com.amazonaws.services.dynamodbv2.datamodeling.marshallers.ObjectSetToStringSetMarshaller Maven / Gradle / Ivy

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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2014-2016 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.
 * You may obtain a copy of the License at:
 *
 *    http://aws.amazon.com/apache2.0
 *
 * 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.datamodeling.marshallers;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.amazonaws.services.dynamodbv2.datamodeling.ArgumentMarshaller.StringSetAttributeMarshaller;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;

/**
 * A legacy marshaller that marshals sets of arbitrary Java objects into
 * DynamoDB StringSets by using {@link String#valueOf(Object)}. Retained for
 * backwards compatibility in case someone is relying on this, but logs a
 * warning if ever used since we only know how to unmarshal back to Java
 * Strings.
 */
public class ObjectSetToStringSetMarshaller
        implements StringSetAttributeMarshaller {

    private static final Log LOG =
            LogFactory.getLog(ObjectSetToStringSetMarshaller.class);

    private static final ObjectSetToStringSetMarshaller INSTANCE =
            new ObjectSetToStringSetMarshaller();

    public static ObjectSetToStringSetMarshaller instance() {
        return INSTANCE;
    }

    private ObjectSetToStringSetMarshaller() {
    }

    @Override
    public AttributeValue marshall(Object obj) {
        Set set = (Set) obj;

        LOG.warn("Marshaling a set of non-String objects to a DynamoDB "
                + "StringSet. You won't be able to read these objects back "
                + "out of DynamoDB unless you REALLY know what you're doing: "
                + "it's probably a bug. If you DO know what you're doing feel"
                + "free to ignore this warning, but consider using a custom "
                + "marshaler for this instead.");

        List strings = new ArrayList(set.size());
        for (Object o : set) {
            strings.add(String.valueOf(o));
        }

        return new AttributeValue().withSS(strings);
    }
}