eu.bitwalker.useragentutils.version.fetcher.SequentialVersionFetcher Maven / Gradle / Ivy

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Utility classes to handle user-agents.

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package eu.bitwalker.useragentutils.version.fetcher;

import eu.bitwalker.useragentutils.Version;

/**
 * Implementation of {@link VersionFetcher} that holds a list of other {@link VersionFetcher}
 * and calls them sequentially until any of them manages to find version.
 *
 * @author alexr
 */
public class SequentialVersionFetcher implements VersionFetcher {
    private final VersionFetcher[] fetchers;

    public SequentialVersionFetcher(VersionFetcher first, VersionFetcher... others) {
        fetchers = new VersionFetcher[others.length + 1];
        fetchers[0] = first;
        System.arraycopy(others, 0, fetchers, 1, others.length);
    }

    @Override
    public Version version(String str) {
        for (VersionFetcher fetcher : fetchers) {
            Version version = fetcher.version(str);
            if (version != null) return version;
        }
        return null;
    }

}