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annotate src/main/java/org/monetdb/jdbc/MonetClob.java @ 451:3dfcd06fd8ba

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Correcting typos in documentation text. Also improved the readability of the generated javadoc documents.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 04 Mar 2021 18:57:51 +0100 (2021-03-04)
parents bf9f6b6ecf40
children 6aa38e8c0f2d
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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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bf9f6b6ecf40 Update Copyright year.
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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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f523727db392 Moved Java classes from packages starting with nl.cwi.monetdb.* to package org.monetdb.*
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9 package org.monetdb.jdbc;
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e092fa8d9ab7 Expand import java.*.* statements
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11 import java.io.InputStream;
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12 import java.io.Reader;
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13 import java.io.StringReader;
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14 import java.sql.Clob;
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15 import java.sql.SQLException;
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16 import java.sql.SQLFeatureNotSupportedException;
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18 /**
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19 *<pre>
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20 * The MonetClob class implements the {@link java.sql.Clob} interface.
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21 *
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22 * Because 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 *</pre>
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29 *
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30 * @author Fabian Groffen
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31 */
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32 public final class MonetClob implements Clob {
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33 private StringBuilder buf;
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34
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35 protected MonetClob(final String in) {
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36 buf = new StringBuilder(in);
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37 }
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38
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39 /* internal utility method */
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40 private final 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 SQLException - if there is an error accessing the CLOB value
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68 */
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69 @Override
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70 public InputStream getAsciiStream() throws SQLException {
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71 checkBufIsNotNull();
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72 return new java.io.ByteArrayInputStream(buf.toString().getBytes());
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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 SQLException - if there is an error accessing the CLOB value
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81 */
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82 @Override
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83 public Reader getCharacterStream() throws SQLException {
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84 checkBufIsNotNull();
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85 return new StringReader(buf.toString());
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86 }
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87
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88 /**
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89 * Returns a Reader object that contains a partial Clob value,
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90 * starting with the character specified by pos, which is length
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91 * characters in length.
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92 *
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93 * @param pos the offset to the first character of the partial value
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94 * to be retrieved. The first character in the Clob is at position 1.
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95 * @param length the length in characters of the partial value to be retrieved.
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96 * @return Reader through which the partial Clob value can be read.
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97 * @throws SQLException - if pos is less than 1
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98 * or if pos is greater than the number of characters in the Clob
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99 * or if pos + length is greater than the number of characters in the Clob
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100 */
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101 @Override
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102 public Reader getCharacterStream(final long pos, final long length) throws SQLException {
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103 // as length will be casted to int, check it for too big value first
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104 if (length < 0 || length > Integer.MAX_VALUE) {
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105 throw new SQLException("Invalid length value: " + length, "M1M05");
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106 }
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107 // buf and input argument pos will be checked in method getSubString(long, int)
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108 return new StringReader(getSubString(pos, (int)length));
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109 }
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110
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111 /**
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112 * Retrieves a copy of the specified substring in the CLOB value
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113 * designated by this Clob object. The substring begins at
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114 * position pos and has up to length consecutive characters.
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115 *
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116 * @param pos the first character of the substring to be
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117 * extracted. The first character is at position 1.
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118 * @param length the number of consecutive characters to be copied
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119 * @return a String that is the specified substring in the
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120 * CLOB value designated by this Clob object
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121 * @throws SQLException - if pos is less than 1
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122 * or if pos is greater than the number of characters in the Clob
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123 * or if pos + length is greater than the number of characters in the Clob
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124 * @throws SQLException - if there is an error accessing the CLOB value
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125 */
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126 @Override
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127 public String getSubString(final long pos, final int length) throws SQLException {
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128 checkBufIsNotNull();
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129 if (pos == 1L && length == buf.length()) {
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130 // the whole string is requested
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131 return buf.toString();
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132 }
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133 if (pos < 1 || pos > buf.length()) {
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134 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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135 }
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136 if (length < 0 || pos -1 + length > buf.length()) {
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137 throw new SQLException("Invalid length value: " + length, "M1M05");
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138 }
0
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139 try {
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140 return buf.substring((int)(pos - 1), (int)(pos - 1 + length));
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141 } catch (IndexOutOfBoundsException e) {
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142 throw new SQLException(e.getMessage(), "M1M05");
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143 }
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144 }
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145
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146 /**
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147 * Retrieves the number of characters in the CLOB value designated
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148 * by this Clob object.
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149 *
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150 * @return length of the CLOB in characters
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151 * @throws SQLException if there is an error accessing the length
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152 * of the CLOB value
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153 */
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154 @Override
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155 public long length() throws SQLException {
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156 checkBufIsNotNull();
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157 return (long)buf.length();
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158 }
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159
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160 /**
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161 * Retrieves the character position at which the specified Clob
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162 * object searchstr appears in this Clob object. The search
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163 * begins at position start.
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164 *
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165 * @param searchstr the Clob object for which to search
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166 * @param start the position at which to begin searching;
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167 * the first position is 1
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168 * @return the position at which the Clob object appears or
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169 * -1 if it is not present; the first position is 1
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170 * @throws SQLException - if there is an error accessing the CLOB value
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171 */
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172 @Override
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173 public long position(final Clob searchstr, final long start) throws SQLException {
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174 if (searchstr == null) {
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175 throw new SQLException("Missing searchstr object", "M1M05");
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176 }
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177 // buf and input argument start will be checked in method position(String, long)
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178 return position(searchstr.toString(), start);
0
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179 }
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180
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181 /**
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182 * Retrieves the character position at which the specified
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183 * substring searchstr appears in the SQL CLOB value represented
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184 * by this Clob object. The search begins at position start.
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185 *
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186 * @param searchstr the substring for which to search
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187 * @param start the position at which to begin searching;
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188 * the first position is 1
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189 * @return the position at which the substring appears or
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190 * -1 if it is not present; the first position is 1
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191 * @throws SQLException - if there is an error accessing the CLOB value
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192 */
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193 @Override
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194 public long position(final String searchstr, final long start) throws SQLException {
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195 checkBufIsNotNull();
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196 if (searchstr == null) {
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197 throw new SQLException("Missing searchstr object", "M1M05");
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198 }
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199 if (start < 1 || start > buf.length()) {
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200 throw new SQLException("Invalid start value: " + start, "M1M05");
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201 }
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202 return (long)(buf.indexOf(searchstr, (int)(start - 1)));
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203 }
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204
209
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205 /**
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206 * Retrieves a stream to be used to write Ascii characters to the CLOB value that this
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207 * Clob object represents, starting at position pos. Characters written to the stream
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208 * will overwrite the existing characters in the Clob object starting at the position pos.
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209 * If the end of the Clob value is reached while writing characters to the stream,
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210 * then the length of the Clob value will be increased to accomodate the extra characters.
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211 *
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212 * Note: If the value specified for pos is greater then the length+1 of the CLOB value
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213 * then the behavior is undefined. Some JDBC drivers may throw a SQLException while
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214 * other drivers may support this operation.
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215 *
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216 * @param pos - the position at which to start writing to this CLOB object; The first position is 1
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217 * @return the stream to which ASCII encoded characters can be written
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218 * @throws SQLException - if there is an error accessing the CLOB value or if pos is less than 1
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219 * @throws SQLFeatureNotSupportedException - if the JDBC driver does not support this method
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220 */
0
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221 @Override
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222 public java.io.OutputStream setAsciiStream(final long pos) throws SQLException {
262
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223 throw MonetWrapper.newSQLFeatureNotSupportedException("setAsciiStream");
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224 }
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225
209
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226 /**
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227 * Retrieves a stream to be used to write a stream of Unicode characters to the CLOB value that
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228 * this Clob object represents, starting at position pos. Characters written to the stream
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229 * will overwrite the existing characters in the Clob object starting at the position pos.
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230 * If the end of the Clob value is reached while writing characters to the stream,
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231 * then the length of the Clob value will be increased to accomodate the extra characters.
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232 *
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233 * Note: If the value specified for pos is greater then the length+1 of the CLOB value
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234 * then the behavior is undefined. Some JDBC drivers may throw a SQLException while
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235 * other drivers may support this operation.
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236 *
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237 * @param pos - the position at which to start writing to this CLOB object; The first position is 1
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238 * @return the stream to which Unicode encoded characters can be written
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239 * @throws SQLException - if there is an error accessing the CLOB value or if pos is less than 1
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240 * @throws SQLFeatureNotSupportedException - if the JDBC driver does not support this method
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241 */
0
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242 @Override
295
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243 public java.io.Writer setCharacterStream(final long pos) throws SQLException {
262
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244 throw MonetWrapper.newSQLFeatureNotSupportedException("setCharacterStream");
0
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245 }
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246
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247 /**
209
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248 * Writes the given Java String to the CLOB value that this Clob object designates at the position pos.
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249 * The string will overwrite the existing characters in the Clob object starting at the position pos.
289
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250 * If the end of the Clob value is reached while writing the given string,
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251 * then the length of the Clob value will be increased to accomodate the extra characters.
0
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252 *
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253 * @param pos the position at which to start writing to the CLOB value that this Clob object represents
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254 * @param str the string to be written to the CLOB value that this Clob designates
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255 * @return the number of characters written
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256 * @throws SQLException if there is an error accessing the CLOB value or if pos is less than 1
0
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257 */
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258 @Override
295
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259 public int setString(final long pos, final String str) throws SQLException {
316
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260 // buf and input arguments will be checked in method setString(long, String, int, int)
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261 final int len = (str != null) ? str.length() : 0;
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262 return setString(pos, str, 0, len);
0
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263 }
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264
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265 /**
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266 * Writes len characters of str, starting at character offset, to the CLOB value that this Clob represents.
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267 * The string will overwrite the existing characters in the Clob object starting at the position pos.
289
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268 * If the end of the Clob value is reached while writing the given string,
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269 * then the length of the Clob value will be increased to accomodate the extra characters.
0
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270 *
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271 * @param pos the position at which to start writing to this CLOB object
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272 * @param str the string to be written to the CLOB value that this Clob object represents
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273 * @param offset the offset into str to start reading the characters to be written
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274 * @param len the number of characters to be written
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275 * @return the number of characters written
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276 * @throws SQLException if there is an error accessing the CLOB value or if pos is less than 1
0
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277 */
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278 @Override
295
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279 public int setString(final long pos, final String str, final int offset, final int len)
0
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280 throws SQLException
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281 {
147
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282 checkBufIsNotNull();
209
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283 if (str == null) {
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284 throw new SQLException("Missing str object", "M1M05");
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285 }
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286 if (pos < 1 || pos > Integer.MAX_VALUE) {
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287 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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288 }
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289 if (offset < 0 || offset > str.length()) {
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290 throw new SQLException("Invalid offset value: " + offset, "M1M05");
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291 }
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292 if (len < 1 || (offset + len) > str.length()) {
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293 throw new SQLException("Invalid len value: " + len, "M1M05");
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294 }
316
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295 if (((int) pos + len) > buf.capacity()) {
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296 // enlarge the buffer before filling it
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297 buf.ensureCapacity((int) pos + len);
0
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298 }
316
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299 buf.replace((int) pos - 1, (int) pos + len, str.substring(offset, (offset + len)));
209
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300 return len;
0
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301 }
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302
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303 /**
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304 * Truncates the CLOB value that this Clob designates to
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305 * have a length of len characters.
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306 *
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307 * @param len the length, in bytes, to which the CLOB value should be truncated
0
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308 * @throws SQLException if there is an error accessing the
209
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309 * CLOB value or if len is less than 0
0
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310 */
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311 @Override
295
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312 public void truncate(final long len) throws SQLException {
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313 checkBufIsNotNull();
209
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314 if (len < 0 || len > buf.length()) {
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315 throw new SQLException("Invalid len value: " + len, "M1M05");
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316 }
316
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317 buf.setLength((int)len);
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318 // reduce storage used for the character sequence.
289
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319 buf.trimToSize();
0
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320 }
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321
209
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322
0
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323 /**
289
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324 * Returns a String from this MonetClob buf.
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325 *
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326 * @return the String this MonetClob wraps or empty string when this MonetClob was freed.
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327 */
316
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328 public String toString() {
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329 if (buf == null)
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330 return "";
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331 return buf.toString();
0
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332 }
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333 }