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.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package com.sun.tools.javac.util;

    27 

    28 

    29 /**

    30  * Simple facility for unconditional assertions.

    31  * The methods in this class are described in terms of equivalent assert

    32  * statements, assuming that assertions have been enabled.

    33  *

    34  *  <p><b>This is NOT part of any supported API.

    35  *  If you write code that depends on this, you do so at your own risk.

    36  *  This code and its internal interfaces are subject to change or

    37  *  deletion without notice.</b>

    38  */

    39 public class Assert {

    40     /** Equivalent to

    41      *   assert cond;

    42      */

    43     public static void check(boolean cond) {

    44         if (!cond)

    45             error();

    46     }

    47 

    48     /** Equivalent to

    49      *   assert (o == null);

    50      */

    51     public static void checkNull(Object o) {

    52         if (o != null)

    53             error();

    54     }

    55 

    56     /** Equivalent to

    57      *   assert (t != null); return t;

    58      */

    59     public static <T> T checkNonNull(T t) {

    60         if (t == null)

    61             error();

    62         return t;

    63     }

    64 

    65     /** Equivalent to

    66      *   assert cond : value;

    67      */

    68     public static void check(boolean cond, int value) {

    69         if (!cond)

    70             error(String.valueOf(value));

    71     }

    72 

    73     /** Equivalent to

    74      *   assert cond : value;

    75      */

    76     public static void check(boolean cond, long value) {

    77         if (!cond)

    78             error(String.valueOf(value));

    79     }

    80 

    81     /** Equivalent to

    82      *   assert cond : value;

    83      */

    84     public static void check(boolean cond, Object value) {

    85         if (!cond)

    86             error(String.valueOf(value));

    87     }

    88 

    89     /** Equivalent to

    90      *   assert cond : value;

    91      */

    92     public static void check(boolean cond, String msg) {

    93         if (!cond)

    94             error(msg);

    95     }

    96 

    97     /** Equivalent to

    98      *   assert (o == null) : value;

    99      */

   100     public static void checkNull(Object o, Object value) {

   101         if (o != null)

   102             error(String.valueOf(value));

   103     }

   104 

   105     /** Equivalent to

   106      *   assert (o == null) : value;

   107      */

   108     public static void checkNull(Object o, String msg) {

   109         if (o != null)

   110             error(msg);

   111     }

   112 

   113     /** Equivalent to

   114      *   assert (o != null) : value;

   115      */

   116     public static <T> T checkNonNull(T t, String msg) {

   117         if (t == null)

   118             error(msg);

   119         return t;

   120     }

   121 

   122     /** Equivalent to

   123      *   assert false;

   124      */

   125     public static void error() {

   126         throw new AssertionError();

   127     }

   128 

   129     /** Equivalent to

   130      *   assert false : msg;

   131      */

   132     public static void error(String msg) {

   133         throw new AssertionError(msg);

   134     }

   135 

   136     /** Prevent instantiation. */

   137     private Assert() { }

   138 }