/*
* Copyright 2010 Werner Guttmann
*
* 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.exolab.castor.util;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
/**
* An implementation of {@link RegExpEvaluator} that uses the Java Regular
* Expression library.
*
* @author <a href="mailto:george76@hotmail.com">George Varghese</a>
* @since 1.3.2
**/
public class SunRegExpEvaluator implements RegExpEvaluator {
/**
* The Regular expression
**/
private Pattern _pattern;
/**
* Sets the regular expression to match against during a call to #matches
*
* @param rexpr
* the regular expression
**/
public void setExpression(String rexpr) {
if (rexpr != null) {
try {
// -- patch and compile expression
_pattern = Pattern.compile(rexpr);
} catch (PatternSyntaxException ex) {
String err = "RegExp Syntax error: ";
err += ex.getMessage();
err += " ; error occured with the following "
+ "regular expression: " + rexpr;
IllegalArgumentException iae = new IllegalArgumentException(err);
iae.initCause(ex);
throw iae;
}
}
}
/**
* Returns true if the given String is matched by the regular expression of
* this RegExpEvaluator
*
* @param value
* the String to check the production of
* @return true if the given string matches the regular expression of this
* RegExpEvaluator
* @see #setExpression
**/
public boolean matches(String value) {
if (_pattern != null) {
return _pattern.matcher(value).matches();
}
return true;
}
}