src/share/classes/java/lang/SafeVarargs.java

*** 1,7 ****
  /*
!  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 30,71 ****
  /**
   * A programmer assertion that the body of the annotated method or
   * constructor does not perform potentially unsafe operations on its
   * varargs parameter.  Applying this annotation to a method or
   * constructor suppresses unchecked warnings about a
!  * <i>non-reifiable</i> variable-arity (vararg) type and suppresses
   * unchecked warnings about parameterized array creation at call
   * sites.
   *
   * <p> In addition to the usage restrictions imposed by its {@link
   * Target @Target} meta-annotation, compilers are required to implement
   * additional usage restrictions on this annotation type; it is a
   * compile-time error if a method or constructor declaration is
   * annotated with a {@code @SafeVarargs} annotation, and either:
- 
   * <ul>
!  * <li>  the declaration is a fixed-arity method or constructor
   *
!  * <li> the declaration is a variable-arity method that is neither
   * {@code static} nor {@code final}.
   *
   * </ul>
   *
   * <p> Compilers are encouraged to issue warnings when this annotation
   * type is applied to a method or constructor declaration where:
   *
   * <ul>
   *
!  * <li> The variable-arity parameter has a reifiable element type,
   * which includes primitive types, {@code Object}, and {@code String}.
   * (The unchecked warnings this annotation type suppresses already do
   * not occur for a reifiable element type.)
   *
   * <li> The body of the method or constructor declaration performs
   * potentially unsafe operations, such as an assignment to an element
!  * of the variable-arity parameter's array that generates an unchecked
!  * warning.
   *
   * <p>Future versions of the platform may mandate compiler errors for
   * such unsafe operations.
   *
   * </ul>
--- 30,83 ----
  /**
   * A programmer assertion that the body of the annotated method or
   * constructor does not perform potentially unsafe operations on its
   * varargs parameter.  Applying this annotation to a method or
   * constructor suppresses unchecked warnings about a
!  * <i>non-reifiable</i> variable arity (vararg) type and suppresses
   * unchecked warnings about parameterized array creation at call
   * sites.
   *
   * <p> In addition to the usage restrictions imposed by its {@link
   * Target @Target} meta-annotation, compilers are required to implement
   * additional usage restrictions on this annotation type; it is a
   * compile-time error if a method or constructor declaration is
   * annotated with a {@code @SafeVarargs} annotation, and either:
   * <ul>
!  * <li>  the declaration is a fixed arity method or constructor
   *
!  * <li> the declaration is a variable arity method that is neither
   * {@code static} nor {@code final}.
   *
   * </ul>
   *
   * <p> Compilers are encouraged to issue warnings when this annotation
   * type is applied to a method or constructor declaration where:
   *
   * <ul>
   *
!  * <li> The variable arity parameter has a reifiable element type,
   * which includes primitive types, {@code Object}, and {@code String}.
   * (The unchecked warnings this annotation type suppresses already do
   * not occur for a reifiable element type.)
   *
   * <li> The body of the method or constructor declaration performs
   * potentially unsafe operations, such as an assignment to an element
!  * of the variable arity parameter's array that generates an unchecked
!  * warning.  Some unsafe operations do not trigger an unchecked
!  * warning.  For example, the aliasing in 
!  *
!  * <blockquote><pre>
!  * &#64;SafeVarargs // Not actually safe!
!  * static void m(List&lt;String&gt;... stringLists) {
!  *   Object[] array = stringLists;
!  *   List&lt;Integer&gt; tmpList = Arrays.asList(42);
!  *   array[0] = tmpList; // Semantically invalid, but compiles without warnings
!  *   String s = stringLists[0].get(0); // Oh no, ClassCastException at runtime!
!  * }
!  * </pre></blockquote>
!  *
!  * leads to a {@code ClassCastException} at runtime.
   *
   * <p>Future versions of the platform may mandate compiler errors for
   * such unsafe operations.
   *
   * </ul>