org.emoncms.com.http.json.FromJson.java Source code

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Here is the source code for org.emoncms.com.http.json.FromJson.java

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/* 
 * Copyright 2016-18 ISC Konstanz
 * 
 * This file is part of emonjava.
 * For more information visit https://github.com/isc-konstanz/emonjava
 * 
 * Emonjava is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Emonjava is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with emonjava.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.emoncms.com.http.json;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonSyntaxException;

public class FromJson {

    private final Gson gson;
    private final JsonElement jse;

    public FromJson(String jsonString) {

        gson = new Gson();
        jse = gson.fromJson(jsonString, JsonElement.class);
    }

    public boolean isValidObject() {

        return !jse.isJsonNull() && jse.isJsonObject();
    }

    public boolean isValidArray() {

        return !jse.isJsonNull() && jse.isJsonArray();
    }

    public Gson getGson() {

        return gson;
    }

    public JsonObject getJsonObject() {

        return jse.getAsJsonObject();
    }

    public JsonArray getJsonArray() {

        return jse.getAsJsonArray();
    }

    public Object getObject(Class<?> objectClass) throws ClassCastException, JsonSyntaxException {

        return gson.fromJson(jse, objectClass);
    }

    public ArrayList<Object> getArrayList(Class<?> objectClass) throws ClassCastException, JsonSyntaxException {

        ArrayList<Object> objectList = new ArrayList<Object>();
        JsonArray jsa = jse.getAsJsonArray();

        for (JsonElement objectJson : jsa) {
            Object object = gson.fromJson(objectJson, objectClass);
            objectList.add(object);
        }
        return objectList;
    }

    public Double[] getDoubleArray() {

        Double doubleArray[] = null;

        if (!jse.isJsonNull() && jse.isJsonArray()) {
            doubleArray = gson.fromJson(jse, Double[].class);
        }
        return doubleArray;
    }

    public LinkedList<Double[]> getDoubleArrayList() {

        LinkedList<Double[]> resultList = new LinkedList<Double[]>();

        if (!jse.isJsonNull() && jse.isJsonArray()) {
            JsonArray jsa = jse.getAsJsonArray();

            Iterator<JsonElement> iteratorJsonArray = jsa.iterator();
            while (iteratorJsonArray.hasNext()) {
                resultList.add(gson.fromJson(iteratorJsonArray.next(), Double[].class));
            }
        }
        if (resultList.size() == 0) {
            resultList = null;
        }
        return resultList;
    }
}