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package com.sun.tools.xjc.util;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.activation.MimeType;
import javax.activation.MimeTypeParseException;
/**
* @author Kohsuke Kawaguchi
*/
public class MimeTypeRange {
public final String majorType;
public final String subType;
public final Map<String,String> parameters = new HashMap<String, String>();
/**
* Each media-range MAY be followed by one or more accept-params,
* beginning with the "q" parameter for indicating a relative quality
* factor. The first "q" parameter (if any) separates the media-range
* parameter(s) from the accept-params. Quality factors allow the user
* or user agent to indicate the relative degree of preference for that
* media-range, using the qvalue scale from 0 to 1 (section 3.9). The
* default value is q=1.
*/
public final float q;
// accept-extension is not implemented
public static List<MimeTypeRange> parseRanges(String s) throws ParseException {
StringCutter cutter = new StringCutter(s,true);
List<MimeTypeRange> r = new ArrayList<MimeTypeRange>();
while(cutter.length()>0) {
r.add(new MimeTypeRange(cutter));
}
return r;
}
public MimeTypeRange(String s) throws ParseException {
this(new StringCutter(s,true));
}
/**
* Used only to produce the static constants within this class.
*/
private static MimeTypeRange create(String s) {
try {
return new MimeTypeRange(s);
} catch (ParseException e) {
// we only use this method for known inputs
throw new Error(e);
}
}
/**
* @param cutter
* A string like "text/html; charset=utf-8;
*/
private MimeTypeRange(StringCutter cutter) throws ParseException {
majorType = cutter.until("/");
cutter.next("/");
subType = cutter.until("[;,]");
float q = 1.0f;
while(cutter.length()>0) {
String sep = cutter.next("[;,]");
if(sep.equals(","))
break;
String key = cutter.until("=");
cutter.next("=");
String value;
char ch = cutter.peek();
if(ch=='"') {
// quoted
cutter.next("\"");
value = cutter.until("\"");
cutter.next("\"");
} else {
value = cutter.until("[;,]");
}
if(key.equals("q")) {
q = Float.parseFloat(value);
} else {
parameters.put(key,value);
}
}
this.q = q;
}
public MimeType toMimeType() throws MimeTypeParseException {
// due to the additional error check done in the MimeType class,
// an error at this point is possible
return new MimeType(toString());
}
public String toString() {
StringBuilder sb = new StringBuilder(majorType+'/'+subType);
if(q!=1)
sb.append("; q=").append(q);
for( Map.Entry<String,String> p : parameters.entrySet() ) {
// I'm too lazy to quote the value
sb.append("; ").append(p.getKey()).append('=').append(p.getValue());
}
return sb.toString();
}
public static final MimeTypeRange ALL = create("*/*");
/**
* Creates a range by merging all the given types.
*/
public static MimeTypeRange merge( Collection<MimeTypeRange> types ) {
if(types.size()==0) throw new IllegalArgumentException();
if(types.size()==1) return types.iterator().next();
String majorType=null;
for (MimeTypeRange mt : types) {
if(majorType==null) majorType = mt.majorType;
if(!majorType.equals(mt.majorType))
return ALL;
}
return create(majorType+"/*");
}
public static void main(String[] args) throws ParseException {
for( MimeTypeRange m : parseRanges(args[0]))
System.out.println(m.toString());
}
}