RealmListConverter.java

import net.vvakame.util.jsonpullparser.JsonFormatException;
import net.vvakame.util.jsonpullparser.JsonPullParser;
import net.vvakame.util.jsonpullparser.util.JsonUtil;
import net.vvakame.util.jsonpullparser.util.OnJsonObjectAddListener;
import net.vvakame.util.jsonpullparser.util.TokenConverter;

import java.io.IOException;
import java.io.Writer;

import io.realm.RealmList;
import io.realm.RealmObject;

/**
 * Created by cattaka on 2016/10/05.
 */
public abstract class RealmListConverter<T extends RealmObject> extends TokenConverter<RealmList<T>> {
    TokenConverter<T> singleConverter;

    public RealmListConverter(TokenConverter<T> singleConverter) {
        this.singleConverter = singleConverter;
    }

    @Override
    public RealmList<T> parse(JsonPullParser parser, OnJsonObjectAddListener listener) throws IOException, JsonFormatException {
        JsonPullParser.State state = parser.getEventType();
        switch (state) {
            case START_ARRAY: {
                RealmList<T> results = new RealmList<>();
                while ((state = parser.lookAhead()) != JsonPullParser.State.END_ARRAY) {
                    results.add(singleConverter.parse(parser, listener));
                }
                return results;
            }
            default: {
                return null;
            }
        }
    }

    @Override
    public void encodeNullToNull(Writer writer, RealmList<T> objs) throws IOException {
        if (objs != null) {
            JsonUtil.startArray(writer);
            boolean first = true;
            for (T obj : objs) {
                if (first) {
                    first = false;
                } else {
                    JsonUtil.addSeparator(writer);
                }
                singleConverter.encodeNullToNull(writer, obj);
            }
            JsonUtil.endArray(writer);
        } else {
            writer.write("null");
        }
    }

}