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annotate src/main/java/org/monetdb/mcl/io/BufferedMCLReader.java @ 542:d462000fc410 onclient

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Various changes suggested by Martin van Dinther
author Joeri van Ruth <joeri.van.ruth@monetdbsolutions.com>
date Thu, 02 Sep 2021 15:13:46 +0200 (2021-09-02)
parents 4cfe4991ee63
children 50b15ee1cb5e
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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 - 2021 MonetDB B.V.
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7 */
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8
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9 package org.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.Reader;
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15 import java.io.UnsupportedEncodingException;
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16
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17 import static org.monetdb.mcl.io.LineType.ERROR;
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18 import static org.monetdb.mcl.io.LineType.PROMPT;
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19 import static org.monetdb.mcl.io.LineType.UNKNOWN;
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20
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21 /**
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22 * Read text from a character-input stream, buffering characters so as
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23 * to provide a means for efficient reading of characters, arrays and
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24 * lines. This class is based on the BufferedReader class, and provides
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25 * extra functionality useful for MCL.
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26 *
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27 * The BufferedMCLReader is typically used as layer inbetween an
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28 * InputStream and a specific interpreter of the data.
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29 * <pre>
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30 * / Response
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31 * BufferedMCLReader ---o &lt;- Tuple
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32 * \ DataBlock
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33 * </pre>
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34 * Because the BufferedMCLReader provides an efficient way to access the
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35 * data from the stream in a linewise fashion, whereby each line is
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36 * identified as a certain type, consumers can easily decide how to
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37 * parse each retrieved line. The line parsers from
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38 * org.monetdb.mcl.parser are well suited to work with the lines
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39 * outputted by the BufferedMCLReader.
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40 * This class is client-oriented, as it doesn't take into account the
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41 * messages as the server receives them.
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42 *
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43 * @author Fabian Groffen
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44 * @see org.monetdb.mcl.net.MapiSocket
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45 * @see org.monetdb.mcl.io.BufferedMCLWriter
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46 */
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47 public final class BufferedMCLReader extends BufferedReader {
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48
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49 /** The type of the last line read */
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50 private LineType lineType = UNKNOWN;
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51
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52 /**
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53 * Create a buffering character-input stream that uses a
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54 * default-sized input buffer.
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55 *
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56 * @param in A Reader
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57 */
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58 public BufferedMCLReader(final Reader in) {
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59 super(in);
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60 }
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61
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62 /**
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63 * Create a buffering character-input stream that uses a
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64 * default-sized input buffer, from an InputStream.
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65 *
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66 * @param in An InputStream
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67 * @param enc Encoding
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68 * @throws UnsupportedEncodingException If encoding is not supported
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69 */
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70 public BufferedMCLReader(final InputStream in, final String enc)
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71 throws UnsupportedEncodingException
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72 {
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73 super(new java.io.InputStreamReader(in, enc));
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74 }
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75
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76 /**
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77 * Read a line of text. A line is considered to be terminated by
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78 * any one of a line feed ('\n'), a carriage return ('\r'), or a
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79 * carriage return followed immediately by a linefeed. Before this
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80 * method returns, it sets the linetype to any of the in MCL
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81 * recognised line types.
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82 *
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83 * Warning: until the server properly prefixes all of its error
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84 * messages with SQLSTATE codes, this method prefixes all errors it
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85 * sees without sqlstate with the generic data exception code (22000).
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86 *
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87 * @return A String containing the contents of the line, not
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88 * including any line-termination characters, or null if the
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89 * end of the stream has been reached
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90 * @throws IOException If an I/O error occurs
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91 */
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92 @Override
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93 public String readLine() throws IOException {
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94 String r = super.readLine();
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95 setLineType(r);
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96 if (lineType == ERROR && r != null && !r.matches("^![0-9A-Z]{5}!.+")) {
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97 r = "!22000!" + r.substring(1);
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98 }
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99 return r;
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100 }
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101
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102 /**
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103 * Sets the linetype to the type of the string given. If the string
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104 * is null, lineType is set to UNKNOWN.
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105 *
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106 * @param line the string to examine
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107 */
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108 public void setLineType(final String line) {
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109 lineType = LineType.classify(line);
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110 }
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111
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112 /**
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113 * getLineType returns the type of the last line read.
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114 *
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115 * @return an integer representing the kind of line this is, one of the
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116 * following constants: UNKNOWN, HEADER, ERROR, PROMPT, MORE,
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117 * RESULT, SOHEADER, REDIRECT, INFO
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118 */
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119 public LineType getLineType() {
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120 return lineType;
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121 }
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122
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123 /**
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124 * Reads up till the MonetDB prompt, indicating the server is ready
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125 * for a new command. All read data is discarded. If the last line
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126 * read by readLine() was a prompt, this method will immediately return.
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127 *
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128 * If there are errors present in the lines that are read, then they
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129 * are put in one string and returned <b>after</b> the prompt has
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130 * been found. If no errors are present, null will be returned.
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131 *
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132 * @return a string containing error messages, or null if there aren't any
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133 * @throws IOException if an IO exception occurs while talking to the server
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134 *
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135 * TODO(Wouter): should probably not have to be synchronized.
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136 */
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137 final public synchronized String waitForPrompt() throws IOException {
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138 final StringBuilder ret = new StringBuilder(128);
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139 String tmp;
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140
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141 while (lineType != PROMPT) {
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142 tmp = readLine();
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143 if (tmp == null)
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144 throw new IOException("Connection to server lost!");
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145 if (lineType == ERROR)
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146 ret.append('\n').append(tmp.substring(1));
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147 }
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148 return ret.length() == 0 ? null : ret.toString().trim();
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149 }
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150 }