/*
* Copyright (c) 1998-2010 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source 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.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.quercus.lib.file;
import com.caucho.quercus.QuercusModuleException;
import com.caucho.quercus.env.*;
import com.caucho.vfs.ReadStream;
import com.caucho.vfs.WriteStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Represents a Quercus file open for reading
*/
abstract public class BufferedBinaryInputOutput
extends AbstractBinaryInputOutput {
private static final Logger log = Logger.getLogger(BufferedBinaryInputOutput.class.getName());
private ReadStream _is;
private WriteStream _os;
protected BufferedBinaryInputOutput(Env env) {
super(env);
}
public void init(ReadStream is, WriteStream os) {
super.init(is, os);
_is = is;
_os = os;
}
//
// read methods
//
public void setEncoding(String encoding)
throws UnsupportedEncodingException {
if (_is != null) {
_is.setEncoding(encoding);
}
}
/**
* Unread the last byte.
*/
@Override
public void unread()
throws IOException {
if (_is != null) {
_is.unread();
_isEOF = false;
}
}
/**
* Reads a character from a file, returning -1 on EOF.
*/
@Override
public int read()
throws IOException {
try {
if (_is != null) {
int c = _is.read();
if (c < 0) {
_isEOF = true;
}
return c;
} else {
return -1;
}
} catch (IOException e) {
_isTimeout = true;
_isEOF = true;
log.log(Level.FINER, e.toString(), e);
return -1;
}
}
/**
* Reads a buffer from a file, returning -1 on EOF.
*/
public int read(char[] buffer, int offset, int length)
throws IOException {
try {
if (_is != null) {
int c = _is.read(buffer, offset, length);
if (c == -1) {
_isEOF = true;
} else {
_isEOF = false;
}
return c;
} else {
return -1;
}
} catch (IOException e) {
_isTimeout = true;
_isEOF = true;
log.log(Level.FINER, e.toString(), e);
return -1;
}
}
public void writeToStream(OutputStream os, int length)
throws IOException {
try {
if (_is != null) {
_is.writeToStream(os, length);
}
} catch (IOException e) {
_isTimeout = true;
_isEOF = true;
log.log(Level.FINER, e.toString(), e);
}
}
/**
* Reads a line from a file, returning null on EOF.
*/
@Override
public StringValue readLine(long length)
throws IOException {
try {
StringValue line = _lineReader.readLine(_env, this, length);
return line;
} catch (IOException e) {
_isTimeout = true;
_isEOF = true;
log.log(Level.FINER, e.toString(), e);
return _env.getEmptyString();
}
}
/**
* Returns the current location in the file.
*/
@Override
public long getPosition() {
if (_is != null) {
return _is.getPosition();
} else {
return -1;
}
}
/**
* Sets the current location in the file.
*/
@Override
public boolean setPosition(long offset) {
if (_is == null) {
return false;
}
_isEOF = false;
try {
return _is.setPosition(offset);
} catch (IOException e) {
throw new QuercusModuleException(e);
}
}
@Override
public Value stat() {
return BooleanValue.FALSE;
}
/**
* Converts to a string.
*/
@Override
public String toString() {
if (_is != null) {
return "BufferedBinaryInputOutput[" + _is.getPath() + "]";
} else {
return "BufferedBinaryInputOutput[closed]";
}
}
}