httpfields.java

jetty SERVER連接資料庫用的軟體

        if (fields == null) return;

        Enumeration e = fields.getFieldNames();
        while (e.hasMoreElements())
        {
            String name = (String) e.nextElement();
            Enumeration values = fields.getValues(name);
            while (values.hasMoreElements())
                add(name, (String) values.nextElement());
        }
    }

    /* ------------------------------------------------------------ */
    /**
     * Get field value parameters. Some field values can have parameters. This method separates the
     * value from the parameters and optionally populates a map with the paramters. For example:
     * 
     * <PRE>
     * 
     * FieldName : Value ; param1=val1 ; param2=val2
     * 
     * </PRE>
     * 
     * @param value The Field value, possibly with parameteres.
     * @param parameters A map to populate with the parameters, or null
     * @return The value.
     */
    public static String valueParameters(String value, Map parameters)
    {
        if (value == null) return null;

        int i = value.indexOf(';');
        if (i < 0) return value;
        if (parameters == null) return value.substring(0, i).trim();

        StringTokenizer tok1 = new QuotedStringTokenizer(value.substring(i), ";", false, true);
        while (tok1.hasMoreTokens())
        {
            String token = tok1.nextToken();
            StringTokenizer tok2 = new QuotedStringTokenizer(token, "= ");
            if (tok2.hasMoreTokens())
            {
                String paramName = tok2.nextToken();
                String paramVal = null;
                if (tok2.hasMoreTokens()) paramVal = tok2.nextToken();
                parameters.put(paramName, paramVal);
            }
        }

        return value.substring(0, i).trim();
    }

    /* ------------------------------------------------------------ */
    private static Float __one = new Float("1.0");
    private static Float __zero = new Float("0.0");
    private static StringMap __qualities = new StringMap();
    static
    {
        __qualities.put(null, __one);
        __qualities.put("1.0", __one);
        __qualities.put("1", __one);
        __qualities.put("0.9", new Float("0.9"));
        __qualities.put("0.8", new Float("0.8"));
        __qualities.put("0.7", new Float("0.7"));
        __qualities.put("0.66", new Float("0.66"));
        __qualities.put("0.6", new Float("0.6"));
        __qualities.put("0.5", new Float("0.5"));
        __qualities.put("0.4", new Float("0.4"));
        __qualities.put("0.33", new Float("0.33"));
        __qualities.put("0.3", new Float("0.3"));
        __qualities.put("0.2", new Float("0.2"));
        __qualities.put("0.1", new Float("0.1"));
        __qualities.put("0", __zero);
        __qualities.put("0.0", __zero);
    }

    /* ------------------------------------------------------------ */
    public static Float getQuality(String value)
    {
        if (value == null) return __zero;

        int qe = value.indexOf(";");
        if (qe++ < 0 || qe == value.length()) return __one;

        if (value.charAt(qe++) == 'q')
        {
            qe++;
            Map.Entry entry = __qualities.getEntry(value, qe, value.length() - qe);
            if (entry != null) return (Float) entry.getValue();
        }

        HashMap params = new HashMap(3);
        valueParameters(value, params);
        String qs = (String) params.get("q");
        Float q = (Float) __qualities.get(qs);
        if (q == null)
        {
            try
            {
                q = new Float(qs);
            }
            catch (Exception e)
            {
                q = __one;
            }
        }
        return q;
    }

    /* ------------------------------------------------------------ */
    /**
     * List values in quality order.
     * 
     * @param enum Enumeration of values with quality parameters
     * @return values in quality order.
     */
    public static List qualityList(Enumeration e)
    {
        if (e == null || !e.hasMoreElements()) return Collections.EMPTY_LIST;

        Object list = null;
        Object qual = null;

        // Assume list will be well ordered and just add nonzero
        while (e.hasMoreElements())
        {
            String v = e.nextElement().toString();
            Float q = getQuality(v);

            if (q.floatValue() >= 0.001)
            {
                list = LazyList.add(list, v);
                qual = LazyList.add(qual, q);
            }
        }

        List vl = LazyList.getList(list, false);
        if (vl.size() < 2) return vl;

        List ql = LazyList.getList(qual, false);

        // sort list with swaps
        Float last = __zero;
        for (int i = vl.size(); i-- > 0;)
        {
            Float q = (Float) ql.get(i);
            if (last.compareTo(q) > 0)
            {
                Object tmp = vl.get(i);
                vl.set(i, vl.get(i + 1));
                vl.set(i + 1, tmp);
                ql.set(i, ql.get(i + 1));
                ql.set(i + 1, q);
                last = __zero;
                i = vl.size();
                continue;
            }
            last = q;
        }
        ql.clear();
        return vl;
    }

    /* ------------------------------------------------------------ */
    /* ------------------------------------------------------------ */
    /* ------------------------------------------------------------ */
    public static final class Field
    {
        private Buffer _name;
        private Buffer _value;
        private String _stringValue;
        private long _numValue;
        private Field _next;
        private Field _prev;
        private int _revision;

        /* ------------------------------------------------------------ */
        private Field(Buffer name, Buffer value, long numValue, int revision)
        {
            _name = name.asImmutableBuffer();
            _value = value.isImmutable() ? value : new View(value);
            _next = null;
            _prev = null;
            _revision = revision;
            _numValue = numValue;
            _stringValue=null;
        }

        /* ------------------------------------------------------------ */
        private void clear()
        {
            _revision = -1;
        }

        /* ------------------------------------------------------------ */
        private void destroy()
        {
            _name = null;
            _value = null;
            _next = null;
            _prev = null;
            _stringValue=null;
        }

        /* ------------------------------------------------------------ */
        /**
         * Reassign a value to this field. Checks if the string value is the same as that in the char
         * array, if so then just reuse existing value.
         */
        private void reset(Buffer value, long numValue, int revision)
        {
            _revision = revision;
            if (_value == null)
            {
                _value = value.isImmutable() ? value : new View(value);
                _numValue = numValue;
                _stringValue=null;
            }
            else if (value.isImmutable())
            {
                _value = value;
                _numValue = numValue;
                _stringValue=null;
            }
            else
            {
                if (_value instanceof View)
                    ((View) _value).update(value);
                else
                    _value = new View(value);
                _numValue = numValue;
                
                // check to see if string value is still valid.
                if (_stringValue!=null)
                {
                    if (_stringValue.length()!=value.length())
                        _stringValue=null;
                    else
                    {
                        for (int i=value.length();i-->0;)
                        {
                            if (value.peek(value.getIndex()+i)!=_stringValue.charAt(i))
                            {
                                _stringValue=null;
                                break;
                            }
                        }
                    }
                }
            }
        }
        
        

        /* ------------------------------------------------------------ */
        public void put(Buffer buffer) throws IOException
        {
            int o=(_name instanceof CachedBuffer)?((CachedBuffer)_name).getOrdinal():-1;
            if (o>=0)
                buffer.put(_name);
            else
            {
                int s=_name.getIndex();
                int e=_name.putIndex();
                while (s<e)
                {
                    byte b=_name.peek(s++);
                    switch(b)
                    {
                        case '\r':
                        case '\n':
                        case ':' :
                            continue;
                        default:
                            buffer.put(b);
                    }
                }
            }
            
            buffer.put((byte) ':');
            buffer.put((byte) ' ');
            
            o=(_value instanceof CachedBuffer)?((CachedBuffer)_value).getOrdinal():-1;
            if (o>=0 || _numValue>=0)
                buffer.put(_value);
            else
            {
                int s=_value.getIndex();
                int e=_value.putIndex();
                while (s<e)
                {
                    byte b=_value.peek(s++);
                    switch(b)
                    {
                        case '\r':
                        case '\n':
                            continue;
                        default:
                            buffer.put(b);
                    }
                }
            }

            BufferUtil.putCRLF(buffer);
        }

        /* ------------------------------------------------------------ */
        public String getName()
        {
            return BufferUtil.to8859_1_String(_name);
        }

        /* ------------------------------------------------------------ */
        Buffer getNameBuffer()
        {
            return _name;
        }

        /* ------------------------------------------------------------ */
        public int getNameOrdinal()
        {
            return HttpHeaders.CACHE.getOrdinal(_name);
        }

        /* ------------------------------------------------------------ */
        public String getValue()
        {
            if (_stringValue==null)
                _stringValue=BufferUtil.to8859_1_String(_value);
            return _stringValue;
        }

        /* ------------------------------------------------------------ */
        public Buffer getValueBuffer()
        {
            return _value;
        }

        /* ------------------------------------------------------------ */
        public int getValueOrdinal()
        {
            return HttpHeaderValues.CACHE.getOrdinal(_value);
        }

        /* ------------------------------------------------------------ */
        public int getIntValue()
        {
            return (int) getLongValue();
        }

        /* ------------------------------------------------------------ */
        public long getLongValue()
        {
            if (_numValue == -1) _numValue = BufferUtil.toLong(_value);
            return _numValue;
        }

        /* ------------------------------------------------------------ */
        public String toString()
        {
            return ("[" + (_prev == null ? "" : "<-") + getName() + "="+_revision+"=" + _value + (_next == null ? "" : "->") + "]");
        }
    }

}