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+/*
+ * Copyright (c) 2003-2009, John Wiegley.  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 New Artisans LLC 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 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 COPYRIGHT
+ * OWNER 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.
+ */
+
+/**
+ * @defgroup report Reporting
+ */
+
+/**
+ * @file   session.h
+ * @author John Wiegley
+ *
+ * @ingroup report
+ */
+#ifndef _SESSION_H
+#define _SESSION_H
+
+#include "interactive.h"
+#include "account.h"
+#include "journal.h"
+#include "option.h"
+#include "commodity.h"
+
+namespace ledger {
+
+class commodity_pool_t;
+class xact_t;
+
+class session_t : public symbol_scope_t
+{
+  friend void set_session_context(session_t * session);
+
+public:
+  bool			   flush_on_next_data_file;
+  date_t::year_type	   current_year;
+  std::auto_ptr<journal_t> journal;
+
+  explicit session_t();
+  virtual ~session_t() {
+    TRACE_DTOR(session_t);
+  }
+
+  void set_flush_on_next_data_file(const bool truth) {
+    flush_on_next_data_file = truth;
+  }
+
+  std::size_t read_data(const string& master_account = "");
+
+  void read_journal_files();
+  void close_journal_files();
+
+  void report_options(std::ostream& out)
+  {
+    HANDLER(cache_).report(out);
+    HANDLER(download).report(out);
+    HANDLER(european).report(out);
+    HANDLER(file_).report(out);
+    HANDLER(input_date_format_).report(out);
+    HANDLER(master_account_).report(out);
+    HANDLER(price_db_).report(out);
+    HANDLER(price_exp_).report(out);
+    HANDLER(strict).report(out);
+  }
+
+  option_t<session_t> * lookup_option(const char * p);
+
+  virtual expr_t::ptr_op_t lookup(const symbol_t::kind_t kind,
+				  const string& name);
+
+  /**
+   * Option handlers
+   */
+
+  OPTION(session_t, cache_);
+  OPTION(session_t, download); // -Q
+
+  OPTION_(session_t, european, DO() {
+      commodity_t::european_by_default = true;
+    });
+
+  OPTION__
+  (session_t, price_exp_, // -Z
+   CTOR(session_t, price_exp_) { value = 24L * 3600L; }
+   DO_(args) {
+     value = args[1].to_long() * 60L;
+   });
+
+  OPTION__
+  (session_t, file_, // -f
+   std::list<path> data_files;
+   CTOR(session_t, file_) {}
+   DO_(args) {
+     assert(args.size() == 2);
+     if (parent->flush_on_next_data_file) {
+       data_files.clear();
+       parent->flush_on_next_data_file = false;
+     }
+     data_files.push_back(args[1].as_string());
+   });
+
+  OPTION_(session_t, input_date_format_, DO_(args) {
+      // This changes static variables inside times.h, which affects the basic
+      // date parser.
+      set_input_date_format(args[1].as_string().c_str());
+    });
+
+  OPTION(session_t, master_account_);
+  OPTION(session_t, price_db_);
+  OPTION(session_t, strict);
+};
+
+/**
+ * Set the current session context, transferring all static globals to point
+ * at the data structures related to this session.  Although Ledger itself is
+ * not thread-safe, by locking, switching session context, then unlocking
+ * after an operation is done, multiple threads can sequentially make use of
+ * the library.  Thus, a session_t maintains all of the information relating
+ * to a single usage of the Ledger library.
+ */
+void set_session_context(session_t * session);
+
+} // namespace ledger
+
+#endif // _SESSION_H