From 780410f29dd2e1bd91b3c75502b3916013e2252e Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Wed, 3 Feb 2016 16:23:39 +0100
Subject: [PATCH] Add builtin header check: Field exists

---
 .../src/builtin/header/field_exists.rs        | 31 +++++++++++++++++++
 libimagentryfilter/src/builtin/header/mod.rs  |  3 +-
 2 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 libimagentryfilter/src/builtin/header/field_exists.rs

diff --git a/libimagentryfilter/src/builtin/header/field_exists.rs b/libimagentryfilter/src/builtin/header/field_exists.rs
new file mode 100644
index 00000000..45bc870a
--- /dev/null
+++ b/libimagentryfilter/src/builtin/header/field_exists.rs
@@ -0,0 +1,31 @@
+use libimagstore::store::Entry;
+
+use builtin::header::field_path::FieldPath;
+use filter::Filter;
+
+use toml::Value;
+
+pub struct FieldExists {
+    header_field_path: FieldPath,
+}
+
+impl FieldExists {
+
+    pub fn new(path: FieldPath) -> FieldExists {
+        FieldExists {
+            header_field_path: path,
+        }
+    }
+
+}
+
+impl Filter for FieldExists {
+
+    fn filter(&self, e: &Entry) -> bool {
+        let header = e.get_header();
+        self.header_field_path.walk(header).is_some()
+    }
+
+}
+
+
diff --git a/libimagentryfilter/src/builtin/header/mod.rs b/libimagentryfilter/src/builtin/header/mod.rs
index 1dd2cb69..886e5ce6 100644
--- a/libimagentryfilter/src/builtin/header/mod.rs
+++ b/libimagentryfilter/src/builtin/header/mod.rs
@@ -1,5 +1,6 @@
 pub mod field_eq;
+pub mod field_exists;
 pub mod field_grep;
+pub mod field_isempty;
 pub mod field_istype;
 pub mod field_path;
-