org.eclipse.jetty.server.InclusiveByteRange Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of ehcache Show documentation
Show all versions of ehcache Show documentation
Ehcache is an open source, standards-based cache used to boost performance,
offload the database and simplify scalability. Ehcache is robust, proven and full-featured and
this has made it the most widely-used Java-based cache.
//
// ========================================================================
// Copyright (c) 1995-2012 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.server;
import java.util.Enumeration;
import java.util.List;
import java.util.StringTokenizer;
import org.eclipse.jetty.util.LazyList;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
/** Byte range inclusive of end points.
*
*
* parses the following types of byte ranges:
*
* bytes=100-499
* bytes=-300
* bytes=100-
* bytes=1-2,2-3,6-,-2
*
* given an entity length, converts range to string
*
* bytes 100-499/500
*
*
*
* Based on RFC2616 3.12, 14.16, 14.35.1, 14.35.2
* @version $version$
*
*/
public class InclusiveByteRange
{
private static final Logger LOG = Log.getLogger(InclusiveByteRange.class);
long first = 0;
long last = 0;
public InclusiveByteRange(long first, long last)
{
this.first = first;
this.last = last;
}
public long getFirst()
{
return first;
}
public long getLast()
{
return last;
}
/* ------------------------------------------------------------ */
/**
* @param headers Enumeration of Range header fields.
* @param size Size of the resource.
* @return LazyList of satisfiable ranges
*/
public static List satisfiableRanges(Enumeration headers, long size)
{
Object satRanges=null;
// walk through all Range headers
headers:
while (headers.hasMoreElements())
{
String header = (String) headers.nextElement();
StringTokenizer tok = new StringTokenizer(header,"=,",false);
String t=null;
try
{
// read all byte ranges for this header
while (tok.hasMoreTokens())
{
try
{
t = tok.nextToken().trim();
long first = -1;
long last = -1;
int d = t.indexOf('-');
if (d < 0 || t.indexOf("-",d + 1) >= 0)
{
if ("bytes".equals(t))
continue;
LOG.warn("Bad range format: {}",t);
continue headers;
}
else if (d == 0)
{
if (d + 1 < t.length())
last = Long.parseLong(t.substring(d + 1).trim());
else
{
LOG.warn("Bad range format: {}",t);
continue;
}
}
else if (d + 1 < t.length())
{
first = Long.parseLong(t.substring(0,d).trim());
last = Long.parseLong(t.substring(d + 1).trim());
}
else
first = Long.parseLong(t.substring(0,d).trim());
if (first == -1 && last == -1)
continue headers;
if (first != -1 && last != -1 && (first > last))
continue headers;
if (first < size)
{
InclusiveByteRange range = new InclusiveByteRange(first,last);
satRanges = LazyList.add(satRanges,range);
}
}
catch (NumberFormatException e)
{
LOG.warn("Bad range format: {}",t);
LOG.ignore(e);
continue;
}
}
}
catch(Exception e)
{
LOG.warn("Bad range format: {}",t);
LOG.ignore(e);
}
}
return LazyList.getList(satRanges,true);
}
/* ------------------------------------------------------------ */
public long getFirst(long size)
{
if (first<0)
{
long tf=size-last;
if (tf<0)
tf=0;
return tf;
}
return first;
}
/* ------------------------------------------------------------ */
public long getLast(long size)
{
if (first<0)
return size-1;
if (last<0 ||last>=size)
return size-1;
return last;
}
/* ------------------------------------------------------------ */
public long getSize(long size)
{
return getLast(size)-getFirst(size)+1;
}
/* ------------------------------------------------------------ */
public String toHeaderRangeString(long size)
{
StringBuilder sb = new StringBuilder(40);
sb.append("bytes ");
sb.append(getFirst(size));
sb.append('-');
sb.append(getLast(size));
sb.append("/");
sb.append(size);
return sb.toString();
}
/* ------------------------------------------------------------ */
public static String to416HeaderRangeString(long size)
{
StringBuilder sb = new StringBuilder(40);
sb.append("bytes */");
sb.append(size);
return sb.toString();
}
/* ------------------------------------------------------------ */
@Override
public String toString()
{
StringBuilder sb = new StringBuilder(60);
sb.append(Long.toString(first));
sb.append(":");
sb.append(Long.toString(last));
return sb.toString();
}
}