From ddba2b97ba27636f9f6f6ae1bef9781fb8ea5f0c Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Tue, 15 Jan 2008 20:01:24 +0000
Subject: SLV2 0.4.4.

git-svn-id: http://svn.drobilla.net/lad/slv2@1054 a436a847-0d15-0410-975c-d299462d15a1
---
 slv2/plugin.h | 12 ++++++++++++
 src/plugin.c  | 25 +++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/slv2/plugin.h b/slv2/plugin.h
index 3a386fc..e4e5984 100644
--- a/slv2/plugin.h
+++ b/slv2/plugin.h
@@ -194,6 +194,18 @@ slv2_plugin_get_value_for_subject(SLV2Plugin  p,
                                   const char* predicate);
 
 
+/** Return whether a feature is supported by a plugin.
+ *
+ * This will return true if the feature is an optional or required feature
+ * of the plugin.
+ *
+ * Time = Query
+ */
+bool
+slv2_plugin_has_feature(SLV2Plugin  p,
+                        const char* feature);
+
+
 /** Get the LV2 Features supported (required or optionally) by a plugin.
  *
  * A feature is "supported" by a plugin if it is required OR optional.
diff --git a/src/plugin.c b/src/plugin.c
index bd7f89e..babb65a 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -528,6 +528,31 @@ slv2_plugin_get_latency_port(SLV2Plugin p)
 	return slv2_value_as_int(val);
 }
 
+	
+bool
+slv2_plugin_has_feature(SLV2Plugin  p,
+                        const char* feature)
+{
+	assert(feature);
+
+    const char* const query = slv2_strjoin(
+		"ASK {\n"
+		"	{ <>  lv2:optionalFeature <", feature, "> }\n"
+		"	UNION\n"
+		"	{ <>  lv2:requiredFeature <", feature, "> }\n"
+		"}\n", NULL);
+
+
+	librdf_query_results* results = slv2_plugin_query(p, query);
+	assert(librdf_query_results_is_boolean(results));
+
+	const bool ret = results && (librdf_query_results_get_boolean(results) > 0);
+
+	librdf_free_query_results(results);
+
+	return ret;
+}
+
 
 SLV2Values
 slv2_plugin_get_supported_features(SLV2Plugin p)
-- 
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