com.ryanantkowiak.jOptionsHouseAPI.JsonUtilities.java Source code

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Here is the source code for com.ryanantkowiak.jOptionsHouseAPI.JsonUtilities.java

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/*
 * Copyright (c) 2013 Ryan Antkowiak (antkowiak@gmail.com).
 * All rights reserved.
 * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
 * You may study, use, and modify it for any non-commercial purpose.
 * You may distribute it non-commercially as long as you retain this notice.
 * For a commercial use license, contact antkowiak@gmail.com.
 */
package com.ryanantkowiak.jOptionsHouseAPI;

import java.util.Map;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonPrimitive;

/**
 * Collection of static utility methods for using JSON strings and objects.
 * 
 * @author Ryan Antkowiak (antkowiak@gmail.com)
 */
public class JsonUtilities {

    /**
     * Recursively print the contents of a JSON string
     * 
     * @param text the JSON string
     */
    public static void printJson(String text) {
        JsonParser parser = new JsonParser();
        JsonElement element = parser.parse(text);
        printJson(element, "[root]");
    }

    /**
     * Recursively print the contents of a GSON JSON element.
     * 
     * @param element   the GSON JSON element to be printed
     * @param prefix   output will be prefixed with this string
     */
    public static void printJson(JsonElement element, String prefix) {
        if (null == prefix || prefix.isEmpty()) {
            prefix = "";
        }

        if (null == element || element.isJsonNull()) {
            System.out.println(prefix + " [null]");
            return;
        }

        else if (element.isJsonPrimitive()) {
            JsonPrimitive p = element.getAsJsonPrimitive();
            if (p.isBoolean()) {
                System.out.println(prefix + " [bool=" + p.getAsBoolean() + "]");
            } else if (p.isString()) {
                System.out.println(prefix + " [string='" + p.getAsString() + "']");
            } else if (p.isNumber()) {
                System.out.println(prefix + " [number=" + p.getAsDouble() + "]");
            }
        }

        else if (element.isJsonArray()) {
            System.out.println(prefix + " [array]");
            for (int i = 0; i < element.getAsJsonArray().size(); ++i) {
                String newPrefix = prefix + "[" + i + "]";
                printJson(element.getAsJsonArray().get(i), newPrefix);
            }
        }

        else if (element.isJsonObject()) {
            JsonObject obj = element.getAsJsonObject();

            for (Map.Entry<String, JsonElement> entry : obj.entrySet()) {
                String key = entry.getKey();
                JsonElement value = entry.getValue();
                String newPrefix = prefix + "." + key;
                printJson(value, newPrefix);
            }
        }

    }

}