CommandLine.java

interface Builder {
		interface Buffer<Return> extends Output<Return> {
			Return __build(OutputStream err,
			               OutputStream out,
			               boolean redirect,
			               Number buffer) throws IOException;
			
			@Override
			default Return __build(OutputStream err,
			                       OutputStream out,
			                       boolean redirect) throws IOException {
				return __build(err, out, redirect, 1024);
			}
			
			default Output<Return> buffer(Number buffer) {
				return (err, out, redirect) -> __build(err, out, redirect, buffer);
			}
		}
		
		interface Output<Return> extends Errors<Return> {
			Return __build(OutputStream err,
			               OutputStream out,
			               boolean redirect) throws IOException;
			
			@Override
			default Return __build(OutputStream err, boolean redirect) throws IOException {
				return __build(err, null, redirect);
			}
			
			default Errors.Redirect<Return> pipeOutput(OutputStream out) {
				return (err, redirect) -> __build(err, out, redirect);
			}
		}
		
		interface Errors<Return> {
			Return __build(OutputStream err,
			               boolean redirect) throws IOException;
			
			default Return pipeErrors(OutputStream err) throws IOException {
				return __build(err, false);
			}
			
			default Return ignoreErrors() throws IOException {
				return __build(null, true);
			}
			
			interface Redirect<Return> extends Errors<Return> {
				default Return redirectErrors() throws IOException {
					return __build(null, true);
				}
				
				@Override
				default Return ignoreErrors() throws IOException {
					return __build(null, false);
				}
			}
		}
	}
	
	public static Builder.Buffer<CommandLine> create(String command) {
		return (err, out, redirect, buffer) ->
				new CommandLine(command, err, out, redirect, buffer.intValue());
	}
	
	private CommandLine(String command,
	                    OutputStream out,
	                    OutputStream err,
	                    boolean redirect,
	                    int buffer) throws IOException {