org.dizitart.no2.common.FieldValues Maven / Gradle / Ivy

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package org.dizitart.no2.common;

import lombok.Data;
import org.dizitart.no2.collection.NitriteId;
import org.dizitart.no2.common.tuples.Pair;
import org.dizitart.no2.common.util.StringUtils;

import java.util.ArrayList;
import java.util.List;

/**
 * Represents a collection of field-value pairs, with methods to retrieve
 * values by field name.
 * 
 * @author Anindya Chatterjee
 * @since 4.0
 */
@Data
public class FieldValues {
    private NitriteId nitriteId;
    private Fields fields;
    private List> values;

    public FieldValues() {
        values = new ArrayList<>();
    }

    /**
     * Retrieves the value associated with a given field name.
     * 
     * @param field the name of a field.
     * @return the value.
     */
    public Object get(String field) {
        if (fields.getFieldNames().contains(field)) {
            for (Pair value : values) {
                if (value.getFirst().equals(field)) {
                    return value.getSecond();
                }
            }
        }
        return null;
    }

    /**
     * Returns the {@link Fields} object associated with this instance.
     * 
     * @return an instance of the Fields class.
     */
    public Fields getFields() {
        if (fields != null) {
            return fields;
        }

        this.fields = new Fields();
        List fieldNames = new ArrayList<>();
        for (Pair value : getValues()) {
            if (!StringUtils.isNullOrEmpty(value.getFirst())) {
                fieldNames.add(value.getFirst());
            }
        }
        fields.setFieldNames(fieldNames);
        return fields;
    }
}