/*
* 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.ValidationError;
import org.apache.cocoon.woody.formmodel.CannotYetResolveWarning;
import org.outerj.expression.ExpressionContext;
import org.outerj.expression.ExpressionException;
import org.outerj.expression.Expression;
/**
* Generic validation rule that evaluates an expression. If the outcome of the expression is true,
* the validation is successful, otherwise not.
*
* @version $Id: AssertValidationRule.java 30932 2004-07-29 17:35:38Z vgritsenko $
*/
public class AssertValidationRule extends AbstractValidationRule {
private Expression testExpression;
public AssertValidationRule(Expression testExpression) {
this.testExpression = testExpression;
}
public ValidationError validate(Object value, ExpressionContext expressionContext) {
Object expressionResult;
try {
expressionResult = testExpression.evaluate(expressionContext);
} catch (CannotYetResolveWarning w) {
return null;
} catch (ExpressionException e) {
return new ValidationError("Error evaluating expression on assert validation rule.", false);
}
if (!(expressionResult instanceof Boolean))
return new ValidationError("Got non-boolean result from expression on assert validation rule.", false);
if (((Boolean)expressionResult).booleanValue())
return null;
else
return hasFailMessage() ? getFailMessage() : new ValidationError("Assertion validation rule failed.", false);
}
public boolean supportsType(Class clazz, boolean arrayType) {
return true;
}
}