1 /*
   2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.api.replacements;
  24 
  25 import java.lang.annotation.ElementType;
  26 import java.lang.annotation.Retention;
  27 import java.lang.annotation.RetentionPolicy;
  28 import java.lang.annotation.Target;
  29 
  30 /**
  31  * Denotes a class that substitutes methods of another specified class. The substitute methods are
  32  * exactly those annotated by {@link MethodSubstitution}.
  33  */
  34 @Retention(RetentionPolicy.RUNTIME)
  35 @Target(ElementType.TYPE)
  36 public @interface ClassSubstitution {
  37 
  38     /**
  39      * Specifies the original class.
  40      * <p>
  41      * If the default value is specified for this element, then a non-default value must be given
  42      * for the {@link #className()} element.
  43      */
  44     Class<?> value() default ClassSubstitution.class;
  45 
  46     /**
  47      * Specifies the original class or classes if a single class is being used for multiple
  48      * substitutions.
  49      * <p>
  50      * This method is provided for cases where the original class is not accessible (according to
  51      * Java language access control rules).
  52      * <p>
  53      * If the default value is specified for this element, then a non-default value must be given
  54      * for the {@link #value()} element.
  55      */
  56     String[] className() default {};
  57 
  58     /**
  59      * Determines if the substitutions are for classes that may not be part of the runtime.
  60      * Substitutions for such classes are omitted if the original classes cannot be found.
  61      */
  62     boolean optional() default false;
  63 }