io.servicecomb.serviceregistry.version.Version.java Source code

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Here is the source code for io.servicecomb.serviceregistry.version.Version.java

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/*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * 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 io.servicecomb.serviceregistry.version;

import java.util.Objects;

import org.apache.commons.lang.ArrayUtils;

// short version is enough
public class Version implements Comparable<Version> {
    private final String[] ZERO = new String[] { "0", "0", "0" };

    private final short major;

    private final short minor;

    private final short patch;

    private final String version;

    private final long numberVersion;

    // 1
    // 1.0
    // 1.0.0
    public Version(String version) {
        Objects.requireNonNull(version);

        String[] versions = version.split("\\.", -1);
        if (versions.length > 3) {
            throw new IllegalStateException(String.format("Invalid version \"%s\".", version));
        }

        if (versions.length < 3) {
            versions = (String[]) ArrayUtils.addAll(versions, ZERO);
        }
        this.major = parseNumber("major", version, versions[0]);
        this.minor = parseNumber("minor", version, versions[1]);
        this.patch = parseNumber("patch", version, versions[2]);

        this.version = combineStringVersion();
        this.numberVersion = combineVersion();
    }

    private short parseNumber(String name, String allVersion, String version) {
        short value = 0;
        try {
            value = Short.parseShort(version);
        } catch (NumberFormatException e) {
            throw new IllegalStateException(
                    String.format("Invalid %s \"%s\", version \"%s\".", name, version, allVersion), e);
        }

        if (value < 0) {
            throw new IllegalStateException(
                    String.format("%s \"%s\" can not be negative, version \"%s\".", name, version, allVersion));
        }

        return value;
    }

    public Version(short major, short minor, short patch) {
        this.major = major;
        this.minor = minor;
        this.patch = patch;
        this.version = combineStringVersion();
        this.numberVersion = combineVersion();
    }

    private String combineStringVersion() {
        return major + "." + minor + "." + patch;
    }

    private long combineVersion() {
        return (long) major << 32 | (long) minor << 16 | (long) patch;
    }

    public short getMajor() {
        return major;
    }

    public short getMinor() {
        return minor;
    }

    public short getPatch() {
        return patch;
    }

    public String getVersion() {
        return version;
    }

    @Override
    public String toString() {
        return version;
    }

    @Override
    public int hashCode() {
        return version.hashCode();
    }

    @Override
    public boolean equals(Object other) {
        if (other == this) {
            return true;
        }

        if (!(other instanceof Version)) {
            return false;
        }

        return numberVersion == ((Version) other).numberVersion;
    }

    @Override
    public int compareTo(Version other) {
        return Long.compare(numberVersion, other.numberVersion);
    }
}