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annotate src/main/java/nl/cwi/monetdb/mcl/parser/HeaderLineParser.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)
parents
children e67d58485172 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
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12 /**
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13 * The HeaderLineParser is a generic MCLParser that extracts values from
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14 * a metadata header in the MCL protocol either as string or integer
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15 * values.
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16 *
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17 * @author Fabian Groffen <Fabian.Groffen>
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18 */
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19 public class HeaderLineParser extends MCLParser {
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20 private int type;
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21
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22 public final static int NAME = 1;
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23 public final static int LENGTH = 2;
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24 public final static int TABLE = 3;
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25 public final static int TYPE = 4;
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26
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27 /**
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28 * Constructs a HeaderLineParser which expects columncount columns.
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29 *
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30 * @param columncount the number of columns in the to be parsed string
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31 */
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32 public HeaderLineParser(int columncount) {
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33 super(columncount);
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34 }
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35
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36 /**
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37 * Parses the given String source as header line. If source cannot
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38 * be parsed, an MCLParseException is thrown. The columncount argument
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39 * given during construction is used for allocation of the backing
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40 * array. Parsing a header line with has more fields will therefore
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41 * result in a crash. While this seems illogical, the caller should
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42 * know this size, since the StartOfHeader contains this
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43 * information.
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44 *
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45 * @param source a String which should be parsed
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46 * @return the type of then parsed header line
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47 * @throws MCLParseException if an error occurs during parsing
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48 */
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49 @Override
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50 public int parse(String source) throws MCLParseException {
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51 char[] chrLine = source.toCharArray();
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52 int len = chrLine.length;
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53 int pos = 0;
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54 boolean foundChar = false;
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55 boolean nameFound = false;
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56 // find header name
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57 for (int i = len - 1; i >= 0; i--) {
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58 switch (chrLine[i]) {
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59 case ' ':
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60 case '\n':
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61 case '\t':
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62 case '\r':
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63 if (!foundChar) {
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64 len = i - 1;
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65 } else {
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66 pos = i + 1;
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67 }
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68 break;
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69 case '#':
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70 // found!
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71 nameFound = true;
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72 if (pos == 0) pos = i + 1;
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73 i = 0; // force the loop to terminate
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74 break;
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75 default:
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76 foundChar = true;
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77 pos = 0;
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78 break;
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79 }
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80 }
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81 if (!nameFound)
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82 throw new MCLParseException("invalid header, no header name found", pos);
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83
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84 // depending on the name of the header, we continue
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85 switch (chrLine[pos]) {
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86 case 'n':
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87 if (len - pos == 4 &&
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88 source.regionMatches(pos + 1, "name", 1, 3))
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89 {
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90 getValues(chrLine, 2, pos - 3);
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91 type = NAME;
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92 }
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93 break;
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94 case 'l':
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95 if (len - pos == 6 &&
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96 source.regionMatches(pos + 1, "length", 1, 5))
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97 {
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98 getIntValues(chrLine, 2, pos - 3);
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99 type = LENGTH;
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100 }
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101 break;
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102 case 't':
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103 if (len - pos == 4 &&
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104 source.regionMatches(pos + 1, "type", 1, 3))
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105 {
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106 getValues(chrLine, 2, pos - 3);
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107 type = TYPE;
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108 } else if (len - pos == 10 &&
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109 source.regionMatches(pos + 1, "table_name", 1, 9))
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110 {
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111 getValues(chrLine, 2, pos - 3);
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112 type = TABLE;
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113 }
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114 break;
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115 default:
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116 throw new MCLParseException("unknown header: " +
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117 (new String(chrLine, pos, len - pos)));
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118 }
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119
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120 // adjust colno
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121 reset();
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122
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123 return type;
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124 }
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125
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126 /**
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127 * Returns an array of Strings containing the values between
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128 * ',\t' separators. Note that no quoting/dequoting is done in this
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129 * method.
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130 *
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131 * @param chrLine a character array holding the input data
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132 * @param start where the relevant data starts
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133 * @param stop where the relevant data stops
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134 */
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135 final private void getValues(char[] chrLine, int start, int stop) {
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136 int elem = 0;
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137
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138 for (int i = start + 1; i < stop; i++) {
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139 if (chrLine[i] == '\t' && chrLine[i - 1] == ',') {
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140 values[elem++] =
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141 new String(chrLine, start, i - 1 - start);
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142 start = i + 1;
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143 }
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144 }
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145 // add the left over part
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146 values[elem++] = new String(chrLine, start, stop - start);
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147 }
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148
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149 /**
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150 * Returns an array of ints containing the values between
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151 * ',\t' separators.
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152 *
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153 * @param chrLine a character array holding the input data
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154 * @param start where the relevant data starts
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155 * @param stop where the relevant data stops
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156 */
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157 final private void getIntValues(char[] chrLine, int start, int stop)
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158 throws MCLParseException
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159 {
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160 int elem = 0;
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161 int tmp = 0;
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162
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163 for (int i = start; i < stop; i++) {
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164 if (chrLine[i] == ',' && chrLine[i + 1] == '\t') {
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165 intValues[elem++] = tmp;
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166 tmp = 0;
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167 start = i++;
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168 } else {
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169 tmp *= 10;
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170 // note: don't use Character.isDigit() here, because
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171 // we only want ISO-LATIN-1 digits
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172 if (chrLine[i] >= '0' && chrLine[i] <= '9') {
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173 tmp += (int)chrLine[i] - (int)'0';
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174 } else {
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175 throw new MCLParseException("expected a digit in " + new String(chrLine) + " at " + i);
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176 }
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177 }
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178 }
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179 // add the left over part
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180 intValues[elem++] = tmp;
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181 }
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182 }