/**
* Create a BLOB value from a stream.
*
* @param in the input stream
* @param length the number of characters to read, or -1 for no limit
* @param handler the data handler
* @return the lob value
*/
private static ValueLob createBlob(InputStream in, long length, DataHandler handler) {
try {
if (handler == null) {
byte[] data = IOUtils.readBytesAndClose(in, (int) length);
return createSmallLob(Value.BLOB, data);
}
long remaining = Long.MAX_VALUE;
boolean compress = handler.getLobCompressionAlgorithm(Value.BLOB) != null;
if (length >= 0 && length < remaining) {
remaining = length;
}
int len = getBufferSize(handler, compress, remaining);
byte[] buff;
if (len >= Integer.MAX_VALUE) {
buff = IOUtils.readBytesAndClose(in, -1);
len = buff.length;
} else {
buff = DataUtils.newBytes(len);
len = IOUtils.readFully(in, buff, len);
}
if (len <= handler.getMaxLengthInplaceLob()) {
byte[] small = DataUtils.newBytes(len);
System.arraycopy(buff, 0, small, 0, len);
return ValueLob.createSmallLob(Value.BLOB, small);
}
ValueLob lob = new ValueLob(Value.BLOB, null);
lob.createFromStream(buff, len, in, remaining, handler);
return lob;
} catch (IOException e) {
throw DbException.convertIOException(e, null);
}
}
/**
* Create a CLOB value from a stream.
*
* @param in the reader
* @param length the number of characters to read, or -1 for no limit
* @param handler the data handler
* @return the lob value
*/
private static ValueLob createClob(Reader in, long length, DataHandler handler) {
try {
if (handler == null) {
String s = IOUtils.readStringAndClose(in, (int) length);
return createSmallLob(Value.CLOB, s.getBytes(Constants.UTF8));
}
boolean compress = handler.getLobCompressionAlgorithm(Value.CLOB) != null;
long remaining = Long.MAX_VALUE;
if (length >= 0 && length < remaining) {
remaining = length;
}
int len = getBufferSize(handler, compress, remaining);
char[] buff;
if (len >= Integer.MAX_VALUE) {
String data = IOUtils.readStringAndClose(in, -1);
buff = data.toCharArray();
len = buff.length;
} else {
buff = new char[len];
len = IOUtils.readFully(in, buff, len);
}
if (len <= handler.getMaxLengthInplaceLob()) {
byte[] small = new String(buff, 0, len).getBytes(Constants.UTF8);
return ValueLob.createSmallLob(Value.CLOB, small);
}
ValueLob lob = new ValueLob(Value.CLOB, null);
lob.createFromReader(buff, len, in, remaining, handler);
return lob;
} catch (IOException e) {
throw DbException.convertIOException(e, null);
}
}
/**
* Create an independent copy of this temporary value. The file will not be deleted automatically.
*
* @return the value
*/
@Override
public ValueLob copyToTemp() {
ValueLob lob;
if (type == CLOB) {
lob = ValueLob.createClob(getReader(), precision, handler);
} else {
lob = ValueLob.createBlob(getInputStream(), precision, handler);
}
return lob;
}
@Override
public Value convertPrecision(long precision, boolean force) {
if (this.precision <= precision) {
return this;
}
ValueLob lob;
if (type == CLOB) {
lob = ValueLob.createClob(getReader(), precision, handler);
} else {
lob = ValueLob.createBlob(getInputStream(), precision, handler);
}
return lob;
}
/**
* Convert a lob to another data type. The data is fully read in memory except when converting to
* BLOB or CLOB.
*
* @param t the new type
* @return the converted value
*/
@Override
public Value convertTo(int t) {
if (t == type) {
return this;
} else if (t == Value.CLOB) {
ValueLob copy = ValueLob.createClob(getReader(), -1, handler);
return copy;
} else if (t == Value.BLOB) {
ValueLob copy = ValueLob.createBlob(getInputStream(), -1, handler);
return copy;
}
return super.convertTo(t);
}
private static ValueLob copy(ValueLob lob) {
ValueLob copy =
new ValueLob(
lob.type,
lob.handler,
lob.fileName,
lob.tableId,
lob.objectId,
lob.linked,
lob.precision,
lob.compressed);
copy.small = lob.small;
copy.hash = lob.hash;
return copy;
}
@Override
public Value link(DataHandler h, int tabId) {
if (fileName == null) {
this.tableId = tabId;
return this;
}
if (linked) {
ValueLob copy = ValueLob.copy(this);
copy.objectId = getNewObjectId(h);
copy.tableId = tabId;
String live = getFileName(h, copy.tableId, copy.objectId);
copyFileTo(h, fileName, live);
copy.fileName = live;
copy.linked = true;
return copy;
}
if (!linked) {
this.tableId = tabId;
String live = getFileName(h, tableId, objectId);
if (tempFile != null) {
tempFile.stopAutoDelete();
tempFile = null;
}
renameFile(h, fileName, live);
fileName = live;
linked = true;
}
return this;
}
