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A persistence scheduler system based on Spring framework

There is a newer version: 0.2.11

package com.lifeonwalden.springscheduling.cronBuilder;

import com.lifeonwalden.springscheduling.cronBuilder.model.All;
import com.lifeonwalden.springscheduling.cronBuilder.model.FieldDefinition;
import com.lifeonwalden.springscheduling.cronBuilder.time.Day;
import com.lifeonwalden.springscheduling.cronBuilder.time.Hour;
import com.lifeonwalden.springscheduling.cronBuilder.time.Minute;
import com.lifeonwalden.springscheduling.cronBuilder.time.Month;
import com.lifeonwalden.springscheduling.cronBuilder.time.Second;
import com.lifeonwalden.springscheduling.cronBuilder.time.Weekday;

public class CronBuilder {
  private FieldDefinition second = new All();
  private FieldDefinition minute = new All();
  private FieldDefinition hour = new All();
  private FieldDefinition day = new All();
  private FieldDefinition month = new All();
  private FieldDefinition weekday = new All();

  public static CronBuilder build() {
    return new CronBuilder();
  }

  public CronBuilder second(FieldDefinition def) {
    if (!def.isValid(Second.class)) {
      throw new RuntimeException("Invalid field definition");
    }
    this.second = def;

    return this;
  }

  public CronBuilder minute(FieldDefinition def) {
    if (!def.isValid(Minute.class)) {
      throw new RuntimeException("Invalid field definition");
    }
    this.minute = def;

    return this;
  }

  public CronBuilder hour(FieldDefinition def) {
    if (!def.isValid(Hour.class)) {
      throw new RuntimeException("Invalid field definition");
    }
    this.hour = def;

    return this;
  }

  public CronBuilder day(FieldDefinition def) {
    if (!def.isValid(Day.class)) {
      throw new RuntimeException("Invalid field definition");
    }
    this.day = def;

    return this;
  }

  public CronBuilder month(FieldDefinition def) {
    if (!def.isValid(Month.class)) {
      throw new RuntimeException("Invalid field definition");
    }
    this.month = def;

    return this;
  }

  public CronBuilder weekday(FieldDefinition def) {
    if (!def.isValid(Weekday.class)) {
      throw new RuntimeException("Invalid field definition");
    }
    this.weekday = def;

    return this;
  }

  public String toCronExpression() {
    StringBuilder sb = new StringBuilder();
    sb.append(second.toExpression()).append(" ").append(minute.toExpression()).append(" ").append(hour.toExpression())
        .append(" ").append(day.toExpression()).append(" ").append(month.toExpression()).append(" ")
        .append(weekday.toExpression());

    return sb.toString();
  }
}