123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116 |
- /*
- * Copyright 2000-2018 Vaadin Ltd.
- *
- * 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.vaadin.data.validator;
-
- import java.util.regex.Matcher;
- import java.util.regex.Pattern;
-
- import com.vaadin.data.ValidationResult;
- import com.vaadin.data.ValueContext;
-
- /**
- * A string validator comparing the string against a Java regular expression.
- * Both complete matches and substring matches are supported.
- * <p>
- * For the Java regular expression syntax, see {@link java.util.regex.Pattern}.
- *
- * @author Vaadin Ltd.
- * @since 8.0
- */
- @SuppressWarnings("serial")
- public class RegexpValidator extends AbstractValidator<String> {
-
- private Pattern pattern;
- private boolean complete;
- private transient Matcher matcher = null;
-
- /**
- * Creates a validator for checking that the regular expression matches the
- * complete string to validate.
- *
- * @param errorMessage
- * the message to display in case the value does not validate.
- * @param regexp
- * a Java regular expression
- */
- public RegexpValidator(String errorMessage, String regexp) {
- this(errorMessage, regexp, true);
- }
-
- /**
- * Creates a validator for checking that the regular expression matches the
- * string to validate.
- *
- * @param errorMessage
- * the message to display in case the value does not validate.
- * @param regexp
- * a Java regular expression
- * @param complete
- * true to use check for a complete match, false to look for a
- * matching substring
- *
- */
- public RegexpValidator(String errorMessage, String regexp,
- boolean complete) {
- super(errorMessage);
- pattern = Pattern.compile(regexp);
- this.complete = complete;
- }
-
- @Override
- public ValidationResult apply(String value, ValueContext context) {
- return toResult(value, isValid(value));
- }
-
- @Override
- public String toString() {
- return "RegexpValidator[" + pattern + "]";
- }
-
- /**
- * Returns whether the given string matches the regular expression.
- *
- * @param value
- * the string to match
- * @return true if the string matched, false otherwise
- */
- protected boolean isValid(String value) {
- if (value == null) {
- return true;
- }
- if (complete) {
- return getMatcher(value).matches();
- } else {
- return getMatcher(value).find();
- }
- }
-
- /**
- * Returns a new or reused matcher for the pattern.
- *
- * @param value
- * the string to find matches in
- * @return a matcher for the string
- */
- private Matcher getMatcher(String value) {
- if (matcher == null) {
- matcher = pattern.matcher(value);
- } else {
- matcher.reset(value);
- }
- return matcher;
- }
- }
|