Application: gvSIG desktop

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

import org.apache.commons.lang3.StringUtils;

import org.gvsig.expressionevaluator.ExpressionBuilder;

import org.gvsig.expressionevaluator.ExpressionBuilder.Function;

import org.gvsig.expressionevaluator.ExpressionBuilder.Value;

import org.gvsig.expressionevaluator.Formatter;

import static org.gvsig.fmap.dal.DataManager.FUNCTION_EXISTS;

import org.gvsig.fmap.dal.SQLBuilder;

/**

 *

 * @author jjdelcerro

 */

public class Exists implements Formatter<Value> {

    private final SQLBuilder sqlbuilder;

    private final Formatter<Value> formatter;

    public Exists(SQLBuilder sqlbuilder, Formatter<Value> formatter) {

        this.sqlbuilder = sqlbuilder;

        this.formatter = formatter;

    }

    @Override

    public boolean canApply(ExpressionBuilder.Value value) {

        if (value instanceof ExpressionBuilder.Function) {

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

        }

        return false;

    }

    @Override

    public String format(Value function0) {

        Function function = (Function) function0;

        Value exp = function.parameters().get(0);

        return "NVL2(COALESCE("+exp.toString(formatter)+"),TRUE,FALSE)";

    }

}