annotate src/main/java/nl/cwi/monetdb/mcl/parser/HeaderLineParser.java @ 116:04c535b05c52

Fixed negative number parsing on the StartOfHeaderParser
author Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
date Thu, 16 Feb 2017 11:07:55 +0100 (2017-02-16)
parents 839ffec1d36d
children a030c3e53cf5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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 *
90
b9b35ca2eec2 Updated copyright year to 2017 in *.java files and MonetDriver.java.in and build.xml and version.sh
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2017 MonetDB B.V.
0
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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
104
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128 * ',\t' separators.
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129 * As of Oct2014-SP1 release MAPI adds double quotes around names when
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130 * the name contains a comma or a tab or a space or a # or " character.
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131 * See issue: https://www.monetdb.org/bugzilla/show_bug.cgi?id=3616
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132 * If the parsed name string part has a " as first and last character,
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133 * we remove those added double quotes here.
0
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134 *
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135 * @param chrLine a character array holding the input data
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136 * @param start where the relevant data starts
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137 * @param stop where the relevant data stops
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138 */
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139 final private void getValues(char[] chrLine, int start, int stop) {
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140 int elem = 0;
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141
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142 for (int i = start + 1; i < stop; i++) {
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143 if (chrLine[i] == '\t' && chrLine[i - 1] == ',') {
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144 if (chrLine[start] == '"')
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145 start++; // skip leading double quote
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146 values[elem++] = new String(chrLine, start, i - (chrLine[i - 2] == '"' ? 2 : 1) - start);
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147 start = i + 1;
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148 }
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149 }
104
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150 // add the left over part (last column)
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151 if (chrLine[start] == '"')
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152 start++; // skip leading double quote
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153 values[elem++] = new String(chrLine, start, stop - (chrLine[stop - 1] == '"' ? 1 : 0) - start);
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154 }
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155
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156 /**
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157 * Returns an array of ints containing the values between
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158 * ',\t' separators.
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159 *
116
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160 * Feb2017 note - This integer parser doesn't have to parse negative
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161 * numbers, because it is only used to parse column lengths
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162 * which is always greater than 0.
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163 *
0
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164 * @param chrLine a character array holding the input data
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165 * @param start where the relevant data starts
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166 * @param stop where the relevant data stops
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167 */
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168 final private void getIntValues(char[] chrLine, int start, int stop)
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169 throws MCLParseException
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170 {
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171 int elem = 0;
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172 int tmp = 0;
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173
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174 for (int i = start; i < stop; i++) {
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175 if (chrLine[i] == ',' && chrLine[i + 1] == '\t') {
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176 intValues[elem++] = tmp;
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177 tmp = 0;
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178 } else {
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179 tmp *= 10;
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180 // note: don't use Character.isDigit() here, because
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181 // we only want ISO-LATIN-1 digits
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182 if (chrLine[i] >= '0' && chrLine[i] <= '9') {
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183 tmp += (int)chrLine[i] - (int)'0';
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184 } else {
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185 throw new MCLParseException("expected a digit in " + new String(chrLine) + " at " + i);
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186 }
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187 }
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188 }
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189 // add the left over part
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190 intValues[elem++] = tmp;
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191 }
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192 }