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    • io.servicecomb.codec.protobuf.jackson.AbstractDeserializer Maven / Gradle / Ivy

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    /*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * 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 io.servicecomb.codec.protobuf.jackson;

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

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import io.servicecomb.codec.protobuf.codec.AbstractFieldCodec.ReaderHelpData;

public abstract class AbstractDeserializer extends JsonDeserializer {
    protected Map readerHelpDataMap;

    public AbstractDeserializer(Map readerHelpDataMap) {
        this.readerHelpDataMap = readerHelpDataMap;
    }

    @Override
    public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        Object result = createResult();
        for (String fieldName = p.nextFieldName(); fieldName != null; fieldName = p.nextFieldName()) {
            // p实际是ProtobufParser，其内部是可以直接取到proto field的，理论上可以根据id来索引
            // 可是field默认没暴露出来，所以，直接用name索引了
            ReaderHelpData helpData = readerHelpDataMap.get(fieldName);
            if (helpData == null) {
                continue;
            }

            JsonToken t = p.nextToken();
            // Note: must handle null explicitly here; value deserializers won't
            Object value = null;
            if (t == JsonToken.VALUE_NULL) {
                value = helpData.getDeser().getNullValue(ctxt);
            } else {
                value = helpData.getDeser().deserialize(p, ctxt);
            }

            result = updateResult(result, value, helpData);
        }

        return result;
    }

    protected abstract Object createResult();

    protected abstract Object updateResult(Object result, Object value, ReaderHelpData helpData);
}
    
    
    
    

    




    
    
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