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package yarfraw.utils.reader; |
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import java.io.File; |
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import java.io.IOException; |
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.concurrent.Callable; |
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import java.util.concurrent.ExecutionException; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.Future; |
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import org.apache.commons.httpclient.HttpURL; |
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import org.apache.commons.lang.ArrayUtils; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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import yarfraw.core.datamodel.ChannelFeed; |
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import yarfraw.core.datamodel.FeedFormat; |
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import yarfraw.core.datamodel.YarfrawException; |
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import yarfraw.io.FeedReader; |
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public class FeedReaderUtils{ |
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private FeedReaderUtils(){} |
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private static final Log LOG = LogFactory.getLog(FeedReaderUtils.class); |
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private static class FeedReaderCaller implements Callable<ChannelFeed>{ |
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private HttpURL _url; |
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public FeedReaderCaller(HttpURL url){ |
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_url = url; |
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} |
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public ChannelFeed call() throws YarfrawException, IOException { |
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return new FeedReader(_url).readChannel(); |
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} |
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} |
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public static List<ChannelFeed> readAll(ExecutorService executorService, HttpURL... urls) |
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throws YarfrawException{ |
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List<ChannelFeed> ret = new ArrayList<ChannelFeed>(); |
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List<Future<ChannelFeed>> futures = new ArrayList<Future<ChannelFeed>>(); |
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if(!ArrayUtils.isEmpty(urls)){ |
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for(final HttpURL url : urls){ |
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futures.add(executorService.submit(new FeedReaderCaller(url))); |
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} |
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} |
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for(Future<ChannelFeed> f : futures){ |
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try { |
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ret.add(f.get()); |
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} |
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catch (InterruptedException e) { |
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LOG.error("Interrupted exception received", e); |
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ret.add(null); |
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} |
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catch (ExecutionException e) { |
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LOG.error("Execution exception received", e); |
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ret.add(null); |
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} |
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} |
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return ret; |
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} |
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public static List<ChannelFeed> readAll(FeedFormat format, File... files) throws YarfrawException{ |
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List<ChannelFeed> ret = new ArrayList<ChannelFeed>(); |
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if(!ArrayUtils.isEmpty(files)){ |
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for(File f : files){ |
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FeedReader reader = new FeedReader(f, format); |
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ret.add(reader.readChannel()); |
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} |
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} |
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return ret; |
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} |
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public static ChannelFeed read(FeedFormat format, File file) throws YarfrawException{ |
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List<ChannelFeed> ret = readAll(format, file); |
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return ret.size() == 0 ? null : ret.get(0); |
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} |
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} |