1 files changed, 47 insertions, 0 deletions
diff --git a/decoder/sentence_metadata.h b/decoder/sentence_metadata.h
new file mode 100644
index 00000000..ef9eb388
--- /dev/null
+++ b/decoder/sentence_metadata.h
@@ -0,0 +1,47 @@
+#ifndef _SENTENCE_METADATA_H_
+#define _SENTENCE_METADATA_H_
+
+#include <cassert>
+#include "lattice.h"
+
+struct SentenceMetadata {
+  SentenceMetadata(int id, const Lattice& ref) :
+    sent_id_(id),
+    src_len_(-1),
+    has_reference_(ref.size() > 0),
+    trg_len_(ref.size()),
+    ref_(has_reference_ ? &ref : NULL) {}
+
+  // this should be called by the Translator object after
+  // it has parsed the source
+  void SetSourceLength(int sl) { src_len_ = sl; }
+
+  // this should be called if a separate model needs to
+  // specify how long the target sentence should be
+  void SetTargetLength(int tl) {
+    assert(!has_reference_);
+    trg_len_ = tl;
+  }
+  bool HasReference() const { return has_reference_; }
+  const Lattice& GetReference() const { return *ref_; }
+  int GetSourceLength() const { return src_len_; }
+  int GetTargetLength() const { return trg_len_; }
+  int GetSentenceID() const { return sent_id_; }
+  // this will be empty if the translator accepts non FS input!
+  const Lattice& GetSourceLattice() const { return src_lattice_; }
+
+ private:
+  const int sent_id_;
+  // the following should be set, if possible, by the Translator
+  int src_len_;
+ public:
+  Lattice src_lattice_;  // this will only be set if inputs are finite state!
+ private:
+  // you need to be very careful when depending on these values
+  // they will only be set during training / alignment contexts
+  const bool has_reference_;
+  int trg_len_;
+  const Lattice* const ref_;
+};
+
+#endif