Mercurial > hg > monetdb-java

annotate src/main/java/nl/cwi/monetdb/jdbc/MonetClob.java @ 172:60063c67f9e7 embedded

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Merged with default
author Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
date Tue, 19 Sep 2017 13:49:34 +0200 (2017-09-19)
parents 08bc9009d190 1e49fc74dba4
children 5b13ccaba741
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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 - 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 import java.sql.SQLFeatureNotSupportedException;
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16 /**
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17 * The MonetClob class implements the {@link java.sql.Clob} interface. Because
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18 * MonetDB/SQL currently has no support for streams, this class is a
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19 * shallow wrapper of a {@link StringBuilder}. It is more or less supplied to
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20 * enable an application that depends on it to run. It may be obvious
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21 * that it is a real resource expensive workaround that contradicts the
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22 * sole reason for a Clob: avoidance of huge resource consumption.
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23 * <b>Use of this class is highly discouraged.</b>
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24 *
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25 * @author Fabian Groffen
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26 */
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27 public class MonetClob implements Clob, Serializable, Comparable<MonetClob> {
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29 private final StringBuilder buffer;
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31 public MonetClob(String in) {
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32 if(in != null)
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33 buffer = new StringBuilder(in);
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34 else
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35 buffer = null;
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36 }
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37
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38 public MonetClob(char[] toParse, int startPosition, int count) {
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39 buffer = new StringBuilder(new String(toParse, startPosition, count));
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40 }
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41
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42 /* internal utility method */
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43 private void checkBufIsNotNull() throws SQLException {
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44 if (buffer == null)
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45 throw new SQLException("This MonetClob has been freed", "M1M20");
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46 }
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47
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48 //== begin interface Clob
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49
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50 /**
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51 * This method frees the Clob object and releases the resources the resources that it holds. The object is invalid
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52 * once the free method is called.
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53 *
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54 * After free has been called, any attempt to invoke a method other than free will result in a SQLException being
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55 * thrown. If free is called multiple times, the subsequent calls to free are treated 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 if (buffer != null)
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60 buffer.setLength(0);
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61 }
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63 /**
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64 * Retrieves the CLOB value designated by this Clob object as an 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 if (buffer.length() == 0)
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73 throw new SQLException("This Clob has been freed", "M1M20");
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74 return new ByteArrayInputStream(buffer.toString().getBytes());
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75 }
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76
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77 /**
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78 * Retrieves the CLOB value designated by this Clob object as a java.io.Reader object
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79 * (or as a stream of characters).
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80 *
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81 * @return a java.io.Reader object containing the CLOB data
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82 * @throws SQLException if there is an error accessing the CLOB value
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83 */
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84 @Override
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85 public Reader getCharacterStream() throws SQLException {
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86 checkBufIsNotNull();
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87 return new StringReader(buffer.toString());
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88 }
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89
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90 /**
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91 * Returns a Reader object that contains a partial Clob value, starting with the character specified by pos, which
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92 * is length 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 to be retrieved. The first character in the
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95 * Clob is at position 1.
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96 * @param length the length in characters of the partial value to be retrieved.
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97 * @return Reader through which the partial Clob value can be read.
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98 * @throws SQLException if there is an error accessing the CLOB value
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99 */
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100 @Override
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101 public Reader getCharacterStream(long pos, long length) throws SQLException {
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102 checkBufIsNotNull();
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103 return new StringReader(getSubString(pos, (int)length));
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104 }
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105
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106 /**
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107 * Retrieves a copy of the specified substring in the CLOB value designated by this Clob object. The substring
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108 * begins at position pos and has up to length consecutive characters.
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109 *
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110 * @param pos the first character of the substring to be extracted. The first character is at position 1.
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111 * @param length the number of consecutive characters to be copied
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112 * @return a String that is the specified substring in the CLOB value designated by this Clob object
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113 * @throws SQLException if there is an error accessing the CLOB value
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114 */
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115 @Override
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116 public String getSubString(long pos, int length) throws SQLException {
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117 checkBufIsNotNull();
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118 try {
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119 return buffer.substring((int)(pos - 1), (int)(pos - 1 + length));
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120 } catch (IndexOutOfBoundsException e) {
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121 throw new SQLException(e.getMessage());
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122 }
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123 }
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124
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125 /**
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126 * Retrieves the number of characters in the CLOB value designated by this Clob object.
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127 *
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128 * @return length of the CLOB in characters
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129 * @throws SQLException if there is an error accessing the length of the CLOB value
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130 */
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131 @Override
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132 public long length() throws SQLException {
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133 checkBufIsNotNull();
172
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134 return (long)buffer.length();
0
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135 }
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136
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137 /**
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138 * Retrieves the character position at which the specified Clob object searchstr appears in this Clob object.
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139 * The search begins at position start.
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140 *
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141 * @param searchstr the Clob object for which to search
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142 * @param start the position at which to begin searching; the first position is 1
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143 * @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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144 * @throws SQLException if there is an error accessing the CLOB value
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145 */
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146 @Override
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147 public long position(Clob searchstr, long start) throws SQLException {
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148 checkBufIsNotNull();
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149 return position(searchstr.getSubString(1L, (int)(searchstr.length())), start);
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150 }
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151
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152 /**
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153 * Retrieves the character position at which the specified substring searchstr appears in the SQL CLOB value
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154 * represented by this Clob object. The search begins at position start.
0
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155 *
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156 * @param searchstr the substring for which to search
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157 * @param start the position at which to begin searching; the first position is 1
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158 * @return the position at which the substring appears or -1 if it is not present; the first position is 1
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159 * @throws SQLException if there is an error accessing the CLOB value
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160 */
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161 @Override
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162 public long position(String searchstr, long start) throws SQLException {
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163 checkBufIsNotNull();
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164 return (long)(buffer.indexOf(searchstr, (int)(start - 1)));
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165 }
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166
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167 @Override
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168 public OutputStream setAsciiStream(long pos) throws SQLException {
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169 throw new SQLFeatureNotSupportedException("Method setAsciiStream(long pos) not supported", "0A000");
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170 }
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171
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172 @Override
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173 public Writer setCharacterStream(long pos) throws SQLException {
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174 throw new SQLFeatureNotSupportedException("Method setCharacterStream(long pos) not supported", "0A000");
0
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175 }
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176
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177 /**
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178 * Writes the given Java String to the CLOB value that this Clob object designates at the position pos.
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179 *
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180 * @param pos the position at which to start writing to the CLOB value that this Clob object represents
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181 * @param str the string to be written to the CLOB value that this Clob designates
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182 * @return the number of characters written
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183 * @throws SQLException if there is an error accessing the CLOB value
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184 */
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185 @Override
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186 public int setString(long pos, String str) throws SQLException {
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187 return setString(pos, str, 1, str.length());
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188 }
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189
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190 /**
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191 * Writes len characters of str, starting at character offset, to the CLOB value that this Clob represents.
0
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192 *
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193 * @param pos the position at which to start writing to this CLOB object
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194 * @param str the string to be written to the CLOB value that this Clob object represents
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195 * @param offset the offset into str to start reading the characters to be written
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196 * @param len the number of characters to be written
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197 * @return the number of characters written
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198 * @throws SQLException if there is an error accessing the CLOB value
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199 */
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200 @Override
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201 public int setString(long pos, String str, int offset, int len) throws SQLException {
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202 checkBufIsNotNull();
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203 int buflen = buffer.length();
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204 int retlen = Math.min(buflen, (int)(pos - 1 + len));
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205 if (retlen > 0) {
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206 buffer.replace((int)(pos - 1), (int)(pos + retlen), str.substring(offset - 1, (offset + len)));
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207 return retlen;
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208 } else {
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209 return 0;
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210 }
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211 }
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212
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213 /**
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214 * Truncates the CLOB value that this Clob designates to have a length of len characters.
0
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215 *
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216 * @param len the length, in bytes, to which the CLOB value should be truncated
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217 * @throws SQLException if there is an error accessing the CLOB value
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218 */
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219 @Override
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220 public void truncate(long len) throws SQLException {
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221 checkBufIsNotNull();
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() {
172
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233 if (buffer == null || buffer.length() == 0)
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234 return "null";
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235 return buffer.toString();
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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.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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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.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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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.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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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.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
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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
diff changeset
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
diff changeset
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
diff changeset
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>
parents: 66
diff changeset
249 @Override
172
60063c67f9e7 Merged with default
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 102 149
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250 public int hashCode() {
60063c67f9e7 Merged with default
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 102 149
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251 if (buffer == null || buffer.length() == 0)
60063c67f9e7 Merged with default
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 102 149
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252 return 0;
60063c67f9e7 Merged with default
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 102 149
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253 return this.buffer.toString().hashCode();
60063c67f9e7 Merged with default
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 102 149
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254 }
68
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
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
diff changeset
256 /**
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
diff changeset
257 * 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
diff changeset
258 */
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
diff changeset
259 @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
diff changeset
260 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.
Pedro Ferreira <pedro.ferreira@monetdbsolutions.com>
parents: 66
diff changeset
261 return this.toString().compareTo(o.toString());
0
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
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262 }
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
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263 }