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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetClob.java @ 149:1e49fc74dba4

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Implemented methods getCharacterStream() and getCharacterStream(long pos, long length) in class MonetClob. Method getCharacterStream() is called by DBeaver to fetch the Clob value. It used to throw a SQLFeatureNotSupportedException with message: "Method getCharacterStream() currently not supported" This caused DBeaver to log the exception and show NULL as the value on screen, which is incorrect. By implementing these methods it now works as expected for DBeaver and other generic SQL client tools using JDBC.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 17 Aug 2017 18:36:25 +0200 (2017-08-17)
parents ad0fe5b04fd4
children 60063c67f9e7 c38d4eaf5479
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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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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.
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7 */
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8
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9 package nl.cwi.monetdb.jdbc;
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11 import java.io.InputStream;
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12 import java.io.OutputStream;
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13 import java.io.Reader;
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14 import java.io.StringReader;
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15 import java.io.Writer;
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16 import java.sql.Clob;
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17 import java.sql.SQLException;
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18 import java.sql.SQLFeatureNotSupportedException;
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20 /**
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21 * The MonetClob class implements the {@link java.sql.Clob} interface. Because
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22 * MonetDB/SQL currently has no support for streams, this class is a
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23 * shallow wrapper of a {@link StringBuilder}. It is more or less supplied to
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24 * enable an application that depends on it to run. It may be obvious
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25 * that it is a real resource expensive workaround that contradicts the
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26 * sole reason for a Clob: avoidance of huge resource consumption.
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27 * <b>Use of this class is highly discouraged.</b>
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28 *
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29 * @author Fabian Groffen
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30 */
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31 public class MonetClob implements Clob {
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32
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33 private StringBuilder buf;
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34
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35 protected MonetClob(String in) {
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36 buf = new StringBuilder(in);
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37 }
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39 /* internal utility method */
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40 private void checkBufIsNotNull() throws SQLException {
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41 if (buf == null)
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42 throw new SQLException("This MonetClob has been freed", "M1M20");
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43 }
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44
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45 //== begin interface Clob
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46
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47 /**
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48 * This method frees the Clob object and releases the resources the
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49 * resources that it holds. The object is invalid once the free
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50 * method is called.
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51 *
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52 * After free has been called, any attempt to invoke a method other
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53 * than free will result in a SQLException being thrown. If free is
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54 * called multiple times, the subsequent calls to free are treated
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55 * as a no-op.
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56 */
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57 @Override
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58 public void free() {
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59 buf = null;
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60 }
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61
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62 /**
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63 * Retrieves the CLOB value designated by this Clob object as an
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64 * ascii stream.
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65 *
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66 * @return a java.io.InputStream object containing the CLOB data
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67 * @throws SQLFeatureNotSupportedException this JDBC driver does
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68 * not support this method
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69 */
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70 @Override
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71 public InputStream getAsciiStream() throws SQLException {
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72 throw new SQLFeatureNotSupportedException("Method getAsciiStream() not supported", "0A000");
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73 }
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74
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75 /**
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76 * Retrieves the CLOB value designated by this Clob object as a
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77 * java.io.Reader object (or as a stream of characters).
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78 *
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79 * @return a java.io.Reader object containing the CLOB data
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80 * @throws SQLFeatureNotSupportedException this JDBC driver does
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81 * not support this method
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82 */
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83 @Override
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84 public Reader getCharacterStream() throws SQLException {
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85 checkBufIsNotNull();
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86 return new StringReader(buf.toString());
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87 }
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88
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89 /**
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90 * Returns a Reader object that contains a partial Clob value,
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91 * starting with the character specified by pos, which is length
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92 * characters in length.
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93 *
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94 * @param pos the offset to the first character of the partial value
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95 * to be retrieved. The first character in the Clob is at
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96 * position 1.
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97 * @param length the length in characters of the partial value to be
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98 * retrieved.
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99 * @return Reader through which the partial Clob value can be read.
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100 * @throws SQLFeatureNotSupportedException this JDBC driver does
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101 * not support this method
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102 */
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103 @Override
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104 public Reader getCharacterStream(long pos, long length) throws SQLException {
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105 checkBufIsNotNull();
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106 return new StringReader(getSubString(pos, (int)length));
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107 }
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108
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109 /**
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110 * Retrieves a copy of the specified substring in the CLOB value
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111 * designated by this Clob object. The substring begins at
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112 * position pos and has up to length consecutive characters.
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113 *
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114 * @param pos the first character of the substring to be
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115 * extracted. The first character is at position 1.
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116 * @param length the number of consecutive characters to be copied
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117 * @return a String that is the specified substring in the
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118 * CLOB value designated by this Clob object
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119 * @throws SQLException if there is an error accessing the
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120 * CLOB value
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121 */
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122 @Override
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123 public String getSubString(long pos, int length) throws SQLException {
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124 checkBufIsNotNull();
0
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125 try {
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126 return buf.substring((int)(pos - 1), (int)(pos - 1 + length));
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127 } catch (IndexOutOfBoundsException e) {
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128 throw new SQLException(e.getMessage());
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129 }
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130 }
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131
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132 /**
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133 * Retrieves the number of characters in the CLOB value designated
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134 * by this Clob object.
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135 *
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136 * @return length of the CLOB in characters
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137 * @throws SQLException if there is an error accessing the length
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138 * of the CLOB value
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139 */
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140 @Override
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141 public long length() throws SQLException {
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142 checkBufIsNotNull();
0
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143 return (long)buf.length();
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144 }
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145
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146 /**
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147 * Retrieves the character position at which the specified Clob
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148 * object searchstr appears in this Clob object. The search
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149 * begins at position start.
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150 *
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151 * @param searchstr the Clob object for which to search
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152 * @param start the position at which to begin searching;
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153 * the first position is 1
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154 * @return the position at which the Clob object appears or
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155 * -1 if it is not present; the first position is 1
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156 * @throws SQLException if there is an error accessing the
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157 * CLOB value
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158 */
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159 @Override
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160 public long position(Clob searchstr, long start) throws SQLException {
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161 return position(searchstr.getSubString(1L, (int)(searchstr.length())), start);
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162 }
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163
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164 /**
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165 * Retrieves the character position at which the specified
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166 * substring searchstr appears in the SQL CLOB value represented
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167 * by this Clob object. The search begins at position start.
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168 *
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169 * @param searchstr the substring for which to search
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170 * @param start the position at which to begin searching;
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171 * the first position is 1
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172 * @return the position at which the substring appears or
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173 * -1 if it is not present; the first position is 1
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174 * @throws SQLException if there is an error accessing the
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175 * CLOB value
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176 */
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177 @Override
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178 public long position(String searchstr, long start) throws SQLException {
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179 checkBufIsNotNull();
0
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180 return (long)(buf.indexOf(searchstr, (int)(start - 1)));
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181 }
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182
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183 @Override
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184 public OutputStream setAsciiStream(long pos) throws SQLException {
149
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185 throw new SQLFeatureNotSupportedException("Method setAsciiStream(long pos) not supported", "0A000");
0
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186 }
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187
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188 @Override
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189 public Writer setCharacterStream(long pos) throws SQLException {
149
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190 throw new SQLFeatureNotSupportedException("Method setCharacterStream(long pos) not supported", "0A000");
0
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191 }
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192
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193 /**
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194 * Writes the given Java String to the CLOB value that this
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195 * Clob object designates at the position pos.
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196 *
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197 * @param pos the position at which to start writing to the
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198 * CLOB value that this Clob object represents
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199 * @param str the string to be written to the CLOB value that
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200 * this Clob designates
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201 * @return the number of characters written
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202 * @throws SQLException if there is an error accessing the
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203 * CLOB value
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204 */
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205 @Override
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206 public int setString(long pos, String str) throws SQLException {
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207 return setString(pos, str, 1, str.length());
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208 }
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209
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210 /**
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211 * Writes len characters of str, starting at character offset,
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212 * to the CLOB value that this Clob represents.
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213 *
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214 * @param pos the position at which to start writing to this
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215 * CLOB object
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216 * @param str the string to be written to the CLOB value that
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217 * this Clob object represents
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218 * @param offset the offset into str to start reading the
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219 * characters to be written
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220 * @param len the number of characters to be written
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221 * @return the number of characters written
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222 * @throws SQLException if there is an error accessing the
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223 * CLOB value
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224 */
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225 @Override
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226 public int setString(long pos, String str, int offset, int len)
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227 throws SQLException
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228 {
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229 checkBufIsNotNull();
0
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230
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231 int buflen = buf.length();
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232 int retlen = Math.min(buflen, (int)(pos - 1 + len));
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233 if (retlen > 0) {
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234 buf.replace((int)(pos - 1), (int)(pos + retlen), str.substring(offset - 1, (offset + len)));
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235 return retlen;
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236 } else {
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237 return 0;
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238 }
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239 }
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240
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241 /**
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242 * Truncates the CLOB value that this Clob designates to
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243 * have a length of len characters.
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244 *
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245 * @param len the length, in bytes, to which the CLOB value
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246 * should be truncated
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247 * @throws SQLException if there is an error accessing the
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248 * CLOB value
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249 */
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250 @Override
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251 public void truncate(long len) throws SQLException {
147
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252 checkBufIsNotNull();
0
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253 // this command is a no-op
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254 }
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255
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256 /**
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257 * Returns the String behind this Clob. This is a MonetClob
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258 * extension that does not violate nor is described in the Clob
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259 * interface.
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260 *
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261 * @return the String this Clob wraps.
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262 */
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263 @Override
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264 public String toString() {
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265 return (buf == null) ? "null" : buf.toString();
0
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266 }
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267 }