net.aequologica.neo.shakuntala.UUIDProducerImpl Maven / Gradle / Ivy

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package net.aequologica.neo.shakuntala;

import java.util.Map;
import java.util.UUID;

import javax.inject.Named;
import javax.inject.Singleton;

@Singleton
@Named(value = "uuid")
public class UUIDProducerImpl implements UUIDProducer {

    final private UUID uuid;
    
    public UUIDProducerImpl() {
        UUID localuuid = UUID.randomUUID();
        
        try {
            Map env = System.getenv();
            String uuidEnv = env.get("shakuntala.uuid");
            if (uuidEnv != null) {
                localuuid = UUID.fromString(uuidEnv);
            } else {
                String uuidproperty = System.getProperty("shakuntala.uuid");
                if (uuidproperty != null) {
                    localuuid = UUID.fromString(uuidproperty);
                }
            }
        } catch (IllegalArgumentException e) {
            localuuid = UUID.randomUUID();
        } finally {
            uuid = localuuid;
        }
    }

    @Override
    public UUID getUUID() {
        return this.uuid;
    }

    @Override
    public UUID getRandomUUID() {
        return UUID.randomUUID();
    }

    @Override
    public String toString() {
        return this.uuid.toString();
    }

}