roster.java

用java 编写的源码开放的文本编辑器。有很多有用的特性

/*
 * Roster.java - A list of things to do, used in various places
 * :tabSize=8:indentSize=8:noTabs=false:
 * :folding=explicit:collapseFolds=1:
 *
 * Copyright (C) 2001, 2002 Slava Pestov
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package org.gjt.sp.jedit.pluginmgr;

//{{{ Imports
import javax.swing.SwingUtilities;
import java.io.*;
import java.net.*;
import java.util.zip.*;
import java.util.*;
import org.gjt.sp.jedit.*;
import org.gjt.sp.util.Log;
//}}}

class Roster
{
	//{{{ Roster constructor
	Roster()
	{
		operations = new Vector();
	} //}}}

	//{{{ addOperation() method
	void addOperation(Operation op)
	{
		for(int i = 0; i < operations.size(); i++)
		{
			if(operations.elementAt(i).equals(op))
				return;
		}

		operations.addElement(op);
	} //}}}

	//{{{ getOperation() method
	public Operation getOperation(int i)
	{
		return (Operation)operations.get(i);
	} //}}}

	//{{{ getOperationCount() method
	int getOperationCount()
	{
		return operations.size();
	} //}}}

	//{{{ isEmpty() method
	boolean isEmpty()
	{
		return operations.size() == 0;
	} //}}}

	//{{{ performOperations() method
	boolean performOperations(PluginManagerProgress progress)
	{
		for(int i = 0; i < operations.size(); i++)
		{
			Operation op = (Operation)operations.elementAt(i);
			if(op.perform(progress))
				progress.done(true);
			else
			{
				progress.done(false);
				return false;
			}

			if(Thread.interrupted())
				return false;
		}

		return true;
	} //}}}

	//{{{ Private members
	private Vector operations;
	//}}}

	static interface Operation
	{
		boolean perform(PluginManagerProgress progress);
		boolean equals(Object o);
		int getMaximum();
	}

	//{{{ Remove class
	static class Remove implements Operation
	{
		Remove(String plugin)
		{
			this.plugin = plugin;
		}

		public int getMaximum()
		{
			return 1;
		}

		public boolean perform(PluginManagerProgress progress)
		{
			progress.removing(MiscUtilities.getFileName(plugin));

			// close JAR file
			EditPlugin.JAR jar = jEdit.getPluginJAR(plugin);
			if(jar != null)
				jar.getClassLoader().closeZipFile();

			// move JAR first
			File jarFile = new File(plugin);
			File srcFile = new File(plugin.substring(0,plugin.length() - 4));

			boolean ok = true;
			Log.log(Log.NOTICE,this,"Deleting " + jarFile + " recursively");

			ok &= jarFile.delete();

			if(srcFile.exists())
				ok &= deleteRecursively(srcFile);

			String[] args = { plugin };
			if(!ok)
				GUIUtilities.error(progress,"plugin-manager.remove-failed",args);
			return ok;
		}

		public boolean equals(Object o)
		{
			if(o instanceof Remove
				&& ((Remove)o).plugin.equals(plugin))
				return true;
			else
				return false;
		}

		// private members
		private String plugin;

		private boolean deleteRecursively(File file)
		{
			Log.log(Log.NOTICE,this,"Deleting " + file + " recursively");

			boolean ok = true;

			if(file.isDirectory())
			{
				String path = file.getPath();
				String[] children = file.list();
				for(int i = 0; i < children.length; i++)
				{
					ok &= deleteRecursively(new File(path,children[i]));
				}
			}

			ok &= file.delete();

			return ok;
		}
	} //}}}

	//{{{ Install class
	static class Install implements Operation
	{
		int size;

		Install(String url, String installDirectory, int size)
		{
			// catch those hooligans passing null urls
			if(url == null)
				throw new NullPointerException();

			this.url = url;
			this.installDirectory = installDirectory;
			this.size = size;
		}

		public int getMaximum()
		{
			return size;
		}

		public boolean perform(final PluginManagerProgress progress)
		{
			try
			{
				String fileName = MiscUtilities.getFileName(url);
				progress.downloading(fileName);
				String path = download(progress,fileName,url);
				if(path == null)
				{
					// interrupted download
					return false;
				}

				progress.installing(fileName);
				install(progress,path,installDirectory);

				return true;
			}
			catch(InterruptedIOException iio)
			{
				// do nothing, user clicked 'Stop'
				return false;
			}
			catch(final IOException io)
			{
				Log.log(Log.ERROR,this,io);

				SwingUtilities.invokeLater(new Runnable()
				{
					public void run()
					{
						String[] args = { io.getMessage() };
						GUIUtilities.error(null,"ioerror",args);
					}
				});

				return false;
			}
			catch(Exception e)
			{
				Log.log(Log.ERROR,this,e);

				return false;
			}
		}

		public boolean equals(Object o)
		{
			if(o instanceof Install
				&& ((Install)o).url.equals(url))
			{
				/* even if installDirectory is different */
				return true;
			}
			else
				return false;
		}

		// private members
		private String url;
		private String installDirectory;

		private String download(PluginManagerProgress progress,
			String fileName, String url) throws Exception
		{
			URLConnection conn = new URL(url).openConnection();

			String path = MiscUtilities.constructPath(getDownloadDir(),fileName);

			if(!copy(progress,conn.getInputStream(),
				new FileOutputStream(path),true,true))
				return null;

			return path;
		}

		private boolean install(PluginManagerProgress progress,
			String path, String dir) throws Exception
		{
			ZipFile zipFile = new ZipFile(path);

			try
			{
				Enumeration enum = zipFile.entries();
				while(enum.hasMoreElements())
				{
					ZipEntry entry = (ZipEntry)enum.nextElement();
					String name = entry.getName().replace('/',File.separatorChar);
					File file = new File(dir,name);
					if(entry.isDirectory())
						file.mkdirs();
					else
					{
						new File(file.getParent()).mkdirs();
						copy(progress,zipFile.getInputStream(entry),
							new FileOutputStream(file),false,false);
					}
				}
			}
			finally
			{
				zipFile.close();
				new File(path).delete();
			}

			progress.setValue(1);

			return true;
		}

		private boolean copy(PluginManagerProgress progress,
			InputStream in, OutputStream out, boolean canStop,
			boolean doProgress) throws Exception
		{
			in = new BufferedInputStream(in);
			out = new BufferedOutputStream(out);

			byte[] buf = new byte[4096];
			int copied = 0;
loop:			for(;;)
			{
				int count = in.read(buf,0,buf.length);
				if(count == -1)
					break loop;

				if(doProgress)
				{
					copied += count;
					progress.setValue(copied);
				}

				out.write(buf,0,count);
				if(canStop && Thread.interrupted())
				{
					in.close();
					out.close();
					return false;
				}
			}

			in.close();
			out.close();
			return true;
		}

		static File downloadDir;

		static String getDownloadDir()
		{
			if(downloadDir == null)
			{
				String settings = jEdit.getSettingsDirectory();
				if(settings == null)
					settings = System.getProperty("user.home");
				downloadDir = new File(MiscUtilities.constructPath(
					settings,"PluginManager.download"));
				downloadDir.mkdirs();
			}

			return downloadDir.getPath();
		}
	} //}}}
}