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//
// imag - the personal information management suite for the commandline
// Copyright (C) 2015, 2016 Matthias Beyer <mail@beyermatthias.de> and contributors
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; version
// 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
use std::path::PathBuf;
use toml_query::insert::TomlValueInsertExt;
use toml_query::read::TomlValueReadExt;
use toml::Value;
use libimagstore::store::Store;
use libimagstore::store::FileLockEntry;
use libimagstore::storeid::StoreId;
use libimagstore::storeid::StoreIdIterator;
use libimagerror::into::IntoError;
use category::Category;
use error::CategoryErrorKind as CEK;
use error::ResultExt;
use result::Result;
pub const CATEGORY_REGISTER_NAME_FIELD_PATH : &'static str = "category.register.name";
/// Extension on the Store to make it a register for categories
///
/// The register writes files to the
pub trait CategoryRegister {
fn category_exists(&self, name: &str) -> Result<bool>;
fn create_category(&self, name: &str) -> Result<bool>;
fn delete_category(&self, name: &str) -> Result<()>;
fn all_category_names(&self) -> Result<CategoryNameIter>;
fn get_category_by_name(&self, name: &str) -> Result<Option<FileLockEntry>>;
}
impl CategoryRegister for Store {
/// Check whether a category exists
fn category_exists(&self, name: &str) -> Result<bool> {
let sid = try!(mk_category_storeid(self.path().clone(), name));
represents_category(self, sid, name)
}
/// Create a category
///
/// Fails if the category already exists (returns false then)
fn create_category(&self, name: &str) -> Result<bool> {
use libimagstore::error::StoreErrorKind as SEK;
let sid = try!(mk_category_storeid(self.path().clone(), name));
match self.create(sid) {
Ok(mut entry) => {
let val = Value::String(String::from(name));
entry.get_header_mut()
.insert(CATEGORY_REGISTER_NAME_FIELD_PATH, val)
.map(|opt| if opt.is_none() {
debug!("Setting category header worked")
} else {
warn!("Setting category header replaced existing value: {:?}", opt);
})
.map(|_| true)
.chain_err(|| CEK::HeaderWriteError)
.chain_err(|| CEK::StoreWriteError)
}
Err(store_error) => if is_match!(store_error.kind(), &SEK::EntryAlreadyExists) {
Ok(false)
} else {
Err(store_error).chain_err(|| CEK::StoreWriteError)
}
}
}
/// Delete a category
fn delete_category(&self, name: &str) -> Result<()> {
let sid = try!(mk_category_storeid(self.path().clone(), name));
self.delete(sid).chain_err(|| CEK::StoreWriteError)
}
/// Get all category names
fn all_category_names(&self) -> Result<CategoryNameIter> {
self.retrieve_for_module("category")
.chain_err(|| CEK::StoreReadError)
.map(|iter| CategoryNameIter::new(self, iter))
}
/// Get a category by its name
///
/// Returns the FileLockEntry which represents the category, so one can link to it and use it
/// like a normal file in the store (which is exactly what it is).
fn get_category_by_name(&self, name: &str) -> Result<Option<FileLockEntry>> {
let sid = try!(mk_category_storeid(self.path().clone(), name));
self.get(sid)
.chain_err(|| CEK::StoreWriteError)
}
}
#[cfg(test)]
mod tests {
extern crate env_logger;
use std::path::PathBuf;
use super::*;
use libimagstore::store::Store;
pub fn get_store() -> Store {
use libimagstore::store::InMemoryFileAbstraction;
let backend = Box::new(InMemoryFileAbstraction::new());
Store::new_with_backend(PathBuf::from("/"), None, backend).unwrap()
}
#[test]
fn test_non_existing_category_exists() {
let exists = get_store().category_exists("nonexistent");
assert!(exists.is_ok(), format!("Expected Ok(_), got: {:?}", exists));
let exists = exists.unwrap();
assert!(!exists);
}
#[test]
fn test_creating_category() {
let category_name = "examplecategory";
let store = get_store();
let res = store.create_category(category_name);
assert!(res.is_ok(), format!("Expected Ok(_), got: {:?}", res));
let res = res.unwrap();
assert!(res);
}
#[test]
fn test_creating_category_creates_store_entry() {
let category_name = "examplecategory";
let store = get_store();
let res = store.create_category(category_name);
assert!(res.is_ok(), format!("Expected Ok(_), got: {:?}", res));
let res = res.unwrap();
assert!(res);
let category = store.get(PathBuf::from(format!("category/{}", category_name)));
assert!(category.is_ok(), format!("Expected Ok(_), got: {:?}", category));
let category = category.unwrap();
assert!(category.is_some());
}
#[test]
fn test_creating_category_creates_store_entry_with_header_field_set() {
let _ = env_logger::init();
let category_name = "examplecategory";
let store = get_store();
let res = store.create_category(category_name);
assert!(res.is_ok(), format!("Expected Ok(_), got: {:?}", res));
let res = res.unwrap();
assert!(res);
let id = PathBuf::from(format!("category/{}", category_name));
println!("Trying: {:?}", id);
let category = store.get(id);
assert!(category.is_ok(), format!("Expected Ok(_), got: {:?}", category));
let category = category.unwrap();
assert!(category.is_some());
let category = category.unwrap();
let header_field = category.get_header().read(CATEGORY_REGISTER_NAME_FIELD_PATH);
assert!(header_field.is_ok(), format!("Expected Ok(_), got: {:?}", header_field));
let header_field = header_field.unwrap();
match header_field {
Some(&Value::String(ref s)) => assert_eq!(category_name, s),
Some(_) => assert!(false, "Header field has wrong type"),
None => assert!(false, "Header field not present"),
}
}
}
#[inline]
fn mk_category_storeid(base: PathBuf, s: &str) -> Result<StoreId> {
use libimagstore::storeid::IntoStoreId;
::module_path::ModuleEntryPath::new(s)
.into_storeid()
.map(|id| id.with_base(base))
.chain_err(|| CEK::StoreIdHandlingError)
}
#[inline]
fn represents_category(store: &Store, sid: StoreId, name: &str) -> Result<bool> {
sid.exists()
.chain_err(|| CEK::StoreIdHandlingError)
.and_then(|bl| {
if bl {
store.get(sid)
.chain_err(|| CEK::StoreReadError)
.and_then(|fle| {
if let Some(fle) = fle {
match fle.get_header()
.read(&String::from(CATEGORY_REGISTER_NAME_FIELD_PATH))
.chain_err(|| CEK::HeaderReadError)
{
Ok(Some(&Value::String(ref s))) => Ok(s == name),
Ok(_) => Err(CEK::TypeError.into_error()),
Err(e) => Err(e).chain_err(|| CEK::HeaderReadError),
}
} else {
Ok(false)
}
})
} else {
Ok(bl) // false
}
})
}
/// Iterator for Category names
///
/// Iterates over Result<Category>
///
/// # Return values
///
/// In each iteration, a Option<Result<Category>> is returned. Error kinds are as follows:
///
/// * CategoryErrorKind::StoreReadError if a name could not be fetched from the store
/// * CategoryErrorKind::HeaderReadError if the header of the fetched item couldn't be read
/// * CategoryErrorKind::TypeError if the name could not be fetched because it is not a String
///
pub struct CategoryNameIter<'a>(&'a Store,
|