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annotate src/main/java/nl/cwi/monetdb/mcl/io/BufferedMCLReader.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 e605cdd6373f b9b35ca2eec2
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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.io;
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10
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11 import java.io.BufferedReader;
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12 import java.io.IOException;
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13 import java.io.InputStream;
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14 import java.io.InputStreamReader;
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15 import java.io.Reader;
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16 import java.io.UnsupportedEncodingException;
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17
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18 /**
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19 * Read text from a character-input stream, buffering characters so as
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20 * to provide a means for efficient reading of characters, arrays and
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21 * lines. This class is based on the BufferedReader class, and provides
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22 * extra functionality useful for MCL.
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23 *
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24 * The BufferedMCLReader is typically used as layer inbetween an
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25 * InputStream and a specific interpreter of the data.
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26 * <pre>
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27 * / Response
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28 * BufferedMCLReader ---o &lt;- Tuple
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29 * \ DataBlock
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30 * </pre>
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31 * Because the BufferedMCLReader provides an efficient way to access the
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32 * data from the stream in a linewise fashion, whereby each line is
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33 * identified as a certain type, consumers can easily decide how to
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34 * parse each retrieved line. The line parsers from
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35 * nl.cwi.monetdb.mcl.parser are well suited to work with the lines
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36 * outputted by the BufferedMCLReader.
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37 * This class is client-oriented, as it doesn't take into account the
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38 * messages as the server receives them.
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39 *
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40 * @author Fabian Groffen <Fabian.Groffen>
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41 * @see nl.cwi.monetdb.mcl.net.MapiSocket
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42 * @see nl.cwi.monetdb.mcl.io.BufferedMCLWriter
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43 */
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44 public class BufferedMCLReader extends BufferedReader {
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45 /** The type of the last line read */
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46 private int lineType;
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47
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48 /** "there is currently no line", or the the type is unknown is
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49 represented by UNKNOWN */
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50 public final static int UNKNOWN = 0;
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51 /** a line starting with ! indicates ERROR */
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52 public final static int ERROR = '!';
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53 /** a line starting with % indicates HEADER */
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54 public final static int HEADER = '%';
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55 /** a line starting with [ indicates RESULT */
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56 public final static int RESULT = '[';
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57 /** a line which matches the pattern of prompt1 is a PROMPT */
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58 public final static int PROMPT = '.';
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59 /** a line which matches the pattern of prompt2 is a MORE */
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60 public final static int MORE = ',';
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61 /** a line starting with &amp; indicates the start of a header block */
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62 public final static int SOHEADER = '&';
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63 /** a line starting with ^ indicates REDIRECT */
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64 public final static int REDIRECT = '^';
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65 /** a line starting with # indicates INFO */
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66 public final static int INFO = '#';
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67
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68 /**
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69 * Create a buffering character-input stream that uses a
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70 * default-sized input buffer.
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71 *
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72 * @param in A Reader
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73 */
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74 public BufferedMCLReader(Reader in) {
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75 super(in);
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76 }
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77
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78 /**
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79 * Create a buffering character-input stream that uses a
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80 * default-sized input buffer, from an InputStream.
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81 *
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82 * @param in An InputStream
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83 * @param enc Encoding
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84 */
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85 public BufferedMCLReader(InputStream in, String enc)
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86 throws UnsupportedEncodingException
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87 {
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88 super(new InputStreamReader(in, enc));
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89 }
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90
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91 /**
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92 * Read a line of text. A line is considered to be terminated by
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93 * any one of a line feed ('\n'), a carriage return ('\r'), or a
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94 * carriage return followed immediately by a linefeed. Before this
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95 * method returns, it sets the linetype to any of the in MCL
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96 * recognised line types.
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97 *
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98 * Warning: until the server properly prefixes all of its error
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99 * messages with SQLSTATE codes, this method prefixes all errors it
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100 * sees without sqlstate with the generic data exception code
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101 * (22000).
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102 *
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103 * @return A String containing the contents of the line, not
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104 * including any line-termination characters, or null if the
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105 * end of the stream has been reached
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106 * @throws IOException If an I/O error occurs
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107 */
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108 @Override
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109 public String readLine() throws IOException {
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110 String r = super.readLine();
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111 setLineType(r);
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112 if (lineType == ERROR && !r.matches("^![0-9A-Z]{5}!.+"))
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113 r = "!22000!" + r.substring(1);
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114 return r;
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115 }
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116
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117 /**
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118 * Sets the linetype to the type of the string given. If the string
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119 * is null, lineType is set to UNKNOWN.
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120 *
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121 * @param line the string to examine
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122 */
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123 void setLineType(String line) {
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124 lineType = UNKNOWN;
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125 if (line == null || line.length() == 0)
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126 return;
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127 switch (line.charAt(0)) {
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128 case '!':
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129 lineType = ERROR;
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130 break;
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131 case '&':
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132 lineType = SOHEADER;
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133 break;
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134 case '%':
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135 lineType = HEADER;
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136 break;
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137 case '[':
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138 lineType = RESULT;
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139 break;
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140 case '=':
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141 lineType = RESULT;
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142 break;
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143 case '^':
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144 lineType = REDIRECT;
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145 break;
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146 case '#':
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147 lineType = INFO;
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148 break;
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149 case '.':
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150 lineType = PROMPT;
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151 break;
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152 case ',':
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153 lineType = MORE;
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154 break;
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155 }
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156 }
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157
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158 /**
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159 * getLineType returns the type of the last line read.
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160 *
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161 * @return an integer representing the kind of line this is, one of the
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162 * following constants: UNKNOWN, HEADER, ERROR, PROMPT,
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163 * RESULT, REDIRECT, INFO
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164 */
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165 public int getLineType() {
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166 return lineType;
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167 }
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168
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169 /**
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170 * Reads up till the MonetDB prompt, indicating the server is ready
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171 * for a new command. All read data is discarded. If the last line
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172 * read by readLine() was a prompt, this method will immediately
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173 * return.
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174 *
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175 * If there are errors present in the lines that are read, then they
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176 * are put in one string and returned <b>after</b> the prompt has
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177 * been found. If no errors are present, null will be returned.
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178 *
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179 * @return a string containing error messages, or null if there aren't any
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180 * @throws IOException if an IO exception occurs while talking to the server
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181 *
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182 * TODO(Wouter): should probably not have to be synchronized. + StringBuilder...
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183 */
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184 final public synchronized String waitForPrompt() throws IOException {
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185 String ret = "", tmp;
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186 while (lineType != PROMPT) {
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187 if ((tmp = readLine()) == null)
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188 throw new IOException("Connection to server lost!");
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189 if (lineType == ERROR)
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190 ret += "\n" + tmp.substring(1);
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191 }
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192 return ret == "" ? null : ret.trim();
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193 }
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194
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195 }