/*
* 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.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import com.opensymphony.xwork2.validator.ValidationException;
import org.apache.commons.lang3.StringUtils;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* <!-- START SNIPPET: javadoc -->
* Validates a string field using a regular expression.
* <!-- END SNIPPET: javadoc -->
*
*
* <!-- START SNIPPET: parameters -->
* <ul>
* <li>fieldName - The field name this validator is validating. Required if using Plain-Validator Syntax otherwise not required</li>
* <li>regexp - The RegExp expression</li>
* <li>caseSensitive - Boolean (Optional). Sets whether the expression should be matched against in a case-sensitive way. Default is <code>true</code>.</li>
* <li>trim - Boolean (Optional). Sets whether the expression should be trimmed before matching. Default is <code>true</code>.</li>
* <li>regexExpression - String (Optional). Defines regExp expression as an OGNL expression - will be evaluated to String</li>
* <li>caseSensitiveExpression - String (Optional). Defines caseSensitive param as an OGNL expression - will be evaluated to Boolean.</li>
* <li>trimExpression - String (Optional). Defines trim param as an OGNL expression - will be evaluated to Boolean</li>
* </ul>
* You can mix normal params with expression aware params but thus was not tested
* <!-- END SNIPPET: parameters -->
*
* <!-- START SNIPPET: parameters-warning -->
* Do not use ${regexExpression}, ${caseSensitiveExpression} and ${trimExpression} as an expression as this will turn into infinitive loop!
* <!-- END SNIPPET: parameters-warning -->
*
* <pre>
* <!-- START SNIPPET: example -->
* <validators>
* <!-- Plain Validator Syntax -->
* <validator type="regex">
* <param name="fieldName">myStrangePostcode</param>
* <param name="regex"><![CDATA[([aAbBcCdD][123][eEfFgG][456])]]<>/param>
* </validator>
*
* <!-- Field Validator Syntax -->
* <field name="myStrangePostcode">
* <field-validator type="regex">
* <param name="regex"><![CDATA[([aAbBcCdD][123][eEfFgG][456])]]></param>
* </field-validator>
* </field>
*
* <!-- Field Validator Syntax with expressions -->
* <field name="myStrangePostcode">
* <field-validator type="regex">
* <param name="regexExpression">${regexValue}</param> <!-- will be evaluated as: String getRegexValue() -->
* <param name="caseSensitiveExpression">${caseSensitiveValue}</param> <!-- will be evaluated as: boolean getCaseSensitiveValue() -->
* <param name="trimExpression">${trimValue}</param> <!-- will be evaluated as: boolean getTrimValue() -->
* </field-validator>
* </field>
* </validators>
* <!-- END SNIPPET: example -->
* </pre>
*
* @author Quake Wang
* @version $Date$ $Revision$
*/
public class RegexFieldValidator extends FieldValidatorSupport {
private static final Logger LOG = LoggerFactory.getLogger(RegexFieldValidator.class);
private String regex;
private String regexExpression;
private Boolean caseSensitive = true;
private String caseSensitiveExpression = "";
private Boolean trim = true;
private String trimExpression = "";
public void validate(Object object) throws ValidationException {
String fieldName = getFieldName();
Object value = this.getFieldValue(fieldName, object);
// if there is no value - don't do comparison
// if a value is required, a required validator should be added to the field
String regexToUse = getRegex();
if (LOG.isDebugEnabled()) {
LOG.debug("Defined regexp as [#0]", regexToUse);
}
if (value == null || regexToUse == null) {
return;
}
// XW-375 - must be a string
if (!(value instanceof String)) {
return;
}
// string must not be empty
String str = ((String) value).trim();
if (str.length() == 0) {
return;
}
// match against expression
Pattern pattern;
if (isCaseSensitive()) {
pattern = Pattern.compile(regexToUse);
} else {
pattern = Pattern.compile(regexToUse, Pattern.CASE_INSENSITIVE);
}
String compare = (String) value;
if ( isTrimed() ) {
compare = compare.trim();
}
Matcher matcher = pattern.matcher( compare );
if (!matcher.matches()) {
addFieldError(fieldName, object);
}
}
/**
* @return Returns the regular expression to be matched.
*/
public String getRegex() {
if (StringUtils.isNotEmpty(regex)) {
return regex;
} else if (StringUtils.isNotEmpty(regexExpression)) {
return (String) parse(regexExpression, String.class);
} else {
return null;
}
}
/**
* Sets the regular expression to be matched
*/
public void setRegex(String regex) {
this.regex = regex;
}
/**
* Sets the regular expression as an OGNL expression to be matched
*/
public void setRegexExpression(String regexExpression) {
this.regexExpression = regexExpression;
}
/**
* @return Returns whether the expression should be matched against in
* a case-sensitive way. Default is <code>true</code>.
*/
public boolean isCaseSensitive() {
if (StringUtils.isNotEmpty(caseSensitiveExpression)) {
return (Boolean) parse(caseSensitiveExpression, Boolean.class);
}
return caseSensitive;
}
/**
* Sets whether the expression should be matched against in
* a case-sensitive way. Default is <code>true</code>.
*/
public void setCaseSensitive(Boolean caseSensitive) {
this.caseSensitive = caseSensitive;
}
/**
* Allows specify caseSensitive param as an OGNL expression
*/
public void setCaseSensitiveExpression(String caseSensitiveExpression) {
this.caseSensitiveExpression = caseSensitiveExpression;
}
/**
* @return Returns whether the expression should be trimed before matching.
* Default is <code>true</code>.
*/
public boolean isTrimed() {
if (StringUtils.isNotEmpty(trimExpression)) {
return (Boolean) parse(trimExpression, Boolean.class);
}
return trim;
}
/**
* Sets whether the expression should be trimed before matching.
* Default is <code>true</code>.
*/
public void setTrim(Boolean trim) {
this.trim = trim;
}
/**
* Allows specify trim param as an OGNL expression
*/
public void setTrimExpression(String trimExpression) {
this.trimExpression = trimExpression;
}
}