com.google.iosched.model.validator.RegexpConverter.java Source code

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Here is the source code for com.google.iosched.model.validator.RegexpConverter.java

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/*
 * 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.iosched.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);
        }
    }
}