/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2003-2008 University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.config;

import javax.annotation.Nonnull;

/**
 * @author pugh
 */
public class InvocationEnvironment {
    /**
     *
     */
    private static final String UNKNOWN = "unknown";
    static String invocationEnvironment = null;
    public static @Nonnull String get() {
        if (invocationEnvironment == null)
            return UNKNOWN;
        return invocationEnvironment;
    }

    public static void set(@Nonnull String invocation) {
       if (InvocationEnvironment.invocationEnvironment == null) {
           InvocationEnvironment.invocationEnvironment = invocation;
           return;
       }
       if (InvocationEnvironment.invocationEnvironment.equals(invocation))
           return;
       throw new IllegalArgumentException("Can't change invocation environment from "
               + InvocationEnvironment.invocationEnvironment
               + " to "
               + invocation);
    }

}