From 6b2eeff1235a32b97736a564dbc2b02bfcda3587 Mon Sep 17 00:00:00 2001
From: Daniel Burrows <dburrows@debian.org>
Date: Thu, 4 Mar 2010 09:11:02 -0800
Subject: Let client code query the components of a tier operation.

---
 src/generic/problemresolver/tier_operation.cc | 13 ++++++++++
 src/generic/problemresolver/tier_operation.h  | 34 +++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

(limited to 'src/generic/problemresolver')

diff --git a/src/generic/problemresolver/tier_operation.cc b/src/generic/problemresolver/tier_operation.cc
index 1b6e83ba..31de3808 100644
--- a/src/generic/problemresolver/tier_operation.cc
+++ b/src/generic/problemresolver/tier_operation.cc
@@ -215,6 +215,19 @@ tier_operation::op_impl::op_impl(const op_impl &op1, const op_impl &op2, lower_b
     }
 }
 
+level tier_operation::op_impl::get_user_level(level_index idx) const
+{
+
+  // "Slow" implementation right now because this isn't used much
+  // (only for display).
+  for(std::vector<std::pair<level_index, level> >::const_iterator it =
+	actions.begin(); it != actions.end(); ++it)
+    if(it->first == idx)
+      return it->second;
+
+  return level();
+}
+
 tier_operation tier_operation::least_upper_bound(const tier_operation &op1,
                                                  const tier_operation &op2)
 {
diff --git a/src/generic/problemresolver/tier_operation.h b/src/generic/problemresolver/tier_operation.h
index 62e74ecb..c6231dc1 100644
--- a/src/generic/problemresolver/tier_operation.h
+++ b/src/generic/problemresolver/tier_operation.h
@@ -124,6 +124,18 @@ class tier_operation
       return rval;
     }
 
+    int get_structural_level() const
+    {
+      return structural_level;
+    }
+
+    level get_user_level(std::size_t idx) const;
+
+    bool get_has_user_level_changes() const
+    {
+      return !actions.empty();
+    }
+
     /** \brief Test two tier operations for equality.
      *
      *  \note Relies on the fact that the level's equality comparison
@@ -320,6 +332,28 @@ public:
     get_impl().dump(out);
   }
 
+  /** \brief Get the structural level that this operation raises its
+   *  target to.
+   */
+  int get_structural_level() const
+  {
+    return get_impl().get_structural_level();
+  }
+
+  /** \brief Get the operation performed on a user level. */
+  level get_user_level(int idx) const
+  {
+    return get_impl().get_user_level(idx);
+  }
+
+  /** \brief Check whether any actions performed by the operation
+   *  affect user levels.
+   */
+  bool get_has_user_level_changes() const
+  {
+    return get_impl().get_has_user_level_changes();
+  }
+
   std::size_t get_hash_value() const
   {
     return get_impl().get_hash_value();
-- 
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