aoqi@0: /*
aoqi@0:  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.tools.javac.util;
aoqi@0: 
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Simple facility for unconditional assertions.
aoqi@0:  * The methods in this class are described in terms of equivalent assert
aoqi@0:  * statements, assuming that assertions have been enabled.
aoqi@0:  *
aoqi@0:  *  <p><b>This is NOT part of any supported API.
aoqi@0:  *  If you write code that depends on this, you do so at your own risk.
aoqi@0:  *  This code and its internal interfaces are subject to change or
aoqi@0:  *  deletion without notice.</b>
aoqi@0:  */
aoqi@0: public class Assert {
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert cond;
aoqi@0:      */
aoqi@0:     public static void check(boolean cond) {
aoqi@0:         if (!cond)
aoqi@0:             error();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert (o == null);
aoqi@0:      */
aoqi@0:     public static void checkNull(Object o) {
aoqi@0:         if (o != null)
aoqi@0:             error();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert (t != null); return t;
aoqi@0:      */
aoqi@0:     public static <T> T checkNonNull(T t) {
aoqi@0:         if (t == null)
aoqi@0:             error();
aoqi@0:         return t;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert cond : value;
aoqi@0:      */
aoqi@0:     public static void check(boolean cond, int value) {
aoqi@0:         if (!cond)
aoqi@0:             error(String.valueOf(value));
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert cond : value;
aoqi@0:      */
aoqi@0:     public static void check(boolean cond, long value) {
aoqi@0:         if (!cond)
aoqi@0:             error(String.valueOf(value));
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert cond : value;
aoqi@0:      */
aoqi@0:     public static void check(boolean cond, Object value) {
aoqi@0:         if (!cond)
aoqi@0:             error(String.valueOf(value));
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert cond : value;
aoqi@0:      */
aoqi@0:     public static void check(boolean cond, String msg) {
aoqi@0:         if (!cond)
aoqi@0:             error(msg);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert (o == null) : value;
aoqi@0:      */
aoqi@0:     public static void checkNull(Object o, Object value) {
aoqi@0:         if (o != null)
aoqi@0:             error(String.valueOf(value));
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert (o == null) : value;
aoqi@0:      */
aoqi@0:     public static void checkNull(Object o, String msg) {
aoqi@0:         if (o != null)
aoqi@0:             error(msg);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert (o != null) : value;
aoqi@0:      */
aoqi@0:     public static <T> T checkNonNull(T t, String msg) {
aoqi@0:         if (t == null)
aoqi@0:             error(msg);
aoqi@0:         return t;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert false;
aoqi@0:      */
aoqi@0:     public static void error() {
aoqi@0:         throw new AssertionError();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Equivalent to
aoqi@0:      *   assert false : msg;
aoqi@0:      */
aoqi@0:     public static void error(String msg) {
aoqi@0:         throw new AssertionError(msg);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Prevent instantiation. */
aoqi@0:     private Assert() { }
aoqi@0: }