/*
* Copyright (c) 2002-2006 by OpenSymphony
* All rights reserved.
*/
package com.opensymphony.xwork2.validator.validators;
import com.opensymphony.xwork2.validator.ValidationException;
/**
* <!-- START SNIPPET: javadoc -->
* Validates a field using an OGNL expression.
* <!-- END SNIPPET: javadoc -->
* <p/>
*
* <!-- START SNIPPET: parameters -->
* <ul>
* <li>fieldName - The field name this validator is validating. Required if using Plain-Validator Syntax otherwise not required</li>
* <li>expression - The Ognl expression (must evaluate to a boolean) which is to be evalidated the stack</li>
* </ul>
* <!-- END SNIPPET: parameters -->
*
* <pre>
* <!-- START SNIPPET: example -->
* <!-- Plain Validator Syntax -->
* <validators>
* <!-- Plain Validator Syntax -->
* <validator type="fieldexpression">
* <param name="fieldName">myField</param>
* <param name="expression"><![CDATA[#myCreditLimit > #myGirfriendCreditLimit]]></param>
* <message>My credit limit should be MORE than my girlfriend</message>
* <validator>
*
* <!-- Field Validator Syntax -->
* <field name="myField">
* <field-validator type="fieldexpression">
* <param name="expression"><![CDATA[#myCreditLimit > #myGirfriendCreditLimit]]></param>
* <message>My credit limit should be MORE than my girlfriend</message>
* </field-validator>
* </field>
*
* </vaidators>
* <!-- END SNIPPET: example -->
* </pre>
*
*
* @author $Author: mrdon $
* @version $Revision: 1063 $
*/
public class FieldExpressionValidator extends FieldValidatorSupport {
private String expression;
public void setExpression(String expression) {
this.expression = expression;
}
public String getExpression() {
return expression;
}
public void validate(Object object) throws ValidationException {
String fieldName = getFieldName();
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 " + obj + " when trying to get Boolean.");
}
if (!answer.booleanValue()) {
addFieldError(fieldName, object);
}
}
}
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