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annotate src/main/java/nl/cwi/monetdb/jdbc/MonetClob.java @ 147:ad0fe5b04fd4

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Improve MonetClob implementatin.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 10 Aug 2017 18:56:45 +0200 (2017-08-10)
parents b9b35ca2eec2
children 1e49fc74dba4
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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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e092fa8d9ab7 Expand import java.*.* statements
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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;
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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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38 /* internal utility method */
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39 private void checkBufIsNotNull() throws SQLException {
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40 if (buf == null)
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41 throw new SQLException("This Clob has been freed", "M1M20");
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42 }
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43
0
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44 //== begin interface Clob
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45
0
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46 /**
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47 * This method frees the Clob object and releases the resources the
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48 * resources that it holds. The object is invalid once the free
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49 * method is called.
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50 *
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51 * After free has been called, any attempt to invoke a method other
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52 * than free will result in a SQLException being thrown. If free is
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53 * called multiple times, the subsequent calls to free are treated
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54 * as a no-op.
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55 */
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56 @Override
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57 public void free() {
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58 buf = null;
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59 }
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60
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61 /**
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62 * Retrieves the CLOB value designated by this Clob object as an
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63 * ascii stream.
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64 *
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65 * @return a java.io.InputStream object containing the CLOB data
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66 * @throws SQLFeatureNotSupportedException this JDBC driver does
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67 * not support this method
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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 throw new SQLFeatureNotSupportedException("Method getAsciiStream() currently not supported", "0A000");
0
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72 }
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73
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74 /**
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75 * Retrieves the CLOB value designated by this Clob object as a
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76 * java.io.Reader object (or as a stream of characters).
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77 *
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78 * @return a java.io.Reader object containing the CLOB data
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79 * @throws SQLFeatureNotSupportedException this JDBC driver does
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80 * not support this method
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81 */
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82 @Override
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83 public Reader getCharacterStream() throws SQLException {
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84 throw new SQLFeatureNotSupportedException("Method getCharacterStream() currently not supported", "0A000");
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85 }
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86
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87 /**
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88 * Returns a Reader object that contains a partial Clob value,
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89 * starting with the character specified by pos, which is length
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90 * characters in length.
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91 *
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92 * @param pos the offset to the first character of the partial value
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93 * to be retrieved. The first character in the Clob is at
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94 * position 1.
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95 * @param length the length in characters of the partial value to be
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96 * retrieved.
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97 * @return Reader through which the partial Clob value can be read.
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98 * @throws SQLFeatureNotSupportedException this JDBC driver does
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99 * not support this method
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100 */
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101 @Override
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102 public Reader getCharacterStream(long pos, long length) throws SQLException {
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103 throw new SQLFeatureNotSupportedException("Method getCharacterStream(long, long) currently not supported", "0A000");
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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
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108 * designated by this Clob object. The substring begins at
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109 * position pos and has up to length consecutive characters.
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110 *
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111 * @param pos the first character of the substring to be
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112 * extracted. The first character is at position 1.
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113 * @param length the number of consecutive characters to be copied
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114 * @return a String that is the specified substring in the
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115 * CLOB value designated by this Clob object
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116 * @throws SQLException if there is an error accessing the
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117 * CLOB value
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118 */
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119 @Override
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120 public String getSubString(long pos, int length) throws SQLException {
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121 checkBufIsNotNull();
0
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122 try {
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123 return buf.substring((int)(pos - 1), (int)(pos - 1 + length));
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124 } catch (IndexOutOfBoundsException e) {
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125 throw new SQLException(e.getMessage());
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126 }
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127 }
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128
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129 /**
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130 * Retrieves the number of characters in the CLOB value designated
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131 * by this Clob object.
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132 *
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133 * @return length of the CLOB in characters
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134 * @throws SQLException if there is an error accessing the length
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135 * of the CLOB value
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136 */
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137 @Override
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138 public long length() throws SQLException {
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139 checkBufIsNotNull();
0
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140 return (long)buf.length();
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141 }
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142
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143 /**
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144 * Retrieves the character position at which the specified Clob
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145 * object searchstr appears in this Clob object. The search
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146 * begins at position start.
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147 *
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148 * @param searchstr the Clob object for which to search
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149 * @param start the position at which to begin searching;
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150 * the first position is 1
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151 * @return the position at which the Clob object appears or
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152 * -1 if it is not present; the first position is 1
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153 * @throws SQLException if there is an error accessing the
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154 * CLOB value
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155 */
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156 @Override
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157 public long position(Clob searchstr, long start) throws SQLException {
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158 return position(searchstr.getSubString(1L, (int)(searchstr.length())), start);
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159 }
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160
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161 /**
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162 * Retrieves the character position at which the specified
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163 * substring searchstr appears in the SQL CLOB value represented
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164 * by this Clob object. The search begins at position start.
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165 *
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166 * @param searchstr the substring for which to search
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167 * @param start the position at which to begin searching;
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168 * the first position is 1
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169 * @return the position at which the substring appears or
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170 * -1 if it is not present; the first position is 1
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171 * @throws SQLException if there is an error accessing the
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172 * CLOB value
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173 */
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174 @Override
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175 public long position(String searchstr, long start) throws SQLException {
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176 checkBufIsNotNull();
0
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177 return (long)(buf.indexOf(searchstr, (int)(start - 1)));
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178 }
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179
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180 @Override
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181 public OutputStream setAsciiStream(long pos) throws SQLException {
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182 throw new SQLException("Method setAsciiStream(long pos) currently not supported", "0A000");
0
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183 }
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184
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185 @Override
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186 public Writer setCharacterStream(long pos) throws SQLException {
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187 throw new SQLException("Method setCharacterStream(long pos) currently not supported", "0A000");
0
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188 }
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189
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190 /**
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191 * Writes the given Java String to the CLOB value that this
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192 * Clob object designates at the position pos.
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193 *
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194 * @param pos the position at which to start writing to the
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195 * CLOB value that this Clob object represents
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196 * @param str the string to be written to the CLOB value that
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197 * this Clob designates
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198 * @return the number of characters written
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199 * @throws SQLException if there is an error accessing the
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200 * CLOB value
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201 */
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202 @Override
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203 public int setString(long pos, String str) throws SQLException {
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204 return setString(pos, str, 1, str.length());
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205 }
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206
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207 /**
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208 * Writes len characters of str, starting at character offset,
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209 * to the CLOB value that this Clob represents.
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210 *
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211 * @param pos the position at which to start writing to this
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212 * CLOB object
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213 * @param str the string to be written to the CLOB value that
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214 * this Clob object represents
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215 * @param offset the offset into str to start reading the
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216 * characters to be written
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217 * @param len the number of characters to be written
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218 * @return the number of characters written
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219 * @throws SQLException if there is an error accessing the
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220 * CLOB value
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221 */
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222 @Override
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223 public int setString(long pos, String str, int offset, int len)
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224 throws SQLException
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225 {
147
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226 checkBufIsNotNull();
0
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227
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228 int buflen = buf.length();
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229 int retlen = Math.min(buflen, (int)(pos - 1 + len));
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230 if (retlen > 0) {
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231 buf.replace((int)(pos - 1), (int)(pos + retlen), str.substring(offset - 1, (offset + len)));
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232 return retlen;
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233 } else {
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234 return 0;
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235 }
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236 }
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237
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238 /**
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239 * Truncates the CLOB value that this Clob designates to
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240 * have a length of len characters.
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241 *
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242 * @param len the length, in bytes, to which the CLOB value
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243 * should be truncated
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244 * @throws SQLException if there is an error accessing the
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245 * CLOB value
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246 */
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247 @Override
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248 public void truncate(long len) throws SQLException {
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249 checkBufIsNotNull();
0
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250 // this command is a no-op
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251 }
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252
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253 /**
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254 * Returns the String behind this Clob. This is a MonetClob
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255 * extension that does not violate nor is described in the Clob
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256 * interface.
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257 *
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258 * @return the String this Clob wraps.
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259 */
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260 @Override
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261 public String toString() {
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262 return (buf == null) ? "null" : buf.toString();
0
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263 }
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264 }