DriverUtils.java

/*
 * DBeaver - Universal Database Manager
 * Copyright (C) 2010-2017 Serge Rider (serge@jkiss.org)
 *
 * 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.jkiss.dbeaver.registry.driver;

import org.jkiss.code.NotNull;
import org.jkiss.code.Nullable;

import java.util.Collection;
import java.util.List;
import java.util.StringTokenizer;

/**
 * DriverUtils
 */
public class DriverUtils
{

    public static boolean isBetaVersion(@NotNull String versionInfo) {
        return versionInfo.contains("beta") || versionInfo.contains("alpha");
    }

    @Nullable
    public static String findLatestVersion(@NotNull Collection<String> allVersions) {
        String latest = null;
        for (String version : allVersions) {
            if (isBetaVersion(version)) {
                continue;
            }
            if (latest == null || compareVersions(version, latest) > 0) {
                latest = version;
            }
        }
        if (latest == null) {
            // Now use beta versions too
            for (String version : allVersions) {
                if (latest == null || compareVersions(version, latest) > 0) {
                    latest = version;
                }
            }
        }
        return latest;
    }

    public static int compareVersions(@NotNull String v1, @NotNull String v2) {
        StringTokenizer st1 = new StringTokenizer(v1, ".-_");
        StringTokenizer st2 = new StringTokenizer(v2, ".-_");
        while (st1.hasMoreTokens() && st2.hasMoreTokens()) {
            String t1 = st1.nextToken();
            String t2 = st2.nextToken();
            try {
                int cmp = Integer.parseInt(t1) - Integer.parseInt(t2);
                if (cmp != 0) {
                    return cmp;
                }
            } catch (NumberFormatException e) {
                // Non-numeric versions - use lexicographical compare
                int cmp = t1.compareTo(t2);
                if (cmp != 0) {
                    return cmp;
                }
            }
        }
        if (st1.hasMoreTokens()) {
            return 1;
        } else if (st2.hasMoreTokens()) {
            return -1;
        } else {
            return 0;
        }
    }
}