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There is a newer version: 2.08alpha
package io.yawp.commons.utils.json;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import io.yawp.repository.Repository;
import org.apache.commons.lang3.StringUtils;

import java.io.BufferedReader;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public abstract class JsonUtilsBase {

    protected JsonUtilsBase() {
    }

    public abstract Object from(Repository r, String json, Type type);

    public abstract String to(Object o);

    public  T from(Repository r, String json, Class clazz) {
        return (T) from(r, json, (Type) clazz);
    }

    public  List fromList(Repository r, String json, Class clazz) {
        return (List) fromListRaw(r, json, clazz);
    }

    @SuppressWarnings("unchecked")
    public List fromListRaw(Repository r, String json, Type valueType) {
        ParameterizedTypeImpl type = new ParameterizedTypeImpl(List.class, new Type[]{valueType}, null);
        return (List) from(r, json, type);
    }

    @SuppressWarnings("unchecked")
    public  Map fromMap(Repository r, String json, Class keyClazz, Class valueClazz) {
        return (Map) fromMapRaw(r, json, keyClazz, valueClazz);
    }

    public Map fromMapRaw(Repository r, String json, Type keyType, Type valueType) {
        ParameterizedTypeImpl type = new ParameterizedTypeImpl(Map.class, new Type[]{keyType, valueType}, null);
        return (Map) from(r, json, type);
    }

    @SuppressWarnings("unchecked")
    public  Map> fromMapList(Repository r, String json, Class keyClazz, Class valueClazz) {
        Type listType = new ParameterizedTypeImpl(List.class, new Type[]{valueClazz}, null);
        Type type = new ParameterizedTypeImpl(Map.class, new Type[]{keyClazz, listType}, null);
        return (Map>) from(r, json, type);
    }

    public String readJson(BufferedReader reader) {
        StringBuilder sb = new StringBuilder();
        String line;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return sb.toString();
    }

    public boolean isJsonArray(String json) {
        if (StringUtils.isEmpty(json)) {
            return false;
        }
        return json.charAt(0) == '[';
    }

    // TODO: remove gson support here
    public List getProperties(String json) {
        List properties = new ArrayList();
        JsonObject jsonObject = new JsonParser().parse(json).getAsJsonObject();
        for (Map.Entry property : jsonObject.entrySet()) {
            properties.add(property.getKey());
        }
        return properties;
    }

}