@Override
    public ItemCollection<ScanOutcome> scan(String filterExpression,
            Map<String, String> nameMap, Map<String, Object> valueMap) {
        return doScan(new ScanSpec()
                .withFilterExpression(filterExpression)
                .withNameMap(nameMap)
                .withValueMap(valueMap));
    }
The implementation for <code>ScanApi</code>.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/document/internal/ScanImpl.java