01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.forms.validation.impl;
18:
19: import org.apache.cocoon.forms.datatype.ValidationRule;
20: import org.apache.cocoon.forms.formmodel.ExpressionContextImpl;
21: import org.apache.cocoon.forms.formmodel.Widget;
22: import org.apache.cocoon.forms.validation.ValidationError;
23: import org.apache.cocoon.forms.validation.ValidationErrorAware;
24: import org.apache.cocoon.forms.validation.WidgetValidator;
25:
26: /**
27: * An adapter to transform a {@link org.apache.cocoon.forms.datatype.ValidationRule} into a
28: * {@link org.apache.cocoon.forms.validation.WidgetValidator}.
29: *
30: * @version $Id: ValidationRuleValidator.java 449149 2006-09-23 03:58:05Z crossley $
31: */
32: public class ValidationRuleValidator implements WidgetValidator {
33:
34: private ValidationRule rule;
35:
36: public ValidationRuleValidator(ValidationRule rule) {
37: this .rule = rule;
38: }
39:
40: public boolean validate(Widget widget) {
41: if (!(widget instanceof ValidationErrorAware)) {
42: // Invalid widget type
43: throw new IllegalArgumentException("Widget '"
44: + widget.getRequestParameterName()
45: + "' is not ValidationErrorAware");
46: }
47:
48: Object value = widget.getValue();
49: if (value == null) {
50: // No value. Consider it as correct (required="true" will set an error if present)
51: return true;
52:
53: } else {
54: // Non-null value: perform validation
55: ValidationError error = this .rule.validate(value,
56: new ExpressionContextImpl(widget));
57: if (error != null) {
58: // Validation failed
59: ((ValidationErrorAware) widget)
60: .setValidationError(error);
61: return false;
62: } else {
63: // Validation succeeded
64: return true;
65: }
66: }
67: }
68: }
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