01: /**
02: * Copyright 2006 Webmedia Group Ltd.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: **/package org.araneaframework.uilib.form.constraint;
16:
17: import org.araneaframework.Environment;
18: import org.araneaframework.uilib.form.Constraint;
19:
20: /**
21: * Optional {@link Constraint} only applies when constrained field has some
22: * real value. This is a wrapper around {@link Constraint}, wrapped
23: * {@link Constraint} will be applied only if the constrained field has
24: * been read from the request.
25: *
26: * @author Jevgeni Kabanov (ekabanov <i>at</i> araneaframework <i>dot</i> org)
27: */
28: public class OptionalConstraint extends BaseFieldConstraint {
29: private Constraint constraint;
30:
31: public OptionalConstraint(Constraint constraint) {
32: this .constraint = constraint;
33: }
34:
35: protected void validateConstraint() throws Exception {
36: if (isRead()) {
37: constraint.validate();
38: addErrors(constraint.getErrors());
39: constraint.clearErrors();
40: }
41: }
42:
43: public void setCustomErrorMessage(String customErrorMessage) {
44: constraint.setCustomErrorMessage(customErrorMessage);
45: }
46:
47: public void setEnvironment(Environment environment) {
48: super.setEnvironment(environment);
49: constraint.setEnvironment(environment);
50: }
51: }
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