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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package javax.sql.rowset.serial; | ||
| 27 | |||
| 28 | import java.sql.*; | ||
| 29 | import java.io.*; | ||
| 30 | |||
| 31 | /** | ||
| 32 | * A serialized mapping in the Java programming language of an SQL | ||
| 33 | * <code>CLOB</code> value. | ||
| 34 | * <P> | ||
| 35 | * The <code>SerialClob</code> class provides a constructor for creating | ||
| 36 | * an instance from a <code>Clob</code> object. Note that the <code>Clob</code> | ||
| 37 | * object should have brought the SQL <code>CLOB</code> value's data over | ||
| 38 | * to the client before a <code>SerialClob</code> object | ||
| 39 | * is constructed from it. The data of an SQL <code>CLOB</code> value can | ||
| 40 | * be materialized on the client as a stream of Unicode characters. | ||
| 41 | * <P> | ||
| 42 | * <code>SerialClob</code> methods make it possible to get a substring | ||
| 43 | * from a <code>SerialClob</code> object or to locate the start of | ||
| 44 | * a pattern of characters. | ||
| 45 | * | ||
| 46 | * @author Jonathan Bruce | ||
| 47 | */ | ||
| 48 | public class SerialClob implements Clob, Serializable, Cloneable { | ||
| 49 | |||
| 50 | /** | ||
| 51 | * A serialized array of characters containing the data of the SQL | ||
| 52 | * <code>CLOB</code> value that this <code>SerialClob</code> object | ||
| 53 | * represents. | ||
| 54 | * | ||
| 55 | * @serial | ||
| 56 | */ | ||
| 57 | private char buf[]; | ||
| 58 | |||
| 59 | /** | ||
| 60 | * Internal Clob representation if SerialClob is initialized with a | ||
| 61 | * Clob. Null if SerialClob is initialized with a char[]. | ||
| 62 | */ | ||
| 63 | private final Clob clob; | ||
| 64 | |||
| 65 | /** | ||
| 66 | * The length in characters of this <code>SerialClob</code> object's | ||
| 67 | * internal array of characters. | ||
| 68 | * | ||
| 69 | * @serial | ||
| 70 | */ | ||
| 71 | private long len; | ||
| 72 | |||
| 73 | /** | ||
| 74 | * The original length in characters of this <code>SerialClob</code> | ||
| 75 | * object's internal array of characters. | ||
| 76 | * | ||
| 77 | * @serial | ||
| 78 | */ | ||
| 79 | private final long origLen; | ||
| 80 | |||
| 81 | /** | ||
| 82 | * Constructs a <code>SerialClob</code> object that is a serialized version of | ||
| 83 | * the given <code>char</code> array. | ||
| 84 | * <p> | ||
| 85 | * The new <code>SerialClob</code> object is initialized with the data from the | ||
| 86 | * <code>char</code> array, thus allowing disconnected <code>RowSet</code> | ||
| 87 | * objects to establish a serialized <code>Clob</code> object without touching | ||
| 88 | * the data source. | ||
| 89 | * | ||
| 90 | * @param ch the char array representing the <code>Clob</code> object to be | ||
| 91 | * serialized | ||
| 92 | * @throws SerialException if an error occurs during serialization | ||
| 93 | * @throws SQLException if a SQL error occurs | ||
| 94 | */ | ||
| 95 | public SerialClob(char ch[]) throws SerialException, SQLException { | ||
| 96 | |||
| 97 | // %%% JMB. Agreed. Add code here to throw a SQLException if no | ||
| 98 | // support is available for locatorsUpdateCopy=false | ||
| 99 | // Serializing locators is not supported. | ||
| 100 | |||
| 101 | len = ch.length; | ||
| 102 | buf = new char[(int)len]; | ||
| 103 | for (int i = 0; i < len ; i++){ | ||
| 104 | buf[i] = ch[i]; | ||
| 105 | } | ||
| 106 | origLen = len; | ||
| 107 | clob = null; | ||
| 108 | } | ||
| 109 | |||
| 110 | /** | ||
| 111 | * Constructs a <code>SerialClob</code> object that is a serialized | ||
| 112 | * version of the given <code>Clob</code> object. | ||
| 113 | * <P> | ||
| 114 | * The new <code>SerialClob</code> object is initialized with the | ||
| 115 | * data from the <code>Clob</code> object; therefore, the | ||
| 116 | * <code>Clob</code> object should have previously brought the | ||
| 117 | * SQL <code>CLOB</code> value's data over to the client from | ||
| 118 | * the database. Otherwise, the new <code>SerialClob</code> object | ||
| 119 | * object will contain no data. | ||
| 120 | * <p> | ||
| 121 | * Note: The <code>Clob</code> object supplied to this constructor must | ||
| 122 | * return non-null for both the <code>Clob.getCharacterStream()</code> | ||
| 123 | * and <code>Clob.getAsciiStream</code> methods. This <code>SerialClob</code> | ||
| 124 | * constructor cannot serialize a <code>Clob</code> object in this instance | ||
| 125 | * and will throw an <code>SQLException</code> object. | ||
| 126 | * | ||
| 127 | * @param clob the <code>Clob</code> object from which this | ||
| 128 | * <code>SerialClob</code> object is to be constructed; cannot be null | ||
| 129 | * @throws SerialException if an error occurs during serialization | ||
| 130 | * @throws SQLException if a SQL error occurs in capturing the CLOB; | ||
| 131 | * if the <code>Clob</code> object is a null; or if either of the | ||
| 132 | * <code>Clob.getCharacterStream()</code> and <code>Clob.getAsciiStream()</code> | ||
| 133 | * methods on the <code>Clob</code> returns a null | ||
| 134 | * @see java.sql.Clob | ||
| 135 | */ | ||
| 136 | public SerialClob(Clob clob) throws SerialException, SQLException { | ||
| 137 | |||
| 138 | if (clob == null) { | ||
| 139 | throw new SQLException("Cannot instantiate a SerialClob " + | ||
| 140 | "object with a null Clob object"); | ||
| 141 | } | ||
| 142 | len = clob.length(); | ||
| 143 | this.clob = clob; | ||
| 144 | buf = new char[(int)len]; | ||
| 145 | int read = 0; | ||
| 146 | int offset = 0; | ||
| 147 | |||
| 148 | try (Reader charStream = clob.getCharacterStream()) { | ||
| 149 | if (charStream == null) { | ||
| 150 | throw new SQLException("Invalid Clob object. The call to getCharacterStream " + | ||
| 151 | "returned null which cannot be serialized."); | ||
| 152 | } | ||
| 153 | |||
| 154 | // Note: get an ASCII stream in order to null-check it, | ||
| 155 | // even though we don't do anything with it. | ||
| 156 | try (InputStream asciiStream = clob.getAsciiStream()) { | ||
| 157 | if (asciiStream == null) { | ||
| 158 | throw new SQLException("Invalid Clob object. The call to getAsciiStream " + | ||
| 159 | "returned null which cannot be serialized."); | ||
| 160 | } | ||
| 161 | } | ||
| 162 | |||
| 163 | try (Reader reader = new BufferedReader(charStream)) { | ||
| 164 | do { | ||
| 165 | read = reader.read(buf, offset, (int)(len - offset)); | ||
| 166 | offset += read; | ||
| 167 | } while (read > 0); | ||
| 168 | } | ||
| 169 | } catch (java.io.IOException ex) { | ||
| 170 | throw new SerialException("SerialClob: " + ex.getMessage()); | ||
| 171 | } | ||
| 172 | |||
| 173 | origLen = len; | ||
| 174 | } | ||
| 175 | |||
| 176 | /** | ||
| 177 | * Retrieves the number of characters in this <code>SerialClob</code> | ||
| 178 | * object's array of characters. | ||
| 179 | * | ||
| 180 | * @return a <code>long</code> indicating the length in characters of this | ||
| 181 | * <code>SerialClob</code> object's array of character | ||
| 182 | * @throws SerialException if an error occurs | ||
| 183 | */ | ||
| 184 | public long length() throws SerialException { | ||
| 185 | return len; | ||
| 186 | } | ||
| 187 | |||
| 188 | /** | ||
| 189 | * Returns this <code>SerialClob</code> object's data as a stream | ||
| 190 | * of Unicode characters. Unlike the related method, <code>getAsciiStream</code>, | ||
| 191 | * a stream is produced regardless of whether the <code>SerialClob</code> object | ||
| 192 | * was created with a <code>Clob</code> object or a <code>char</code> array. | ||
| 193 | * | ||
| 194 | * @return a <code>java.io.Reader</code> object containing this | ||
| 195 | * <code>SerialClob</code> object's data | ||
| 196 | * @throws SerialException if an error occurs | ||
| 197 | */ | ||
| 198 | public java.io.Reader getCharacterStream() throws SerialException { | ||
| 199 | return (java.io.Reader) new CharArrayReader(buf); | ||
| 200 | } | ||
| 201 | |||
| 202 | /** | ||
| 203 | * Retrieves the <code>CLOB</code> value designated by this <code>SerialClob</code> | ||
| 204 | * object as an ascii stream. This method forwards the <code>getAsciiStream</code> | ||
| 205 | * call to the underlying <code>Clob</code> object in the event that this | ||
| 206 | * <code>SerialClob</code> object is instantiated with a <code>Clob</code> | ||
| 207 | * object. If this <code>SerialClob</code> object is instantiated with | ||
| 208 | * a <code>char</code> array, a <code>SerialException</code> object is thrown. | ||
| 209 | * | ||
| 210 | * @return a <code>java.io.InputStream</code> object containing | ||
| 211 | * this <code>SerialClob</code> object's data | ||
| 212 | * @throws SerialException if this <code>SerialClob</code> object was not instantiated | ||
| 213 | * with a <code>Clob</code> object | ||
| 214 | * @throws SQLException if there is an error accessing the | ||
| 215 | * <code>CLOB</code> value represented by the <code>Clob</code> object that was | ||
| 216 | * used to create this <code>SerialClob</code> object | ||
| 217 | */ | ||
| 218 | public java.io.InputStream getAsciiStream() throws SerialException, SQLException { | ||
| 219 | if (this.clob != null) { | ||
| 220 | return this.clob.getAsciiStream(); | ||
| 221 | } else { | ||
| 222 | throw new SerialException("Unsupported operation. SerialClob cannot " + | ||
| 223 | "return a the CLOB value as an ascii stream, unless instantiated " + | ||
| 224 | "with a fully implemented Clob object."); | ||
| 225 | } | ||
| 226 | } | ||
| 227 | |||
| 228 | /** | ||
| 229 | * Returns a copy of the substring contained in this | ||
| 230 | * <code>SerialClob</code> object, starting at the given position | ||
| 231 | * and continuing for the specified number or characters. | ||
| 232 | * | ||
| 233 | * @param pos the position of the first character in the substring | ||
| 234 | * to be copied; the first character of the | ||
| 235 | * <code>SerialClob</code> object is at position | ||
| 236 | * <code>1</code>; must not be less than <code>1</code>, | ||
| 237 | * and the sum of the starting position and the length | ||
| 238 | * of the substring must be less than the length of this | ||
| 239 | * <code>SerialClob</code> object | ||
| 240 | * @param length the number of characters in the substring to be | ||
| 241 | * returned; must not be greater than the length of | ||
| 242 | * this <code>SerialClob</code> object, and the | ||
| 243 | * sum of the starting position and the length | ||
| 244 | * of the substring must be less than the length of this | ||
| 245 | * <code>SerialClob</code> object | ||
| 246 | * @return a <code>String</code> object containing a substring of | ||
| 247 | * this <code>SerialClob</code> object beginning at the | ||
| 248 | * given position and containing the specified number of | ||
| 249 | * consecutive characters | ||
| 250 | * @throws SerialException if either of the arguments is out of bounds | ||
| 251 | */ | ||
| 252 | public String getSubString(long pos, int length) throws SerialException { | ||
| 253 | |||
| 254 | if (pos < 1 || pos > this.length()) { | ||
| 255 | throw new SerialException("Invalid position in BLOB object set"); | ||
| 256 | } | ||
| 257 | |||
| 258 | if ((pos-1) + length > this.length()) { | ||
| 259 | throw new SerialException("Invalid position and substring length"); | ||
| 260 | } | ||
| 261 | |||
| 262 | try { | ||
| 263 | return new String(buf, (int)pos - 1, length); | ||
| 264 | |||
| 265 | } catch (StringIndexOutOfBoundsException e) { | ||
| 266 | throw new SerialException("StringIndexOutOfBoundsException: " + | ||
| 267 | e.getMessage()); | ||
| 268 | } | ||
| 269 | |||
| 270 | } | ||
| 271 | |||
| 272 | /** | ||
| 273 | * Returns the position in this <code>SerialClob</code> object | ||
| 274 | * where the given <code>String</code> object begins, starting | ||
| 275 | * the search at the specified position. This method returns | ||
| 276 | * <code>-1</code> if the pattern is not found. | ||
| 277 | * | ||
| 278 | * @param searchStr the <code>String</code> object for which to | ||
| 279 | * search | ||
| 280 | * @param start the position in this <code>SerialClob</code> object | ||
| 281 | * at which to start the search; the first position is | ||
| 282 | * <code>1</code>; must not be less than <code>1</code> nor | ||
| 283 | * greater than the length of this <code>SerialClob</code> object | ||
| 284 | * @return the position at which the given <code>String</code> object | ||
| 285 | * begins, starting the search at the specified position; | ||
| 286 | * <code>-1</code> if the given <code>String</code> object is | ||
| 287 | * not found or the starting position is out of bounds; position | ||
| 288 | * numbering for the return value starts at <code>1</code> | ||
| 289 | * @throws SerialException if an error occurs locating the String signature | ||
| 290 | * @throws SQLException if there is an error accessing the Blob value | ||
| 291 | * from the database. | ||
| 292 | */ | ||
| 293 | public long position(String searchStr, long start) | ||
| 294 | throws SerialException, SQLException { | ||
| 295 | |||
| 296 | if (start < 1 || start > len) { | ||
| 297 | return -1; | ||
| 298 | } | ||
| 299 | |||
| 300 | char pattern[] = searchStr.toCharArray(); | ||
| 301 | |||
| 302 | int pos = (int)start-1; | ||
| 303 | int i = 0; | ||
| 304 | long patlen = pattern.length; | ||
| 305 | |||
| 306 | while (pos < len) { | ||
| 307 | if (pattern[i] == buf[pos]) { | ||
| 308 | if (i + 1 == patlen) { | ||
| 309 | return (pos + 1) - (patlen - 1); | ||
| 310 | } | ||
| 311 | i++; pos++; // increment pos, and i | ||
| 312 | |||
| 313 | } else if (pattern[i] != buf[pos]) { | ||
| 314 | pos++; // increment pos only | ||
| 315 | } | ||
| 316 | } | ||
| 317 | return -1; // not found | ||
| 318 | } | ||
| 319 | |||
| 320 | /** | ||
| 321 | * Returns the position in this <code>SerialClob</code> object | ||
| 322 | * where the given <code>Clob</code> signature begins, starting | ||
| 323 | * the search at the specified position. This method returns | ||
| 324 | * <code>-1</code> if the pattern is not found. | ||
| 325 | * | ||
| 326 | * @param searchStr the <code>Clob</code> object for which to search | ||
| 327 | * @param start the position in this <code>SerialClob</code> object | ||
| 328 | * at which to begin the search; the first position is | ||
| 329 | * <code>1</code>; must not be less than <code>1</code> nor | ||
| 330 | * greater than the length of this <code>SerialClob</code> object | ||
| 331 | * @return the position at which the given <code>Clob</code> | ||
| 332 | * object begins in this <code>SerialClob</code> object, | ||
| 333 | * at or after the specified starting position | ||
| 334 | * @throws SerialException if an error occurs locating the Clob signature | ||
| 335 | * @throws SQLException if there is an error accessing the Blob value | ||
| 336 | * from the database | ||
| 337 | */ | ||
| 338 | public long position(Clob searchStr, long start) | ||
| 339 | throws SerialException, SQLException { | ||
| 340 | |||
| 341 | return position(searchStr.getSubString(1,(int)searchStr.length()), start); | ||
| 342 | } | ||
| 343 | |||
| 344 | /** | ||
| 345 | * Writes the given Java <code>String</code> to the <code>CLOB</code> | ||
| 346 | * value that this <code>SerialClob</code> object represents, at the position | ||
| 347 | * <code>pos</code>. | ||
| 348 | * | ||
| 349 | * @param pos the position at which to start writing to the <code>CLOB</code> | ||
| 350 | * value that this <code>SerialClob</code> object represents; the first | ||
| 351 | * position is <code>1</code>; must not be less than <code>1</code> nor | ||
| 352 | * greater than the length of this <code>SerialClob</code> object | ||
| 353 | * @param str the string to be written to the <code>CLOB</code> | ||
| 354 | * value that this <code>SerialClob</code> object represents | ||
| 355 | * @return the number of characters written | ||
| 356 | * @throws SerialException if there is an error accessing the | ||
| 357 | * <code>CLOB</code> value; if an invalid position is set; if an | ||
| 358 | * invalid offset value is set; if number of bytes to be written | ||
| 359 | * is greater than the <code>SerialClob</code> length; or the combined | ||
| 360 | * values of the length and offset is greater than the Clob buffer | ||
| 361 | */ | ||
| 362 | public int setString(long pos, String str) throws SerialException { | ||
| 363 | return (setString(pos, str, 0, str.length())); | ||
| 364 | } | ||
| 365 | |||
| 366 | /** | ||
| 367 | * Writes <code>len</code> characters of <code>str</code>, starting | ||
| 368 | * at character <code>offset</code>, to the <code>CLOB</code> value | ||
| 369 | * that this <code>Clob</code> represents. | ||
| 370 | * | ||
| 371 | * @param pos the position at which to start writing to the <code>CLOB</code> | ||
| 372 | * value that this <code>SerialClob</code> object represents; the first | ||
| 373 | * position is <code>1</code>; must not be less than <code>1</code> nor | ||
| 374 | * greater than the length of this <code>SerialClob</code> object | ||
| 375 | * @param str the string to be written to the <code>CLOB</code> | ||
| 376 | * value that this <code>Clob</code> object represents | ||
| 377 | * @param offset the offset into <code>str</code> to start reading | ||
| 378 | * the characters to be written | ||
| 379 | * @param length the number of characters to be written | ||
| 380 | * @return the number of characters written | ||
| 381 | * @throws SerialException if there is an error accessing the | ||
| 382 | * <code>CLOB</code> value; if an invalid position is set; if an | ||
| 383 | * invalid offset value is set; if number of bytes to be written | ||
| 384 | * is greater than the <code>SerialClob</code> length; or the combined | ||
| 385 | * values of the length and offset is greater than the Clob buffer | ||
| 386 | */ | ||
| 387 | public int setString(long pos, String str, int offset, int length) | ||
| 388 | throws SerialException { | ||
| 389 | String temp = str.substring(offset); | ||
| 390 | char cPattern[] = temp.toCharArray(); | ||
| 391 | |||
| 392 | if (offset < 0 || offset > str.length()) { | ||
| 393 | throw new SerialException("Invalid offset in byte array set"); | ||
| 394 | } | ||
| 395 | |||
| 396 | if (pos < 1 || pos > this.length()) { | ||
| 397 | throw new SerialException("Invalid position in BLOB object set"); | ||
| 398 | } | ||
| 399 | |||
| 400 | if ((long)(length) > origLen) { | ||
| 401 | throw new SerialException("Buffer is not sufficient to hold the value"); | ||
| 402 | } | ||
| 403 | |||
| 404 | if ((length + offset) > str.length()) { | ||
| 405 | // need check to ensure length + offset !> bytes.length | ||
| 406 | throw new SerialException("Invalid OffSet. Cannot have combined offset " + | ||
| 407 | " and length that is greater that the Blob buffer"); | ||
| 408 | } | ||
| 409 | |||
| 410 | int i = 0; | ||
| 411 | pos--; //values in the array are at position one less | ||
| 412 | while ( i < length || (offset + i +1) < (str.length() - offset ) ) { | ||
| 413 | this.buf[(int)pos + i ] = cPattern[offset + i ]; | ||
| 414 | i++; | ||
| 415 | } | ||
| 416 | return i; | ||
| 417 | } | ||
| 418 | |||
| 419 | /** | ||
| 420 | * Retrieves a stream to be used to write Ascii characters to the | ||
| 421 | * <code>CLOB</code> value that this <code>SerialClob</code> object represents, | ||
| 422 | * starting at position <code>pos</code>. This method forwards the | ||
| 423 | * <code>setAsciiStream()</code> call to the underlying <code>Clob</code> object in | ||
| 424 | * the event that this <code>SerialClob</code> object is instantiated with a | ||
| 425 | * <code>Clob</code> object. If this <code>SerialClob</code> object is instantiated | ||
| 426 | * with a <code>char</code> array, a <code>SerialException</code> object is thrown. | ||
| 427 | * | ||
| 428 | * @param pos the position at which to start writing to the | ||
| 429 | * <code>CLOB</code> object | ||
| 430 | * @return the stream to which ASCII encoded characters can be written | ||
| 431 | * @throws SerialException if SerialClob is not instantiated with a | ||
| 432 | * Clob object that supports <code>setAsciiStream</code> | ||
| 433 | * @throws SQLException if there is an error accessing the | ||
| 434 | * <code>CLOB</code> value | ||
| 435 | * @see #getAsciiStream | ||
| 436 | */ | ||
| 437 | public java.io.OutputStream setAsciiStream(long pos) | ||
| 438 | throws SerialException, SQLException { | ||
| 439 | if (this.clob.setAsciiStream(pos) != null) { | ||
| 440 | return this.clob.setAsciiStream(pos); | ||
| 441 | } else { | ||
| 442 | throw new SerialException("Unsupported operation. SerialClob cannot " + | ||
| 443 | "return a writable ascii stream\n unless instantiated with a Clob object " + | ||
| 444 | "that has a setAsciiStream() implementation"); | ||
| 445 | } | ||
| 446 | } | ||
| 447 | |||
| 448 | /** | ||
| 449 | * Retrieves a stream to be used to write a stream of Unicode characters | ||
| 450 | * to the <code>CLOB</code> value that this <code>SerialClob</code> object | ||
| 451 | * represents, at position <code>pos</code>. This method forwards the | ||
| 452 | * <code>setCharacterStream()</code> call to the underlying <code>Clob</code> | ||
| 453 | * object in the event that this <code>SerialClob</code> object is instantiated with a | ||
| 454 | * <code>Clob</code> object. If this <code>SerialClob</code> object is instantiated with | ||
| 455 | * a <code>char</code> array, a <code>SerialException</code> is thrown. | ||
| 456 | * | ||
| 457 | * @param pos the position at which to start writing to the | ||
| 458 | * <code>CLOB</code> value | ||
| 459 | * | ||
| 460 | * @return a stream to which Unicode encoded characters can be written | ||
| 461 | * @throws SerialException if the SerialClob is not instantiated with | ||
| 462 | * a Clob object that supports <code>setCharacterStream</code> | ||
| 463 | * @throws SQLException if there is an error accessing the | ||
| 464 | * <code>CLOB</code> value | ||
| 465 | * @see #getCharacterStream | ||
| 466 | */ | ||
| 467 | public java.io.Writer setCharacterStream(long pos) | ||
| 468 | throws SerialException, SQLException { | ||
| 469 | if (this.clob.setCharacterStream(pos) != null) { | ||
| 470 | return this.clob.setCharacterStream(pos); | ||
| 471 | } else { | ||
| 472 | throw new SerialException("Unsupported operation. SerialClob cannot " + | ||
| 473 | "return a writable character stream\n unless instantiated with a Clob object " + | ||
| 474 | "that has a setCharacterStream implementation"); | ||
| 475 | } | ||
| 476 | } | ||
| 477 | |||
| 478 | /** | ||
| 479 | * Truncates the <code>CLOB</code> value that this <code>SerialClob</code> | ||
| 480 | * object represents so that it has a length of <code>len</code> | ||
| 481 | * characters. | ||
| 482 | * <p> | ||
| 483 | * Truncating a <code>SerialClob</code> object to length 0 has the effect of | ||
| 484 | * clearing its contents. | ||
| 485 | * | ||
| 486 | * @param length the length, in bytes, to which the <code>CLOB</code> | ||
| 487 | * value should be truncated | ||
| 488 | * @throws SQLException if there is an error accessing the | ||
| 489 | * <code>CLOB</code> value | ||
| 490 | */ | ||
| 491 | public void truncate(long length) throws SerialException { | ||
| 492 | if (length > len) { | ||
| 493 | throw new SerialException | ||
| 494 | ("Length more than what can be truncated"); | ||
| 495 | } else { | ||
| 496 | len = length; | ||
| 497 | // re-size the buffer | ||
| 498 | |||
| 499 | if (len == 0) { | ||
| 500 | buf = new char[] {}; | ||
| 501 | } else { | ||
| 502 | buf = (this.getSubString(1, (int)len)).toCharArray(); | ||
| 503 | } | ||
| 504 | |||
| 505 | } | ||
| 506 | } | ||
| 507 | |||
| 508 | |||
| 509 | public Reader getCharacterStream(long pos, long length) throws SQLException { | ||
| 510 | throw new java.lang.UnsupportedOperationException("Not supported"); | ||
| 511 | } | ||
| 512 | |||
| 513 | public void free() throws SQLException { | ||
| 514 | throw new java.lang.UnsupportedOperationException("Not supported"); | ||
| 515 | } | ||
| 516 | |||
| 517 | /** | ||
| 518 | * The identifier that assists in the serialization of this <code>SerialClob</code> | ||
| 519 | * object. | ||
| 520 | */ | ||
| 521 | static final long serialVersionUID = -1662519690087375313L; | ||
| 522 | } | ||