spring.turbo.util.time.ZoneIdUtils Maven / Gradle / Ivy

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package spring.turbo.util.time;

import org.springframework.lang.Nullable;

import java.time.DateTimeException;
import java.time.ZoneId;
import java.util.Objects;
import java.util.regex.Pattern;

import static spring.turbo.util.StringUtils.isBlank;

/**
 * {@link ZoneId} 相关工具
 *
 * @author 应卓
 * @see ZoneId#getAvailableZoneIds()
 * @since 1.1.3
 */
public final class ZoneIdUtils {

    // SYSTEM
    public static final ZoneId SYSTEM_DEFAULT = ZoneId.systemDefault();

    // UTC
    public static final String EUROPE_LONDON_VALUE = "Europe/London";
    public static final ZoneId EUROPE_LONDON = ZoneId.of(EUROPE_LONDON_VALUE);

    // 中国
    public static final String ASIA_SHANGHAI_VALUE = "Asia/Shanghai";
    public static final ZoneId ASIA_SHANGHAI = ZoneId.of(ASIA_SHANGHAI_VALUE);

    // 美国
    public static final String AMERICA_CHICAGO_VALUE = "America/Chicago";
    public static final ZoneId AMERICA_CHICAGO = ZoneId.of(AMERICA_CHICAGO_VALUE);

    // 日本
    public static final String ASIA_TOKYO_VALUE = "Asia/Tokyo";
    public static final ZoneId ASIA_TOKYO = ZoneId.of(ASIA_TOKYO_VALUE);

    /**
     * 私有构造方法
     */
    private ZoneIdUtils() {
    }

    public static ZoneId toZoneIdOrSystemDefault(@Nullable String name) {
        var id = toZoneIdOrDefault(name, SYSTEM_DEFAULT);
        return Objects.requireNonNull(id);
    }

    @Nullable
    public static ZoneId toZoneIdOrDefault(@Nullable String name, @Nullable ZoneId defaultIfNullOrError) {

        if (isBlank(name)) {
            return defaultIfNullOrError;
        }

        try {
            return ZoneId.of(name);
        } catch (DateTimeException e) {
            var matcher = Pattern.compile("^([a-zA-Z]+[+-]\\d+)\\.0+$").matcher(name);
            if (matcher.matches()) {
                name = matcher.replaceAll("$1");
                try {
                    return ZoneId.of(name);
                } catch (Throwable ex) {
                    return defaultIfNullOrError;
                }
            } else {
                return defaultIfNullOrError;
            }
        }
    }

}