/*******************************************************************************
 * ============LICENSE_START==================================================
 * * org.onap.dmaap
 * * ===========================================================================
 * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 * * ===========================================================================
 * * Licensed under the Apache License, Version 2.0 (the "License");
 * * you may not use this file except in compliance with the License.
 * * You may obtain a copy of the License at
 * *
 *  *      http://www.apache.org/licenses/LICENSE-2.0
 * *
 *  * Unless required by applicable law or agreed to in writing, software
 * * distributed under the License is distributed on an "AS IS" BASIS,
 * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * * See the License for the specific language governing permissions and
 * * limitations under the License.
 * * ============LICENSE_END====================================================
 * *
 * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 * *
 ******************************************************************************/


package org.onap.dmaap.datarouter.provisioning.utils;

import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Collection;

/**
 * Some utility functions used when creating/validating JSON.
 *
 * @author Robert Eby
 * @version $Id: JSONUtilities.java,v 1.1 2013/04/26 21:00:26 eby Exp $
 */
public class JSONUtilities {

    private static final EELFLogger intlogger = EELFManager.getInstance().getLogger("InternalLog");

    private JSONUtilities(){

    }
    /**
     * Does the String <i>v</i> represent a valid Internet address (with or without a
     * mask length appended).
     *
     * @param v the string to check
     * @return true if valid, false otherwise
     */
    public static boolean validIPAddrOrSubnet(String v) {
        String[] pp = {v, ""};
        if (v.indexOf('/') > 0)
            pp = v.split("/");
        try {
            InetAddress addr = InetAddress.getByName(pp[0]);
            if (pp[1].length() > 0) {
                // check subnet mask
                int mask = Integer.parseInt(pp[1]);
                if (mask > (addr.getAddress().length * 8))
                    return false;
            }
            return true;
        } catch (UnknownHostException e) {
            intlogger.error("PROV0001: " + e.getMessage(), e);
            return false;
        }
    }

    /**
     * Build a JSON array from a collection of Strings.
     *
     * @param coll the collection
     * @return a String containing a JSON array
     */
    public static String createJSONArray(Collection<String> coll) {
        StringBuilder sb = new StringBuilder("[");
        String pfx = "\n";
        for (String t : coll) {
            sb.append(pfx).append("  \"").append(t).append("\"");
            pfx = ",\n";
        }
        sb.append("\n]\n");
        return sb.toString();
    }
}