/*
* Copyright 2014 Google Inc. All rights reserved.
*
* 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.google.samples.apps.iosched.server.schedule.model.validator;
import com.google.gson.JsonPrimitive;
import java.util.regex.Pattern;
public class RegexpConverter extends Converter {
private Pattern pattern;
private boolean acceptsNull;
public RegexpConverter(String pattern) {
this(pattern, true);
}
public RegexpConverter(String pattern, boolean acceptsNull) {
this.acceptsNull = acceptsNull;
this.pattern = Pattern.compile(pattern);
}
@Override
public JsonPrimitive convert(JsonPrimitive value) {
if (value == null) {
if (acceptsNull) {
return null;
} else {
throw new ConverterException(value, this);
}
}
String str = value.getAsString();
if (str.isEmpty() || pattern.matcher(str).matches()) {
return value;
} else {
throw new ConverterException(value, this);
}
}
}