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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.
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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.kernel.internal;

import static java.lang.System.getProperty;
import static java.util.Objects.requireNonNull;
import static java.util.Objects.requireNonNullElse;

import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Version {
    static final String CUSTOM_VERSION_SETTING = "internal.neo4j.custom.version";
    private static final String DEFAULT_DEV_VERSION = "dev";
    private static final String KERNEL_ARTIFACT_ID = "neo4j-kernel";
    private static final Version KERNEL_VERSION = new Version(KERNEL_ARTIFACT_ID, selectVersion());

    static String selectVersion() {
        var versionString =
                getProperty(CUSTOM_VERSION_SETTING, Version.class.getPackage().getImplementationVersion());
        return Objects.toString(versionString, DEFAULT_DEV_VERSION);
    }

    private final String artifactId;
    private final String title;
    private final String version;
    private final String releaseVersion;

    public static Version getKernel() {
        return KERNEL_VERSION;
    }

    public static String getKernelVersion() {
        return getKernel().getVersion();
    }

    public static String getNeo4jVersion() {
        return getKernel().getReleaseVersion();
    }

    @Override
    public String toString() {
        StringBuilder result = new StringBuilder();
        if (title != null) {
            result.append(title);
            if (artifactId == null || !artifactId.equals(title)) {
                result.append(" (").append(artifactId).append(')');
            }
        } else {
            result.append(requireNonNullElse(artifactId, "Unknown Component"));
        }
        result.append(", ");
        if (title == null) {
            result.append("unpackaged ");
        }
        result.append("version: ").append(getVersion());
        return result.toString();
    }

    /**
     * @return a detailed version string, including source control revision information if that is available, suitable
     * for internal use, logging and debugging.
     */
    public final String getVersion() {
        return version;
    }

    /**
     * @return a user-friendly version string, like "1.0.0-M01" or "2.0.0", suitable for end-user display
     */
    public String getReleaseVersion() {
        return releaseVersion;
    }

    protected Version(String artifactId, String version) {
        requireNonNull(artifactId);
        requireNonNull(version);
        this.artifactId = artifactId;
        this.title = artifactId;
        this.version = version;
        this.releaseVersion = parseReleaseVersion(this.version);
    }

    /**
     * This reads out the user friendly part of the version, for public display.
     */
    private static String parseReleaseVersion(String fullVersion) {
        // Generally, a version we extract from the jar manifest will look like:
        //   1.2.3-M01,abcdef-dirty
        // Parse out the first part of it:
        Pattern pattern = Pattern.compile(
                "(\\d+" + // Major version
                        "\\.\\d+"
                        + // Minor version
                        "(\\.\\d+)?"
                        + // Optional patch version
                        "(-?[^,]+)?)"
                        + // Optional marker, like M01, GA, SNAPSHOT - anything other than a comma
                        ".*" // Anything else, such as git revision
                );

        Matcher matcher = pattern.matcher(fullVersion);
        if (matcher.matches()) {
            return matcher.group(1);
        }

        // If we don't recognize the version pattern, do the safe thing and keep it in full
        return fullVersion;
    }
}