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/*
 * 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.plan;

/**
 * An ordering constraint which must be taken into account when Detectors are
 * run.
 *
 * @see edu.umd.cs.findbugs.Plugin
 * @see edu.umd.cs.findbugs.plan.ExecutionPlan
 * @author David Hovemeyer
 */
public class DetectorOrderingConstraint {
    private final DetectorFactorySelector earlier;

    private final DetectorFactorySelector later;

    private boolean singleSource;

    public DetectorOrderingConstraint(DetectorFactorySelector earlier, DetectorFactorySelector later) {
        this.earlier = earlier;
        this.later = later;
    }

    /**
     * Set whether or not this ordering constraint resulted from an ordering
     * constraint having a single detector as its source (earlier detector). Such
     * constraints automatically enable the source (earlier) detector if the
     * target (later) detector is enabled.
     */
    public void setSingleSource(boolean singleSource) {
        this.singleSource = singleSource;
    }

    /**
     * Determine whether or not this ordering constraint resulted from an
     * ordering constraint having a single detector as its source (earlier
     * detector). Such constraints automatically enable the source (earlier)
     * detector if the target (later) detector is enabled.
     *
     * @return true if this edge has a single detector as its source (earlier
     *         detector)
     */
    public boolean isSingleSource() {
        return singleSource;
    }

    public DetectorFactorySelector getEarlier() {
        return earlier;
    }

    public DetectorFactorySelector getLater() {
        return later;
    }

    @Override
    public String toString() {
        return earlier.toString() + " -> " + later.toString();
    }
}