Mercurial > hg > monetdb-java

annotate src/main/java/nl/cwi/monetdb/jdbc/MonetClob.java @ 102:08bc9009d190 embedded

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Merged with default
author Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
date Fri, 13 Jan 2017 18:16:30 +0100 (2017-01-13)
parents 4bb4e988164d b9b35ca2eec2
children 60063c67f9e7
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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.*;
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12 import java.sql.Clob;
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13 import java.sql.SQLException;
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14
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15 /**
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16 * The MonetClob class implements the {@link java.sql.Clob} interface. Because
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17 * MonetDB/SQL currently has no support for streams, this class is a
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18 * shallow wrapper of a {@link StringBuilder}. It is more or less supplied to
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19 * enable an application that depends on it to run. It may be obvious
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20 * that it is a real resource expensive workaround that contradicts the
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21 * sole reason for a Clob: avoidance of huge resource consumption.
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22 * <b>Use of this class is highly discouraged.</b>
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23 *
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24 * @author Fabian Groffen
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25 */
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26 public class MonetClob implements Clob, Serializable, Comparable<MonetClob> {
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28 private final StringBuilder buffer;
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30 public MonetClob(String in) {
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31 buffer = new StringBuilder(in);
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32 }
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33
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34 public MonetClob(char[] toParse, int startPosition, int count) {
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35 buffer = new StringBuilder(new String(toParse, startPosition, count));
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36 }
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38 //== begin interface Clob
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39
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40 /**
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41 * This method frees the Clob object and releases the resources the resources that it holds. The object is invalid
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42 * once the free method is called.
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43 *
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44 * After free has been called, any attempt to invoke a method other than free will result in a SQLException being
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45 * thrown. If free is called multiple times, the subsequent calls to free are treated as a no-op.
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46 */
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47 @Override
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48 public void free() {
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49 buffer.setLength(0);
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50 }
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51
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52 /**
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53 * Retrieves the CLOB value designated by this Clob object as an ascii stream.
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54 *
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55 * @return a java.io.InputStream object containing the CLOB data
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56 * @throws SQLException if there is an error accessing the CLOB value
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57 */
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58 @Override
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59 public InputStream getAsciiStream() throws SQLException {
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60 if (buffer.length() == 0)
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61 throw new SQLException("This Clob has been freed", "M1M20");
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62 return new ByteArrayInputStream(buffer.toString().getBytes());
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63 }
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65 /**
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66 * Retrieves the CLOB value designated by this Clob object as a java.io.Reader object
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67 * (or as a stream of characters).
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68 *
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69 * @return a java.io.Reader object containing the CLOB data
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70 * @throws SQLException if there is an error accessing the CLOB value
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71 */
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72 @Override
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73 public Reader getCharacterStream() throws SQLException {
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74 if (buffer.length() == 0)
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75 throw new SQLException("This Clob has been freed", "M1M20");
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76 return new StringReader(buffer.toString());
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77 }
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79 /**
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80 * Returns a Reader object that contains a partial Clob value, starting with the character specified by pos, which
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81 * is length characters in length.
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82 *
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83 * @param pos the offset to the first character of the partial value to be retrieved. The first character in the
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84 * Clob is at position 1.
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85 * @param length the length in characters of the partial value to be retrieved.
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86 * @return Reader through which the partial Clob value can be read.
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87 * @throws SQLException if there is an error accessing the CLOB value
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88 */
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89 @Override
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90 public Reader getCharacterStream(long pos, long length) throws SQLException {
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91 if (buffer.length() == 0)
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92 throw new SQLException("This Clob has been freed", "M1M20");
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93 return new StringReader(buffer.substring((int)(pos - 1), (int)(pos - 1 + length)));
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94 }
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95
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96 /**
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97 * Retrieves a copy of the specified substring in the CLOB value designated by this Clob object. The substring
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98 * begins at position pos and has up to length consecutive characters.
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99 *
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100 * @param pos the first character of the substring to be extracted. The first character is at position 1.
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101 * @param length the number of consecutive characters to be copied
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102 * @return a String that is the specified substring in the CLOB value designated by this Clob object
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103 * @throws SQLException if there is an error accessing the CLOB value
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104 */
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105 @Override
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106 public String getSubString(long pos, int length) throws SQLException {
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107 if (buffer.length() == 0)
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108 throw new SQLException("This Clob has been freed", "M1M20");
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109 try {
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110 return buffer.substring((int)(pos - 1), (int)(pos - 1 + length));
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111 } catch (IndexOutOfBoundsException e) {
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112 throw new SQLException(e.getMessage());
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113 }
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114 }
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115
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116 /**
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117 * Retrieves the number of characters in the CLOB value designated by this Clob object.
0
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118 *
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119 * @return length of the CLOB in characters
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120 * @throws SQLException if there is an error accessing the length of the CLOB value
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121 */
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122 @Override
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123 public long length() throws SQLException {
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124 if (buffer.length() == 0)
0
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125 throw new SQLException("This Clob has been freed", "M1M20");
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126 return (long) buffer.length();
0
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127 }
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128
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129 /**
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130 * Retrieves the character position at which the specified Clob object searchstr appears in this Clob object.
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131 * The search begins at position start.
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132 *
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133 * @param searchstr the Clob object for which to search
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134 * @param start the position at which to begin searching; the first position is 1
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135 * @return the position at which the Clob object appears or -1 if it is not present; the first position is 1
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136 * @throws SQLException if there is an error accessing the CLOB value
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137 */
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138 @Override
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139 public long position(Clob searchstr, long start) throws SQLException {
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140 return position(searchstr.getSubString(1L, (int)(searchstr.length())), start);
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141 }
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142
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143 /**
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144 * Retrieves the character position at which the specified substring searchstr appears in the SQL CLOB value
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145 * represented by this Clob object. The search begins at position start.
0
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146 *
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147 * @param searchstr the substring for which to search
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148 * @param start the position at which to begin searching; the first position is 1
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149 * @return the position at which the substring appears or -1 if it is not present; the first position is 1
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150 * @throws SQLException if there is an error accessing the CLOB value
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151 */
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152 @Override
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153 public long position(String searchstr, long start) throws SQLException {
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154 if (buffer.length() == 0)
0
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155 throw new SQLException("This Clob has been freed", "M1M20");
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156 return (long)(buffer.indexOf(searchstr, (int)(start - 1)));
0
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157 }
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158
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159 @Override
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160 public OutputStream setAsciiStream(long pos) throws SQLException {
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161 if (buffer.length() == 0)
0
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162 throw new SQLException("This Clob has been freed", "M1M20");
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163 throw new SQLException("Operation setAsciiStream(long pos) currently not supported", "0A000");
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164 }
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165
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166 @Override
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167 public Writer setCharacterStream(long pos) throws SQLException {
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168 if (buffer.length() == 0)
0
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169 throw new SQLException("This Clob has been freed", "M1M20");
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170 throw new SQLException("Operation setCharacterStream(long pos) currently not supported", "0A000");
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171 }
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172
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173 /**
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174 * Writes the given Java String to the CLOB value that this Clob object designates at the position pos.
0
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175 *
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176 * @param pos the position at which to start writing to the CLOB value that this Clob object represents
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177 * @param str the string to be written to the CLOB value that this Clob designates
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178 * @return the number of characters written
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179 * @throws SQLException if there is an error accessing the CLOB value
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180 */
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181 @Override
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182 public int setString(long pos, String str) throws SQLException {
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183 return setString(pos, str, 1, str.length());
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184 }
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185
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186 /**
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187 * Writes len characters of str, starting at character offset, to the CLOB value that this Clob represents.
0
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188 *
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189 * @param pos the position at which to start writing to this CLOB object
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190 * @param str the string to be written to the CLOB value that this Clob object represents
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191 * @param offset the offset into str to start reading the characters to be written
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192 * @param len the number of characters to be written
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193 * @return the number of characters written
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194 * @throws SQLException if there is an error accessing the CLOB value
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195 */
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196 @Override
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197 public int setString(long pos, String str, int offset, int len) throws SQLException {
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198 if (buffer.length() == 0)
0
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199 throw new SQLException("This Clob has been freed", "M1M20");
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200
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201 int buflen = buffer.length();
0
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202 int retlen = Math.min(buflen, (int)(pos - 1 + len));
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203
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204 if (retlen > 0) {
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205 buffer.replace((int)(pos - 1), (int)(pos + retlen), str.substring(offset - 1, (offset + len)));
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206 return retlen;
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207 } else {
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208 return 0;
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209 }
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210 }
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211
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212 /**
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213 * Truncates the CLOB value that this Clob designates to have a length of len characters.
0
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214 *
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215 * @param len the length, in bytes, to which the CLOB value should be truncated
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216 * @throws SQLException if there is an error accessing the CLOB value
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217 */
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218 @Override
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219 public void truncate(long len) throws SQLException {
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220 if (buffer.length() == 0)
0
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221 throw new SQLException("This Clob has been freed", "M1M20");
87
2b5e32efb1a4 Made all the mappings for the MAPI connection, now it needs to be added on the Embedded connection. Changed the compilation target to 1.8 because of the timezones. Implemented some JDBC methods as well.
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222 buffer.setLength((int) len);
0
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223 }
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224
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225 /**
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226 * Returns the String behind this Clob. This is a MonetClob extension that does not violate nor is described in
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227 * the Clob interface.
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228 *
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229 * @return the String this Clob wraps.
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230 */
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231 @Override
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232 public String toString() {
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
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233 if (buffer.length() == 0)
0
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234 return "<a freed MonetClob instance>";
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86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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235 return buffer.toString();
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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236 }
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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237
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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238 /**
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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239 * Overriding the equals method for the byte array.
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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240 */
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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241 @Override
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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242 public boolean equals(Object obj) {
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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243 return obj instanceof MonetClob && this.toString().equals(obj.toString());
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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244 }
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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245
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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246 /**
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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247 * Overriding the hashCode method for the byte array.
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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248 */
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
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249 @Override
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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250 public int hashCode() { return this.buffer.toString().hashCode(); }
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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251
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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252 /**
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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253 * Adding the compare to method.
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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254 */
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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255 @Override
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
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256 public int compareTo(MonetClob o) {
86967be24645 Ready to start testing the old mapi connection. After passing the tests. The embedded integration will be very straightforward.
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257 return this.toString().compareTo(o.toString());
0
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258 }
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259 }