Method isJavaBoxTypesAssignable

src/bsh/Types.java:331–362

Determine if the type is assignable via Java boxing/unboxing rules.

(
		Class lhsType, Class rhsType )

		Determine if the type is assignable via Java boxing/unboxing rules.
	*/
	static boolean isJavaBoxTypesAssignable(
		Class lhsType, Class rhsType )
	{
		// Assignment to loose type... defer to bsh extensions
		if ( lhsType == null )
			return false;

		// prim can be boxed and assigned to Object
		if ( lhsType == Object.class )
			return true;

        // null rhs type corresponds to type of Primitive.NULL
        // assignable to any object type but not array
        if (rhsType == null)
            return !lhsType.isPrimitive() && !lhsType.isArray();

		// prim numeric type can be boxed and assigned to number
		if ( lhsType == Number.class
			&& rhsType != Character.TYPE
			&& rhsType != Boolean.TYPE
		)
			return true;

		// General case prim type to wrapper or vice versa.
		// I don't know if this is faster than a flat list of 'if's like above.
		// wrapperMap maps both prim to wrapper and wrapper to prim types,
		// so this test is symmetric
		if ( Primitive.wrapperMap.get( lhsType ) == rhsType )
			return true;

        return isJavaBaseAssignable(lhsType, rhsType);
	}

	/**
	 Test if a type can be converted to another type via BeanShell