1 /*
   2  * Copyright (c) 2020, 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 jdk.internal.loader;
  27 
  28 /**
  29  * NativeLibrary represents a loaded native library instance.
  30  */
  31 public interface NativeLibrary {
  32     String name();
  33 
  34     /**
  35      * Finds the address of the entry of the given name.  Returns 0
  36      * if not found.
  37      *
  38      * @param name the name of the symbol to be found
  39      */
  40     long find(String name);
  41 
  42     /**
  43      * Finds the address of the entry of the given name.
  44      *
  45      * @param name the name of the symbol to be found
  46      * @throws NoSuchMethodException if the named entry is not found.
  47      */
  48     default long lookup(String name) throws NoSuchMethodException {
  49         long addr = find(name);
  50         if (0 == addr) {
  51             throw new NoSuchMethodException("Cannot find symbol " + name + " in library " + name());
  52         }
  53         return addr;
  54     }
  55 }