/**
* Return a character from the specified index.
*
* @param index the position from which to return a character
* @return a character
* @throws IndexOutOfBoundsException if the index argument is negative or not less than length()
*/
public char charAt(int index) {
init();
if (index < 0) {
throw new IndexOutOfBoundsException("index is less than zero");
}
if (index >= length) {
throw new IndexOutOfBoundsException("index is not less than length");
}
int page = index / CLOB_PAGE_SIZE;
String pageText = (String) results.get(page);
return pageText.charAt(index - page * CLOB_PAGE_SIZE);
}
/**
* Sends the entire contents of the Clob into the given PrintStream. This method should be used in
* preference to toString() in order to save memory with large Clobs.
*
* @param out a PrintStream to write the Clob value to
*/
public void drainToPrintStream(PrintStream out) {
init();
int lowestPage = offset / CLOB_PAGE_SIZE;
int highestPage = (offset + length - 1) / CLOB_PAGE_SIZE;
for (int page = lowestPage; page <= highestPage; page++) {
String pageText = (String) results.get(page);
if (page == highestPage) {
pageText = pageText.substring(0, offset + length - page * CLOB_PAGE_SIZE);
}
if (page == lowestPage) {
pageText = pageText.substring(offset - page * CLOB_PAGE_SIZE, pageText.length());
}
out.print(pageText);
}
}
/**
* Returns a new CharSequence that is a subsequence of this sequence, from start (inclusive) to
* end (exclusive).
*
* @param start the start index, inclusive
* @param end the end index, exclusive
* @return the specified sequence
* @throws IndexOutOfBoundsException if the start or end are negative, if end is greater than
* length(), or if start is greater than end
*/
public ClobAccess subSequence(int start, int end) {
init();
if (start < 0) {
throw new IndexOutOfBoundsException("start is less than zero");
}
if (end > length) {
throw new IndexOutOfBoundsException("end is greater than the length of this Clob");
}
if (end < start) {
throw new IndexOutOfBoundsException("end is less than start");
}
if ((start == 0) && (end == length)) {
return this;
}
return new ClobAccess(results, clob, start + offset, end - start);
}
/**
* Converts the Clob into a String. Be careful that it can fit in memory!
*
* @return a String
*/
@Override
public String toString() {
init();
StringBuilder retval = new StringBuilder();
if (length > 0) {
int lowestPage = offset / CLOB_PAGE_SIZE;
int highestPage = (offset + length - 1) / CLOB_PAGE_SIZE;
for (int page = lowestPage; page <= highestPage; page++) {
String pageText = (String) results.get(page);
if (page == highestPage) {
pageText = pageText.substring(0, offset + length - page * CLOB_PAGE_SIZE);
}
if (page == lowestPage) {
pageText = pageText.substring(offset - page * CLOB_PAGE_SIZE, pageText.length());
}
retval.append(pageText);
}
}
return retval.toString();
}
/**
* Returns the length of this character sequence.
*
* @return the number of chars in this sequence
*/
public int length() {
init();
return length;
}
