com.scarabsoft.jrest.converter.GsonConverter Maven / Gradle / Ivy

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package com.scarabsoft.jrest.converter;

import com.google.gson.*;
import com.google.gson.stream.JsonReader;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Type;
import java.util.Collection;

public class GsonConverter implements Converter {

    private final TypeAdapter typeAdapter;

    private final Type type;

    public GsonConverter(TypeAdapter typeAdapter, Type type) {
        this.typeAdapter = typeAdapter;
        this.type = type;
    }


    @Override
    public T convert(InputStream inputStream) throws IOException {
        if (typeAdapter == null) {
            return null;
        }
        return typeAdapter.read(new JsonReader(new InputStreamReader(inputStream)));
    }

    @Override
    public Collection convertCollection(InputStream inputStream, Class collectionClazz) throws IOException {
        JsonParser parser = new JsonParser();
        JsonElement parse = parser.parse(new JsonReader(new InputStreamReader(inputStream,"UTF-8")));
        Collection data = null;
        try {
            data = collectionClazz.newInstance();
            JsonArray rootArray = parse.getAsJsonArray();
            for (JsonElement json : rootArray) {
                try {
                    data.add((T)new Gson().fromJson(json, type));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return data;
    }
}