java: new helper library for the Android port

src/java/Class.hxx

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2010-2011 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JAVA_CLASS_HXX
+#define JAVA_CLASS_HXX
+
+#include "Ref.hxx"
+
+#include <assert.h>
+
+namespace Java {
+	/**
+	 * Wrapper for a local "jclass" reference.
+	 */
+	class Class : public Java::LocalRef<jclass> {
+	public:
+		Class(JNIEnv *env, jclass cls)
+			:LocalRef<jclass>(env, cls) {}
+
+		Class(JNIEnv *env, const char *name)
+			:LocalRef<jclass>(env, env->FindClass(name)) {}
+	};
+
+	/**
+	 * Wrapper for a global "jclass" reference.
+	 */
+	class TrivialClass : public TrivialRef<jclass> {
+	public:
+		void Find(JNIEnv *env, const char *name) {
+			assert(env != nullptr);
+			assert(name != nullptr);
+
+			jclass cls = env->FindClass(name);
+			assert(cls != nullptr);
+
+			Set(env, cls);
+			env->DeleteLocalRef(cls);
+		}
+
+		bool FindOptional(JNIEnv *env, const char *name) {
+			assert(env != nullptr);
+			assert(name != nullptr);
+
+			jclass cls = env->FindClass(name);
+			if (cls == nullptr) {
+				env->ExceptionClear();
+				return false;
+			}
+
+			Set(env, cls);
+			env->DeleteLocalRef(cls);
+			return true;
+		}
+	};
+}
+
+#endif