/*
* 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.resources;
import com.caucho.quercus.QuercusException;
import com.caucho.quercus.env.Env;
import com.caucho.quercus.env.EnvCleanup;
import com.caucho.quercus.env.StringValue;
import com.caucho.quercus.env.UnicodeValueImpl;
import com.caucho.vfs.ReadStream;
import com.caucho.vfs.WriteStream;
import java.io.IOException;
/**
* Represents read/write stream
*/
public class StreamReadWrite extends StreamResource
implements EnvCleanup
{
private Env _env;
private ReadStream _is;
private WriteStream _os;
public StreamReadWrite(Env env)
{
_env = env;
_env.addCleanup(this);
}
public StreamReadWrite(Env env, ReadStream is, WriteStream os)
{
this(env);
init(is, os);
}
protected void init(ReadStream is, WriteStream os)
{
_is = is;
_os = os;
}
/**
* Reads the next byte, returning -1 on eof.
*/
public int read()
throws IOException
{
if (_is != null)
return _is.read();
else
return -1;
}
/**
* Reads a buffer, returning -1 on eof.
*/
public int read(byte []buffer, int offset, int length)
throws IOException
{
if (_is != null)
return _is.read(buffer, offset, length);
else
return -1;
}
/**
* Reads the optional linefeed character from a \r\n
*/
public boolean readOptionalLinefeed()
throws IOException
{
if (_is != null) {
int ch = _is.read();
if (ch == '\n') {
return true;
}
else {
_is.unread();
return false;
}
}
else
return false;
}
/**
* Reads a line from the buffer.
*/
@Override
public StringValue readLine(Env env)
throws IOException
{
if (_is != null)
return env.createString(_is.readLineNoChop());
else
return env.getEmptyString();
}
/**
* Reads a line from the stream into a buffer.
*/
public int readLine(char []buffer)
{
try {
if (_is != null)
return _is.readLine(buffer, buffer.length, false);
else
return -1;
} catch (IOException e) {
return -1;
}
}
/**
* Writes to a buffer.
*/
public int write(byte []buffer, int offset, int length)
throws IOException
{
if (_os != null) {
_os.write(buffer, offset, length);
return length;
} else {
return -1;
}
}
/**
* prints
*/
public void print(char ch)
throws IOException
{
print(String.valueOf(ch));
}
/**
* prints
*/
public void print(String s)
throws IOException
{
if (_os != null)
_os.print(s);
}
/**
* Returns true on the end of file.
*/
public boolean isEOF()
{
return true;
}
/**
* Flushes the output
*/
public void flush()
{
try {
if (_os != null)
_os.flush();
} catch (IOException e) {
throw new QuercusException(e);
}
}
/**
* Returns the current location in the file.
*/
public long getPosition()
{
return 0;
}
/**
* Closes the stream for reading.
*/
public void closeRead()
{
ReadStream is = _is;
_is = null;
if (is != null)
is.close();
}
/**
* Closes the stream for writing
*/
public void closeWrite()
{
WriteStream os = _os;
_os = null;
try {
if (os != null)
os.close();
} catch (IOException e) {
}
}
/**
* Closes the stream.
*/
public void close()
{
_env.removeCleanup(this);
cleanup();
}
/**
* Implements the EnvCleanup interface.
*/
public void cleanup()
{
ReadStream is = _is;
_is = null;
WriteStream os = _os;
_os = null;
if (is != null)
is.close();
try {
if (os != null)
os.close();
} catch (IOException e) {
}
}
}