transcendental-lisp/src/environment/Environment.java

package environment;

import java.io.*;

public class Environment {

    private static final Environment instance = new Environment();

    public static Environment getInstance() {
        return instance;
    }

    private InputStream input;
    private PrintStream output;
    private PrintStream errorOutput;
    private Runnable terminate;

    private Environment() {}

    public void setInput(InputStream input) {
        this.input = input;
    }

    public void setOutput(PrintStream output) {
        this.output = output;
    }

    public void setErrorOutput(PrintStream errorOutput) {
        this.errorOutput = errorOutput;
    }

    public void setTerminate(Runnable terminate) {
        this.terminate = terminate;
    }

    public InputStream getInput() {
        return input;
    }

    public String getInputName() {
        return input.toString();
    }

    public PrintStream getOutput() {
        return output;
    }

    public PrintStream getErrorOutput() {
        return errorOutput;
    }

    public void terminate() {
        terminate.run();
    }

}