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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetClob.java @ 90:b9b35ca2eec2

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Updated copyright year to 2017 in *.java files and MonetDriver.java.in and build.xml and version.sh
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 05 Jan 2017 15:14:15 +0100 (2017-01-05)
parents e092fa8d9ab7
children 08bc9009d190 ad0fe5b04fd4
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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 *
90
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2017 MonetDB B.V.
0
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7 */
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8
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9 package nl.cwi.monetdb.jdbc;
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11 import java.io.InputStream;
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12 import java.io.OutputStream;
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13 import java.io.Reader;
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14 import java.io.Writer;
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15 import java.sql.Clob;
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16 import java.sql.SQLException;
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17 import java.sql.SQLFeatureNotSupportedException;
0
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18
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19 /**
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20 * The MonetClob class implements the {@link java.sql.Clob} interface. Because
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21 * MonetDB/SQL currently has no support for streams, this class is a
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22 * shallow wrapper of a {@link StringBuilder}. It is more or less supplied to
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23 * enable an application that depends on it to run. It may be obvious
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24 * that it is a real resource expensive workaround that contradicts the
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25 * sole reason for a Clob: avoidance of huge resource consumption.
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26 * <b>Use of this class is highly discouraged.</b>
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27 *
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28 * @author Fabian Groffen
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29 */
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30 public class MonetClob implements Clob {
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31
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32 private StringBuilder buf;
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33
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34 protected MonetClob(String in) {
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35 buf = new StringBuilder(in);
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36 }
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37
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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
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42 * resources that it holds. The object is invalid once the free
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43 * method is called.
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44 *
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45 * After free has been called, any attempt to invoke a method other
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46 * than free will result in a SQLException being thrown. If free is
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47 * called multiple times, the subsequent calls to free are treated
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48 * as a no-op.
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49 */
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50 @Override
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51 public void free() {
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52 buf = null;
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53 }
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54
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55 /**
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56 * Retrieves the CLOB value designated by this Clob object as an
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57 * ascii stream.
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58 *
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59 * @return a java.io.InputStream object containing the CLOB data
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60 * @throws SQLFeatureNotSupportedException this JDBC driver does
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61 * not support this method
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62 */
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63 @Override
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64 public InputStream getAsciiStream() throws SQLException {
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65 throw new SQLFeatureNotSupportedException("Operation getAsciiStream() currently not supported", "0A000");
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66 }
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67
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68 /**
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69 * Retrieves the CLOB value designated by this Clob object as a
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70 * java.io.Reader object (or as a stream of characters).
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71 *
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72 * @return a java.io.Reader object containing the CLOB data
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73 * @throws SQLFeatureNotSupportedException this JDBC driver does
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74 * not support this method
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75 */
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76 @Override
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77 public Reader getCharacterStream() throws SQLException {
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78 throw new SQLFeatureNotSupportedException("Operation getCharacterStream() currently not supported", "0A000");
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79 }
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80
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81 /**
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82 * Returns a Reader object that contains a partial Clob value,
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83 * starting with the character specified by pos, which is length
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84 * characters in length.
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85 *
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86 * @param pos the offset to the first character of the partial value
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87 * to be retrieved. The first character in the Clob is at
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88 * position 1.
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89 * @param length the length in characters of the partial value to be
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90 * retrieved.
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91 * @return Reader through which the partial Clob value can be read.
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92 * @throws SQLFeatureNotSupportedException this JDBC driver does
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93 * not support this method
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94 */
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95 @Override
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96 public Reader getCharacterStream(long pos, long length) throws SQLException {
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97 throw new SQLFeatureNotSupportedException("Operation getCharacterStream(long, long) currently not supported", "0A000");
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98 }
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99
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100 /**
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101 * Retrieves a copy of the specified substring in the CLOB value
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102 * designated by this Clob object. The substring begins at
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103 * position pos and has up to length consecutive characters.
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104 *
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105 * @param pos the first character of the substring to be
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106 * extracted. The first character is at position 1.
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107 * @param length the number of consecutive characters to be copied
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108 * @return a String that is the specified substring in the
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109 * CLOB value designated by this Clob object
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110 * @throws SQLException if there is an error accessing the
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111 * CLOB value
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112 */
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113 @Override
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114 public String getSubString(long pos, int length) throws SQLException {
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115 if (buf == null)
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116 throw new SQLException("This Clob has been freed", "M1M20");
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117 try {
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118 return buf.substring((int)(pos - 1), (int)(pos - 1 + length));
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119 } catch (IndexOutOfBoundsException e) {
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120 throw new SQLException(e.getMessage());
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121 }
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122 }
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123
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124 /**
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125 * Retrieves the number of characters in the CLOB value designated
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126 * 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
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130 * of the CLOB value
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131 */
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132 @Override
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133 public long length() throws SQLException {
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134 if (buf == null)
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135 throw new SQLException("This Clob has been freed", "M1M20");
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136 return (long)buf.length();
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137 }
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138
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139 /**
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140 * Retrieves the character position at which the specified Clob
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141 * object searchstr appears in this Clob object. The search
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142 * begins at position start.
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143 *
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144 * @param searchstr the Clob object for which to search
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145 * @param start the position at which to begin searching;
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146 * the first position is 1
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147 * @return the position at which the Clob object appears or
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148 * -1 if it is not present; the first position is 1
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149 * @throws SQLException if there is an error accessing the
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150 * CLOB value
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151 */
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152 @Override
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153 public long position(Clob searchstr, long start) throws SQLException {
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154 return position(searchstr.getSubString(1L, (int)(searchstr.length())), start);
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155 }
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156
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157 /**
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158 * Retrieves the character position at which the specified
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159 * substring searchstr appears in the SQL CLOB value represented
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160 * by this Clob object. The search begins at position start.
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161 *
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162 * @param searchstr the substring for which to search
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163 * @param start the position at which to begin searching;
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164 * the first position is 1
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165 * @return the position at which the substring appears or
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166 * -1 if it is not present; the first position is 1
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167 * @throws SQLException if there is an error accessing the
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168 * CLOB value
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169 */
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170 @Override
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171 public long position(String searchstr, long start) throws SQLException {
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172 if (buf == null)
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173 throw new SQLException("This Clob has been freed", "M1M20");
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174 return (long)(buf.indexOf(searchstr, (int)(start - 1)));
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175 }
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176
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177 @Override
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178 public OutputStream setAsciiStream(long pos) throws SQLException {
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179 if (buf == null)
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180 throw new SQLException("This Clob has been freed", "M1M20");
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181 throw new SQLException("Operation setAsciiStream(long pos) currently not supported", "0A000");
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182 }
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183
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184 @Override
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185 public Writer setCharacterStream(long pos) throws SQLException {
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186 if (buf == null)
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187 throw new SQLException("This Clob has been freed", "M1M20");
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188 throw new SQLException("Operation setCharacterStream(long pos) currently not supported", "0A000");
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189 }
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190
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191 /**
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192 * Writes the given Java String to the CLOB value that this
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193 * Clob object designates at the position pos.
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194 *
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195 * @param pos the position at which to start writing to the
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196 * CLOB value that this Clob object represents
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197 * @param str the string to be written to the CLOB value that
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198 * this Clob designates
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199 * @return the number of characters written
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200 * @throws SQLException if there is an error accessing the
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201 * CLOB value
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Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
202 */
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Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
203 @Override
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204 public int setString(long pos, String str) throws SQLException {
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205 return setString(pos, str, 1, str.length());
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206 }
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diff changeset
207
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208 /**
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209 * Writes len characters of str, starting at character offset,
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210 * to the CLOB value that this Clob represents.
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Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
211 *
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212 * @param pos the position at which to start writing to this
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213 * CLOB object
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diff changeset
214 * @param str the string to be written to the CLOB value that
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215 * this Clob object represents
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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216 * @param offset the offset into str to start reading the
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217 * characters to be written
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218 * @param len the number of characters to be written
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219 * @return the number of characters written
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220 * @throws SQLException if there is an error accessing the
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diff changeset
221 * CLOB value
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
222 */
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223 @Override
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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224 public int setString(long pos, String str, int offset, int len)
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225 throws SQLException
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diff changeset
226 {
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
227 if (buf == null)
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diff changeset
228 throw new SQLException("This Clob has been freed", "M1M20");
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diff changeset
229
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230 int buflen = buf.length();
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231 int retlen = Math.min(buflen, (int)(pos - 1 + len));
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diff changeset
232
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233 if (retlen > 0) {
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parents:
diff changeset
234 buf.replace((int)(pos - 1), (int)(pos + retlen), str.substring(offset - 1, (offset + len)));
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235 return retlen;
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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236 } else {
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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237 return 0;
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
238 }
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
239 }
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
240
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
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diff changeset
241 /**
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
242 * Truncates the CLOB value that this Clob designates to
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diff changeset
243 * have a length of len characters.
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diff changeset
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
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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247 * @throws SQLException if there is an error accessing the
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248 * CLOB value
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
249 */
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250 @Override
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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251 public void truncate(long len) throws SQLException {
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diff changeset
252 if (buf == null)
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
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diff changeset
253 throw new SQLException("This Clob has been freed", "M1M20");
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254 // this command is a no-op
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255 }
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diff changeset
256
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257 /**
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258 * Returns the String behind this Clob. This is a MonetClob
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259 * extension that does not violate nor is described in the Clob
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260 * interface.
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261 *
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262 * @return the String this Clob wraps.
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263 */
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264 @Override
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265 public String toString() {
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266 if (buf == null)
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267 return "<a freed MonetClob instance>";
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268 return buf.toString();
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269 }
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270 }