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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.math.BigInteger;
import java.util.Map;

import org.openrdf.model.Literal;

import com.bigdata.bop.BOp;
import com.bigdata.bop.IBindingSet;
import com.bigdata.bop.IValueExpression;
import com.bigdata.rdf.error.SparqlTypeErrorException;
import com.bigdata.rdf.internal.IV;
import com.bigdata.rdf.internal.impl.literal.XSDIntegerIV;
import com.bigdata.rdf.sparql.ast.GlobalAnnotations;

public class StrlenBOp extends IVValueExpression implements INeedsMaterialization {

    private static final long serialVersionUID = 4176318782528605454L;

    public StrlenBOp(final IValueExpression x, 
    		final GlobalAnnotations globals) {
        super(x, globals);
    }

    public StrlenBOp(BOp[] args, Map anns) {
        super(args, anns);
        if (args.length != 1 || args[0] == null)
            throw new IllegalArgumentException();

    }

    public StrlenBOp(StrlenBOp op) {
        super(op);
    }

	@Override
	public Requirement getRequirement() {
		return Requirement.SOMETIMES;
	}

	@Override
    public IV get(final IBindingSet bs) throws SparqlTypeErrorException {
        
        final Literal lit = getAndCheckLiteralValue(0, bs);
        final String label = lit.getLabel();
        final int length = label.length();
        return new XSDIntegerIV(BigInteger.valueOf(length));
        
    }

}