UnixPlatform.java

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 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/epl-v10.html
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 * Copyright (C) 2014 Timur Duehr <tduehr@gmail.com>
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package org.jruby.platform;

import org.jruby.runtime.builtin.IRubyObject;

import java.lang.Class;
import java.lang.reflect.Method;

public class UnixPlatform extends Platform {
    private final Class systemClass;
    private final Object system;
    private final Method groupsMethod;

    protected UnixPlatform() {
        Class sClass = null;
        Object s = null;
        Method g = null;
        try {
            sClass = Class.forName("com.sun.security.auth.module.UnixSystem");
            s = sClass.getDeclaredConstructor().newInstance();
            g = sClass.getDeclaredMethod("getGroups");
        } catch (Exception e) {
            throw new UnsupportedOperationException(e.getMessage(), e);
        }

        systemClass = sClass;
        system = s;
        groupsMethod = g;
    }

    @Override
    public long[] getGroups(IRubyObject recv) {
        if (groupsMethod == null)
            throw recv.getRuntime().newNotImplementedError("groups() function is unimplemented on this platform");

        try {
            return (long[])groupsMethod.invoke(system);
        } catch (Exception e) {
            throw new UnsupportedOperationException("groups() function is unimplemented on this platform", e);
        }
    }
}