/*
* Copyright 2002-2006,2009 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 com.opensymphony.xwork2.validator.validators;
import com.opensymphony.xwork2.validator.ValidationException;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
/**
* <!-- START SNIPPET: javadoc -->
* A Non-Field Level validator that validates based on regular expression supplied.
* <!-- END SNIPPET: javadoc -->
*
* <!-- START SNIPPET: parameters -->
* <ul>
* <li>expression - the Ognl expression to be evaluated against the stack (Must evaluate to a Boolean)</li>
* </ul>
* <!-- END SNIPPET: parameters -->
*
*
* <pre>
* <!-- START SNIPPET: example -->
* <validators>
* <validator type="expression">
* <param name="expression"> .... </param>
* <message>Failed to meet Ognl Expression .... </message>
* </validator>
* </validators>
* <!-- END SNIPPET: example -->
* </pre>
*
* @author Jason Carreira
*/
public class ExpressionValidator extends ValidatorSupport {
private static final Logger LOG = LogManager.getLogger(ExpressionValidator.class);
private String expression;
public void setExpression(String expression) {
this.expression = expression;
}
public String getExpression() {
return expression;
}
public void validate(Object object) throws ValidationException {
Boolean answer = Boolean.FALSE;
Object obj = null;
try {
obj = getFieldValue(expression, object);
} catch (ValidationException e) {
throw e;
} catch (Exception e) {
// let this pass, but it will be logged right below
}
if ((obj != null) && (obj instanceof Boolean)) {
answer = (Boolean) obj;
} else {
LOG.warn("Got result of [{}] when trying to get Boolean.", obj);
}
if (!answer) {
LOG.debug("Validation failed on expression [{}] with validated object [{}]", expression, object);
addActionError(object);
}
}
}