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package ru.curs.celesta.dbutils.term;

import ru.curs.celesta.dbutils.QueryBuildingHelper;
import ru.curs.celesta.dbutils.stmt.ParameterSetter;

import java.util.List;

/**
 * Comparision of a field with null.
 */
public final class IsNull extends WhereTerm {

    // quoted column name
    private final String fieldName;

    public IsNull(String fieldName) {
        this.fieldName = fieldName;
    }

    @Override
    public String getWhere() {
        return String.format("(%s is null)", fieldName);
    }

    @Override
    public void programParams(List program, QueryBuildingHelper queryBuildingHelper) {
        // do nothing - no parameters
    }

}