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package com.sun.grizzly;

/**
 * Default {@link ProcessorSelector} implementation, which uses
 * {@link Connection}'s {@link Processor} preferences.
 * The {@link DefaultProcessorSelector} first checks {@link Connection's}
 * associated {@link Processor} ({@link Connection#getProcessor()}). If returned
 * {@link Processor} is null - if delegates selection to
 * {@link Connection}'s {@link ProcessorSelector}
 * ({@link Connection#getProcessorSelector()}).
 *
 * @author Alexey Stashok
 */
public class DefaultProcessorSelector implements ProcessorSelector {

    protected Transport transport;

    public DefaultProcessorSelector(Transport transport) {
        this.transport = transport;
    }

    /**
     * {@inheritDoc}
     */
    public Processor select(IOEvent ioEvent, Connection connection) {

        Processor eventProcessor = connection.getProcessor();

        if (eventProcessor != null && eventProcessor.isInterested(ioEvent)) {
            return eventProcessor;
        }

        ProcessorSelector processorSelector =
                connection.getProcessorSelector();

        if (processorSelector != null) {
            return processorSelector.select(ioEvent, connection);
        }

        return null;
    }
}