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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.unmarshallers;

import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import com.amazonaws.services.dynamodbv2.datamodeling.ArgumentUnmarshaller;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMappingException;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;

/**
 * A special unmarshaller for Set<Boolean>, which the V1 schema stores as
 * an NS using 0/1 for true/false. In the V2 schema these fall through to
 * the {@code ObjectSetToListMarshaller} which stores them as an L or BOOLs.
 */
public class BooleanSetUnmarshaller implements ArgumentUnmarshaller {

    private static final BooleanSetUnmarshaller INSTANCE =
            new BooleanSetUnmarshaller();

    public static BooleanSetUnmarshaller instance() {
        return INSTANCE;
    }

    private BooleanSetUnmarshaller() {
    }

    @Override
    public void typeCheck(AttributeValue value, Method setter) {
        if (value.getNS() == null && value.getL() == null) {
            throw new DynamoDBMappingException(
                    "Expected either L or NS in value " + value
                    + " when invoking " + setter);
        }
    }

    @Override
    public Object unmarshall(AttributeValue value) {
        if (value.getL() != null) {
            return unmarshallList(value.getL());
        } else {
            return unmarshallNS(value.getNS());
        }
    }

    private Set unmarshallList(List values) {
        Set result = new HashSet();

        for (AttributeValue value : values) {
            Boolean bool;
            if (Boolean.TRUE.equals(value.isNULL())) {
                bool = null;
            } else {
                bool = value.getBOOL();
                if (bool == null) {
                    throw new DynamoDBMappingException(
                            value + " is not a boolean");
                }
            }

            if (!result.add(bool)) {
                throw new DynamoDBMappingException(
                        "Duplicate value (" + bool + ") found in "
                        + values);
            }
        }

        return result;
    }

    private Set unmarshallNS(List values) {
        Set result = new HashSet();

        for (String s : values) {
            if ("1".equals(s)) {
                result.add(Boolean.TRUE);
            } else if ("0".equals(s)) {
                result.add(Boolean.FALSE);
            } else {
                throw new IllegalArgumentException(
                        "Expected '1' or '0' for boolean value, was " + s);
            }
        }

        return result;
    }
}