JsonTools.java

/**
 * Copyright © 2017 The Thingsboard Authors
 *
 * 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 org.thingsboard.gateway.util;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.thingsboard.server.common.data.kv.*;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * Created by ashvayka on 19.01.17.
 */
public class JsonTools {

    private static final ObjectMapper JSON = new ObjectMapper();

    public static ObjectNode newNode() {
        return JSON.createObjectNode();
    }

    public static byte[] toBytes(ObjectNode node) {
        return toString(node).getBytes(StandardCharsets.UTF_8);
    }

    public static JsonNode fromString(String data) {
        try {
            return JSON.readTree(data);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static String toString(JsonNode node) {
        try {
            return JSON.writeValueAsString(node);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

    public static void putToNode(ObjectNode node, KvEntry kv) {
        switch (kv.getDataType()) {
            case BOOLEAN:
                node.put(kv.getKey(), kv.getBooleanValue().get());
                break;
            case STRING:
                node.put(kv.getKey(), kv.getStrValue().get());
                break;
            case LONG:
                node.put(kv.getKey(), kv.getLongValue().get());
                break;
            case DOUBLE:
                node.put(kv.getKey(), kv.getDoubleValue().get());
                break;
        }
    }

    public static List<KvEntry> getKvEntries(JsonNode data) {
        List<KvEntry> attributes = new ArrayList<>();
        for (Iterator<Map.Entry<String, JsonNode>> it = data.fields(); it.hasNext(); ) {
            Map.Entry<String, JsonNode> field = it.next();
            String key = field.getKey();
            JsonNode value = field.getValue();
            if (value.isBoolean()) {
                attributes.add(new BooleanDataEntry(key, value.asBoolean()));
            } else if (value.isLong()) {
                attributes.add(new LongDataEntry(key, value.asLong()));
            } else if (value.isDouble()) {
                attributes.add(new DoubleDataEntry(key, value.asDouble()));
            } else {
                attributes.add(new StringDataEntry(key, value.asText()));
            }
        }
        return attributes;
    }
}