Application: gvSIG desktop » gvSIG data provider for MS SQLServer

package org.gvsig.mssqlserver.dal.expressionbuilderformatter;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.expressionevaluator.ExpressionBuilder;

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

import org.gvsig.expressionevaluator.ExpressionBuilder.Value;

import org.gvsig.expressionevaluator.ExpressionBuilder.Variable;

import org.gvsig.expressionevaluator.Formatter;

import org.gvsig.fmap.dal.SQLBuilder;

/**

 *

 * @author jjdelcerro

 */

class MSSQLVariable implements Formatter<Value> {

    private final Formatter<Value> formatter;

    private final SQLBuilder builder;

    private final ExpressionBuilder expbuilder;

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

        this.builder = builder;

        this.formatter = formatter;

        this.expbuilder = builder.expression();

    }

    @Override

    public boolean canApply(Value value) {

        return value instanceof Variable;

    }

    @Override

    public String format(Value function) {

        String name = ((Variable) function).name();

        if (StringUtils.isEmpty(name)) {

            return this.expbuilder.toString(EMPTY_FORMATTER);

        }

        return this.builder.as_identifier(name);

    }

}