001/* 002 * BridJ - Dynamic and blazing-fast native interop for Java. 003 * http://bridj.googlecode.com/ 004 * 005 * Copyright (c) 2010-2013, Olivier Chafik (http://ochafik.com/) 006 * All rights reserved. 007 * 008 * Redistribution and use in source and binary forms, with or without 009 * modification, are permitted provided that the following conditions are met: 010 * 011 * * Redistributions of source code must retain the above copyright 012 * notice, this list of conditions and the following disclaimer. 013 * * Redistributions in binary form must reproduce the above copyright 014 * notice, this list of conditions and the following disclaimer in the 015 * documentation and/or other materials provided with the distribution. 016 * * Neither the name of Olivier Chafik nor the 017 * names of its contributors may be used to endorse or promote products 018 * derived from this software without specific prior written permission. 019 * 020 * THIS SOFTWARE IS PROVIDED BY OLIVIER CHAFIK AND CONTRIBUTORS ``AS IS'' AND ANY 021 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 022 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 023 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY 024 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 025 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 026 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 027 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 028 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 029 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 030 */ 031package org.bridj; 032 033import java.lang.reflect.Constructor; 034import java.lang.reflect.Method; 035 036import static org.bridj.Pointer.*; 037 038/** 039 * Generic C function which invocation involves a bit of Java reflection.<br> 040 * To create a dynamic function, use {@link Pointer#asDynamicFunction(org.bridj.ann.Convention.Style, java.lang.reflect.Type, java.lang.reflect.Type[]) 041 * } or {@link CRuntime#getDynamicFunctionFactory(org.bridj.NativeLibrary, org.bridj.ann.Convention.Style, java.lang.reflect.Type, java.lang.reflect.Type[]) 042 * }. 043 * 044 * @author ochafik 045 * @param R Return type of the function (can be {@link java.lang.Void}) 046 */ 047public abstract class DynamicFunction<R> extends Callback { 048 /// Don't GC the factory, which holds the native callback handle 049 050 DynamicFunctionFactory factory; 051 Method method; 052 053 protected DynamicFunction() { 054 } 055 056 public R apply(Object... args) { 057 try { 058 return (R) method.invoke(this, args); 059 } catch (Throwable th) { 060 th.printStackTrace(); 061 throw new RuntimeException("Failed to invoke callback" + " : " + th, th); 062 } 063 } 064 065 @Override 066 public String toString() { 067 return method.toString(); 068 } 069}