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Refactor internal link helpers into trait

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Matthias Beyer 2016-02-15 13:26:00 +01:00
parent 1e17b10568
commit defec535c8
1 changed files with 41 additions and 19 deletions
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42
libimaglink/src/internal.rs
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@ -7,31 +7,53 @@ use result::Result;
use toml::Value;
pub fn get_links(header: &EntryHeader) -> Result<Links> {
process_rw_result(header.read("imag.links"))
pub trait InternalLinker {
/// Get the internal links from the implementor object
fn get_internal_links(&self) -> Result<Links>;
/// Set the internal links for the implementor object
fn set_internal_links(&mut self, links: Links) -> Result<Links>;
/// Add an internal link to the implementor object
fn add_internal_link(&mut self, link: Link) -> Result<()>;
/// Remove an internal link from the implementor object
fn remove_internal_link(&mut self, link: Link) -> Result<()>;
}
impl InternalLinker for EntryHeader {
fn get_internal_links(self: &EntryHeader) -> Result<Links> {
process_rw_result(self.read("imag.links"))
}
/// Set the links in a header and return the old links, if any.
pub fn set_links(header: &mut EntryHeader, links: Links) -> Result<Links> {
fn set_internal_links(&mut self, links: Links) -> Result<Links> {
let links : Vec<Link> = links.into();
let links : Vec<Value> = links.into_iter().map(|link| Value::String(link.into())).collect();
process_rw_result(header.set("imag.links", Value::Array(links)))
process_rw_result(self.set("imag.links", Value::Array(links)))
}
pub fn add_link(header: &mut EntryHeader, link: Link) -> Result<()> {
get_links(header).and_then(|mut links| {
fn add_internal_link(&mut self, link: Link) -> Result<()> {
self.get_internal_links()
.and_then(|mut links| {
links.add(link);
set_links(header, links).map(|_| ())
self.set_internal_links(links).map(|_| ())
})
}
pub fn remove_link(header: &mut EntryHeader, link: Link) -> Result<()> {
get_links(header).and_then(|mut links| {
fn remove_internal_link(&mut self, link: Link) -> Result<()> {
self.get_internal_links()
.and_then(|mut links| {
links.remove(link);
set_links(header, links).map(|_| ())
self.set_internal_links(links).map(|_| ())
})
}
}
fn process_rw_result(links: StoreResult<Option<Value>>) -> Result<Links> {
if links.is_err() {
let lerr = LinkError::new(LinkErrorKind::EntryHeaderReadError,