/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cocoon.woody.datatype.validationruleimpl;
import org.apache.cocoon.woody.datatype.ValidationRule;
import org.apache.cocoon.woody.util.DomHelper;
import org.w3c.dom.Element;
import org.outerj.expression.Expression;
/**
* Builds {@link AssertValidationRule}s.
*
* @version $Id: AssertValidationRuleBuilder.java 30932 2004-07-29 17:35:38Z vgritsenko $
*/
public class AssertValidationRuleBuilder extends AbstractValidationRuleBuilder {
public ValidationRule build(Element validationRuleElement) throws Exception {
String exprStr = validationRuleElement.getAttribute("test");
if (exprStr.length() == 0)
throw new Exception("assert validation rule requires a \"test\" attribute at " + DomHelper.getLocation(validationRuleElement));
Expression testExpression = parseExpression(exprStr, validationRuleElement, "test");
if (testExpression.getResultType() != null && !Boolean.class.isAssignableFrom(testExpression.getResultType()))
throw new Exception("Expression should evaluate to a boolean on assert validation rule at " + DomHelper.getLocation(validationRuleElement));
AssertValidationRule rule = new AssertValidationRule(testExpression);
buildFailMessage(validationRuleElement, rule);
return rule;
}
}