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/**

Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     [email protected]

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program 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 for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package com.bigdata.rdf.internal.constraints;

import java.util.Map;

import com.bigdata.bop.BOp;
import com.bigdata.bop.IConstant;
import com.bigdata.bop.IConstraint;
import com.bigdata.bop.IValueExpression;
import com.bigdata.bop.NV;
import com.bigdata.rdf.internal.IV;
import com.bigdata.rdf.sparql.ast.GlobalAnnotations;

/**
 * Abstract base class for "IN" {@link IConstraint} implementations.
 *
 * @author Bryan Thompson
 * @version $Id: INConstraint.java 4286 2011-03-09 17:36:10Z mrpersonick $
 */
abstract public class InBOp extends XSDBooleanIVValueExpression {

	private static final long serialVersionUID = -774833617971700165L;

    public interface Annotations extends
            XSDBooleanIVValueExpression.Annotations {

        /**
         * true iff this is "NOT IN" rather than "IN".
         */
        String NOT = InBOp.class.getName() + ".not";

    }

    @SuppressWarnings("rawtypes")
    private static BOp[] mergeArguments(//
            final IValueExpression var,
            final IConstant... set) {

        final BOp args[] = new BOp[1 + (set != null ? set.length : 0)];

        args[0] = var;

        for (int i = 0; i < set.length; i++) {

            args[i + 1] = set[i];

        }

        return args;

    }

    @SuppressWarnings("rawtypes")
    public InBOp(//
            final boolean not, //
            final IValueExpression var,//
            final IConstant... set//
            ) {

        this(mergeArguments(var, set), 
        		NV.asMap(Annotations.NOT, Boolean.valueOf(not)));
        
    }

    /**
     * @param op
     */
    public InBOp(final InBOp op) {

        super(op);

    }

    /**
     * @param args
     * @param annotations
     */
    public InBOp(final BOp[] args, final Map annotations) {

        super(args, annotations);

        if (getProperty(Annotations.NOT) == null)
            throw new IllegalArgumentException();

        @SuppressWarnings("rawtypes")
        final IValueExpression var = get(0);

        if (var == null)
            throw new IllegalArgumentException();

        if (arity() < 2) {
            throw new IllegalArgumentException();
        }

    }

    /**
     * The value expression to be tested.
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public IValueExpression getValueExpression() {

        return (IValueExpression) get(0);

    }

    /**
     * The remaining arguments to the IN/NOT IN function, which must be a set of
     * constants.
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public IConstant[] getSet() {

        final IConstant[] set = new IConstant[arity() - 1];

        for (int i = 1; i < arity(); i++) {

            set[i - 1] = (IConstant) get(i);

        }

        return set;

    }

}