Application: gvSIG desktop

package org.gvsig.fmap.dal.store.h2.expressionbuilderformatter;

import java.text.MessageFormat;

import java.util.List;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.expressionevaluator.ExpressionBuilder;

import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_IFNULL;

import org.gvsig.expressionevaluator.ExpressionBuilder.Function;

import org.gvsig.expressionevaluator.ExpressionBuilder.Value;

import org.gvsig.expressionevaluator.Formatter;

import org.gvsig.fmap.dal.SQLBuilder;

/**

 *

 * @author jjdelcerro

 */

class IfNull implements Formatter<Value> {

    private final Formatter<Value> formatter;

    private final SQLBuilder builder;

    public IfNull(SQLBuilder builder, Formatter<Value> formatter) {

        this.builder = builder;

        this.formatter = formatter;

    }

    @Override

    public boolean canApply(Value value) {

        if (value instanceof Function) {

            if (value instanceof ExpressionBuilder.Function) {

                return StringUtils.equalsIgnoreCase(FUNCTION_IFNULL, ((Function) value).name());

            }

        }

        return false;

    }

    @Override

    public String format(Value function) {

            List<Value> parameters = ((Function) function).parameters();

            String p1 = parameters.get(0).toString(formatter);

            String p2 = parameters.get(1).toString(formatter);

            String p3 = parameters.get(2).toString(formatter);

            String r = MessageFormat.format(

                    "NVL2({0}, {1}, {2})",

                    p1,

                    p3,

                    p2

            );

            return r;

    }

}