alpine.util.JavaVersion.java Source code

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Here is the source code for alpine.util.JavaVersion.java

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/*
 * This file is part of Alpine.
 *
 * 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.
 *
 * Copyright (c) Steve Springett. All Rights Reserved.
 */
package alpine.util;

import org.apache.commons.lang3.math.NumberUtils;

/**
 * This class provides a consistent mechanism to identify Java versions regardless of
 * the version of Java being identified. This class supports legacy Java versions from
 * Java 1.0 to 1.8 as well as Java 9 and higher when the numbering format was changed.
 *
 * @author Steve Springett
 * @since 1.3.0
 */
public class JavaVersion {

    private int major, minor, update;

    public JavaVersion() {
        this(System.getProperty("java.runtime.version"));
    }

    public JavaVersion(String versionString) {
        if (versionString.startsWith("1.")) {
            final String[] javaVersionElements = versionString.split("\\.|_|-|-b");
            major = NumberUtils.toInt(javaVersionElements[1]);
            minor = NumberUtils.toInt(javaVersionElements[2]);
            update = NumberUtils.toInt(javaVersionElements[3]);
        } else {
            final String[] javaVersionElements = versionString.split("\\.|\\+");
            major = NumberUtils.toInt(javaVersionElements[0]);
            minor = NumberUtils.toInt(javaVersionElements[1]);
            update = NumberUtils.toInt(javaVersionElements[2]);
        }
    }

    public int getMajor() {
        return major;
    }

    public int getMinor() {
        return minor;
    }

    public int getUpdate() {
        return update;
    }

    /**
     * Returns a semantic version string of the version with the following format:
     * major.minor.update+build.
     */
    @Override
    public String toString() {
        return major + "." + minor + "." + update;
    }

}