import com.google.common.collect.Iterables;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class S3ResourceResolver {

    private static final Pattern FILENAME_PATTERN = Pattern.compile("[^/]+\\.*$");

    private static final Function<S3ObjectSummary, String> EXTRACT_FILE_NAME = new Function<S3ObjectSummary, String>() {

        objectListing.getObjectSummaries() >> [objectSummary, objectSummary2]
        objectListing.getCommonPrefixes() >> ['root/SNAPSHOT']

        S3ResourceResolver resolver = new S3ResourceResolver()

        when:
        def results = resolver.resolveResourceNames(objectListing)

        then:
        results == ['some.jar', 'someOther.jar', 'SNAPSHOT']
    }