Mercurial > hg > release > icedtea7-forest-2.3 > jdk
changeset 3384:78885e69c42c
7006129: Project Coin: Annotation type to reduce varargs warnings
Reviewed-by: jjg, mcimadamore
author | darcy |
---|---|
date | Mon, 13 Dec 2010 14:34:37 -0800 |
parents | 1740ad242f56 |
children | 9cc67a600965 6d3fb387da8e |
files | make/java/java/FILES_java.gmk src/share/classes/java/lang/SafeVarargs.java |
diffstat | 2 files changed, 81 insertions(+), 1 deletions(-) [+] |
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--- a/make/java/java/FILES_java.gmk Mon Dec 13 14:12:56 2010 -0800 +++ b/make/java/java/FILES_java.gmk Mon Dec 13 14:34:37 2010 -0800 @@ -1,5 +1,5 @@ # -# Copyright (c) 1996, 2008, Oracle and/or its affiliates. All rights reserved. +# Copyright (c) 1996, 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 @@ -137,6 +137,7 @@ java/lang/Comparable.java \ java/lang/Readable.java \ java/lang/Override.java \ + java/lang/SafeVarargs.java \ java/lang/SuppressWarnings.java \ java/lang/ref/Reference.java \ java/lang/ref/SoftReference.java \
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/classes/java/lang/SafeVarargs.java Mon Dec 13 14:34:37 2010 -0800 @@ -0,0 +1,79 @@ +/* + * 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 + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +package java.lang; + +import java.lang.annotation.*; + +/** + * 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> + * + * @jls3 4.7 Reifiable Types + * @jls3 8.4.1 Formal Parameters + */ +@Documented +@Retention(RetentionPolicy.RUNTIME) +@Target({ElementType.CONSTRUCTOR, ElementType.METHOD}) +public @interface SafeVarargs {}