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Copy of MonetDB java directory changeset e6e32756ad31.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 21 Sep 2016 09:34:48 +0200 (2016-09-21)
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children 7e0d71a22677 e092fa8d9ab7
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1 /*
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2 * This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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5 *
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2016 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.sql.*;
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12 import java.io.*;
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13
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14 /**
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15 * The MonetClob class implements the {@link java.sql.Clob} interface. Because
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16 * MonetDB/SQL currently has no support for streams, this class is a
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17 * shallow wrapper of a {@link StringBuilder}. It is more or less supplied to
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18 * enable an application that depends on it to run. It may be obvious
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19 * that it is a real resource expensive workaround that contradicts the
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20 * sole reason for a Clob: avoidance of huge resource consumption.
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21 * <b>Use of this class is highly discouraged.</b>
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22 *
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23 * @author Fabian Groffen
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24 */
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25 public class MonetClob implements Clob {
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26
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27 private StringBuilder buf;
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28
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29 protected MonetClob(String in) {
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30 buf = new StringBuilder(in);
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31 }
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32
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33 //== begin interface Clob
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34
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35 /**
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36 * This method frees the Clob object and releases the resources the
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37 * resources that it holds. The object is invalid once the free
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38 * method is called.
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39 *
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40 * After free has been called, any attempt to invoke a method other
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41 * than free will result in a SQLException being thrown. If free is
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42 * called multiple times, the subsequent calls to free are treated
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43 * as a no-op.
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44 */
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45 @Override
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46 public void free() {
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47 buf = null;
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48 }
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49
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50 /**
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51 * Retrieves the CLOB value designated by this Clob object as an
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52 * ascii stream.
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53 *
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54 * @return a java.io.InputStream object containing the CLOB data
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55 * @throws SQLFeatureNotSupportedException this JDBC driver does
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56 * not support this method
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57 */
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58 @Override
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59 public InputStream getAsciiStream() throws SQLException {
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60 throw new SQLFeatureNotSupportedException("Operation getAsciiStream() currently not supported", "0A000");
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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 a
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65 * java.io.Reader object (or as a stream of characters).
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66 *
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67 * @return a java.io.Reader object containing the CLOB data
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68 * @throws SQLFeatureNotSupportedException this JDBC driver does
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69 * not support this method
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70 */
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71 @Override
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72 public Reader getCharacterStream() throws SQLException {
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73 throw new SQLFeatureNotSupportedException("Operation getCharacterStream() currently not supported", "0A000");
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74 }
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75
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76 /**
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77 * Returns a Reader object that contains a partial Clob value,
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78 * starting with the character specified by pos, which is length
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79 * characters in length.
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80 *
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81 * @param pos the offset to the first character of the partial value
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82 * to be retrieved. The first character in the Clob is at
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83 * position 1.
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84 * @param length the length in characters of the partial value to be
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85 * retrieved.
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86 * @return Reader through which the partial Clob value can be read.
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87 * @throws SQLFeatureNotSupportedException this JDBC driver does
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88 * not support this method
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89 */
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90 @Override
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91 public Reader getCharacterStream(long pos, long length) throws SQLException {
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92 throw new SQLFeatureNotSupportedException("Operation getCharacterStream(long, long) currently not supported", "0A000");
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93 }
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94
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95 /**
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96 * Retrieves a copy of the specified substring in the CLOB value
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97 * designated by this Clob object. The substring begins at
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98 * position pos and has up to length consecutive characters.
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99 *
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100 * @param pos the first character of the substring to be
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101 * extracted. The first character is at position 1.
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102 * @param length the number of consecutive characters to be copied
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103 * @return a String that is the specified substring in the
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104 * CLOB value designated by this Clob object
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105 * @throws SQLException if there is an error accessing the
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106 * CLOB value
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107 */
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108 @Override
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109 public String getSubString(long pos, int length) throws SQLException {
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110 if (buf == null)
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111 throw new SQLException("This Clob has been freed", "M1M20");
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112 try {
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113 return buf.substring((int)(pos - 1), (int)(pos - 1 + length));
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114 } catch (IndexOutOfBoundsException e) {
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115 throw new SQLException(e.getMessage());
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116 }
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117 }
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118
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119 /**
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120 * Retrieves the number of characters in the CLOB value designated
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121 * by this Clob object.
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122 *
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123 * @return length of the CLOB in characters
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124 * @throws SQLException if there is an error accessing the length
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125 * of the CLOB value
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126 */
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127 @Override
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128 public long length() throws SQLException {
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129 if (buf == null)
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130 throw new SQLException("This Clob has been freed", "M1M20");
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131 return (long)buf.length();
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132 }
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133
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134 /**
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135 * Retrieves the character position at which the specified Clob
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136 * object searchstr appears in this Clob object. The search
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137 * begins at position start.
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138 *
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139 * @param searchstr the Clob object for which to search
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140 * @param start the position at which to begin searching;
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141 * the first position is 1
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142 * @return the position at which the Clob object appears or
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143 * -1 if it is not present; the first position is 1
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144 * @throws SQLException if there is an error accessing the
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145 * CLOB value
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146 */
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147 @Override
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148 public long position(Clob searchstr, long start) throws SQLException {
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149 return position(searchstr.getSubString(1L, (int)(searchstr.length())), start);
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150 }
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151
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152 /**
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153 * Retrieves the character position at which the specified
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154 * substring searchstr appears in the SQL CLOB value represented
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155 * by this Clob object. The search begins at position start.
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156 *
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157 * @param searchstr the substring for which to search
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158 * @param start the position at which to begin searching;
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159 * the first position is 1
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160 * @return the position at which the substring appears or
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161 * -1 if it is not present; the first position is 1
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162 * @throws SQLException if there is an error accessing the
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163 * CLOB value
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164 */
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165 @Override
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166 public long position(String searchstr, long start) throws SQLException {
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167 if (buf == null)
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168 throw new SQLException("This Clob has been freed", "M1M20");
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169 return (long)(buf.indexOf(searchstr, (int)(start - 1)));
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170 }
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171
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172 @Override
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173 public OutputStream setAsciiStream(long pos) throws SQLException {
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174 if (buf == null)
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175 throw new SQLException("This Clob has been freed", "M1M20");
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176 throw new SQLException("Operation setAsciiStream(long pos) currently not supported", "0A000");
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177 }
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178
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179 @Override
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180 public Writer setCharacterStream(long pos) throws SQLException {
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181 if (buf == null)
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182 throw new SQLException("This Clob has been freed", "M1M20");
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183 throw new SQLException("Operation setCharacterStream(long pos) currently not supported", "0A000");
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184 }
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185
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186 /**
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187 * Writes the given Java String to the CLOB value that this
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188 * Clob object designates at the position pos.
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189 *
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190 * @param pos the position at which to start writing to the
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191 * CLOB value that this Clob object represents
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192 * @param str the string to be written to the CLOB value that
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193 * this Clob designates
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194 * @return the number of characters written
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195 * @throws SQLException if there is an error accessing the
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196 * CLOB value
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197 */
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198 @Override
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199 public int setString(long pos, String str) throws SQLException {
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200 return setString(pos, str, 1, str.length());
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201 }
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202
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203 /**
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204 * Writes len characters of str, starting at character offset,
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205 * to the CLOB value that this Clob represents.
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206 *
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207 * @param pos the position at which to start writing to this
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208 * CLOB object
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209 * @param str the string to be written to the CLOB value that
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210 * this Clob object represents
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211 * @param offset the offset into str to start reading the
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212 * characters to be written
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213 * @param len the number of characters to be written
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214 * @return the number of characters written
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215 * @throws SQLException if there is an error accessing the
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216 * CLOB value
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217 */
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218 @Override
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219 public int setString(long pos, String str, int offset, int len)
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220 throws SQLException
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221 {
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222 if (buf == null)
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223 throw new SQLException("This Clob has been freed", "M1M20");
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224
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225 int buflen = buf.length();
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226 int retlen = Math.min(buflen, (int)(pos - 1 + len));
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227
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228 if (retlen > 0) {
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229 buf.replace((int)(pos - 1), (int)(pos + retlen), str.substring(offset - 1, (offset + len)));
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230 return retlen;
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231 } else {
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232 return 0;
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233 }
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234 }
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235
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236 /**
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237 * Truncates the CLOB value that this Clob designates to
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238 * have a length of len characters.
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239 *
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240 * @param len the length, in bytes, to which the CLOB value
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241 * should be truncated
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242 * @throws SQLException if there is an error accessing the
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243 * CLOB value
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244 */
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245 @Override
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246 public void truncate(long len) throws SQLException {
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247 if (buf == null)
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248 throw new SQLException("This Clob has been freed", "M1M20");
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249 // this command is a no-op
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250 }
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251
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252 /**
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253 * Returns the String behind this Clob. This is a MonetClob
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254 * extension that does not violate nor is described in the Clob
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255 * interface.
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256 *
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257 * @return the String this Clob wraps.
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258 */
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259 @Override
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260 public String toString() {
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261 if (buf == null)
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262 return "<a freed MonetClob instance>";
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263 return buf.toString();
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264 }
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265 }