at.ac.tuwien.dsg.smartcom.integration.JSONConverter.java Source code

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Here is the source code for at.ac.tuwien.dsg.smartcom.integration.JSONConverter.java

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/**
 * Copyright (c) 2014 Technische Universitat Wien (TUW), Distributed Systems Group E184 (http://dsg.tuwien.ac.at)
 *
 * This work was partially supported by the EU FP7 FET SmartSociety (http://www.smart-society-project.eu/).
 *
 *    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.
 */
package at.ac.tuwien.dsg.smartcom.integration;

import at.ac.tuwien.dsg.smartcom.callback.exception.NoSuchCollectiveException;
import at.ac.tuwien.dsg.smartcom.callback.exception.NoSuchPeerException;
import at.ac.tuwien.dsg.smartcom.model.*;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public final class JSONConverter {
    private static final Logger log = LoggerFactory.getLogger(JSONConverter.class);

    public static class ConverterException extends Exception {

    }

    public static CollectiveInfo getCollectiveInfo(Identifier collective, String content)
            throws NoSuchCollectiveException {
        CollectiveInfo info = new CollectiveInfo();
        info.setId(collective);
        info.setDeliveryPolicy(DeliveryPolicy.Collective.TO_ALL_MEMBERS); //fake value

        final List<Identifier> peerIDs = new ArrayList<>();
        info.setPeers(peerIDs);

        JSONObject jsonOutput = (JSONObject) JSONValue.parse(content);
        String[] strings = parseResults(jsonOutput);

        if (strings == null) {
            throw new NoSuchCollectiveException();
        }

        for (String string : strings) {
            peerIDs.add(Identifier.peer(string));
        }

        return info;
    }

    public static PeerInfo getPeerInfo(Identifier peerId, String content) throws NoSuchPeerException {
        JSONObject jsonOutput = (JSONObject) JSONValue.parse(content);

        String[][] strings = parsePeerInfoResults(jsonOutput);

        if (strings == null) {
            throw new NoSuchPeerException(peerId);
        }

        PeerInfo info = new PeerInfo();
        info.setId(peerId);
        info.setPrivacyPolicies(null);

        Map<String, PeerChannelAddress> map = new HashMap<>();

        for (String[] string : strings) {
            info.setDeliveryPolicy(DeliveryPolicy.Peer.values()[(int) Integer.valueOf(string[3])]);

            String id = string[2];

            PeerChannelAddress address = map.get(id);
            if (address == null) {
                address = new PeerChannelAddress();
                address.setPeerId(peerId);
                address.setContactParameters(new ArrayList<String>());
                address.setChannelType(Identifier.channelType(string[4]));
                map.put(id, address);
            }

            if (address.getContactParameters() == null) {
                address.setContactParameters(new ArrayList<String>());
            }

            ArrayList<String> list = (ArrayList<String>) address.getContactParameters();
            list.add(string[5]);
        }

        List<PeerChannelAddress> addresses = new ArrayList<>(map.values());
        info.setAddresses(addresses);

        return info;
    }

    private static String[][] parsePeerInfoResults(JSONObject json) {
        if (json.containsKey("results")) {
            JSONArray array = (JSONArray) json.get("results");

            if (array.size() == 0) {
                return null;
            }

            List<String[]> outerList = new ArrayList<>();
            for (Object o : array) {
                JSONArray innerArray = (JSONArray) o;
                List<String> valueList = new ArrayList<>();

                for (Object ob : innerArray) {
                    try {
                        valueList.add(parseToString(ob));
                    } catch (ConverterException e) {
                        return null;
                    }
                }
                outerList.add(valueList.toArray(new String[valueList.size()]));
            }

            return outerList.toArray(new String[outerList.size()][]);
        } else {
            return null;
        }
    }

    private static String[] parseResults(JSONObject json) {
        List<String> valueList = new ArrayList<>();

        if (json.containsKey("results")) {
            JSONArray array = (JSONArray) json.get("results");

            for (Object obj : array) {
                JSONArray innerArray = (JSONArray) obj;

                for (Object o : innerArray) {
                    try {
                        valueList.add(parseToString(o));
                    } catch (ConverterException e) {
                        return null;
                    }
                }
            }

            return valueList.toArray(new String[valueList.size()]);
        } else {
            return null;
        }
    }

    private static String parseToString(Object obj) throws ConverterException {
        if (obj == null) {
            throw new ConverterException();
        }

        String result;

        if (obj instanceof String) {
            result = (String) obj;
        } else {
            result = String.valueOf(obj);
        }

        if (result == null || "null".equals(result)) {
            throw new ConverterException();
        }

        return result;
    }
}