/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.wicket.validation.validator;
import java.util.regex.Pattern;
import org.apache.wicket.markup.html.form.FormComponent;
import org.apache.wicket.util.parse.metapattern.MetaPattern;
import org.apache.wicket.validation.IValidatable;
import org.apache.wicket.validation.IValidationError;
import org.apache.wicket.validation.IValidator;
import org.apache.wicket.validation.ValidationError;
/**
* Validates an {@link IValidatable} by matching the value against a regular expression pattern. A
* <code>PatternValidator</code> can be constructed with either a Java regular expression (compiled
* or not) or a {@link MetaPattern}. If the pattern matches against the value then it is considered
* valid. If the pattern does not match, the an {@link IValidationError} will be reported on the
* {@link IValidatable}.
* <p>
* For example, to restrict a field to only digits, you might add a <code>PatternValidator</code>
* constructed with the pattern "\d+". Another way to do the same thing would be to construct the
* <code>PatternValidator</code> passing in {@link MetaPattern#DIGITS}. The advantages of using
* {@link MetaPattern} over straight Java regular expressions are that the patterns are easier to
* construct and easier to combine into complex patterns. They are also more readable and more
* reusable. See {@link MetaPattern} for details.
* <p>
* The error message will be generated with the key "PatternValidator" and one additional message
* key ${pattern} for the pattern which failed to match. See {@link FormComponent} for a list of
* further messages keys.
*
* @see java.util.regex.Pattern
*
* @author Jonathan Locke
* @author Igor Vaynberg (ivaynberg)
* @since 1.2.6
*/
public class PatternValidator implements IValidator<String>
{
private static final long serialVersionUID = 1L;
/** the pattern to match */
private final Pattern pattern;
/** whether to exclude matching input **/
private boolean reverse = false;
/**
* Constructor that accepts a <code>String</code> regular expression pattern.
*
* @param pattern
* a regular expression pattern
*/
public PatternValidator(final String pattern)
{
this(Pattern.compile(pattern));
}
/**
* Constructor that accepts a <code>String</code> pattern and Java <code>regex</code> compile
* flags as arguments.
*
* @param pattern
* a regular expression pattern
* @param flags
* compile flags for <code>java.util.regex.Pattern</code>
*/
public PatternValidator(final String pattern, final int flags)
{
this(Pattern.compile(pattern, flags));
}
/**
* Constructor that accepts a compiled pattern.
*
* @param pattern
* a compiled pattern
*/
public PatternValidator(final Pattern pattern)
{
this.pattern = pattern;
}
/**
* Constructor that accepts a <code>MetaPattern</code> argument.
*
* @param pattern
* a <code>MetaPattern</code>
*/
public PatternValidator(final MetaPattern pattern)
{
this(pattern.pattern());
}
/**
* Gets the regexp pattern.
*
* @return the regexp pattern
*/
public final Pattern getPattern()
{
return pattern;
}
/**
* If set to true then input that matches the pattern is considered invalid.
*
* @param reverse
* @return itself
*/
public PatternValidator setReverse(boolean reverse)
{
this.reverse = reverse;
return this;
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString()
{
return "[PatternValidator pattern = " + pattern + "]";
}
/**
* Checks a value against this <code>PatternValidator</code>'s {@link Pattern}.
*
* @param validatable
* the <code>IValidatable</code> to check
*/
@Override
public void validate(IValidatable<String> validatable)
{
// Check value against pattern
if (pattern.matcher(validatable.getValue()).matches() == reverse)
{
ValidationError error = new ValidationError(this);
error.setVariable("pattern", pattern.pattern());
validatable.error(decorate(error, validatable));
}
}
/**
* Allows subclasses to decorate reported errors
*
* @param error
* @param validatable
* @return decorated error
*/
protected IValidationError decorate(IValidationError error, IValidatable<String> validatable)
{
return error;
}
}