io.pengyuc.jackson.versioning.Version.java Source code

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Here is the source code for io.pengyuc.jackson.versioning.Version.java

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/*******************************************************************************
 * The MIT License (MIT)
 *
 * Copyright (c) 2017 Pengyu Chen
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 ******************************************************************************/

package io.pengyuc.jackson.versioning;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonValue;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;

import java.util.List;

/**
 * Version class that can be compared. Can take multiple version numbers as sub-versions.
 * Each subversion is separated by "." and shall be positive integers.
 * ex: "10.1.2.3"
 */
public class Version implements Comparable<Version> {
    public static final String JsonVersionConfigDeserializing = "io.pengyuc.jackson.versioning.json_version_deserializing";
    public static final String JsonVersionConfigSerializing = "io.pengyuc.jackson.versioning.json_version_serializing";

    private List<Integer> versionNumbers;

    @JsonCreator
    public static Version fromString(String versionStr) {
        Preconditions.checkArgument(!Strings.isNullOrEmpty(versionStr));
        Preconditions.checkArgument(!versionStr.startsWith("."), "Version string must not start with dot: {}",
                versionStr);

        List<String> subVersionStrs = Splitter.on(".").omitEmptyStrings().trimResults().splitToList(versionStr);
        List<Integer> subVersionNumbers = Lists.newArrayListWithExpectedSize(subVersionStrs.size());
        for (String subVersionStr : subVersionStrs) {
            Integer integer = Integer.valueOf(subVersionStr);
            if (integer < 0)
                throw new IllegalArgumentException("Input string value cannot be negative: " + subVersionStr);
            subVersionNumbers.add(integer);
        }
        if (subVersionNumbers.size() == 0) {
            throw new IllegalArgumentException("Cannot convert the version correctly: " + versionStr);
        }
        return new Version(subVersionNumbers);
    }

    private Version(List<Integer> versionNumbers) {
        this.versionNumbers = versionNumbers;
    }

    public int compareTo(Version other) {
        int minLength = Math.min(versionNumbers.size(), other.versionNumbers.size());

        int i = 0;
        for (; i < minLength; i++) {
            int compare = versionNumbers.get(i).compareTo(other.versionNumbers.get(i));
            if (compare != 0)
                return compare;
        }
        final Integer ZERO = 0;
        if (versionNumbers.size() > minLength) {
            for (; i < versionNumbers.size(); i++) {
                int compare = versionNumbers.get(i).compareTo(ZERO);
                if (compare != 0)
                    return compare;
            }
        } else if (other.versionNumbers.size() > minLength) {
            for (; i < other.versionNumbers.size(); i++) {
                int compare = ZERO.compareTo(other.versionNumbers.get(i));
                if (compare != 0)
                    return compare;
            }
        }
        return 0;
    }

    @JsonValue
    public String toString() {
        return Joiner.on(".").join(versionNumbers);
    }
}