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+/**
+ * Copyright (c) 2015, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * 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.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 filter_observer_hh
+#define filter_observer_hh
+
+#include <sys/types.h>
+
+#include "logfile.hh"
+#include "textview_curses.hh"
+
+class line_filter_observer : public logline_observer {
+public:
+    line_filter_observer(filter_stack& fs, std::shared_ptr<logfile> lf)
+        : lfo_filter_stack(fs), lfo_filter_state(lf)
+    {
+    }
+
+    void logline_restart(const logfile& lf, file_size_t rollback_size) override
+    {
+        for (auto& filter : this->lfo_filter_stack) {
+            filter->revert_to_last(this->lfo_filter_state, rollback_size);
+        }
+    }
+
+    void logline_new_lines(const logfile& lf,
+                           logfile::const_iterator ll_begin,
+                           logfile::const_iterator ll_end,
+                           shared_buffer_ref& sbr) override;
+
+    void logline_eof(const logfile& lf) override;
+
+    bool excluded(uint32_t filter_in_mask,
+                  uint32_t filter_out_mask,
+                  size_t offset) const
+    {
+        bool filtered_in = (filter_in_mask == 0)
+            || (this->lfo_filter_state.tfs_mask[offset] & filter_in_mask) != 0;
+        bool filtered_out
+            = (this->lfo_filter_state.tfs_mask[offset] & filter_out_mask) != 0;
+        return !filtered_in || filtered_out;
+    }
+
+    size_t get_min_count(size_t max) const;
+
+    void clear_deleted_filter_state();
+
+    filter_stack& lfo_filter_stack;
+    logfile_filter_state lfo_filter_state;
+};
+
+#endif