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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetClob.java @ 200:c38d4eaf5479

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It's 2018 now.
author Sjoerd Mullender <sjoerd@acm.org>
date Thu, 04 Jan 2018 13:24:01 +0100 (2018-01-04)
parents 1e49fc74dba4
children 5b13ccaba741 94131372ad0b
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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 *
200
c38d4eaf5479 It's 2018 now.
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2018 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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10
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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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19
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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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38
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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
0
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45 //== begin interface Clob
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46
0
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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();
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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 {
147
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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
1e49fc74dba4 Implemented methods getCharacterStream() and getCharacterStream(long pos, long length) in class MonetClob.
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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
1e49fc74dba4 Implemented methods getCharacterStream() and getCharacterStream(long pos, long length) in class MonetClob.
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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 {
147
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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 }