Module jdk.jshell
Package jdk.jshell.tool

Interface JavaShellToolBuilder

  • public interface JavaShellToolBuilder
    Interface to configure and run a Java shell tool instance. An instance of the builder is created with the static builder() method. This builder can, optionally, be configured with the configuration methods. All configuration methods return the builder instance for use in chained initialization. All configuration methods have sensible defaults which will be used if they are not called.. After zero or more calls to configuration methods, the tool is launched with a call to run(java.lang.String...).
    Since:
    9

    • Method Detail

      • builder

        static JavaShellToolBuilder builder()
        Create a builder for launching the JDK jshell tool.
        Returns:
        a builder which can be used to configure and launch the jshell tool

      • in

        JavaShellToolBuilder in​(InputStream cmdIn,
                        InputStream userIn)
        Set the input channels.
        Implementation Requirements:
        If this method is not called, the behavior should be equivalent to calling in(System.in, null).
        Parameters:
        cmdIn - source of command input
        userIn - source of input for running user code, or null to extract user input from cmdIn
        Returns:
        the JavaShellToolBuilder instance

      • out

        JavaShellToolBuilder out​(PrintStream output)
        Set the output channels. Same as out(output, output, output).
        Implementation Requirements:
        If neither out method is called, the behavior should be equivalent to calling out(System.out).
        Parameters:
        output - destination of command feedback, console interaction, and user code output
        Returns:
        the JavaShellToolBuilder instance

      • out

        JavaShellToolBuilder out​(PrintStream cmdOut,
                         PrintStream console,
                         PrintStream userOut)
        Set the output channels.
        Implementation Requirements:
        If neither out method is called, the behavior should be equivalent to calling out(System.out, System.out, System.out).
        Parameters:
        cmdOut - destination of command feedback including error messages for users
        console - destination of console interaction
        userOut - destination of user code output. For example, user snippet System.out.println("Hello") when executed Hello goes to userOut.
        Returns:
        the JavaShellToolBuilder instance

      • err

        JavaShellToolBuilder err​(PrintStream error)
        Set the error channels. Same as err(error, error).
        Implementation Requirements:
        If neither err method is called, the behavior should be equivalent to calling err(System.err).
        Parameters:
        error - destination of tool errors, and user code errors
        Returns:
        the JavaShellToolBuilder instance

      • err

        JavaShellToolBuilder err​(PrintStream cmdErr,
                         PrintStream userErr)
        Set the error channels.
        Implementation Requirements:
        If neither err method is called, the behavior should be equivalent to calling err(System.err, System.err, System.err).
        Parameters:
        cmdErr - destination of tool start-up and fatal errors
        userErr - destination of user code error output. For example, user snippet System.err.println("Oops") when executed Oops goes to userErr.
        Returns:
        the JavaShellToolBuilder instance

      • persistence

        JavaShellToolBuilder persistence​(Preferences prefs)
        Set the storage mechanism for persistent information which includes input history and retained settings.
        Implementation Requirements:
        If neither persistence method is called, the behavior should be to use the tool's standard persistence mechanism.
        Parameters:
        prefs - an instance of Preferences that is used to retrieve and store persistent information
        Returns:
        the JavaShellToolBuilder instance

      • persistence

        JavaShellToolBuilder persistence​(Map<String,​String> prefsMap)
        Set the storage mechanism for persistent information which includes input history and retained settings.
        Implementation Requirements:
        If neither persistence method is called, the behavior should be to use the tool's standard persistence mechanism.
        Parameters:
        prefsMap - an instance of Map that is used to retrieve and store persistent information
        Returns:
        the JavaShellToolBuilder instance

      • env

        JavaShellToolBuilder env​(Map<String,​String> vars)
        Set the source for environment variables.
        Implementation Requirements:
        If this method is not called, the behavior should be equivalent to calling env(System.getenv()).
        Parameters:
        vars - the Map of environment variable names to values
        Returns:
        the JavaShellToolBuilder instance

      • locale

        JavaShellToolBuilder locale​(Locale locale)
        Set the locale.
        Implementation Requirements:
        If this method is not called, the behavior should be equivalent to calling locale(Locale.getDefault()).
        Parameters:
        locale - the locale
        Returns:
        the JavaShellToolBuilder instance

      • promptCapture

        JavaShellToolBuilder promptCapture​(boolean capture)
        Set to enable a command capturing prompt override.
        Implementation Requirements:
        If this method is not called, the behavior should be equivalent to calling promptCapture(false).
        Parameters:
        capture - if true, basic prompt is the ENQ character and continuation prompt is the ACK character. If false, prompts are as set with set-up or user /set commands.
        Returns:
        the JavaShellToolBuilder instance

      • run

        void run​(String... arguments)
  throws Exception
        Run an instance of the Java shell tool as configured by the other methods in this interface. This call is not destructive, more than one call of this method may be made from a configured builder. The exit code from the Java shell tool is ignored.
        Parameters:
        arguments - the command-line arguments (including options), if any
        Throws:
        Exception - an unexpected fatal exception

      • start

        default int start​(String... arguments)
           throws Exception
        Run an instance of the Java shell tool as configured by the other methods in this interface. This call is not destructive, more than one call of this method may be made from a configured builder.
        Implementation Requirements:
        The default implementation always returns zero. Implementations of this interface should override this method, returning the exit status.
        Parameters:
        arguments - the command-line arguments (including options), if any
        Returns:
        the exit status with which the tool explicitly exited (if any), otherwise 0 for success or 1 for failure
        Throws:
        Exception - an unexpected fatal exception