01: package org.drools.ruleflow.common.datatype.impl.type;
02:
03: /*
04: * Copyright 2005 JBoss Inc
05: *
06: * Licensed under the Apache License, Version 2.0 (the "License");
07: * you may not use this file except in compliance with the License.
08: * You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing, software
13: * distributed under the License is distributed on an "AS IS" BASIS,
14: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15: * See the License for the specific language governing permissions and
16: * limitations under the License.
17: */
18:
19: import org.drools.ruleflow.common.datatype.DataType;
20:
21: /**
22: * Representation of an undefined datatype.
23: *
24: * @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>
25: */
26: public final class UndefinedDataType implements DataType {
27:
28: private static final long serialVersionUID = 400L;
29: private static UndefinedDataType instance;
30:
31: public static UndefinedDataType getInstance() {
32: if (instance == null) {
33: instance = new UndefinedDataType();
34: }
35: return instance;
36: }
37:
38: public boolean verifyDataType(final Object value) {
39: if (value == null) {
40: return true;
41: }
42: return false;
43: }
44: }
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