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PowerShell Decorator Pattern: Enhance Logger with Timestamp and Uppercase
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| class Logger { | |
| log($message) { # Define a method called "log" that takes a message as input | |
| $message | Out-Host # Output the message to the console | |
| } | |
| } | |
| class TimeStampingLogger : Logger { # Define a class called "TimeStampingLogger" that inherits from "Logger" | |
| $logger # Declare a variable called "logger" | |
| TimeStampingLogger($logger) { # Define a constructor that takes a "logger" as input | |
| $this.logger = $logger # Assign the input "logger" to the class variable "logger" | |
| } | |
| log($message) { # Override the "log" method from the base class | |
| $now = Get-Date # Get the current date and time | |
| $this.logger.log("$now : $message") # Call the "log" method of the base class and prepend the timestamp to the message | |
| } | |
| } | |
| class UpperLogger : Logger { # Define a class called "UpperLogger" that inherits from "Logger" | |
| $logger # Declare a variable called "logger" | |
| UpperLogger($logger) { # Define a constructor that takes a "logger" as input | |
| $this.logger = $logger # Assign the input "logger" to the class variable "logger" | |
| } | |
| log($message) { # Override the "log" method from the base class | |
| $this.logger.log($message.ToUpper()) # Call the "log" method of the base class and convert the message to uppercase | |
| } | |
| } | |
| $message = "Hello World" # Define a variable called "message" and assign it the value "Hello World" | |
| $logger = [Logger]::new() # Create an instance of the "Logger" class and assign it to the variable "logger" | |
| $logger.log($message) # Call the "log" method of the "logger" instance with the "message" as input | |
| $logger = [UpperLogger]::new([TimeStampingLogger]::new([Logger]::new())) # Create an instance of the "UpperLogger" class with a nested instance of "TimeStampingLogger" and a "Logger" instance as inputs, and assign it to the variable "logger" | |
| $logger.log($message) # Call the "log" method of the "logger" instance with the "message" as input | |
| $logger = [TimeStampingLogger]::new([Logger]::new()) # Create an instance of the "TimeStampingLogger" class with a "Logger" instance as input, and assign it to the variable "logger" | |
| $logger.log($message) # Call the "log" method of the "logger" instance with the "message" as input |
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