com.amazonaws.services.dynamodbv2.model.transform.AttributeValueJsonUnmarshaller 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.util.Map;
import java.util.Map.Entry;
import java.math.*;
import java.nio.ByteBuffer;

import com.amazonaws.services.dynamodbv2.model.*;
import com.amazonaws.transform.SimpleTypeJsonUnmarshallers.*;
import com.amazonaws.transform.*;

import com.fasterxml.jackson.core.JsonToken;
import static com.fasterxml.jackson.core.JsonToken.*;

/**
 * AttributeValue JSON Unmarshaller
 */
public class AttributeValueJsonUnmarshaller implements
        Unmarshaller {

    public AttributeValue unmarshall(JsonUnmarshallerContext context)
            throws Exception {
        AttributeValue attributeValue = new AttributeValue();

        int originalDepth = context.getCurrentDepth();
        String currentParentElement = context.getCurrentParentElement();
        int targetDepth = originalDepth + 1;

        JsonToken token = context.getCurrentToken();
        if (token == null)
            token = context.nextToken();
        if (token == VALUE_NULL)
            return null;

        while (true) {
            if (token == null)
                break;

            if (token == FIELD_NAME || token == START_OBJECT) {
                if (context.testExpression("S", targetDepth)) {
                    context.nextToken();
                    attributeValue.setS(context.getUnmarshaller(String.class)
                            .unmarshall(context));
                }
                if (context.testExpression("N", targetDepth)) {
                    context.nextToken();
                    attributeValue.setN(context.getUnmarshaller(String.class)
                            .unmarshall(context));
                }
                if (context.testExpression("B", targetDepth)) {
                    context.nextToken();
                    attributeValue.setB(context.getUnmarshaller(
                            java.nio.ByteBuffer.class).unmarshall(context));
                }
                if (context.testExpression("SS", targetDepth)) {
                    context.nextToken();
                    attributeValue
                            .setSS(new ListUnmarshaller(context
                                    .getUnmarshaller(String.class))
                                    .unmarshall(context));
                }
                if (context.testExpression("NS", targetDepth)) {
                    context.nextToken();
                    attributeValue
                            .setNS(new ListUnmarshaller(context
                                    .getUnmarshaller(String.class))
                                    .unmarshall(context));
                }
                if (context.testExpression("BS", targetDepth)) {
                    context.nextToken();
                    attributeValue
                            .setBS(new ListUnmarshaller(
                                    context.getUnmarshaller(java.nio.ByteBuffer.class))
                                    .unmarshall(context));
                }
                if (context.testExpression("M", targetDepth)) {
                    context.nextToken();
                    attributeValue
                            .setM(new MapUnmarshaller(
                                    context.getUnmarshaller(String.class),
                                    AttributeValueJsonUnmarshaller
                                            .getInstance()).unmarshall(context));
                }
                if (context.testExpression("L", targetDepth)) {
                    context.nextToken();
                    attributeValue.setL(new ListUnmarshaller(
                            AttributeValueJsonUnmarshaller.getInstance())
                            .unmarshall(context));
                }
                if (context.testExpression("NULL", targetDepth)) {
                    context.nextToken();
                    attributeValue.setNULL(context.getUnmarshaller(
                            Boolean.class).unmarshall(context));
                }
                if (context.testExpression("BOOL", targetDepth)) {
                    context.nextToken();
                    attributeValue.setBOOL(context.getUnmarshaller(
                            Boolean.class).unmarshall(context));
                }
            } else if (token == END_ARRAY || token == END_OBJECT) {
                if (context.getLastParsedParentElement() == null
                        || context.getLastParsedParentElement().equals(
                                currentParentElement)) {
                    if (context.getCurrentDepth() <= originalDepth)
                        break;
                }
            }
            token = context.nextToken();
        }

        return attributeValue;
    }

    private static AttributeValueJsonUnmarshaller instance;

    public static AttributeValueJsonUnmarshaller getInstance() {
        if (instance == null)
            instance = new AttributeValueJsonUnmarshaller();
        return instance;
    }
}