org.gkh.racf.JSONUtil.java Source code

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/*******************************************************************************
 * Copyright (c) 2015 Unpublished Work of NetIQ, Inc. All Rights Reserved.
 * 
 * THIS WORK IS AN UNPUBLISHED WORK AND CONTAINS CONFIDENTIAL,
 * PROPRIETARY AND TRADE SECRET INFORMATION OF NOVELL, INC. ACCESS TO
 * THIS WORK IS RESTRICTED TO (I) NOVELL, INC. EMPLOYEES WHO HAVE A NEED
 * TO KNOW HOW TO PERFORM TASKS WITHIN THE SCOPE OF THEIR ASSIGNMENTS AND
 * (II) ENTITIES OTHER THAN NOVELL, INC. WHO HAVE ENTERED INTO
 * APPROPRIATE LICENSE AGREEMENTS. NO PART OF THIS WORK MAY BE USED,
 * PRACTICED, PERFORMED, COPIED, DISTRIBUTED, REVISED, MODIFIED,
 * TRANSLATED, ABRIDGED, CONDENSED, EXPANDED, COLLECTED, COMPILED,
 * LINKED, RECAST, TRANSFORMED OR ADAPTED WITHOUT THE PRIOR WRITTEN
 * CONSENT OF NOVELL, INC. ANY USE OR EXPLOITATION OF THIS WORK WITHOUT
 * AUTHORIZATION COULD SUBJECT THE PERPETRATOR TO CRIMINAL AND CIVIL
 * LIABILITY.
 *  
 * ========================================================================
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package org.gkh.racf;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Scanner;

import org.codehaus.jettison.json.JSONArray;
import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JSONUtil {

    public static JSONObject getJSONAsResource(String path) throws JSONException {
        InputStream in = JSONParserTemplateBuilder.class.getResourceAsStream(path);

        Scanner scanner = new Scanner(in, "UTF-8");
        String json = scanner.useDelimiter("\\A").next();
        scanner.close();

        if (isValidJSON(json)) {
            return new JSONObject(json);
        }

        return null;
    }

    public static JSONObject getJSONFromFile(String path) throws IOException, JSONException {
        // (1) Read JSON file into a string and attempt to parse it.
        byte[] encoded = Files.readAllBytes(Paths.get(path));
        String json = new String(encoded, "UTF-8");

        if (isValidJSON(json)) {
            return new JSONObject(json);
        }

        return null;
    }

    /**
     * Note: Uses Jackson.
     * 
     * @see <a herf=
     *      "http://stackoverflow.com/questions/15791878/reliable-json-string-validator-in-java"
     *      >Reliable JSON String Validator</a>
     * 
     * @param text
     * @return
     */
    public static boolean isValidJSONUsingJackson(String text) {
        try {
            JsonFactory factory = new JsonFactory();
            JsonParser parser = factory.createJsonParser(text);
            JsonParser jp = new ObjectMapper().getJsonFactory().createJsonParser(text);
        } catch (JsonParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return true;
    }

    /**
     * Using Jettison...
     * 
     * @see <a
     *      href="http://stackoverflow.com/questions/10174898/how-to-check-whether-a-given-string-is-valid-json-in-java">Check
     *      That Given String is Valid JSON</a>
     * 
     * @param text
     * @return
     */
    public static boolean isValidJSON(String text) {
        try {
            new JSONObject(text);
        } catch (JSONException e) {
            // in case JSONArray is valid as well...
            try {
                new JSONArray(text);
            } catch (JSONException e1) {
                return false;
            }
        }
        return true;
    }
}