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annotate src/main/java/nl/cwi/monetdb/mcl/parser/StartOfHeaderParser.java @ 357:f8f1617c2fb3

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Updated comment (replaced sql/include/sql_querytype.h with sql/include/sql_querytype.h) Removed public final static int Q_UNKNOWN as it is not used nor defined in sql_querytype.h Disbled public final boolean hasNext() as it is never called, nor needed
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Wed, 04 Mar 2020 19:14:14 +0100 (2020-03-04)
parents 54137aeb1f92
children 8a813f5cef1b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 - 2020 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 final 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/include/sql_querytype.h) */
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31 /** A parse response (not handled) */
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32 public final static int Q_PARSE = '0';
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33 /** A tabular response (typical ResultSet) */
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34 public final static int Q_TABLE = '1';
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35 /** A response to an update statement, contains number of affected
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36 * rows and generated key-id */
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37 public final static int Q_UPDATE = '2';
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38 /** A response to a schema update */
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39 public final static int Q_SCHEMA = '3';
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40 /** A response to a transation statement (start, rollback, abort,
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41 * commit) */
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42 public final static int Q_TRANS = '4';
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43 /** A tabular response in response to a PREPARE statement containing
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44 * information about the wildcard values that need to be supplied */
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45 public final static int Q_PREPARE = '5';
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46 /** A tabular continuation response (for a ResultSet) */
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47 public final static int Q_BLOCK = '6';
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49
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50 public final int parse(final String in) throws MCLParseException {
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51 soh = CharBuffer.wrap(in);
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52 soh.get(); // skip the &
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53 final int type = soh.get();
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54 switch (type) {
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55 case Q_PARSE:
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56 case Q_SCHEMA:
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57 len = 0;
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58 break;
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59 case Q_TABLE:
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60 case Q_PREPARE:
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61 len = 4;
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62 soh.get();
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63 break;
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64 case Q_UPDATE:
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65 len = 2;
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66 soh.get();
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67 break;
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68 case Q_TRANS:
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69 len = 1;
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70 soh.get();
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71 break;
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72 case Q_BLOCK:
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73 len = 3;
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74 soh.get();
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75 break;
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76 default:
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77 throw new MCLParseException("invalid or unknown header", 1);
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78 }
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79 pos = 0;
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80 return type;
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81 }
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82
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83 /* MvD: disabled hasNext() method as it is never called.
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84 public final boolean hasNext() {
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85 return pos < len;
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86 }
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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 pos++;
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100 if (!soh.hasRemaining())
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101 throw new MCLParseException("unexpected end of string", soh.position() - 1);
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102
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103 boolean positive = true;
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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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114 int tmp = 0;
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115 if (chr >= '0' && chr <= '9') {
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116 tmp = (int)chr - (int)'0';
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117 } else {
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118 throw new MCLParseException("expected a digit", soh.position() - 1);
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119 }
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121 while (soh.hasRemaining() && (chr = soh.get()) != ' ') {
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122 if (chr >= '0' && chr <= '9') {
180
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123 tmp *= 10;
0
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124 tmp += (int)chr - (int)'0';
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125 } else {
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126 throw new MCLParseException("expected a digit", soh.position() - 1);
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127 }
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128 }
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129
116
04c535b05c52 Fixed negative number parsing on the StartOfHeaderParser
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
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130 return positive ? tmp : -tmp;
0
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131 }
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132
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133 public final String getNextAsString() throws MCLParseException {
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134 pos++;
180
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Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
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135 if (!soh.hasRemaining())
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136 throw new MCLParseException("unexpected end of string", soh.position() - 1);
297
bb273e9c7e09 Add "final" keyword to classes, method arguments and local variables where possible.
Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
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137
0
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138 int cnt = 0;
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139 soh.mark();
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140 while (soh.hasRemaining() && soh.get() != ' ') {
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141 cnt++;
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142 }
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143 soh.reset();
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144
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Sjoerd Mullender <sjoerd@acm.org>
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145 return soh.subSequence(0, cnt).toString();
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146 }
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147 }