File content as of revision 45:2aa9f933c8d2:

/*
 * Copyright (c) 2017 Baidu, Inc. 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.
 */
package com.baidu.duer.dcs.framework.message;

import com.baidu.duer.dcs.util.ObjectMapperUtil;

import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.annotate.JsonIgnore;
import org.codehaus.jackson.map.DeserializationContext;
import org.codehaus.jackson.map.JsonDeserializer;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectReader;
import org.codehaus.jackson.map.annotate.JsonDeserialize;
import org.codehaus.jackson.node.ObjectNode;

import java.io.IOException;
import java.util.Iterator;
import java.util.Map;

/**
 * 指令类：服务端下发给设备端去执行
 * <p>
 * Created by wuruisheng on 2017/5/31.
 */
@JsonDeserialize(using = Directive.DirectiveDeserializer.class)
public class Directive {
    public Header header;
    public Payload payload;

    @JsonIgnore
    public String rawMessage;


    public Directive(Header header, JsonNode payload, String rawMessage) throws IOException {
        this.header = header;
        String namespace = header.getNamespace();
        String name = header.getName();
        Class<?> payloadType = PayloadConfig.getInstance().findPayloadClass(namespace, name);
        if (null != payloadType) {
            this.payload = ObjectMapperUtil.instance().getObjectReader().withType(payloadType).readValue(payload);
        } else {
            this.payload = new Payload();
        }

        this.rawMessage = rawMessage;
    }

    /**
     * jackson反序列化directive对象
     */
    public static class DirectiveDeserializer extends JsonDeserializer<Directive> {
        @Override
        public Directive deserialize(JsonParser jp, DeserializationContext ctx)
                throws IOException {
            ObjectReader reader = ObjectMapperUtil.instance().getObjectReader();
            ObjectNode obj = (ObjectNode) reader.readTree(jp);
            Iterator<Map.Entry<String, JsonNode>> elementsIterator = obj.getFields();

            String rawMessage = obj.toString();
            DialogRequestIdHeader header = null;
            JsonNode payloadNode = null;
            ObjectReader headerReader =
                    ObjectMapperUtil.instance().getObjectReader(DialogRequestIdHeader.class);
            while (elementsIterator.hasNext()) {
                Map.Entry<String, JsonNode> element = elementsIterator.next();
                if (element.getKey().equals("header")) {
                    header = headerReader.readValue(element.getValue());
                }
                if (element.getKey().equals("payload")) {
                    payloadNode = element.getValue();
                }
            }
            if (header == null) {
                throw ctx.mappingException("Missing header");
            }
            if (payloadNode == null) {
                throw ctx.mappingException("Missing payload");
            }

            return createDirective(header, payloadNode, rawMessage);
        }

        private Directive createDirective(Header header, JsonNode payload, String rawMessage)
                throws JsonParseException, JsonMappingException, IOException {
            return new Directive(header, payload, rawMessage);
        }
    }

    @JsonIgnore
    public String getName() {
        return header.getName();
    }

    public Payload getPayload() {
        return payload;
    }
}