/*
 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.apple.jobjc;

import javax.tools.annotation.GenerateNativeHeader;

/* No native methods here, but the constants are needed in the supporting JNI code */
@GenerateNativeHeader
public class Function {
    private static native long getFxnPtrForFunctionName(final String functionName);
    private static native long getFxnPtrForFunctionNameAndLib(final long libPtr, final String functionName);

    final long fxnPtr;

    Function(final long fxnPtr) {
        this.fxnPtr = fxnPtr;
    }

    public Function(final String name) {
        this(getFxnPtr(name));
    }

    public Function(final MacOSXFramework framework, final String name) {
        this(getFxnPtr(name, framework));
    }

    static long getFxnPtr(final String name){
        long fxnPtr = getFxnPtrForFunctionName(name);
        if(fxnPtr == 0) throw new RuntimeException("Function pointer for " + name + " not found in runtime.");
        return fxnPtr;
    }

    static long getFxnPtr(final String name, final MacOSXFramework framework){
        long fxnPtr = 0;
        for(int i = 0; fxnPtr == 0 && i < framework.nativeLibPtrs.length; i++){
            fxnPtr = getFxnPtrForFunctionNameAndLib(framework.nativeLibPtrs[i], name);
            if(fxnPtr != 0) return fxnPtr;
        }
        throw new RuntimeException("Function pointer for " + name + " not found in framework " + framework + ".");
    }
}
