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.Code.Constant;

import org.gvsig.expressionevaluator.ExpressionBuilder.Function;

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

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

import org.gvsig.expressionevaluator.ExpressionBuilder.Value;

import org.gvsig.expressionevaluator.Formatter;

import org.gvsig.fmap.dal.SQLBuilder;

/**

 *

 * @author jjdelcerro

 */

class IsNotNull implements Formatter<Value> {

    private final Formatter<Value> formatter;

    private final SQLBuilder builder;

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

        this.builder = builder;

        this.formatter = formatter;

    }

    @Override

    public boolean canApply(Value value_not) {

        if (value_not instanceof Function) {

            // NOT( IS( p1, NULL) )

            if( StringUtils.equalsIgnoreCase(OPERATOR_NOT, ((Function) value_not).name()) ) {

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

                Value value_is = parameters.get(0);

                if( value_is instanceof Function && StringUtils.equalsIgnoreCase(OPERATOR_IS, ((Function)value_is).name()) ) {

                    List<Value> parameters_is = ((Function)value_is).parameters();

                    Value is_p2 = parameters_is.get(1);

                    if( is_p2 instanceof Constant && ((Constant)is_p2).value()==null ) {

                        return true;

                    }

                }

            }

        }

        return false;

    }

    @Override

    public String format(Value value_not) {

        // NOT( IS( p1, NULL) )

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

        Value value_is = parameters.get(0);

        List<Value> parameters_is = ((Function)value_is).parameters();

        Value is_p1 = parameters_is.get(0);

        String r = MessageFormat.format(

                "( ({0}) IS NOT NULL )", 

                is_p1.toString(formatter)

        );

        return r;

    }

}