/**
 * END USER LICENSE AGREEMENT (“EULA”)
 *
 * READ THIS AGREEMENT CAREFULLY (date: 9/13/2011):
 * http://www.akiban.com/licensing/20110913
 *
 * BY INSTALLING OR USING ALL OR ANY PORTION OF THE SOFTWARE, YOU ARE ACCEPTING
 * ALL OF THE TERMS AND CONDITIONS OF THIS AGREEMENT. YOU AGREE THAT THIS
 * AGREEMENT IS ENFORCEABLE LIKE ANY WRITTEN AGREEMENT SIGNED BY YOU.
 *
 * IF YOU HAVE PAID A LICENSE FEE FOR USE OF THE SOFTWARE AND DO NOT AGREE TO
 * THESE TERMS, YOU MAY RETURN THE SOFTWARE FOR A FULL REFUND PROVIDED YOU (A) DO
 * NOT USE THE SOFTWARE AND (B) RETURN THE SOFTWARE WITHIN THIRTY (30) DAYS OF
 * YOUR INITIAL PURCHASE.
 *
 * IF YOU WISH TO USE THE SOFTWARE AS AN EMPLOYEE, CONTRACTOR, OR AGENT OF A
 * CORPORATION, PARTNERSHIP OR SIMILAR ENTITY, THEN YOU MUST BE AUTHORIZED TO SIGN
 * FOR AND BIND THE ENTITY IN ORDER TO ACCEPT THE TERMS OF THIS AGREEMENT. THE
 * LICENSES GRANTED UNDER THIS AGREEMENT ARE EXPRESSLY CONDITIONED UPON ACCEPTANCE
 * BY SUCH AUTHORIZED PERSONNEL.
 *
 * IF YOU HAVE ENTERED INTO A SEPARATE WRITTEN LICENSE AGREEMENT WITH AKIBAN FOR
 * USE OF THE SOFTWARE, THE TERMS AND CONDITIONS OF SUCH OTHER AGREEMENT SHALL
 * PREVAIL OVER ANY CONFLICTING TERMS OR CONDITIONS IN THIS AGREEMENT.
 */

package com.akiban.server.expression.std;

import com.akiban.server.error.WrongExpressionArityException;
import com.akiban.server.expression.Expression;
import com.akiban.server.expression.ExpressionComposer;
import com.akiban.server.expression.ExpressionEvaluation;
import com.akiban.server.expression.ExpressionType;
import com.akiban.server.service.functions.Scalar;
import com.akiban.server.types.AkType;
import com.akiban.server.types.NullValueSource;
import com.akiban.server.types.ValueSource;
import com.akiban.server.types.extract.Extractors;
import com.akiban.server.types.extract.ObjectExtractor;
import com.akiban.sql.StandardException;
import com.akiban.server.expression.TypesList;

public class LengthExpression  extends AbstractUnaryExpression
{
    @Scalar ("getDB2Length")
    public static final ExpressionComposer COMPOSER = new UnaryComposer ()
    {
        @Override
        protected Expression compose(Expression argument) 
        {
            return new LengthExpression(argument);
        }

        @Override
        public ExpressionType composeType(TypesList argumentTypes) throws StandardException
        {
            if (argumentTypes.size() != 1)
                throw new WrongExpressionArityException(1, argumentTypes.size());
            return ExpressionTypes.LONG;
        }
    };
        
    private static final class InnerEvaluation extends AbstractUnaryExpressionEvaluation
    {
        public InnerEvaluation (ExpressionEvaluation ev)
        {
            super(ev);
        }

        @Override
        public ValueSource eval() 
        {
           ValueSource source = this.operand();
           if (source.isNull()) return NullValueSource.only();
           
           ObjectExtractor<String> sExtractor = Extractors.getStringExtractor();
           String st = sExtractor.getObject(source);

           valueHolder().putLong(st.length());
           return valueHolder();
        }        
    }
    
    public LengthExpression (Expression e)
    {
        super(AkType.LONG, e);
    }

    @Override
    protected String name() 
    {
        return "Length";
    }

    @Override
    public ExpressionEvaluation evaluation() 
    {
        return new InnerEvaluation(this.operandEvaluation());
    }    
}

@@ -2007,14 +2007,12 @@
 r (%22
-getDB2
+char
 Leng

change getDB2Length to charLength in LengthExpression, because the length obtained by Java's String.length is char length, not byte-length