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java.lang.Objectjava.io.InputStream
org.apache.derby.client.am.ClobLocatorInputStream
public class ClobLocatorInputStream
An InputStream
that will use an locator to fetch the
Clob value from the server.
Closing a ByteArrayInputStream
has no effect. The methods in
this class can be called after the stream has been closed without
generating an IOException
.
This InputStream
implementation is pretty basic. No
buffering of data is done. Hence, for efficieny #read(byte[])
should be used instead of #read(). Marks are not supported, but it
should be pretty simple to extend the implementation to support
this. A more efficient skip implementation should also be
straight-forward.
Field Summary | |
---|---|
private Clob |
clob
The Clob to be accessed. |
private Connection |
connection
Connection used to read Clob from server. |
private long |
currentPos
Current position in the underlying Clob. |
Constructor Summary | |
---|---|
ClobLocatorInputStream(Connection connection,
Clob clob)
Create an InputStream for reading the
Clob value represented by the given locator based
Clob object. |
|
ClobLocatorInputStream(Connection connection,
Clob clob,
long pos)
Create an InputStream for reading the
Clob value represented by the given locator based
Clob object. |
Method Summary | |
---|---|
private byte[] |
getBytesFromString(java.lang.String str)
Returns a Byte array from the
String passed as Input. |
int |
read()
|
int |
read(byte[] b,
int off,
int len)
|
private byte[] |
readBytes(int len)
Read the next len bytes of the Clob
value from the server. |
Methods inherited from class java.io.InputStream |
---|
available, close, mark, markSupported, read, reset, skip |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
private final Connection connection
private final Clob clob
private long currentPos
Constructor Detail |
---|
public ClobLocatorInputStream(Connection connection, Clob clob) throws SqlException
InputStream
for reading the
Clob
value represented by the given locator based
Clob
object.
connection
- connection to be used to read the
Clob
value from the serverclob
- Clob
object that contains locator for
the Clob
value on the server.
SqlException
public ClobLocatorInputStream(Connection connection, Clob clob, long pos) throws SqlException
InputStream
for reading the
Clob
value represented by the given locator based
Clob
object.
connection
- connection to be used to read the
Clob
value from the serverclob
- Clob
object that contains locator for
the Clob
value on the server.pos
- the position inside the Clob from which
the reading must begin.
- Throws:
SqlException
Method Detail |
---|
public int read() throws java.io.IOException
read
in class java.io.InputStream
java.io.IOException
This method fetches one byte at a time from the server. For more
efficient retrieval, use #read(byte[]).
public int read(byte[] b, int off, int len) throws java.io.IOException
read
in class java.io.InputStream
java.io.IOException
InputStream.read(byte[], int, int)
private byte[] readBytes(int len) throws java.io.IOException
len
bytes of the Clob
value from the server.
len
- number of bytes to read
byte[]
containing the read bytes
java.io.IOException
- Wrapped SqlException if reading
from server fails.private byte[] getBytesFromString(java.lang.String str)
Byte
array from the
String
passed as Input.
str
- the input String
.
Byte
corresponding
to the String
that was
input.
|
Built on Thu 2012-03-29 21:53:33+0000, from revision ??? | ||||||||
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