/*
 * Bytecode Analysis Framework
 * Copyright (C) 2005, 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
 */

/*
 * Created on Feb 22, 2005
 */
package edu.umd.cs.findbugs.ba.npe;

import edu.umd.cs.findbugs.SystemProperties;

/**
 * Knobs for null value analysis.
 * 
 * @author David Hovemeyer
 */
public interface IsNullValueAnalysisFeatures {

    /**
     * Do not downgrade "null on simple path" values to "null on complex path"
     * on control splits.
     */
    public static final boolean NO_SPLIT_DOWNGRADE_NSP = SystemProperties.getBoolean("inva.noSplitDowngradeNSP");

    /**
     * Don't consider switch default cases as exception paths.
     */
    public static final boolean NO_SWITCH_DEFAULT_AS_EXCEPTION = SystemProperties.getBoolean("inva.noSwitchDefaultAsException");

    /**
     * Keep track of an extra branch, so we can distinguish conditionally-null
     * values with two branches from conditionally-null values with three or
     * more branches.
     */
    public static final boolean NCP_EXTRA_BRANCH = SystemProperties.getBoolean("inva.ncpExtraBranch");

    /**
     * If this property is true, then we assume parameters and return values can
     * be null (but aren't definitely null).
     */
    public static final boolean UNKNOWN_VALUES_ARE_NSP = SystemProperties.getBoolean("findbugs.nullderef.assumensp");

    /**
     * If this property is true, then resolution of nullness annotations is
     * based on JSR-305 type qualifiers rather than an AnnotationDatabase.
     */
    public static final boolean USE_TYPE_QUALIFIERS = true; // SystemProperties.getBoolean("findbugs.npe.tq");

}