1 | package wjhk.jupload2.upload.helper;
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2 |
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3 | import wjhk.jupload2.context.JUploadContext;
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4 | import wjhk.jupload2.exception.JUploadIOException;
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5 | import wjhk.jupload2.upload.FileUploadThreadHTTP;
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6 |
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7 | /**
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8 | * This interface contains all technical methods to encode data, into a given
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9 | * character encoding. This is especially useful to encode the HTTP output to
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10 | * the server. <BR>
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11 | * <BR>
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12 | * Each appendXxxx method returns the current instance. This allows easy
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13 | * concatanation of calls to this class. For instance:<BR>
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14 | *
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15 | * <PRE>
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16 | * bae.append(a).appendFileProperty(b, c).append(d);
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17 | * </PRE>
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18 | *
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19 | * @author etienne_sf
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20 | * @see FileUploadThreadHTTP
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21 | */
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22 | public interface ByteArrayEncoder {
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23 |
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24 | /**
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25 | * Closes the encoding writer, and prepares the encoded length and byte
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26 | * array. This method must be called before call to
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27 | * {@link #getEncodedLength()} and {@link #getEncodedByteArray()}.
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28 | * <B>Note:</B> After a call to this method, you can not append any new data
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29 | * to the encoder.
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30 | *
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31 | * @throws JUploadIOException Encapsulates any IO Exception
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32 | */
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33 | public void close() throws JUploadIOException;
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34 |
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35 | /**
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36 | * Append a string, to be encoded at the current end of the byte array.
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37 | *
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38 | * @param str The string to append and encode.
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39 | * @return Return the current ByteArrayEncoder, to allow chained call (see
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40 | * explanation, here above).
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41 | * @throws JUploadIOException
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42 | */
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43 | public ByteArrayEncoder append(String str) throws JUploadIOException;
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44 |
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45 | /**
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46 | * Append a byte, to be encoded at the current end of the byte array. he
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47 | * byte to be written is the eight low-order bits of the argument b. The 24
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48 | * high-order bits of b are ignored.
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49 | *
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50 | * @param b Writes the specified byte to this output stream.
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51 | * @return Return the current ByteArrayEncoder, to allow chained call (see
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52 | * explanation, here above).
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53 | * @throws JUploadIOException
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54 | */
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55 | public ByteArrayEncoder append(int b) throws JUploadIOException;
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56 |
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57 | /**
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58 | * Append a stream, to be encoded at the current end of the byte array.
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59 | *
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60 | * @param b
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61 | * @return Return the current ByteArrayEncoder, to allow chained call (see
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62 | * explanation, here above).
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63 | * @throws JUploadIOException
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64 | */
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65 | public ByteArrayEncoder append(byte[] b) throws JUploadIOException;
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66 |
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67 | /**
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68 | * Append a property, name and value. It will be encoded at the current end
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69 | * of the byte array.<BR>
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70 | * Note: After the last call to appendTextProperty, you should call
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71 | * {@link #appendEndPropertyList()}, to properly finish the property list.
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72 | * In HTTP mode, it will add the last boundary, at a specific format.
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73 | *
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74 | * @param name Name of the property to be added
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75 | * @param value Value of this property for the current file. It's up to the
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76 | * caller to call this method at the right time.
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77 | * @param index Index of the file concerned by this value. -1 if this is a
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78 | * global parameter.
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79 | * @return Return the current ByteArrayEncoder, to allow chained call (see
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80 | * explanation, here above).
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81 | * @throws JUploadIOException
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82 | * @see #appendEndPropertyList()
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83 | */
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84 | public ByteArrayEncoder appendTextProperty(String name, String value,
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85 | int index) throws JUploadIOException;
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86 |
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87 | /**
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88 | * Finish a property list. In HTTP mode, the last boundary for the
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89 | * form/multipart content is added. After a call to this method, no more
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90 | * property may be written. If several ByteEncoder are used, it's up to the
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91 | * called to call this mehod only once, for the ByteEncoder that will be
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92 | * written last on the request.
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93 | *
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94 | * @return Return the current ByteArrayEncoder, to allow chained call (see
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95 | * explanation, here above).
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96 | * @throws JUploadIOException
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97 | */
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98 | public ByteArrayEncoder appendEndPropertyList() throws JUploadIOException;
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99 |
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100 | /**
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101 | * Add to the current encoder all properties contained in the given HTML
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102 | * form. There is no index for the current file: all the form parameters are
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103 | * global parameters (index will be set to -1 when calling
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104 | * {@link #appendTextProperty(String, String, int)}.
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105 | *
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106 | * @param formname The HTML form name. This method will get the data from
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107 | * this form, by using the {@link JUploadContext#getApplet()}
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108 | * method.
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109 | * @return Return the current ByteArrayEncoder, to allow chained call (see
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110 | * explanation, here above).
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111 | * @throws JUploadIOException
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112 | */
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113 | public ByteArrayEncoder appendFormVariables(String formname)
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114 | throws JUploadIOException;
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115 |
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116 | /**
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117 | * Append a string, to be encoded at the current end of the byte array.
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118 | *
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119 | * @param bae The ByteArrayEncoder whose encoding result should be appended
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120 | * to the current encoder. bae must be closed, before being
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121 | * appended.
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122 | * @return Return the current ByteArrayEncoder, to allow chained call (see
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123 | * explanation, here above).
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124 | * @throws JUploadIOException This exception is thrown when this method is
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125 | * called on a non-closed encoder.
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126 | */
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127 | public ByteArrayEncoder append(ByteArrayEncoder bae)
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128 | throws JUploadIOException;
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129 |
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130 | /**
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131 | * @return the closed
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132 | */
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133 | public boolean isClosed();
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134 |
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135 | /**
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136 | * Gets the HTTP boundary, that separate the form variables.
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137 | *
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138 | * @return The HTTP boundary, that was generated when the instance was
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139 | * created.
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140 | */
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141 | public String getBoundary();
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142 |
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143 | /**
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144 | * @return the encoding
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145 | */
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146 | public String getEncoding();
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147 |
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148 | /**
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149 | * Get the length of the encoded result. Can be called only once the encoder
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150 | * has been closed.
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151 | *
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152 | * @return the encodedLength
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153 | * @throws JUploadIOException This exception is thrown when this method is
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154 | * called on a non-closed encoder.
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155 | */
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156 | public int getEncodedLength() throws JUploadIOException;
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157 |
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158 | /**
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159 | * Get the encoded result. Can be called only once the encoder has been
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160 | * closed.
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161 | *
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162 | * @return the encodedByteArray
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163 | * @throws JUploadIOException This exception is thrown when this method is
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164 | * called on a non-closed encoder.
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165 | */
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166 | public byte[] getEncodedByteArray() throws JUploadIOException;
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167 |
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168 | /**
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169 | * Get the String that matches the encoded result. Can be called only once
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170 | * the encoder has been closed.
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171 | *
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172 | * @return the String that has been encoded.
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173 | * @throws JUploadIOException This exception is thrown when this method is
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174 | * called on a non-closed encoder.
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175 | */
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176 | public String getString() throws JUploadIOException;
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177 |
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178 | } |
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