| 1 | package dolda.jsvc.util; |
| 2 | |
| 3 | import java.util.*; |
| 4 | import java.io.*; |
| 5 | |
| 6 | public class AcceptMap implements Iterable<AcceptMap.Entry> { |
| 7 | private static final Entry[] typehint = new Entry[0]; |
| 8 | private final Entry[] list; |
| 9 | private static final Comparator<Entry> lcmp = new Comparator<Entry>() { |
| 10 | public int compare(Entry a, Entry b) { |
| 11 | if(a.q > b.q) |
| 12 | return(-1); |
| 13 | else if(a.q < b.q) |
| 14 | return(1); |
| 15 | return(0); |
| 16 | } |
| 17 | }; |
| 18 | |
| 19 | public static class Entry { |
| 20 | public String type; |
| 21 | public double q = 1.0; |
| 22 | public Map<String, String> pars = new HashMap<String, String>(); |
| 23 | } |
| 24 | |
| 25 | private AcceptMap(Entry[] list) { |
| 26 | this.list = list; |
| 27 | } |
| 28 | |
| 29 | private static String token(PushbackReader in) throws IOException { |
| 30 | Misc.eatws(in); |
| 31 | StringBuilder buf = new StringBuilder(); |
| 32 | while(true) { |
| 33 | int c = in.read(); |
| 34 | if((c < 0) || Character.isWhitespace((char)c) || (",;=:\\\"?".indexOf((char)c) >= 0)) { |
| 35 | if(c >= 0) |
| 36 | in.unread(c); |
| 37 | if(buf.length() == 0) |
| 38 | return(null); |
| 39 | return(buf.toString()); |
| 40 | } else { |
| 41 | buf.append((char)c); |
| 42 | } |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | public static AcceptMap parse(Reader in) throws IOException { |
| 47 | PushbackReader pin = new PushbackReader(in); |
| 48 | List<Entry> lbuf = new LinkedList<Entry>(); |
| 49 | List<Entry> ebuf = new LinkedList<Entry>(); |
| 50 | while(true) { |
| 51 | Entry e = new Entry(); |
| 52 | if((e.type = token(pin)) == null) |
| 53 | throw(new Http.EncodingException("Illegal format for Accept* header (expected type)")); |
| 54 | ebuf.add(e); |
| 55 | Misc.eatws(pin); |
| 56 | int sep = pin.read(); |
| 57 | if(sep < 0) { |
| 58 | lbuf.addAll(ebuf); |
| 59 | break; |
| 60 | } else if(sep == ';') { |
| 61 | String st = "tp"; |
| 62 | boolean flush = false; |
| 63 | boolean end = false; |
| 64 | while(true) { |
| 65 | String key = Http.tokenunquote(pin); |
| 66 | Misc.eatws(pin); |
| 67 | if(pin.read() != '=') |
| 68 | throw(new Http.EncodingException("Illegal format for Accept* header (expected `=' in parameter)")); |
| 69 | String val = Http.tokenunquote(pin); |
| 70 | Misc.eatws(pin); |
| 71 | int psep = pin.read(); |
| 72 | if(st == "tp") { |
| 73 | if(key.equals("q")) { |
| 74 | double q; |
| 75 | try { |
| 76 | q = Double.parseDouble(val); |
| 77 | } catch(NumberFormatException exc) { |
| 78 | throw(new Http.EncodingException(exc.getMessage())); |
| 79 | } |
| 80 | for(Entry e2 : ebuf) |
| 81 | e2.q = q; |
| 82 | flush = true; |
| 83 | st = "ap"; |
| 84 | } else { |
| 85 | e.pars.put(key, val); |
| 86 | } |
| 87 | } else if(st == "ap") { |
| 88 | /* No known accept-params */ |
| 89 | } |
| 90 | if(psep < 0) { |
| 91 | end = true; |
| 92 | flush = true; |
| 93 | break; |
| 94 | } else if(psep == ';') { |
| 95 | } else if(psep == ',') { |
| 96 | break; |
| 97 | } else { |
| 98 | throw(new Http.EncodingException("Illegal format for Accept* header (expected `;', `,' or end of parameters)")); |
| 99 | } |
| 100 | } |
| 101 | if(flush) { |
| 102 | lbuf.addAll(ebuf); |
| 103 | ebuf = new LinkedList<Entry>(); |
| 104 | } |
| 105 | if(end) |
| 106 | break; |
| 107 | } else if(sep == ',') { |
| 108 | } else { |
| 109 | throw(new Http.EncodingException("Illegal format for Accept* header (expected `;', `,' or end of list)")); |
| 110 | } |
| 111 | } |
| 112 | Entry[] list = lbuf.toArray(typehint); |
| 113 | Arrays.sort(list, lcmp); |
| 114 | return(new AcceptMap(list)); |
| 115 | } |
| 116 | |
| 117 | public static AcceptMap parse(String input) { |
| 118 | try { |
| 119 | return(parse(new StringReader(input))); |
| 120 | } catch(IOException e) { |
| 121 | throw(new Error(e)); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | public Iterator<Entry> iterator() { |
| 126 | return(new Iterator<Entry>() { |
| 127 | private int i = 0; |
| 128 | |
| 129 | public Entry next() { |
| 130 | return(list[i++]); |
| 131 | } |
| 132 | |
| 133 | public boolean hasNext() { |
| 134 | return(i < list.length); |
| 135 | } |
| 136 | |
| 137 | public void remove() { |
| 138 | throw(new UnsupportedOperationException()); |
| 139 | } |
| 140 | }); |
| 141 | } |
| 142 | |
| 143 | public Entry accepts(String type) { |
| 144 | for(Entry e : list) { |
| 145 | if(e.type.equals(type)) |
| 146 | return(e); |
| 147 | } |
| 148 | return(null); |
| 149 | } |
| 150 | |
| 151 | public String toString() { |
| 152 | StringBuilder buf = new StringBuilder(); |
| 153 | for(Entry e : list) |
| 154 | buf.append(String.format("%s %f %s\n", e.type, e.q, e.pars)); |
| 155 | return(buf.toString()); |
| 156 | } |
| 157 | } |