transcendental-lisp/src/environment/RuntimeEnvironment.java

package environment;

import java.io.*;

public class RuntimeEnvironment {

    private static RuntimeEnvironment uniqueInstance = new RuntimeEnvironment();

    public static RuntimeEnvironment getInstance() {
        return uniqueInstance;
    }

    private InputStream input;
    private PrintStream output;
    private PrintStream errorOutput;
    private Runnable terminationFunction;
    private Runnable errorTerminationFunction;

    private RuntimeEnvironment() {}

    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 setTerminationFunction(Runnable terminationFunction) {
        this.terminationFunction = terminationFunction;
    }

    public void setErrorTerminationFunction(Runnable errorTerminationFunction) {
        this.errorTerminationFunction = errorTerminationFunction;
    }

    public InputStream getInput() {
        return input;
    }

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

    public PrintStream getOutput() {
        return output;
    }

    public PrintStream getErrorOutput() {
        return errorOutput;
    }

    public void terminateSuccessfully() {
        terminationFunction.run();
    }
    
    public void terminateExceptionally() {
        errorTerminationFunction.run();
    }

}