/android/export-contacts

/*

 * FileChooser.java

 *

 * Copyright (C) 2010 Tim Marston <tim@ed.am>

 *

 * This file is part of the Export Contacts program (hereafter referred

 * to as "this program").  For more information, see

 * http://ed.am/dev/android/export-contacts

 *

 * 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 3 of the License, or

 * (at your option) 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, see <http://www.gnu.org/licenses/>.

 */

package am.ed.exportcontacts;

import java.io.File;

import java.io.FileFilter;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import android.app.AlertDialog;

import android.app.Dialog;

import android.content.Context;

import android.content.DialogInterface;

import android.os.Environment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.ListView;

import android.widget.TextView;

public class FileChooser

{

	// pick an existing directory

	public final static int MODE_DIR = 1;

	// pick an existing file

	public final static int MODE_FILE = 2;

	private Dialog _dialog;

	// mode

	private int _mode = MODE_DIR;

	// ok was pressed

	boolean _ok = false;

	// working path

	private String _path;

	// selected filename

	private String _filename;

	// enforce extension (in file-mode)

	private String[] _extensions;

	// path to secretly prefix all paths with

	private String _path_prefix = "";

	private Context _context;

	private ArrayList< RowItem > _items;

	private DialogInterface.OnDismissListener _on_dismiss_listener;

	// class that represents a row in the list

	private class RowItem implements Comparable< RowItem >

	{

		private String _name;

		private boolean _directory;

		public RowItem( String name, boolean directory )

		{

			_name = name;

			_directory = directory;

		}

		public String getName()

		{

			return _name;

		}

		public boolean isDirectory()

		{

			return _directory;

		}

		@Override

		public int compareTo( RowItem that )

		{

			if( this._directory && !that._directory )

				return -1;

			else if( !this._directory && that._directory )

				return 1;

			else

				return this._name.compareToIgnoreCase( that._name );

		}

	}

	// class to manage our list of RowItems

	private class RowItemAdapter extends ArrayAdapter< RowItem >

	{

		private ArrayList< RowItem > _items;

		public RowItemAdapter( Context context, int textview_resource_id,

			ArrayList< RowItem > items )

		{

			super( context, textview_resource_id, items );

			_items = items;

		}

		@Override

		public View getView( int position, View convert_view, ViewGroup parent )

		{

			View view = convert_view;

			if( view == null ) {

				LayoutInflater factory = LayoutInflater.from( _context );

				view = factory.inflate(  R.layout.filechooser_row, null );

			}

			RowItem rowitem = _items.get( position );

			if( rowitem != null ) {

				( (TextView)view.findViewById( R.id.name ) )

					.setText( rowitem.getName() );

				( (ImageView)view.findViewById( R.id.icon ) ).setVisibility(

					rowitem.isDirectory()? View.VISIBLE : View.GONE );

			}

			return view;

		}

	}

	@SuppressWarnings( "serial" )

	class InvalidPathPrefixException extends RuntimeException

	{

	}

	// constructor

	public FileChooser( Context context )

	{

		_context = context;

	}

	public void setMode( int mode )

	{

		_mode = mode;

	}

	public void setPath( String path )

	{

		_path = cleanUpPath( path );

		File file = new File( _path_prefix + path.trim() );

		// path and filename

		if( file.isFile() ) {

			_path = _path.substring( 0, _path.length() - 1 );

			_filename = _path.substring( _path.lastIndexOf( '/' ) + 1 );

			_path = _path.substring( 0, _path.length() - _filename.length() );

		}

		// else, treat as just a path

		else

			_filename = "";

	}

	public void setExtensions( String[] extensions )

	{

		_extensions = extensions;

	}

	// set dismiss listener

	public void setDismissListener(

		DialogInterface.OnDismissListener on_dismiss_listener )

	{

		_on_dismiss_listener = on_dismiss_listener;

	}

	// set the path prefix

	public void setPathPrefix( String path_prefix )

	{

		// set to cleaned-up path, with trailing '/' removed so that it can be

		// trivially pre-pended to a cleaned-up path

		_path_prefix = cleanUpPath( path_prefix );

		_path_prefix = _path_prefix.substring( 0, _path_prefix.length() - 1 );

	}

	public boolean getOk()

	{

		return _ok;

	}

	public String getPath()

	{

		return _path + _filename;

	}

	public Dialog onCreateDialog()

	{

		// custom layout in an AlertDialog

		LayoutInflater factory = LayoutInflater.from( _context );

		final View dialogView = factory.inflate(

			R.layout.filechooser, null );

		// wire up buttons

		( (Button)dialogView.findViewById( R.id.ok ) )

			.setOnClickListener( _fileChooserButtonListener );

		( (ListView)dialogView.findViewById( R.id.list ) )

			.setOnItemClickListener( _fileChooserItemClickListener );

		// return dialog

		Dialog dialog = new AlertDialog.Builder( _context )

			.setTitle( " " )

			.setView( dialogView )

			.create();

		dialog.setOnDismissListener( _on_dismiss_listener );

		return dialog;

	}

	private OnClickListener _fileChooserButtonListener = new OnClickListener() {

		public void onClick( View view )

		{

			switch( view.getId() )

			{

			case R.id.ok:

				// close dialog and free (don't keep a reference)

				_ok = true;

				_dialog.dismiss();

				break;

			}

		}

	};

	private OnItemClickListener _fileChooserItemClickListener =

			new OnItemClickListener() {

		public void onItemClick( AdapterView< ? > adapter_view, View view,

			int position, long id )

		{

			RowItem rowitem = _items.get( position );

			// handle directory changes

			if( rowitem.isDirectory() )

			{

				String dirname = rowitem.getName();

				if( dirname.equals( ".." ) )

					strtipLastFilepartFromPath();

				else

					_path += dirname + "/";

				_filename = "";

				updateList();

			}

			// handle file selections

			else

			{

				_filename = rowitem.getName();

				updateCurrentSelection();

			}

		}

	};

	public void onPrepareDialog( Context context, Dialog dialog )

	{

		// set up reference to dialog

		_dialog = dialog;

		_context = context;

		// reset "ok"

		_ok = false;

		// pick text based on mode

		int title = 0, current = 0;

		switch( _mode ) {

		case MODE_DIR:

			title = R.string.filechooser_title_dir;

			current = R.string.filechooser_current_dir;

			break;

		case MODE_FILE:

			title = R.string.filechooser_title_file;

			current = R.string.filechooser_current_file;

			break;

		}

		dialog.setTitle( title );

		( (TextView)dialog.findViewById( R.id.current ) )

			.setText( _context.getString(  current ) );

		// clear filename in directory mode

		if( _mode == MODE_DIR )

			_filename = "";

		// set root path icon

		( (ImageView)_dialog.findViewById( R.id.icon ) )

			.setImageResource( pathIcon( cleanUpPath( _path_prefix ) ) );

		// setup current-path-specific stuff

		updateList();

	}

	public static String cleanUpPath( String path )

	{

		path = path.trim();

		// ensure it starts and ends in a '/'

		if( !path.startsWith( "/" ) ) path = "/" + path;

		if( !path.endsWith( "/" ) ) path += "/";

		return path;

	}

	public static int pathIcon( String path )

	{

		// get sdcard path

		String sdcard_path;

		try {

			sdcard_path = Environment.getExternalStorageDirectory()

				.getCanonicalPath();

			if( sdcard_path.charAt( sdcard_path.length() - 1 ) != '/' )

				sdcard_path += "/";

		}

		catch( IOException e ) {

			sdcard_path = null;

		}

		// special paths

		if( sdcard_path != null && path.equals( sdcard_path ) )

			return R.drawable.sdcard;

		// default

		return R.drawable.directory;

	}

	public String prettyPrint( String full_path, boolean return_full )

	{

		String path = full_path;

		// get sdcard path

		String sdcard_path;

		try {

			sdcard_path = Environment.getExternalStorageDirectory()

				.getCanonicalPath();

			if( sdcard_path.charAt( sdcard_path.length() - 1 ) != '/' )

				sdcard_path += "/";

		}

		catch( IOException e ) {

			sdcard_path = null;

		}

		// special names

		if( sdcard_path != null && path.equals( sdcard_path ) )

			return " " + _context.getString( R.string.filechooser_path_sdcard );

		// remove prefix, if present

		if( path.startsWith( _path_prefix + "/" ) )

			path = path.substring( _path_prefix.length() );

		// unless path is "/", strip trailing "/"

		if( path.length() > 1 && path.endsWith( "/" ) )

			path = path.substring( 0, path.length() - 1 );

		// if full path not required, strip off preceding directories

		if( !return_full ) {

			int idx = path.lastIndexOf( "/" );

			if( idx != -1 ) path = path.substring( idx + 1 );

		}

		return path;

	}

	protected void strtipLastFilepartFromPath()

	{

		int at = _path.lastIndexOf( '/', _path.length() - 2 );

		if( at != -1 ) _path = _path.substring( 0, at + 1 );

	}

	protected void updateList()

	{

		// reset item list

		_items = new ArrayList< RowItem >();

		// open directory (and ensure _path is a directory)

		File dir = new File( _path_prefix + _path );

		while( !dir.isDirectory() ) {

			if( _path == "/" )

				throw new InvalidPathPrefixException();

			strtipLastFilepartFromPath();

			dir = new File( _path_prefix + _path );

		}

		// add ".."?

		if( !_path.equals( "/" ) )

			_items.add( new RowItem( "..", true ) );

		// get directories

		class DirFilter implements FileFilter {

			public boolean accept( File file ) {

				return file.isDirectory() && file.getName().charAt( 0 ) != '.';

			}

		}

		File[] files = dir.listFiles( new DirFilter() );

		if( files != null )

			for( int i = 0; i < files.length; i++ )

				_items.add( new RowItem( files[ i ].getName(), true ) );

		// get files

		if( _mode == MODE_FILE )

		{

			class VCardFilter implements FileFilter {

				public boolean accept( File file ) {

					if( file.isDirectory() || file.getName().startsWith( "." ) )

						return false;

					String filename = file.getName().toLowerCase();

					for( int i = 0; i < _extensions.length; i++ )

						if( filename.endsWith( "." + _extensions[ i ] ) )

							return true;

					return false;

				}

			}

			files = dir.listFiles( new VCardFilter() );

			if( files != null )

				for( int i = 0; i < files.length; i++ )

					_items.add( new RowItem( files[ i ].getName(), false ) );

		}

		// sort

		class RowItemSorter implements Comparator< RowItem > {

			@Override

			public int compare( RowItem lhs, RowItem rhs ) {

				return lhs.compareTo( rhs );

			}

		}

		Collections.sort( _items, new RowItemSorter() );

		// setup directory list

		( (ListView)_dialog.findViewById( R.id.list ) ).setAdapter(

			new RowItemAdapter( _context, R.layout.filechooser_row,

				_items ) );

		updateCurrentSelection();

	}

	private void updateCurrentSelection()

	{

		// set current path

		( (TextView)_dialog.findViewById( R.id.path ) ).setText(

			prettyPrint( _path_prefix + _path + _filename, true ) );

		// enable/disable ok button

		if( _mode == MODE_FILE )

			_dialog.findViewById( R.id.ok ).setEnabled( _filename != "" );

		else

			_dialog.findViewById( R.id.ok ).setEnabled( true );

	}

}