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  * Copyright 2014-2015 Amazon Technologies, Inc.
  * 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:
 * 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.
A legacy marshaller that marshals sets of Java Booleans into DynamoDB NumberSets, representing true as '1' and false as '0'. Retained for backwards compatibility with older versions of the mapper which don't know about the DynamoDB BOOL type.
        implements NumberSetAttributeMarshaller {
    private static final BooleanSetToNumberSetMarshaller INSTANCE =
            new BooleanSetToNumberSetMarshaller();
    public static BooleanSetToNumberSetMarshaller instance() {
        return ;
    private BooleanSetToNumberSetMarshaller() {
    public AttributeValue marshall(Object obj) {
        Set<Booleanbooleans = (Set<Boolean>) obj;
        List<StringbooleanAttributes = new ArrayList<String>(booleans.size());
        for (Boolean b : booleans) {
            if (b == null || b == false) {
            } else {
        return new AttributeValue().withNS(booleanAttributes);
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