Application: gvSIG desktop

package org.gvsig.expressionevaluator.spi.formatter.value;

import java.util.List;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.expressionevaluator.ExpressionBuilder;

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

import org.gvsig.expressionevaluator.ExpressionBuilder.Function;

import org.gvsig.expressionevaluator.ExpressionBuilder.Value;

import org.gvsig.expressionevaluator.Formatter;

import org.gvsig.tools.dataTypes.DataTypes;

/**

 *

 * @author jjdelcerro

 */

public class Cast implements Formatter<Value> {

    private final Formatter<Value> formatter;

    public Cast(Formatter<Value> formatter) {

        this.formatter = formatter;

    }

    @Override

    public boolean canApply(ExpressionBuilder.Value value) {

        if (value instanceof ExpressionBuilder.Function) {

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

        }

        return false;

    }

    @Override

    public String format(Value function0) {

        Function function = (Function) function0;

        StringBuilder builder = new StringBuilder();

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

        String typeName = (String)((ExpressionBuilder.Constant)args.get(1)).value();

        if(StringUtils.equalsIgnoreCase(typeName, DataTypes.STRING_NAME)){

            typeName = "TEXT";

        }

        builder.append("CAST(");

        builder.append(args.get(0).toString(formatter));

        builder.append(" AS ");

        builder.append(typeName);

        builder.append(")");

        return builder.toString();

    }

}