01: /*
02:
03: Derby - Class org.apache.derby.iapi.services.io.Storable
04:
05: Licensed to the Apache Software Foundation (ASF) under one or more
06: contributor license agreements. See the NOTICE file distributed with
07: this work for additional information regarding copyright ownership.
08: The ASF licenses this file to you under the Apache License, Version 2.0
09: (the "License"); you may not use this file except in compliance with
10: the License. You may obtain a copy of the License at
11:
12: http://www.apache.org/licenses/LICENSE-2.0
13:
14: Unless required by applicable law or agreed to in writing, software
15: distributed under the License is distributed on an "AS IS" BASIS,
16: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17: See the License for the specific language governing permissions and
18: limitations under the License.
19:
20: */
21:
22: package org.apache.derby.iapi.services.io;
23:
24: import java.lang.ClassNotFoundException;
25:
26: import java.io.IOException;
27:
28: /**
29: Formatable for holding SQL data (which may be null).
30: @see Formatable
31: */
32: public interface Storable extends Formatable {
33:
34: /**
35: Return whether the value is null or not.
36:
37: @return true if the value is null and false otherwise.
38: **/
39: public boolean isNull();
40:
41: /**
42: Restore this object to its (SQL)null value.
43: **/
44: public void restoreToNull();
45: }
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