodeSourceLocation

      public static URI getCodeSourceLocation(Class<?> clazz)
    • getModuleLocation

      public static URI getModuleLocation(Class<?> clazz)