BatchGetItemResponseUnmarshaller.java

/*
 * Copyright 2014 Baidu, Inc.
 *
 * 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.baidubce.services.moladb.model.transform;

import java.io.InputStream;
import java.util.List;
import java.util.Map;
import com.baidubce.model.AbstractBceResponse;
import com.baidubce.services.moladb.MolaDbConstants;
import com.baidubce.services.moladb.model.AttributeValue;
import com.baidubce.services.moladb.model.BatchGetItemResponse;
import com.baidubce.services.moladb.model.KeysAndAttributes;
import com.baidubce.util.JsonUtils;
import com.fasterxml.jackson.databind.JsonNode;

public class BatchGetItemResponseUnmarshaller implements
        Unmarshaller<BatchGetItemResponse, InputStream> {

    BatchGetItemResponse result = null;

    public BatchGetItemResponseUnmarshaller(AbstractBceResponse response) {
        result = (BatchGetItemResponse) response;
    }

    @Override
    public BatchGetItemResponse unmarshall(InputStream stream) throws Exception {
        String streamContents = Unmarshallers.readStreamContents(stream);
        if (streamContents == null || streamContents.isEmpty()) {
            return null;
        }
        BatchGetItemResponseContentUnmarshaller responseUnmarshaller = new BatchGetItemResponseContentUnmarshaller();
        BatchGetUnprocessItemsUnmarshaller unprocessUnmarshaller = new BatchGetUnprocessItemsUnmarshaller();

        JsonNode jsonObj = JsonUtils.jsonNodeOf(streamContents);

        JsonNode respObj = jsonObj.get(MolaDbConstants.JSON_RESPONSES);
        JsonNode unprocessObj = jsonObj.get(MolaDbConstants.JSON_UNPROCESSED_ITEMS);

        Map<String, KeysAndAttributes> unprocess = null;
        if (unprocessObj != null) {
            unprocess = unprocessUnmarshaller.unmarshall(unprocessObj);
        }

        Map<String, List<Map<String, AttributeValue>>> resp = null;
        if (respObj != null) {
            resp = responseUnmarshaller.unmarshall(respObj);
        }

        result.setResponses(resp);
        result.setUnprocessedItems(unprocess);
        return result;
    }
}