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package com.amazonaws.codesamples;

import java.util.HashMap;

import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.GetItemRequest;
import com.amazonaws.services.dynamodbv2.model.GetItemResult;

public class MusicLowLevelDemo {

    public static void main(String[] args) {

        AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build();

        HashMap<String, AttributeValue> key = new HashMap<String, AttributeValue>();
        key.put("Artist", new AttributeValue().withS("No One You Know"));
        key.put("SongTitle", new AttributeValue().withS("Call Me Today"));

        GetItemRequest request = new GetItemRequest()
            .withTableName("Music")
            .withKey(key);

        try {
            GetItemResult result = client.getItem(request);
            if (result && result.getItem() != null) {
                AttributeValue year = result.getItem().get("Year");
                System.out.println("The song was released in " + year.getN());
            } else {
                System.out.println("No matching song was found");
            }
        } catch (Exception e) {
            System.err.println("Unable to retrieve data: ");
            System.err.println(e.getMessage());
        }
    }
}