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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetClob.java @ 209:94131372ad0b

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Improved implementation of MonetClob and MonetBlob classes by adding checks on validity of input parameters of methods of those classes. This makes them more robust against incorrect usage by throwing an SQLException instead of a NullPointerException or other Exception. Also made these classes final, as we do not want anybody to subclass these classes.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 08 Mar 2018 18:16:05 +0100 (2018-03-08)
parents c38d4eaf5479
children 51e886d7f3b4 d4baf8a4b43a
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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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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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20 /**
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21 * The MonetClob class implements the {@link java.sql.Clob} interface.
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22 *
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23 * Because MonetDB/SQL currently has no support for streams, this class is a
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24 * shallow wrapper of a {@link StringBuilder}. It is more or less supplied to
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25 * enable an application that depends on it to run. It may be obvious
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26 * that it is a real resource expensive workaround that contradicts the
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27 * sole reason for a Clob: avoidance of huge resource consumption.
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28 * <b>Use of this class is highly discouraged.</b>
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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
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34 private StringBuilder buf;
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35
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36 protected MonetClob(String in) {
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37 buf = new StringBuilder(in);
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38 }
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40 /* internal utility method */
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41 final private void checkBufIsNotNull() throws SQLException {
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42 if (buf == null)
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43 throw new SQLException("This MonetClob has been freed", "M1M20");
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44 }
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46 //== begin interface Clob
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47
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48 /**
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49 * This method frees the Clob object and releases the resources the
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50 * resources that it holds. The object is invalid once the free
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51 * method is called.
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52 *
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53 * After free has been called, any attempt to invoke a method other
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54 * than free will result in a SQLException being thrown. If free is
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55 * called multiple times, the subsequent calls to free are treated
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56 * as a no-op.
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57 */
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58 @Override
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59 public void free() {
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60 buf = null;
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61 }
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62
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63 /**
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64 * Retrieves the CLOB value designated by this Clob object as an
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65 * ascii stream.
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66 *
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67 * @return a java.io.InputStream object containing the CLOB data
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68 * @throws SQLException - if there is an error accessing the CLOB value
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69 * @throws SQLFeatureNotSupportedException this JDBC driver does
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70 * not support this method
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71 */
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72 @Override
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73 public InputStream getAsciiStream() throws SQLException {
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74 throw new SQLFeatureNotSupportedException("Method getAsciiStream() not supported", "0A000");
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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
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79 * java.io.Reader object (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(buf.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,
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92 * starting with the character specified by pos, which is length
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93 * characters in length.
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94 *
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95 * @param pos the offset to the first character of the partial value
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96 * to be retrieved. The first character in the Clob is at
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97 * position 1.
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98 * @param length the length in characters of the partial value to be
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99 * retrieved.
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100 * @return Reader through which the partial Clob value can be read.
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101 * @throws SQLException - if pos is less than 1
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102 * or if pos is greater than the number of characters in the Clob
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103 * or if pos + length is greater than the number of characters in the Clob
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104 */
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105 @Override
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106 public Reader getCharacterStream(long pos, long length) throws SQLException {
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107 checkBufIsNotNull();
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108 if (pos < 1 || pos > buf.length()) {
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109 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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110 }
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111 if (length < 0 || pos -1 + length > buf.length()) {
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112 throw new SQLException("Invalid length value: " + length, "M1M05");
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113 }
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114 return new StringReader(getSubString(pos, (int)length));
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115 }
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116
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117 /**
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118 * Retrieves a copy of the specified substring in the CLOB value
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119 * designated by this Clob object. The substring begins at
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120 * position pos and has up to length consecutive characters.
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121 *
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122 * @param pos the first character of the substring to be
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123 * extracted. The first character is at position 1.
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124 * @param length the number of consecutive characters to be copied
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125 * @return a String that is the specified substring in the
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126 * CLOB value designated by this Clob object
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127 * @throws SQLException - if pos is less than 1
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128 * or if pos is greater than the number of characters in the Clob
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129 * or if pos + length is greater than the number of characters in the Clob
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130 * @throws SQLException - if there is an error accessing the CLOB value
0
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131 */
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132 @Override
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133 public String getSubString(long pos, int length) throws SQLException {
147
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134 checkBufIsNotNull();
209
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135 if (pos < 1 || pos > buf.length()) {
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136 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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137 }
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138 if (length < 0 || pos -1 + length > buf.length()) {
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139 throw new SQLException("Invalid length value: " + length, "M1M05");
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140 }
0
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141 try {
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142 return buf.substring((int)(pos - 1), (int)(pos - 1 + length));
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143 } catch (IndexOutOfBoundsException e) {
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144 throw new SQLException(e.getMessage(), "M1M05");
0
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145 }
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146 }
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147
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148 /**
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149 * Retrieves the number of characters in the CLOB value designated
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150 * by this Clob object.
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151 *
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152 * @return length of the CLOB in characters
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153 * @throws SQLException if there is an error accessing the length
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154 * of the CLOB value
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155 */
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156 @Override
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157 public long length() throws SQLException {
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158 checkBufIsNotNull();
0
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159 return (long)buf.length();
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160 }
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161
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162 /**
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163 * Retrieves the character position at which the specified Clob
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164 * object searchstr appears in this Clob object. The search
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165 * begins at position start.
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166 *
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167 * @param searchstr the Clob object for which to search
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168 * @param start the position at which to begin searching;
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169 * the first position is 1
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170 * @return the position at which the Clob object appears or
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171 * -1 if it is not present; the first position is 1
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172 * @throws SQLException - if there is an error accessing the CLOB value
0
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173 */
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174 @Override
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175 public long position(Clob searchstr, long start) throws SQLException {
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176 if (searchstr == null) {
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177 throw new SQLException("Missing searchstr object", "M1M05");
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178 }
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179 return position(searchstr.toString(), start);
0
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180 }
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181
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182 /**
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183 * Retrieves the character position at which the specified
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184 * substring searchstr appears in the SQL CLOB value represented
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185 * by this Clob object. The search begins at position start.
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186 *
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187 * @param searchstr the substring for which to search
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188 * @param start the position at which to begin searching;
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189 * the first position is 1
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190 * @return the position at which the substring appears or
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191 * -1 if it is not present; the first position is 1
209
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192 * @throws SQLException - if there is an error accessing the CLOB value
0
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193 */
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194 @Override
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195 public long position(String searchstr, long start) throws SQLException {
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196 checkBufIsNotNull();
209
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197 if (searchstr == null) {
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198 throw new SQLException("Missing searchstr object", "M1M05");
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199 }
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200 if (start < 1 || start > buf.length()) {
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201 throw new SQLException("Invalid start value: " + start, "M1M05");
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202 }
0
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203 return (long)(buf.indexOf(searchstr, (int)(start - 1)));
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204 }
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205
209
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206 /**
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207 * Retrieves a stream to be used to write Ascii characters to the CLOB value that this
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208 * Clob object represents, starting at position pos. Characters written to the stream
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209 * will overwrite the existing characters in the Clob object starting at the position pos.
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210 * If the end of the Clob value is reached while writing characters to the stream,
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211 * then the length of the Clob value will be increased to accomodate the extra characters.
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212 *
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213 * Note: If the value specified for pos is greater then the length+1 of the CLOB value
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214 * then the behavior is undefined. Some JDBC drivers may throw a SQLException while
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215 * other drivers may support this operation.
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216 *
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217 * @param pos - the position at which to start writing to this CLOB object; The first position is 1
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218 * @return the stream to which ASCII encoded characters can be written
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219 * @throws SQLException - if there is an error accessing the CLOB value or if pos is less than 1
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220 * @throws SQLFeatureNotSupportedException - if the JDBC driver does not support this method
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221 */
0
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222 @Override
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223 public OutputStream setAsciiStream(long pos) throws SQLException {
149
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224 throw new SQLFeatureNotSupportedException("Method setAsciiStream(long pos) not supported", "0A000");
0
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225 }
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226
209
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227 /**
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228 * Retrieves a stream to be used to write a stream of Unicode characters to the CLOB value that
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229 * this Clob object represents, starting at position pos. Characters written to the stream
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230 * will overwrite the existing characters in the Clob object starting at the position pos.
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231 * If the end of the Clob value is reached while writing characters to the stream,
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232 * then the length of the Clob value will be increased to accomodate the extra characters.
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233 *
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234 * Note: If the value specified for pos is greater then the length+1 of the CLOB value
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235 * then the behavior is undefined. Some JDBC drivers may throw a SQLException while
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236 * other drivers may support this operation.
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237 *
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238 * @param pos - the position at which to start writing to this CLOB object; The first position is 1
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239 * @return the stream to which Unicode encoded characters can be written
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240 * @throws SQLException - if there is an error accessing the CLOB value or if pos is less than 1
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241 * @throws SQLFeatureNotSupportedException - if the JDBC driver does not support this method
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242 */
0
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243 @Override
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244 public Writer setCharacterStream(long pos) throws SQLException {
149
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245 throw new SQLFeatureNotSupportedException("Method setCharacterStream(long pos) not supported", "0A000");
0
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246 }
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247
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248 /**
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249 * Writes the given Java String to the CLOB value that this Clob object designates at the position pos.
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250 * The string will overwrite the existing characters in the Clob object starting at the position pos.
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251 * If the end of the Clob value is reached while writing the given string, then the length of
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252 * the Clob value will be increased to accomodate the extra characters.
0
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253 *
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254 * @param pos the position at which to start writing to the
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255 * CLOB value that this Clob object represents
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256 * @param str the string to be written to the CLOB value that
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257 * this Clob designates
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258 * @return the number of characters written
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259 * @throws SQLException if there is an error accessing the
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260 * CLOB value or if pos is less than 1
0
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261 */
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262 @Override
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263 public int setString(long pos, String str) throws SQLException {
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264 if (str == null) {
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265 throw new SQLException("Missing str object", "M1M05");
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266 }
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267 return setString(pos, str, 0, str.length());
0
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268 }
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269
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270 /**
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271 * Writes len characters of str, starting at character offset, to the CLOB value that this Clob represents.
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272 * The string will overwrite the existing characters in the Clob object starting at the position pos.
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273 * If the end of the Clob value is reached while writing the given string, then the length of
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274 * the Clob value will be increased to accomodate the extra characters.
0
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275 *
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276 * @param pos the position at which to start writing to this
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277 * CLOB object
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278 * @param str the string to be written to the CLOB value that
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279 * this Clob object represents
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280 * @param offset the offset into str to start reading the
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281 * characters to be written
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282 * @param len the number of characters to be written
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283 * @return the number of characters written
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284 * @throws SQLException if there is an error accessing the
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285 * CLOB value or if pos is less than 1
0
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286 */
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287 @Override
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288 public int setString(long pos, String str, int offset, int len)
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289 throws SQLException
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290 {
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291 checkBufIsNotNull();
209
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292 if (str == null) {
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293 throw new SQLException("Missing str object", "M1M05");
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294 }
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295 if (pos < 1 || pos > Integer.MAX_VALUE) {
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296 throw new SQLException("Invalid pos value: " + pos, "M1M05");
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297 }
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298 if (offset < 0 || offset > str.length()) {
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299 throw new SQLException("Invalid offset value: " + offset, "M1M05");
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300 }
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301 if (len < 1 || (offset + len) > str.length()) {
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302 throw new SQLException("Invalid len value: " + len, "M1M05");
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303 }
0
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304
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305 int ipos = (int) pos;
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306 if ((ipos + len) > buf.capacity()) {
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307 buf.ensureCapacity(ipos + len);
0
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308 }
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309 buf.replace(ipos - 1, ipos + len, str.substring(offset, (offset + len)));
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310 return len;
0
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311 }
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312
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313 /**
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314 * Truncates the CLOB value that this Clob designates to
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315 * have a length of len characters.
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316 *
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317 * @param len the length, in bytes, to which the CLOB value
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318 * should be truncated
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319 * @throws SQLException if there is an error accessing the
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320 * CLOB value or if len is less than 0
0
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321 */
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322 @Override
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323 public void truncate(long len) throws SQLException {
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324 checkBufIsNotNull();
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325 if (len < 0 || len > buf.length()) {
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326 throw new SQLException("Invalid len value: " + len, "M1M05");
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327 }
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328 buf.delete((int)len, buf.length());
0
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329 }
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330
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331
0
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332 /**
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333 * Returns the String behind this Clob. This is a MonetClob
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334 * extension that does not violate nor is described in the Clob
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335 * interface.
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336 *
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337 * @return the String this Clob wraps or "null" when this Clob is freed.
0
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338 */
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339 public String toString() {
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340 return (buf == null) ? "null" : buf.toString();
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341 }
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342 }