/*
* Copyright (c) 1998-2011 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.VfsStream;
import java.io.IOException;
import java.io.InputStream;
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
*/
public class ReadStreamInput extends InputStream implements BinaryInput {
private static final Logger log
= Logger.getLogger(ReadStreamInput.class.getName());
private Env _env;
private LineReader _lineReader;
private ReadStream _is;
public ReadStreamInput(Env env)
{
_env = env;
}
public ReadStreamInput(Env env, InputStream is)
{
_env = env;
if (is instanceof ReadStream)
init((ReadStream) is);
else if (is != null)
init(new ReadStream(new VfsStream(is, null)));
}
protected ReadStreamInput(Env env, LineReader lineReader)
{
_env = env;
_lineReader = lineReader;
}
protected ReadStreamInput(Env env, LineReader lineReader, ReadStream is)
{
this(env, lineReader);
init(is);
}
public void init(ReadStream is)
{
_is = is;
}
/**
* Returns the input stream.
*/
public InputStream getInputStream()
{
return _is;
}
/**
* Opens a copy.
*/
public BinaryInput openCopy()
throws IOException
{
return new ReadStreamInput(_env, _lineReader, _is.getPath().openRead());
}
public void setEncoding(String encoding)
throws UnsupportedEncodingException
{
if (_is != null)
_is.setEncoding(encoding);
}
/**
*
*/
public void unread()
throws IOException
{
if (_is != null)
_is.unread();
}
/**
* Reads a character from a file, returning -1 on EOF.
*/
public int read()
throws IOException
{
if (_is != null)
return _is.read();
else
return -1;
}
/**
* Reads a buffer from a file, returning -1 on EOF.
*/
@Override
public int read(byte []buffer, int offset, int length)
throws IOException
{
ReadStream is = _is;
if (is == null)
return -1;
int readLength = 0;
do {
int sublen = is.read(buffer, offset, length);
if (sublen < 0)
return readLength > 0 ? readLength : sublen;
readLength += sublen;
length -= sublen;
offset += sublen;
} while (length > 0 && is.getAvailable() > 0);
return readLength;
}
/**
* Reads a buffer from a file, returning -1 on EOF.
*/
public int read(char []buffer, int offset, int length)
throws IOException
{
if (_is != null) {
return _is.read(buffer, offset, length);
}
else
return -1;
}
/**
* Reads into a binary builder.
*/
public StringValue read(int length)
throws IOException
{
if (_is == null)
return null;
StringValue bb = _env.createBinaryBuilder();
bb.appendReadAll(_is, length);
return bb;
}
/**
* Reads the optional linefeed character from a \r\n
*/
public boolean readOptionalLinefeed()
throws IOException
{
if (_is == null)
return false;
int ch = _is.read();
if (ch == '\n') {
return true;
}
else {
_is.unread();
return false;
}
}
public void writeToStream(OutputStream os, int length)
throws IOException
{
if (_is != null) {
_is.writeToStream(os, length);
}
}
/**
* Appends to a string builder.
*/
public StringValue appendTo(StringValue builder)
{
if (_is != null)
return builder.append(_is);
else
return builder;
}
/**
* Reads a line from a file, returning null on EOF.
*/
public StringValue readLine(long length)
throws IOException
{
return getLineReader().readLine(_env, this, length);
}
/**
* Returns true on the EOF.
*/
public boolean isEOF()
{
if (_is == null)
return true;
else {
try {
// XXX: not quite right for sockets
return _is.available() <= 0;
} catch (IOException e) {
log.log(Level.FINE, e.toString(), e);
return true;
}
}
}
/**
* Returns the current location in the file.
*/
public long getPosition()
{
if (_is == null)
return -1;
else
return _is.getPosition();
}
/**
* Returns the current location in the file.
*/
public boolean setPosition(long offset)
{
if (_is == null)
return false;
try {
return _is.setPosition(offset);
} catch (IOException e) {
throw new QuercusModuleException(e);
}
}
public long seek(long offset, int whence)
{
long position;
switch (whence) {
case BinaryStream.SEEK_CUR:
position = getPosition() + offset;
break;
case BinaryStream.SEEK_END:
// don't necessarily have an end
position = getPosition();
break;
case BinaryStream.SEEK_SET:
default:
position = offset;
break;
}
if (! setPosition(position))
return -1L;
else
return position;
}
public Value stat()
{
return BooleanValue.FALSE;
}
private LineReader getLineReader()
{
if (_lineReader == null)
_lineReader = new LineReader(_env);
return _lineReader;
}
/**
* Closes the stream for reading.
*/
public void closeRead()
{
close();
}
/**
* Closes the file.
*/
public void close()
{
ReadStream is = _is;
_is = null;
if (is != null)
is.close();
}
public Object toJavaObject()
{
return this;
}
public String getResourceType()
{
return "stream";
}
/**
* Converts to a string.
*/
public String toString()
{
return "ReadStreamInput[" + _is.getPath() + "]";
}
}