/*
* Copyright 2002-2005 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.vfs.provider.ftp;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.provider.AbstractRandomAccessContent;
import org.apache.commons.vfs.util.RandomAccessMode;
import java.io.DataInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
class FtpRandomAccessContent extends AbstractRandomAccessContent
{
private final FtpFileObject fileObject;
protected long filePointer = 0;
private DataInputStream dis = null;
private FtpFileObject.FtpInputStream mis = null;
FtpRandomAccessContent(final FtpFileObject fileObject, RandomAccessMode mode)
{
super(mode);
this.fileObject = fileObject;
// fileSystem = (FtpFileSystem) this.fileObject.getFileSystem();
}
public long getFilePointer() throws IOException
{
return filePointer;
}
public void seek(long pos) throws IOException
{
if (pos == filePointer)
{
// no change
return;
}
if (pos < 0)
{
throw new FileSystemException("vfs.provider/random-access-invalid-position.error",
new Object[]
{
new Long(pos)
});
}
if (dis != null)
{
close();
}
filePointer = pos;
}
private void createStream() throws IOException
{
if (dis != null)
{
return;
}
// FtpClient client = fileSystem.getClient();
mis = fileObject.getInputStream(filePointer);
dis = new DataInputStream(new FilterInputStream(mis)
{
public int read() throws IOException
{
int ret = super.read();
if (ret > -1)
{
filePointer++;
}
return ret;
}
public int read(byte b[]) throws IOException
{
int ret = super.read(b);
if (ret > -1)
{
filePointer+=ret;
}
return ret;
}
public int read(byte b[], int off, int len) throws IOException
{
int ret = super.read(b, off, len);
if (ret > -1)
{
filePointer+=ret;
}
return ret;
}
public void close() throws IOException
{
FtpRandomAccessContent.this.close();
}
});
}
public void close() throws IOException
{
if (dis != null)
{
mis.abort();
// this is to avoid recursive close
DataInputStream oldDis = dis;
dis = null;
oldDis.close();
mis = null;
}
}
public long length() throws IOException
{
return fileObject.getContent().getSize();
}
public byte readByte() throws IOException
{
createStream();
byte data = dis.readByte();
return data;
}
public char readChar() throws IOException
{
createStream();
char data = dis.readChar();
return data;
}
public double readDouble() throws IOException
{
createStream();
double data = dis.readDouble();
return data;
}
public float readFloat() throws IOException
{
createStream();
float data = dis.readFloat();
return data;
}
public int readInt() throws IOException
{
createStream();
int data = dis.readInt();
return data;
}
public int readUnsignedByte() throws IOException
{
createStream();
int data = dis.readUnsignedByte();
return data;
}
public int readUnsignedShort() throws IOException
{
createStream();
int data = dis.readUnsignedShort();
return data;
}
public long readLong() throws IOException
{
createStream();
long data = dis.readLong();
return data;
}
public short readShort() throws IOException
{
createStream();
short data = dis.readShort();
return data;
}
public boolean readBoolean() throws IOException
{
createStream();
boolean data = dis.readBoolean();
return data;
}
public int skipBytes(int n) throws IOException
{
createStream();
int data = dis.skipBytes(n);
return data;
}
public void readFully(byte b[]) throws IOException
{
createStream();
dis.readFully(b);
}
public void readFully(byte b[], int off, int len) throws IOException
{
createStream();
dis.readFully(b, off, len);
}
public String readUTF() throws IOException
{
createStream();
String data = dis.readUTF();
return data;
}
public InputStream getInputStream() throws IOException
{
createStream();
return dis;
}
}