software.amazon.awssdk.enhanced.dynamodb.internal.converter.attribute.CharSequenceAttributeConverter Maven / Gradle / Ivy

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/*
 * Copyright 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 software.amazon.awssdk.enhanced.dynamodb.internal.converter.attribute;

import software.amazon.awssdk.annotations.Immutable;
import software.amazon.awssdk.annotations.SdkInternalApi;
import software.amazon.awssdk.annotations.ThreadSafe;
import software.amazon.awssdk.enhanced.dynamodb.AttributeConverter;
import software.amazon.awssdk.enhanced.dynamodb.AttributeValueType;
import software.amazon.awssdk.enhanced.dynamodb.EnhancedType;
import software.amazon.awssdk.enhanced.dynamodb.internal.converter.string.CharSequenceStringConverter;
import software.amazon.awssdk.services.dynamodb.model.AttributeValue;

/**
 * A converter between {@link CharSequence} and {@link AttributeValue}.
 *
 * 
 * This stores values in DynamoDB as a string.
 *
 * 

 * This supports reading every string value supported by DynamoDB, making it fully compatible with custom converters as
 * well as internal converters (e.g. {@link StringAttributeConverter}).
 *
 * 
 * This can be created via {@link #create()}.
 */
@SdkInternalApi
@ThreadSafe
@Immutable
public final class CharSequenceAttributeConverter implements AttributeConverter {
    private static final CharSequenceStringConverter CHAR_SEQUENCE_STRING_CONVERTER = CharSequenceStringConverter.create();
    private static final StringAttributeConverter STRING_ATTRIBUTE_CONVERTER = StringAttributeConverter.create();

    private CharSequenceAttributeConverter() {
    }

    public static CharSequenceAttributeConverter create() {
        return new CharSequenceAttributeConverter();
    }

    @Override
    public EnhancedType type() {
        return EnhancedType.of(CharSequence.class);
    }

    @Override
    public AttributeValueType attributeValueType() {
        return AttributeValueType.S;
    }

    @Override
    public AttributeValue transformFrom(CharSequence input) {
        return AttributeValue.builder().s(CHAR_SEQUENCE_STRING_CONVERTER.toString(input)).build();
    }

    @Override
    public CharSequence transformTo(AttributeValue input) {
        String string = STRING_ATTRIBUTE_CONVERTER.transformTo(input);
        return CHAR_SEQUENCE_STRING_CONVERTER.fromString(string);
    }
}