cs132.util
Class LangUtil

java.lang.Object
  cs132.util.LangUtil

public class LangUtil
extends Object

Constructor Summary

LangUtil()

Method Summary

static <T> T[]	A(T... elements) Returns the given list of values as an array.
static void	assertBadType(Object o)
static AssertionError	assertMessage(String message, Throwable cause)
static AssertionError	badType(Enum<?> e)
static AssertionError	badType(Object o) Returns an AssertionError with a helpful message about what the type of the given object is.
static <T,R> R	cast(T value)
static boolean	eq(Object a, Object b) Similar to "a.equals(b)" except it works when either value is null.
static <T extends Throwable> T	initCause(T throwable, Throwable cause)
static RuntimeException	todo() Returns: new RuntimeException("todo").
static RuntimeException	todo(String s) Returns: new RuntimeException("todo: " + s).

Methods inherited from class java.lang.Object

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

Constructor Detail

LangUtil

public LangUtil()

Method Detail

initCause

public static <T extends Throwable> T initCause(T throwable,
                                                Throwable cause)

assertMessage

public static AssertionError assertMessage(String message,
                                           Throwable cause)

badType

public static AssertionError badType(Object o)

Returns an AssertionError with a helpful message about what the type of the given object is. Example use:

 if (e instanceof BinaryOp) {
   BinaryOp b = (BinaryOp) e;
   ...
 } else if (e instanceof Literal) {
   Literal l = (Literal) e;
   ...
 } else {
   throw badType(e);
 }
 

badType

public static AssertionError badType(Enum<?> e)

assertBadType

public static void assertBadType(Object o)

cast

public static <T,R> R cast(T value)

A

public static <T> T[] A(T... elements)

Returns the given list of values as an array.

Example: String[] args = A("java", "-jar", "HelloWorld.jar")

todo

public static RuntimeException todo()

Returns: new RuntimeException("todo").

Example: throw todo().

todo

public static RuntimeException todo(String s)

Returns: new RuntimeException("todo: " + s).

Example: throw todo("error handling").

eq

public static boolean eq(Object a,
                         Object b)

Similar to "a.equals(b)" except it works when either value is null.