SiteFieldReaderFactory.java example

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activityinfo-master
package org.activityinfo.legacy.shared.impl;

import org.activityinfo.legacy.shared.model.IndicatorDTO;
import org.activityinfo.legacy.shared.model.SiteDTO;
import org.activityinfo.model.expr.eval.FieldReader;
import org.activityinfo.model.expr.eval.FieldReaderFactory;
import org.activityinfo.model.form.FormField;
import org.activityinfo.model.legacy.CuidAdapter;
import org.activityinfo.model.type.FieldType;
import org.activityinfo.model.type.FieldValue;
import org.activityinfo.model.type.number.Quantity;
import org.activityinfo.model.type.number.QuantityType;

public class SiteFieldReaderFactory implements FieldReaderFactory<SiteDTO> {

    @Override
    public FieldReader<SiteDTO> create(FormField field) {
        if(field.getType() instanceof QuantityType) {
            return new QuantityReader(field);
        } else {
            throw new UnsupportedOperationException("type: " + field.getType());
        }
    }

    private static class QuantityReader implements FieldReader<SiteDTO> {

        private final QuantityType type;
        private final String propertyName;


        public QuantityReader(FormField field) {
            type = (QuantityType) field.getType();
            propertyName = IndicatorDTO.getPropertyName(CuidAdapter.getLegacyIdFromCuid(field.getId()));
        }

        @Override
        public FieldValue readField(SiteDTO record) {
            Object value = record.get(propertyName);
            if(value instanceof Number) {
                return new Quantity(((Number) value).doubleValue(), type.getUnits());
            } else {
                // TODO: Replace with use of an explicit default value when ready
                return new Quantity(0, type.getUnits());
            }
        }

        @Override
        public FieldType getType() {
            return type;
        }
    }
}