com.amazonaws.services.dynamodbv2.model.transform.ScanRequestMarshaller Maven / Gradle / Ivy

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The AWS Java SDK for Amazon DynamoDB module holds the client classes that are used for communicating with Amazon DynamoDB Service
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/*
 * Copyright 2010-2016 Amazon.com, Inc. or its affiliates. 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.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.amazonaws.services.dynamodbv2.model.transform;

import java.io.ByteArrayInputStream;
import java.util.Collections;
import java.util.Map;
import java.util.List;
import java.util.regex.Pattern;

import com.amazonaws.AmazonClientException;
import com.amazonaws.Request;
import com.amazonaws.DefaultRequest;
import com.amazonaws.http.HttpMethodName;
import com.amazonaws.services.dynamodbv2.model.*;
import com.amazonaws.transform.Marshaller;
import com.amazonaws.util.BinaryUtils;
import com.amazonaws.util.StringUtils;
import com.amazonaws.util.IdempotentUtils;
import com.amazonaws.util.StringInputStream;
import com.amazonaws.protocol.json.*;

/**
 * ScanRequest Marshaller
 */
public class ScanRequestMarshaller implements
        Marshaller, ScanRequest> {

    private final SdkJsonProtocolFactory protocolFactory;

    public ScanRequestMarshaller(SdkJsonProtocolFactory protocolFactory) {
        this.protocolFactory = protocolFactory;
    }

    public Request marshall(ScanRequest scanRequest) {

        if (scanRequest == null) {
            throw new AmazonClientException(
                    "Invalid argument passed to marshall(...)");
        }

        Request request = new DefaultRequest(
                scanRequest, "AmazonDynamoDBv2");
        request.addHeader("X-Amz-Target", "DynamoDB_20120810.Scan");

        request.setHttpMethod(HttpMethodName.POST);

        request.setResourcePath("");

        try {
            final StructuredJsonGenerator jsonGenerator = protocolFactory
                    .createGenerator();

            jsonGenerator.writeStartObject();

            if (scanRequest.getTableName() != null) {
                jsonGenerator.writeFieldName("TableName").writeValue(
                        scanRequest.getTableName());
            }
            if (scanRequest.getIndexName() != null) {
                jsonGenerator.writeFieldName("IndexName").writeValue(
                        scanRequest.getIndexName());
            }

            java.util.List attributesToGetList = scanRequest
                    .getAttributesToGet();
            if (attributesToGetList != null) {
                jsonGenerator.writeFieldName("AttributesToGet");
                jsonGenerator.writeStartArray();
                for (String attributesToGetListValue : attributesToGetList) {
                    if (attributesToGetListValue != null) {
                        jsonGenerator.writeValue(attributesToGetListValue);
                    }
                }
                jsonGenerator.writeEndArray();
            }
            if (scanRequest.getLimit() != null) {
                jsonGenerator.writeFieldName("Limit").writeValue(
                        scanRequest.getLimit());
            }
            if (scanRequest.getSelect() != null) {
                jsonGenerator.writeFieldName("Select").writeValue(
                        scanRequest.getSelect());
            }

            java.util.Map scanFilterMap = scanRequest
                    .getScanFilter();
            if (scanFilterMap != null) {
                jsonGenerator.writeFieldName("ScanFilter");
                jsonGenerator.writeStartObject();

                for (Map.Entry scanFilterMapValue : scanFilterMap
                        .entrySet()) {
                    if (scanFilterMapValue.getValue() != null) {
                        jsonGenerator.writeFieldName(scanFilterMapValue
                                .getKey());

                        ConditionJsonMarshaller.getInstance().marshall(
                                scanFilterMapValue.getValue(), jsonGenerator);
                    }
                }
                jsonGenerator.writeEndObject();
            }
            if (scanRequest.getConditionalOperator() != null) {
                jsonGenerator.writeFieldName("ConditionalOperator").writeValue(
                        scanRequest.getConditionalOperator());
            }

            java.util.Map exclusiveStartKeyMap = scanRequest
                    .getExclusiveStartKey();
            if (exclusiveStartKeyMap != null) {
                jsonGenerator.writeFieldName("ExclusiveStartKey");
                jsonGenerator.writeStartObject();

                for (Map.Entry exclusiveStartKeyMapValue : exclusiveStartKeyMap
                        .entrySet()) {
                    if (exclusiveStartKeyMapValue.getValue() != null) {
                        jsonGenerator.writeFieldName(exclusiveStartKeyMapValue
                                .getKey());

                        AttributeValueJsonMarshaller.getInstance().marshall(
                                exclusiveStartKeyMapValue.getValue(),
                                jsonGenerator);
                    }
                }
                jsonGenerator.writeEndObject();
            }
            if (scanRequest.getReturnConsumedCapacity() != null) {
                jsonGenerator.writeFieldName("ReturnConsumedCapacity")
                        .writeValue(scanRequest.getReturnConsumedCapacity());
            }
            if (scanRequest.getTotalSegments() != null) {
                jsonGenerator.writeFieldName("TotalSegments").writeValue(
                        scanRequest.getTotalSegments());
            }
            if (scanRequest.getSegment() != null) {
                jsonGenerator.writeFieldName("Segment").writeValue(
                        scanRequest.getSegment());
            }
            if (scanRequest.getProjectionExpression() != null) {
                jsonGenerator.writeFieldName("ProjectionExpression")
                        .writeValue(scanRequest.getProjectionExpression());
            }
            if (scanRequest.getFilterExpression() != null) {
                jsonGenerator.writeFieldName("FilterExpression").writeValue(
                        scanRequest.getFilterExpression());
            }

            java.util.Map expressionAttributeNamesMap = scanRequest
                    .getExpressionAttributeNames();
            if (expressionAttributeNamesMap != null) {
                jsonGenerator.writeFieldName("ExpressionAttributeNames");
                jsonGenerator.writeStartObject();

                for (Map.Entry expressionAttributeNamesMapValue : expressionAttributeNamesMap
                        .entrySet()) {
                    if (expressionAttributeNamesMapValue.getValue() != null) {
                        jsonGenerator
                                .writeFieldName(expressionAttributeNamesMapValue
                                        .getKey());

                        jsonGenerator
                                .writeValue(expressionAttributeNamesMapValue
                                        .getValue());
                    }
                }
                jsonGenerator.writeEndObject();
            }

            java.util.Map expressionAttributeValuesMap = scanRequest
                    .getExpressionAttributeValues();
            if (expressionAttributeValuesMap != null) {
                jsonGenerator.writeFieldName("ExpressionAttributeValues");
                jsonGenerator.writeStartObject();

                for (Map.Entry expressionAttributeValuesMapValue : expressionAttributeValuesMap
                        .entrySet()) {
                    if (expressionAttributeValuesMapValue.getValue() != null) {
                        jsonGenerator
                                .writeFieldName(expressionAttributeValuesMapValue
                                        .getKey());

                        AttributeValueJsonMarshaller.getInstance().marshall(
                                expressionAttributeValuesMapValue.getValue(),
                                jsonGenerator);
                    }
                }
                jsonGenerator.writeEndObject();
            }
            if (scanRequest.getConsistentRead() != null) {
                jsonGenerator.writeFieldName("ConsistentRead").writeValue(
                        scanRequest.getConsistentRead());
            }

            jsonGenerator.writeEndObject();

            byte[] content = jsonGenerator.getBytes();
            request.setContent(new ByteArrayInputStream(content));
            request.addHeader("Content-Length",
                    Integer.toString(content.length));
            request.addHeader("Content-Type", jsonGenerator.getContentType());
        } catch (Throwable t) {
            throw new AmazonClientException(
                    "Unable to marshall request to JSON: " + t.getMessage(), t);
        }

        return request;
    }

}