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 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
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package org.netbeans.installer.downloader;

import java.io.File;
import java.net.URL;
import org.netbeans.installer.utils.helper.Pair;

 * @author Danila_Dugurov

public interface Pumping {
     * It's runtime property of pumping. It means that it's not persistence 
     * property. So if downloader client maintain it's state persistance - it 
     * mustn't base on pumpings ids.
    String getId();

     * @return declared pumping url.
    URL declaredURL();

     * @return real pumping url. It is url which was obtain at runtime. It's may be 
     * the same as declared url if no redirect may occur.
    URL realURL();

     * @return file corresponding to this pumping.
    File outputFile();

    File folder();

    long length();

     * @return mode in which downloader process it. So if Single thread mode - it's
     * means that only one thread process pumping(so one section invoked). If multi
     * thread mode - it's means that downloader allowed to process pumping in more
     * then one thread concurrently. But it's not means that downloader do it.
     * The issue process or not in multy thread deal with some external issues:
     * for example domain police and server side speed reducing for client who try 
     * to obtain more then one connection at time. Base implementation in any case
     * download in one thread.
    DownloadMode mode();

    State state();

     * one section  - one thread. Section - data structure for representation and 
     * manage downloading unit
    Section[] getSections();

    // Inner Classes
    public static interface Section {
         * range of bytes this section responsible for.
        Pair<Long, Long> getRange();

         * absolute offset. Means if range: 12345 - 23456. initially offset equals 
         * 12345 when section downloaded it's equals 23456.
        long offset();

    public enum State {
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