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1 /* |
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2 * ==================================================================== |
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3 * Licensed to the Apache Software Foundation (ASF) under one |
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4 * or more contributor license agreements. See the NOTICE file |
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5 * distributed with this work for additional information |
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6 * regarding copyright ownership. The ASF licenses this file |
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7 * to you under the Apache License, Version 2.0 (the |
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8 * "License"); you may not use this file except in compliance |
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9 * with the License. You may obtain a copy of the License at |
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10 * |
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11 * http://www.apache.org/licenses/LICENSE-2.0 |
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12 * |
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13 * Unless required by applicable law or agreed to in writing, |
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14 * software distributed under the License is distributed on an |
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15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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16 * KIND, either express or implied. See the License for the |
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17 * specific language governing permissions and limitations |
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18 * under the License. |
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19 * ==================================================================== |
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20 * |
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21 * This software consists of voluntary contributions made by many |
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22 * individuals on behalf of the Apache Software Foundation. For more |
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23 * information on the Apache Software Foundation, please see |
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24 * <http://www.apache.org/>. |
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25 * |
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26 */ |
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27 |
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28 package ch.boye.httpclientandroidlib.message; |
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29 |
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30 import ch.boye.httpclientandroidlib.HeaderElement; |
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31 import ch.boye.httpclientandroidlib.NameValuePair; |
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32 import ch.boye.httpclientandroidlib.ParseException; |
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33 import ch.boye.httpclientandroidlib.util.CharArrayBuffer; |
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34 |
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35 /** |
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36 * Interface for parsing header values into elements. |
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37 * Instances of this interface are expected to be stateless and thread-safe. |
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38 * |
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39 * @since 4.0 |
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40 */ |
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41 public interface HeaderValueParser { |
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42 |
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43 /** |
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44 * Parses a header value into elements. |
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45 * Parse errors are indicated as <code>RuntimeException</code>. |
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46 * <p> |
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47 * Some HTTP headers (such as the set-cookie header) have values that |
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48 * can be decomposed into multiple elements. In order to be processed |
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49 * by this parser, such headers must be in the following form: |
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50 * </p> |
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51 * <pre> |
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52 * header = [ element ] *( "," [ element ] ) |
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53 * element = name [ "=" [ value ] ] *( ";" [ param ] ) |
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54 * param = name [ "=" [ value ] ] |
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55 * |
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56 * name = token |
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57 * value = ( token | quoted-string ) |
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58 * |
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59 * token = 1*<any char except "=", ",", ";", <"> and |
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60 * white space> |
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61 * quoted-string = <"> *( text | quoted-char ) <"> |
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62 * text = any char except <"> |
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63 * quoted-char = "\" char |
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64 * </pre> |
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65 * <p> |
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66 * Any amount of white space is allowed between any part of the |
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67 * header, element or param and is ignored. A missing value in any |
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68 * element or param will be stored as the empty {@link String}; |
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69 * if the "=" is also missing <var>null</var> will be stored instead. |
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70 * </p> |
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71 * |
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72 * @param buffer buffer holding the header value to parse |
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73 * @param cursor the parser cursor containing the current position and |
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74 * the bounds within the buffer for the parsing operation |
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75 * |
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76 * @return an array holding all elements of the header value |
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77 * |
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78 * @throws ParseException in case of a parse error |
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79 */ |
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80 HeaderElement[] parseElements( |
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81 CharArrayBuffer buffer, |
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82 ParserCursor cursor) throws ParseException; |
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83 |
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84 /** |
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85 * Parses a single header element. |
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86 * A header element consist of a semicolon-separate list |
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87 * of name=value definitions. |
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88 * |
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89 * @param buffer buffer holding the element to parse |
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90 * @param cursor the parser cursor containing the current position and |
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91 * the bounds within the buffer for the parsing operation |
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92 * |
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93 * @return the parsed element |
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94 * |
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95 * @throws ParseException in case of a parse error |
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96 */ |
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97 HeaderElement parseHeaderElement( |
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98 CharArrayBuffer buffer, |
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99 ParserCursor cursor) throws ParseException; |
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100 |
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101 /** |
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102 * Parses a list of name-value pairs. |
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103 * These lists are used to specify parameters to a header element. |
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104 * Parse errors are indicated as <code>ParseException</code>. |
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105 * |
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106 * @param buffer buffer holding the name-value list to parse |
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107 * @param cursor the parser cursor containing the current position and |
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108 * the bounds within the buffer for the parsing operation |
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109 * |
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110 * @return an array holding all items of the name-value list |
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111 * |
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112 * @throws ParseException in case of a parse error |
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113 */ |
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114 NameValuePair[] parseParameters( |
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115 CharArrayBuffer buffer, |
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116 ParserCursor cursor) throws ParseException; |
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117 |
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118 |
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119 /** |
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120 * Parses a name=value specification, where the = and value are optional. |
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121 * |
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122 * @param buffer the buffer holding the name-value pair to parse |
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123 * @param cursor the parser cursor containing the current position and |
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124 * the bounds within the buffer for the parsing operation |
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125 * |
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126 * @return the name-value pair, where the value is <code>null</code> |
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127 * if no value is specified |
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128 */ |
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129 NameValuePair parseNameValuePair( |
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130 CharArrayBuffer buffer, |
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131 ParserCursor cursor) throws ParseException; |
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132 |
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133 } |
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134 |