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A set of basic utilities used in Jitsi projects

There is a newer version: 1.0-133-g6af1020

/*
 * Copyright @ 2015 - present, 8x8 Inc
 *
 * 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 org.jitsi.utils.version;

import java.util.regex.*;

/**
 * Base implementation of VersionService that uses major, minor
 * and nightly build id fields for versioning purposes.
 *
 * @author Emil Ivov
 * @author Pawel Domas
 */
public abstract class AbstractVersionService
    implements VersionService
{
    /**
     * The pattern that will parse strings to version object.
     */
    private static final Pattern PARSE_VERSION_STRING_PATTERN =
        Pattern.compile("(\\d+)\\.(\\d+)\\.([\\d\\.]+)");

    /**
     * Returns a Version instance corresponding to the version
     * string.
     *
     * @param version a version String that we have obtained by calling a
     *   Version.toString() method.
     * @return the Version object corresponding to the
     *   version string. Or null if we cannot parse the string.
     */
    public Version parseVersionString(String version)
    {
        Matcher matcher = PARSE_VERSION_STRING_PATTERN.matcher(version);

        if (matcher.matches() && matcher.groupCount() == 3)
        {
            return createVersionImpl(
                Integer.parseInt(matcher.group(1)),
                Integer.parseInt(matcher.group(2)),
                matcher.group(3));
        }

        return null;
    }

    /**
     * Creates new Version instance specific to current implementation.
     * @param majorVersion major version number.
     * @param minorVersion minor version number.
     * @param nightlyBuildId nightly build id string.
     * @return new Version instance specific to current implementation
     *         for given major, minor and nightly build id parameters.
     */
    protected abstract Version createVersionImpl(int majorVersion,
                                                 int minorVersion,
                                                 String nightlyBuildId);
}