/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program 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; version 2 of the License.
This program 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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Mar 7, 2012
*/
package com.bigdata.rdf.sail.webapp.client;
import java.util.LinkedList;
import java.util.List;
import org.apache.log4j.Logger;
import com.bigdata.util.NV;
/**
* Extract and return the quality score for the mime type (defaults to
* <code>1.0</code>).
*
* Note: <a
* href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1">the
* grammar</a> permits whitespace fairly generally, but the parser in this class
* does not cope with this correctly, but largely assumes that such whitespace
* is omitted.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*
* TODO Lift out patterns.
*/
public class MiniMime {
static private final Logger log = Logger.getLogger(MiniMime.class);
/**
* The extracted quality score for the MIME Type (<code>q=...</code>).
*/
public final float q;
private final String mimeType;
/**
* The parsed name=value MIME Type parameters. The tail of the array MAY
* have one or more null elements. You can just break out of the loop when
* you hit the first <code>null</code> MIME type parameter name.
*/
private final List<NV> params = new LinkedList<NV>();
/**
*
* @param s
* The value to be parsed.
*
* @throws NullPointerException
* if the argument is <code>null</code>
*/
public MiniMime(final String s) {
final String[] b = s.split(";");
mimeType = b[0].trim();
float q = 1f;
// params = new String[b.length][];
for (int i = 1; i < b.length; i++) {
final String c = b[i];
final String[] d = c.split("=");
if (d.length < 2)
continue;
params.add(new NV(d[0].trim(), d[1].trim()));
// params[i] = d;
// params[i][0] = d[0];
// params[i][1] = d[1];
if (!d[0].equals("q"))
continue;
q = Float.valueOf(d[1]);
}
if (log.isDebugEnabled())
log.debug("Considering: " + s + " :: q=" + q);
this.q = q;
}
/**
* The MIME type without any MIME parameters.
*/
public String getMimeType() {
return mimeType;
}
/**
* Return the first value for the named MIME type parameter.
*
* @param name
* The parameter name (case sensitive).
* @param def
* The default value (optional).
*
* @return The value for that parameter and the caller's default value
* otherwise.
*/
public String getParam(final String name, final String def) {
if (name == null)
throw new IllegalArgumentException();
for (NV nv : params) {
if (name.equals(nv.getName())) {
return nv.getValue();
}
}
return def;
}
/**
* Return the value of the <code>charset</code>.
* <p>
* Note: Per Section 3.7.1 Canonicalization and Text Defaults of the HTTP
* 1.1 specification:
* <ul>
* <li>
* The "charset" parameter is used with some media types to define the
* character set (section 3.4) of the data. When no explicit charset
* parameter is provided by the sender, media subtypes of the "text" type
* are defined to have a default charset value of "ISO-8859-1" when received
* via HTTP. Data in character sets other than "ISO-8859-1" or its subsets
* MUST be labeled with an appropriate charset value. See section 3.4.1 for
* compatibility problems.</li>
* </ul>
*
* @return The value of the <code>charset</code> parameter and
* <code>null</code> if that parameter was not given.
*/
public String getContentEncoding() {
// return getParam("charset","ISO-8859-1");
return getParam("charset", null);
}
}