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annotate src/main/java/nl/cwi/monetdb/mcl/parser/StartOfHeaderParser.java @ 0:a5a898f6886c

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Copy of MonetDB java directory changeset e6e32756ad31.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 21 Sep 2016 09:34:48 +0200 (2016-09-21)
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children b66003555560 b9b35ca2eec2
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0
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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 - 2016 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 <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 default:
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58 throw new MCLParseException("invalid or unknown header", 1);
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59 case Q_PARSE:
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60 case Q_SCHEMA:
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61 len = 0;
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62 break;
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63 case Q_TABLE:
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64 case Q_PREPARE:
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65 len = 4;
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66 soh.get();
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67 break;
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68 case Q_UPDATE:
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69 len = 2;
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70 soh.get();
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71 break;
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72 case Q_TRANS:
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73 len = 1;
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74 soh.get();
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75 break;
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76 case Q_BLOCK:
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77 len = 3;
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78 soh.get();
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79 break;
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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 pos++;
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100 if (!soh.hasRemaining()) throw
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101 new MCLParseException("unexpected end of string", soh.position() - 1);
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102 int tmp;
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103 char chr = soh.get();
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104 // note: don't use Character.isDigit() here, because
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105 // we only want ISO-LATIN-1 digits
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106 if (chr >= '0' && chr <= '9') {
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107 tmp = (int)chr - (int)'0';
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108 } else {
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109 throw new MCLParseException("expected a digit", soh.position() - 1);
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110 }
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111
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112 while (soh.hasRemaining() && (chr = soh.get()) != ' ') {
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113 tmp *= 10;
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114 if (chr >= '0' && chr <= '9') {
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115 tmp += (int)chr - (int)'0';
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116 } else {
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117 throw new MCLParseException("expected a digit", soh.position() - 1);
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118 }
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119 }
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120
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121 return tmp;
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122 }
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123
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124 public final String getNextAsString() throws MCLParseException {
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125 pos++;
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126 if (!soh.hasRemaining()) throw
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127 new MCLParseException("unexpected end of string", soh.position() - 1);
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128 int cnt = 0;
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129 soh.mark();
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130 while (soh.hasRemaining() && soh.get() != ' ') {
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131 cnt++;
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132 }
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133
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134 soh.reset();
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135
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136 return soh.subSequence(0, cnt).toString();
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137 }
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138 }