package org.jboss.resteasy.util;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
/**
* Returns a sorted list of values by their qualifier 'q' with parameters pulled off.
*
* @author <a href="mailto:bill@burkecentral.com">Bill Burke</a>
* @version $Revision: 1 $
*/
public class AcceptParser
{
private static class Charset implements Comparable<Charset>
{
private String value;
private float q = 1.0F;
private Charset(String value, float q)
{
this.value = value;
this.q = q;
}
public int compareTo(Charset charset)
{
if (this == charset) return 0;
if (q == charset.q) return 0;
if (q < charset.q) return 1;
if (q > charset.q) return -1;
return 0;
}
}
private static Charset parseCharset(String charset)
{
String params = null;
int idx = charset.indexOf(";");
if (idx > -1)
{
params = charset.substring(idx + 1).trim();
charset = charset.substring(0, idx);
}
float q = 1.0F;
if (params != null && !params.equals(""))
{
HashMap<String, String> typeParams = new HashMap<String, String>();
int start = 0;
while (start < params.length())
{
start = HeaderParameterParser.setParam(typeParams, params, start);
}
String qval = typeParams.get("q");
if (qval != null)
{
q = Float.valueOf(qval);
}
}
return new Charset(charset, q);
}
/**
* Return list sorted with first most preferred
*
* @param header
* @return
*/
public static List<String> parseAcceptHeader(String header)
{
ArrayList<Charset> set = new ArrayList<Charset>();
String[] sets = header.split(",");
for (String charset : sets)
{
set.add(parseCharset(charset.trim()));
}
Collections.sort(set);
ArrayList<String> rtn = new ArrayList<String>();
for (Charset c : set)
{
rtn.add(c.value);
}
return rtn;
}
}