Mercurial > hg > monetdb-java
annotate src/main/java/nl/cwi/monetdb/mcl/parser/StartOfHeaderParser.java @ 261:d4baf8a4b43a
Update Copyright year to 2019
author | Martin van Dinther <martin.van.dinther@monetdbsolutions.com> |
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date | Thu, 03 Jan 2019 14:43:44 +0100 (2019-01-03) |
parents | c38d4eaf5479 |
children | bb273e9c7e09 |
rev | line source |
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1 /* |
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2 * This Source Code Form is subject to the terms of the Mozilla Public |
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this |
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. |
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5 * |
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2019 MonetDB B.V. |
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7 */ |
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8 |
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9 package nl.cwi.monetdb.mcl.parser; |
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10 |
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11 import java.nio.CharBuffer; |
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12 |
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13 /** |
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14 * The StartOfHeaderParser allows easy examination of a start of header |
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15 * line. It does not fit into the general MCLParser framework because |
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16 * it uses a different interface. While the parser is very shallow, it |
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17 * requires the caller to know about the header lines that are parsed. |
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18 * All this parser does is detect the (valid) type of a soheader, and |
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19 * allow to return the fields in it as integer or string. An extra |
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20 * bonus is that it can return if another field should be present in the |
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21 * soheader. |
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22 * |
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23 * @author Fabian Groffen |
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24 */ |
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25 public class StartOfHeaderParser { |
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26 private CharBuffer soh = null; |
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27 private int len; |
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28 private int pos; |
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29 |
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30 /* Query types (copied from sql_query.mx) */ |
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31 |
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32 /** A parse response (not handled) */ |
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33 public final static int Q_PARSE = '0'; |
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34 /** A tabular response (typical ResultSet) */ |
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35 public final static int Q_TABLE = '1'; |
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36 /** A response to an update statement, contains number of affected |
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37 * rows and generated key-id */ |
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38 public final static int Q_UPDATE = '2'; |
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39 /** A response to a schema update */ |
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40 public final static int Q_SCHEMA = '3'; |
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41 /** A response to a transation statement (start, rollback, abort, |
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42 * commit) */ |
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43 public final static int Q_TRANS = '4'; |
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44 /** A tabular response in response to a PREPARE statement containing |
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45 * information about the wildcard values that need to be supplied */ |
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46 public final static int Q_PREPARE = '5'; |
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47 /** A tabular continuation response (for a ResultSet) */ |
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48 public final static int Q_BLOCK = '6'; |
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49 /** An unknown and unsupported response */ |
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50 public final static int Q_UNKNOWN = 0 ; |
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51 |
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52 public final int parse(String in) throws MCLParseException { |
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53 soh = CharBuffer.wrap(in); |
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54 soh.get(); // skip the & |
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55 int type = soh.get(); |
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56 switch (type) { |
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57 case Q_PARSE: |
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58 case Q_SCHEMA: |
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59 len = 0; |
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60 break; |
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61 case Q_TABLE: |
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62 case Q_PREPARE: |
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63 len = 4; |
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64 soh.get(); |
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65 break; |
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66 case Q_UPDATE: |
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67 len = 2; |
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68 soh.get(); |
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69 break; |
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70 case Q_TRANS: |
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71 len = 1; |
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72 soh.get(); |
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73 break; |
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74 case Q_BLOCK: |
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75 len = 3; |
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76 soh.get(); |
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77 break; |
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78 default: |
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79 throw new MCLParseException("invalid or unknown header", 1); |
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80 } |
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81 pos = 0; |
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82 return type; |
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83 } |
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84 |
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85 public final boolean hasNext() { |
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86 return pos < len; |
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87 } |
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88 |
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89 /** |
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90 * Returns the next token in the CharBuffer as integer. The value is |
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91 * considered to end at the end of the CharBuffer or at a space. If |
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92 * a non-numeric character is encountered an MCLParseException is |
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93 * thrown. |
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94 * |
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95 * @return The next token in the CharBuffer as integer |
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96 * @throws MCLParseException if no numeric value could be read |
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97 */ |
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98 public final int getNextAsInt() throws MCLParseException { |
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99 boolean positive = true; |
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100 pos++; |
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101 if (!soh.hasRemaining()) |
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102 throw new MCLParseException("unexpected end of string", soh.position() - 1); |
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103 int tmp = 0; |
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104 char chr = soh.get(); |
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105 // note: don't use Character.isDigit() here, because |
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106 // we only want ISO-LATIN-1 digits |
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107 if(chr == '-') { |
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108 positive = false; |
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109 if (!soh.hasRemaining()) |
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110 throw new MCLParseException("unexpected end of string", soh.position() - 1); |
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111 chr = soh.get(); |
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112 } |
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113 if (chr >= '0' && chr <= '9') { |
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114 tmp = (int)chr - (int)'0'; |
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115 } else { |
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116 throw new MCLParseException("expected a digit", soh.position() - 1); |
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117 } |
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118 |
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119 while (soh.hasRemaining() && (chr = soh.get()) != ' ') { |
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120 if (chr >= '0' && chr <= '9') { |
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121 tmp *= 10; |
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122 tmp += (int)chr - (int)'0'; |
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123 } else { |
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124 throw new MCLParseException("expected a digit", soh.position() - 1); |
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125 } |
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126 } |
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127 |
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128 return positive ? tmp : -tmp; |
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129 } |
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130 |
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131 public final String getNextAsString() throws MCLParseException { |
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132 pos++; |
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133 if (!soh.hasRemaining()) |
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134 throw new MCLParseException("unexpected end of string", soh.position() - 1); |
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135 int cnt = 0; |
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136 soh.mark(); |
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137 while (soh.hasRemaining() && soh.get() != ' ') { |
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138 cnt++; |
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139 } |
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140 |
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141 soh.reset(); |
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142 |
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143 return soh.subSequence(0, cnt).toString(); |
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144 } |
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145 } |