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

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Here is the source code for com.google.iosched.model.validator.YoutubeURLConverter.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.text.MessageFormat;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class YoutubeURLConverter extends Converter {
    private boolean acceptsNull;
    private static Pattern[] patterns = { Pattern.compile("youtube\\.com\\/watch\\?v=([^&?/]+)"),
            Pattern.compile("youtube\\.com\\/embed\\/([^&?/]+)"), Pattern.compile("youtube\\.com\\/v\\/([^&?/]+)"),
            Pattern.compile("youtu\\.be\\/([^&?/]+)"), Pattern.compile("^([A-Za-z0-9_-]{11})$") };
    private static final MessageFormat outFormat = new MessageFormat("https://youtu.be/{0}");

    public YoutubeURLConverter(boolean acceptsNull) {
        this.acceptsNull = acceptsNull;
    }

    @Override
    public JsonPrimitive convert(JsonPrimitive value) {
        if (value == null) {
            if (acceptsNull) {
                return null;
            } else {
                throw new ConverterException(value, this);
            }
        }
        String str = value.getAsString();
        if (acceptsNull && str.isEmpty()) {
            return value;
        }
        for (Pattern p : patterns) {
            Matcher m = p.matcher(str);
            if (m.find()) {
                return new JsonPrimitive(outFormat.format(new String[] { m.group(1) }));
            }
        }
        throw new ConverterException(value, this);
    }
}