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package provider;
import com.google.gson.JsonObject;
import java.io.Closeable;
import java.io.Flushable;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.commons.io.IOUtils;
/**
* ResultListener that can contain multiple registrations.
*
* @author Peter Wu
*/
public class CompositeResultListener implements ResultListener, Closeable,
Flushable {
private final List<ResultListener> listeners;
public CompositeResultListener() {
this.listeners = new ArrayList<>();
}
public void register(ResultListener rl) {
listeners.add(rl);
}
public void unregister(ResultListener rl) {
listeners.remove(rl);
}
public List<ResultListener> getRegistered() {
return new ArrayList<>(listeners);
}
public ResultListener findListener(Class<? extends ResultListener> rlCls) {
for (ResultListener rl : listeners) {
if (rlCls == rl.getClass()) {
return rl;
}
}
return null;
}
@Override
public void tweetGenerated(JsonObject obj) {
for (ResultListener rl : listeners) {
rl.tweetGenerated(obj);
}
}
@Override
public void close() {
for (ResultListener rl : listeners) {
if (rl instanceof Closeable) {
IOUtils.closeQuietly((Closeable) rl);
}
}
}
@Override
public void flush() {
for (ResultListener rl : listeners) {
if (rl instanceof Flushable) {
try {
((Flushable) rl).flush();
} catch (IOException ex) {
Logger.getLogger(rl.getClass().getName())
.log(Level.SEVERE, "flush", ex);
}
}
}
}
}
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