PROPOSAL: Named and Optional parameters, "Java-style"

[Frédéric Martini]

This "error" is present on the new File API from Java 7...


I'm agree that a builder can be a better choice.
But, IMHO, the builder is not the best solution, it's only the least
worst option...
It's very painful and boring to write, and it's not easily extendable.





Same example with a Builder :



enum OpenMode { APPEND, TRUNCATE }
enum CreateMode { CREATE, CREATE_IF_NEW, DO_NO_CREATE }
enum SyncMode { NONE, SYNC, DSYNC }

static class OpenOptions {
	private boolean followLinks = true;
	private OpenMode open = OpenMode.TRUNCATE;
	private CreateMode create = CreateMode.CREATE;
	private SyncMode syn = SyncMode.NONE;
	private boolean deleteOnClose = false;
	private boolean sparse = false;
	
	public boolean isFollowLinks() {
		return followLinks;
	}
	public OpenOptions setFollowLinks(boolean followLinks) {
		this.followLinks = followLinks;
		return this;
	}
	public OpenMode getOpen() {
		return open;
	}
	public OpenOptions setOpen(OpenMode open) {
		this.open = open;
		return this;
	}
	public CreateMode getCreate() {
		return create;
	}
	public OpenOptions setCreate(CreateMode create) {
		this.create = create;
		return this;
	}
	public SyncMode getSyn() {
		return syn;
	}
	public OpenOptions setSyn(SyncMode syn) {
		this.syn = syn;
		return this;
	}
	public boolean isDeleteOnClose() {
		return deleteOnClose;
	}
	public OpenOptions setDeleteOnClose(boolean deleteOnClose) {
		this.deleteOnClose = deleteOnClose;
		return this;
	}
	public boolean isSparse() {
		return sparse;
	}
	public OpenOptions setSparse(boolean sparse) {
		this.sparse = sparse;
		return this;
	}
}

OutputStream newOutputStream(Path path, OpenOptions options);



Fred,


2011/9/1 向雅 <fyaoxy at gmail.com>:
> Again, It's problem of design.
> That example just need some kind of factory or builder to reuse.
>
> Don't make error for existed error!
>
> My words is simple, and the logic is simple as well.
>
> If someone not like USA(not american, not US, just only USA soo), then
> such as tuple return value or typed vary parameter more helpfull.
>
> Cheers,
> Qinxian
>
>