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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;

import java.util.HashMap;
import java.util.Map;

/**
 * A strategy for mapping between Java types and DynamoDB types. Serves as a
 * factory for {@code ItemConverter} instances that implement this mapping.
 * Standard implementations are available in the {@link ConversionSchemas}
 * class.
 */
public interface ConversionSchema {

    /**
     * Dependency injection for the {@code ItemConverter}s that this
     * {@code ConversionSchema} generates.
     */
    static class Dependencies {

        private final Map, Object> values;

        public Dependencies() {
            values = new HashMap, Object>();
        }

        @SuppressWarnings("unchecked")
        public  T get(Class clazz) {
            return (T) values.get(clazz);
        }

        public  Dependencies with(Class clazz, T value) {
            values.put(clazz, value);
            return this;
        }

        @Override
        public String toString() {
            return values.toString();
        }
    }

    /**
     * Creates an {@code ItemConverter}, injecting dependencies from the
     * {@code DynamoDBMapper} that needs it.
     *
     * @param dependencies the dependencies to inject
     * @return a new ItemConverter
     */
    ItemConverter getConverter(Dependencies dependencies);
}