/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.http;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.provider.AbstractRandomAccessStreamContent;
import org.apache.commons.vfs.util.MonitorInputStream;
import org.apache.commons.vfs.util.RandomAccessMode;
import java.io.DataInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
class HttpRandomAccesContent extends AbstractRandomAccessStreamContent
{
private final HttpFileObject fileObject;
private final HttpFileSystem fileSystem;
protected long filePointer = 0;
private DataInputStream dis = null;
private MonitorInputStream mis = null;
HttpRandomAccesContent(final HttpFileObject fileObject, RandomAccessMode mode)
{
super(mode);
this.fileObject = fileObject;
fileSystem = (HttpFileSystem) 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;
}
protected DataInputStream getDataInputStream() throws IOException
{
if (dis != null)
{
return dis;
}
final GetMethod getMethod = new GetMethod();
fileObject.setupMethod(getMethod);
getMethod.setRequestHeader("Range", "bytes=" + filePointer + "-");
final int status = fileSystem.getClient().executeMethod(getMethod);
if (status != HttpURLConnection.HTTP_PARTIAL)
{
throw new FileSystemException("vfs.provider.http/get-range.error", new Object[]
{
fileObject.getName(),
new Long(filePointer)
});
}
mis = new HttpFileObject.HttpInputStream(getMethod);
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;
}
});
return dis;
}
public void close() throws IOException
{
if (dis != null)
{
dis.close();
dis = null;
mis = null;
}
}
public long length() throws IOException
{
return fileObject.getContent().getSize();
}
}