1 /*
   2  * Copyright (c) 2011, 2012, 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 package com.apple.jobjc;
  26 
  27 import javax.tools.annotation.GenerateNativeHeader;
  28 
  29 /* No native methods here, but the constants are needed in the supporting JNI code */
  30 @GenerateNativeHeader
  31 public class Function {
  32     private static native long getFxnPtrForFunctionName(final String functionName);
  33     private static native long getFxnPtrForFunctionNameAndLib(final long libPtr, final String functionName);
  34 
  35     final long fxnPtr;
  36 
  37     Function(final long fxnPtr) {
  38         this.fxnPtr = fxnPtr;
  39     }
  40 
  41     public Function(final String name) {
  42         this(getFxnPtr(name));
  43     }
  44 
  45     public Function(final MacOSXFramework framework, final String name) {
  46         this(getFxnPtr(name, framework));
  47     }
  48 
  49     static long getFxnPtr(final String name){
  50         long fxnPtr = getFxnPtrForFunctionName(name);
  51         if(fxnPtr == 0) throw new RuntimeException("Function pointer for " + name + " not found in runtime.");
  52         return fxnPtr;
  53     }
  54 
  55     static long getFxnPtr(final String name, final MacOSXFramework framework){
  56         long fxnPtr = 0;
  57         for(int i = 0; fxnPtr == 0 && i < framework.nativeLibPtrs.length; i++){
  58             fxnPtr = getFxnPtrForFunctionNameAndLib(framework.nativeLibPtrs[i], name);
  59             if(fxnPtr != 0) return fxnPtr;
  60         }
  61         throw new RuntimeException("Function pointer for " + name + " not found in framework " + framework + ".");
  62     }
  63 }