--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/lib/XMLContentHandler.h	Sat Jun 12 20:43:07 2021 +0200
@@ -0,0 +1,70 @@
+/**
+ * Relational pipes
+ * Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+namespace relpipe {
+namespace in {
+namespace asn1 {
+namespace lib {
+
+class XMLContentHandler {
+public:
+
+	virtual ~XMLContentHandler() = default;
+
+	virtual void writeStartElement(const std::string& name, const std::vector<std::string>& attributes = {}) = 0;
+	virtual void writeEndElement() = 0;
+	virtual void writeCharacters(const std::string& text) = 0;
+	virtual void writeComment(const std::string& text, bool addSpaces = true) = 0;
+
+};
+
+class XMLContentHandlerProxy : XMLContentHandler {
+private:
+	std::vector<std::shared_ptr<XMLContentHandler>> handlers;
+public:
+
+	void addHandler(std::shared_ptr<XMLContentHandler> handler) {
+		handlers.push_back(handler);
+	}
+
+#define handler for (auto ___h : handlers) ___h
+
+	void writeStartElement(const std::string& name, const std::vector<std::string>& attributes = {}) {
+		handler->writeStartElement(name, attributes);
+	}
+
+	void writeEndElement() {
+		handler->writeEndElement();
+	}
+
+	void writeCharacters(const std::string& text) {
+		handler->writeCharacters(text);
+	}
+
+	void writeComment(const std::string& text, bool addSpaces = true) {
+		handler->writeComment(text, addSpaces);
+	}
+
+#undef handler
+
+};
+
+}
+}
+}
+}