ProxyPage.java :  » Wiki-Engine » fitnesse » fitnesse » wiki » Java Open Source

// Copyright (C) 2003,2004,2005 by Object Mentor, Inc. All rights reserved.
// Released under the terms of the GNU General Public License version 2 or later.
package fitnesse.wiki;

import fitnesse.http.*;
import java.util.*;
import java.net.*;
import java.io.*;

public class ProxyPage extends CachingPage implements Serializable
{
  public static int retrievalCount = 0;

  private String host;
  private int hostPort;
  private WikiPagePath realPath;
  public ResponseParser parser;
  private long lastLoadChildrenTime = 0;

  public ProxyPage(WikiPage original) throws Exception
  {
    super(original.getName(), null);
    realPath = original.getPageCrawler().getFullPath(original);

    List children = original.getChildren();
    for(Iterator iterator = children.iterator(); iterator.hasNext();)
    {
      ProxyPage child = new ProxyPage((WikiPage) iterator.next());
      child.parent = this;
      this.children.put(child.getName(), child);
    }
  }

  protected ProxyPage(String name, WikiPage parent) throws Exception
  {
    super(name, parent);
  }

  public ProxyPage(String name, WikiPage parent, String host, int port, WikiPagePath path) throws Exception
  {
    super(name, parent);
    this.host = host;
    hostPort = port;
    realPath = path;
  }

  public static ProxyPage retrievePage(String urlString) throws Exception
  {
    retrievalCount++;
    URL url = new URL(urlString + "?responder=proxy&type=bones");
    ProxyPage page = (ProxyPage) getObjectFromUrl(url);
    page.setTransientValues(url.getHost(), new Date().getTime());
    int port = url.getPort();
    page.setHostPort((port == -1) ? 80 : port);
    page.lastLoadChildrenTime = System.currentTimeMillis();
    return page;
  }

  protected WikiPage createChildPage(String name) throws Exception
  {
    WikiPagePath childPath = realPath.copy().addName(name);
    return new ProxyPage(name, this, host, getHostPort(), childPath);
  }

  protected void loadChildren() throws Exception
  {
    if(cacheTime <= (System.currentTimeMillis() - lastLoadChildrenTime))
    {
      ProxyPage page = retrievePage(getThisPageUrl());
      children.clear();
      for(Iterator iterator = page.children.values().iterator(); iterator.hasNext();)
      {
        ProxyPage child = (ProxyPage) iterator.next();
        child.parent = this;
        children.put(child.getName(), child);
      }
      lastLoadChildrenTime = System.currentTimeMillis();
    }
  }

  public String getThisPageUrl()
  {
    StringBuffer url = new StringBuffer("http://");
    url.append(host);
    url.append(":").append(getHostPort());
    url.append("/").append(PathParser.render(realPath));
    return url.toString();
  }

  public boolean hasChildPage(String pageName) throws Exception
  {
    if(children.containsKey(pageName))
      return true;
    else
    {
      loadChildren();
      return children.containsKey(pageName);
    }
  }

  public void setTransientValues(String host, long lastLoadTime)
  {
    this.host = host;
    lastLoadChildrenTime = lastLoadTime;
    for(Iterator i = children.values().iterator(); i.hasNext();)
    {
      ProxyPage page = (ProxyPage) i.next();
      page.setTransientValues(host, lastLoadTime);
    }
  }

  public String getHost()
  {
    return host;
  }

  public void setHostPort(int port)
  {
    hostPort = port;
    for(Iterator i = children.values().iterator(); i.hasNext();)
    {
      ProxyPage page = (ProxyPage) i.next();
      page.setHostPort(port);
    }
  }

  public int getHostPort()
  {
    return hostPort;
  }

  public PageData getMeat() throws Exception
  {
    return getMeat(null);
  }

  public PageData getMeat(String versionName) throws Exception
  {
    StringBuffer urlString = new StringBuffer(getThisPageUrl());
    urlString.append("?responder=proxy&type=meat");
    if(versionName != null)
      urlString.append("&version=").append(versionName);
    URL url = new URL(urlString.toString());
    PageData data = (PageData) getObjectFromUrl(url);
    if(data != null)
      data.setWikiPage(this);
    return data;
  }

  private static Object getObjectFromUrl(URL url) throws Exception
  {
    Object obj;
    InputStream is = url.openStream();
    ObjectInputStream ois = new ObjectInputStream(is);
    obj = ois.readObject();
    ois.close();
    return obj;
  }

  protected PageData makePageData() throws Exception
  {
    return getMeat();
  }

  public PageData getDataVersion(String versionName) throws Exception
  {
    PageData data = getMeat(versionName);
    if(data == null)
      throw new NoSuchVersionException("There is no version '" + versionName + "'");
    return data;
  }

  //TODO-MdM these are not needed
  // We expect this to go away when we do the checkout model
  protected VersionInfo makeVersion() throws Exception
  {
    return null;
  }

  protected void doCommit(PageData data) throws Exception
  {
  }
}