Module org.eclipse.xtext.xbase.lib
Package org.eclipse.xtext.xbase.lib

Class ObjectExtensions

java.lang.Object
org.eclipse.xtext.xbase.lib.ObjectExtensions
@GwtCompatible public class ObjectExtensions extends Object
This is an extension library for all objects.

  • Constructor Details

    • ObjectExtensions

      public ObjectExtensions()

  • Method Details

    • operator_notEquals

      @Pure public static boolean operator_notEquals(Object a, Object b)
      The equals not operator. This is the equivalent to a negated, null-safe Object.equals(Object) method.
      Parameters:
      a - an object.
      b - another object.
      Returns:
      true if a and b are not equal.

    • operator_equals

      @Pure public static boolean operator_equals(Object a, Object b)
      The equals operator. This is the equivalent to a null-safe invocation of Object.equals(Object).
      Parameters:
      a - an object.
      b - another object.
      Returns:
      true if a and b are equal.

    • identityEquals

      @Pure public static boolean identityEquals(Object a, Object b)
      Returns true if a and b are identical (the same instance) or both null. This is the equivalent to Java's == operator.
      Parameters:
      a - an object.
      b - another object.
      Returns:
      Java's a == b

    • operator_tripleEquals

      @Pure public static boolean operator_tripleEquals(Object a, Object b)
      The identity equals operator. This is the equivalent to Java's == operator.
      Parameters:
      a - an object.
      b - another object.
      Returns:
      Java's a == b
      Since:
      2.4

    • operator_tripleNotEquals

      @Pure public static boolean operator_tripleNotEquals(Object a, Object b)
      The identity not equals operator. This is the equivalent to Java's != operator.
      Parameters:
      a - an object.
      b - another object.
      Returns:
      Java's a != b
      Since:
      2.4

    • operator_mappedTo

      @Pure public static <A, B> Pair<A,B> operator_mappedTo(A a, B b)
      The mappedTo operator yields a Pair with a as the key and b as its value.
      Parameters:
      a - an object.
      b - another object.
      Returns:
      a Pair. Never null.

    • operator_doubleArrow

      public static <T> T operator_doubleArrow(T object, Procedures.Procedure1<? super T> block)
      The doubleArrow operator is used as a 'with'- or 'let'-operation. It allows to bind an object to a local scope in order to do something on it. Example: new Person => [ firstName = 'Han' lastName = 'Solo' ]
      Parameters:
      object - an object. Can be null.
      block - the block to execute with the given object. Must not be null.
      Returns:
      the reference to object.
      Since:
      2.3

    • operator_plus

      @Pure public static String operator_plus(Object a, String b)
      The binary + operator that concatenates two strings.
      Parameters:
      a - an Object.
      b - a String.
      Returns:
      a + b
      Since:
      2.3

    • operator_elvis

      @Pure public static <T> T operator_elvis(T first, T second)
      The elvis operator ?: is a short hand notation for providing default value in case an expression evaluates to null. Not that the Xtend compiler will inline calls to this not call this method with a short-circuit semantic. That is the second argument is only evaluated if the first one evaluates to null. Example: person.name?:'Hans'
      Parameters:
      first - an Object. Might be null.
      second - an Object. Might be null.
      Returns:
      a reference to first if first != null , second otherwise,
      Since:
      2.3