diff options
Diffstat (limited to 'lib/entry/libimagentryfilter/src/builtin/header/field_predicate.rs')
-rw-r--r-- | lib/entry/libimagentryfilter/src/builtin/header/field_predicate.rs | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/lib/entry/libimagentryfilter/src/builtin/header/field_predicate.rs b/lib/entry/libimagentryfilter/src/builtin/header/field_predicate.rs new file mode 100644 index 00000000..45aa332c --- /dev/null +++ b/lib/entry/libimagentryfilter/src/builtin/header/field_predicate.rs @@ -0,0 +1,65 @@ +// +// 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 libimagstore::store::Entry; +use libimagstore::toml_ext::TomlValueExt; + +use builtin::header::field_path::FieldPath; +use filters::filter::Filter; + +use toml::Value; + +pub trait Predicate { + fn evaluate(&self, Value) -> bool; +} + +/// Check whether certain header field in a entry is equal to a value +pub struct FieldPredicate<P: Predicate> { + header_field_path: FieldPath, + predicate: Box<P>, +} + +impl<P: Predicate> FieldPredicate<P> { + + pub fn new(path: FieldPath, predicate: Box<P>) -> FieldPredicate<P> { + FieldPredicate { + header_field_path: path, + predicate: predicate, + } + } + +} + +impl<P: Predicate> Filter<Entry> for FieldPredicate<P> { + + fn filter(&self, e: &Entry) -> bool { + e.get_header() + .read(&self.header_field_path[..]) + .map(|val| { + match val { + None => false, + Some(v) => (*self.predicate).evaluate(v), + } + }) + .unwrap_or(false) + } + +} + + |