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Security infrastructure used in greetgo!

There is a newer version: 0.0.12

package kz.greetgo.security.session;

import kz.greetgo.security.crypto.Crypto;

public class SessionServiceBuilder {
  SessionStorage storage;
  SaltGenerator saltGenerator;

  int oldSessionAgeInHours = 24;
  int sessionIdLength = 15;
  int tokenLength = 15;

  private SessionServiceBuilder() {}

  public static SessionServiceBuilder newBuilder() {
    return new SessionServiceBuilder();
  }

  public SessionServiceBuilder setStorage(SessionStorage storage) {
    checkBuilt();
    this.storage = storage;
    return this;
  }

  private boolean built = false;

  private void checkBuilt() {
    if (built) throw new RuntimeException("Already built");
  }

  public SessionServiceBuilder setSaltGenerator(SaltGenerator saltGenerator) {
    checkBuilt();
    this.saltGenerator = saltGenerator;
    return this;
  }

  public SessionServiceBuilder setSaltGeneratorOnCrypto(Crypto crypto, int saltLength) {
    checkBuilt();
    this.saltGenerator = new SaltGeneratorCryptoBridge(crypto, saltLength);
    return this;
  }

  public SessionServiceBuilder setOldSessionAgeInHours(int oldSessionAgeInHours) {
    checkBuilt();
    this.oldSessionAgeInHours = oldSessionAgeInHours;
    return this;
  }

  public SessionServiceBuilder setSessionIdLength(int sessionIdLength) {
    checkBuilt();
    this.sessionIdLength = sessionIdLength;
    return this;
  }

  public SessionServiceBuilder setTokenLength(int tokenLength) {
    checkBuilt();
    this.tokenLength = tokenLength;
    return this;
  }

  public SessionService build() {
    built = true;
    if (storage == null) throw new RuntimeException("No sessionStorage");
    if (saltGenerator == null) throw new RuntimeException("No saltGenerator");
    return new SessionServiceImpl(this);
  }
}