Rewrite ClobUpdatableReader constructors
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Key: DERBY-2818
URL: https://issues.apache.org/jira/browse/DERBY-2818
Project: Derby
Issue Type: Improvement
Components: JDBC
Affects Versions: 10.3.0.0
Reporter: Kristian Waagan
Assignee: Kristian Waagan
Fix For: 10.3.0.0
When the fix for DERBY-2806 is in place, the current implementation of
ClobUpdateableReader will fail.
This patch is a preparation for the mentioned issue, and I have also removed
some "internal" (package private) methods from EmbedClob and replaced it with a
single one.
Instead of writing methods that forwards calls to the underlying InternalClob,
the method getInternalClob will return the internal clob itself. This seems
more in place, since the method getByteLength does not belong in EmbedClob. It
also comes with a warning that using the reference to the internal clob object
requires the caller to take more care. Second, isWritable() does not belong to
EmbedClob either, as a Clob is always writable (unless the database/connection
itself is read/only). However, the internal clob representation may be
read-only, in case EmbedClob must clone the content and create a writable
representation.
The fix leaves more of the handling of implementation details to the
InternalClob itself.
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