Facility to read and write scaped values to properties file

property_facility.groovy

class Property {

  def static Properties instance

  public static readProps(String file_name_prop) {
    if (!file_name_prop) throw new Exception("You must provide filename to read properties: this is a static method")
    def file_prop = new File(file_name_prop)
    if (!file_prop.exists()) {
      throw new Exception("The file ${file_name_prop} must exists")
    }
    def props = new Properties()
    file_prop.withInputStream {
      stream -> props.load(stream)
    }
    Property.instance = props
    props
  }

  static void set(String key, String value) {
    instance.setProperty(key, value)
  }

  static void save(String file_name_prop) {
    if (!file_name_prop) throw new Exception("You must provide filename to save properties: this is a static method")
    def file = new File(file_name_prop)
    file.withWriter('UTF-8') { fileWriter ->
      instance.each { key, value ->
        fileWriter.writeLine("${key}=${value}")
      }
    }
  }

}