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.datatype.validationruleimpl;
18:
19: import org.apache.cocoon.forms.datatype.ValidationRule;
20: import org.apache.cocoon.forms.util.DomHelper;
21: import org.w3c.dom.Element;
22: import org.outerj.expression.Expression;
23:
24: /**
25: * Builds {@link AssertValidationRule}s.
26: *
27: * @version $Id: AssertValidationRuleBuilder.java 449149 2006-09-23 03:58:05Z crossley $
28: */
29: public class AssertValidationRuleBuilder extends
30: AbstractValidationRuleBuilder {
31: public ValidationRule build(Element validationRuleElement)
32: throws Exception {
33: String exprStr = validationRuleElement.getAttribute("test");
34: if (exprStr.length() == 0)
35: throw new Exception(
36: "assert validation rule requires a \"test\" attribute at "
37: + DomHelper
38: .getLocation(validationRuleElement));
39: Expression testExpression = parseExpression(exprStr,
40: validationRuleElement, "test");
41: if (testExpression.getResultType() != null
42: && !Boolean.class.isAssignableFrom(testExpression
43: .getResultType()))
44: throw new Exception(
45: "Expression should evaluate to a boolean on assert validation rule at "
46: + DomHelper
47: .getLocation(validationRuleElement));
48: AssertValidationRule rule = new AssertValidationRule(
49: testExpression);
50: buildFailMessage(validationRuleElement, rule);
51: return rule;
52: }
53: }
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