/*
* Created on 27-Apr-2004
* Created by Paul Gardner
* Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* 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 (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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package org.gudy.azureus2.pluginsimpl.local.ui.components;
/**
* @author parg
*
*/
import java.io.File;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.LinkedList;
import org.gudy.azureus2.core3.util.*;
import org.gudy.azureus2.plugins.ui.components.UIPropertyChangeListener;
import org.gudy.azureus2.plugins.ui.components.UITextArea;
public class
UITextAreaImpl
extends UIComponentImpl
implements UITextArea
{
private final boolean enable_history = System.getProperty( "az.logging.keep.ui.history", "true" ).equals( "true" );
private int max_size = DEFAULT_MAX_SIZE;
private int max_file_size = 20 * max_size;
PoopWriter pw;
int current_file_size;
File poop_file;
boolean useFile = true;
AEMonitor file_mon = new AEMonitor("filemon");
LinkedList<String> delay_text = new LinkedList<String>();
int delay_size = 0;
FrequencyLimitedDispatcher dispatcher =
new FrequencyLimitedDispatcher(
new AERunnable()
{
public void
runSupport()
{
delayAppend();
}
},
500 );
public
UITextAreaImpl()
{
setText("");
}
public void
setText(
String text )
{
if ( !enable_history ){
return;
}
if ( useFile ){
try{
file_mon.enter();
if ( pw == null ){
pw = new PoopWriter();
pw.print(text);
current_file_size = text.length();
return;
}
}finally{
file_mon.exit();
}
}
// has property change listener, or error while doing file (fallthrough)
if ( text.length() > max_size ){
int size_to_show = max_size - 10000;
if ( size_to_show < 0 ){
size_to_show = max_size;
}
text = text.substring( text.length() - size_to_show );
}
setProperty( PT_VALUE, text );
}
public void
appendText(
String text )
{
if ( !enable_history ){
return;
}
if ( useFile && pw != null ){
try{
file_mon.enter();
// shrink the file occasionally
if ( current_file_size > max_file_size ){
current_file_size = getFileText().length();
}
pw.print(text);
current_file_size += text.length();
return;
}finally{
file_mon.exit();
}
}
synchronized( this ){
delay_text.addLast( text );
delay_size += text.length();
while( delay_size > max_size ){
if ( delay_text.size() == 0 ){
break;
}
String s = (String)delay_text.removeFirst();
delay_size -= s.length();
}
}
dispatcher.dispatch();
}
protected void
delayAppend()
{
String str = getText();
String text;
synchronized( this ){
if ( delay_text.size() == 1 ){
text = (String)delay_text.get(0);
}else{
StringBuffer sb = new StringBuffer( delay_size );
Iterator<String> it = delay_text.iterator();
while( it.hasNext()){
sb.append( it.next());
}
text = sb.toString();
}
delay_text.clear();
delay_size = 0;
}
if ( str == null ){
setText( text );
}else{
setText( str + text );
}
}
public String
getText()
{
if ( !enable_history ){
return( "" );
}
if ( useFile && pw != null ){
return( getFileText());
}
return((String)getProperty( PT_VALUE ));
}
public void
setMaximumSize(
int _max_size )
{
max_size = _max_size;
}
private String
getFileText()
{
try{
file_mon.enter();
String text = null;
if ( pw != null ){
pw.close();
text = pw.getText();
}
if ( text == null ){
text = "";
}
pw = null;
if ( useFile ){
pw = new PoopWriter();
pw.print(text);
current_file_size = text.length();
}
return text;
}finally{
file_mon.exit();
}
}
public void
addPropertyChangeListener(
UIPropertyChangeListener l )
{
if ( useFile ){
useFile = false;
setText( getFileText());
}
super.addPropertyChangeListener(l);
}
protected class
PoopWriter
{
private StringBuffer buffer = new StringBuffer(256);
private PrintWriter pw;
private void
print(
String text )
{
if ( pw == null ){
buffer.append( text );
if ( buffer.length() > 8*1024 ){
if ( poop_file == null ){
try{
poop_file = AETemporaryFileHandler.createTempFile();
}catch( Throwable e ){
}
}
if ( poop_file != null ){
try{
pw = new PrintWriter( poop_file );
pw.print( buffer.toString());
}catch( Throwable e ){
}
}
buffer.setLength( 0 );
}
}else{
pw.print( text );
}
}
private String
getText()
{
if ( poop_file == null ){
return( buffer.toString());
}else{
try{
return( FileUtil.readFileEndAsString( poop_file, max_size ));
}catch( Throwable e ){
return( "" );
}
}
}
private void
close()
{
if ( pw != null ){
pw.close();
pw = null;
}
}
}
}