1 files changed, 68 insertions, 0 deletions
diff --git a/debian/htdig/htdig-3.2.0b6/htsearch/OperatorQuery.h b/debian/htdig/htdig-3.2.0b6/htsearch/OperatorQuery.h
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+++ b/debian/htdig/htdig-3.2.0b6/htsearch/OperatorQuery.h
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+#ifndef _OperatorQuery_h_
+#define _OperatorQuery_h_
+
+//
+// OperatorQuery.h
+//
+// OperatorQuery: (abstract class) a query that combines result lists
+//                returned by other queries kept in an operand list.
+//                how they are combined is tbd by the concrete classes.
+//
+// Part of the ht://Dig package   <http://www.htdig.org/>
+// Copyright (c) 1995-2004 The ht://Dig Group
+// For copyright details, see the file COPYING in your distribution
+// or the GNU Library General Public License (LGPL) version 2 or later
+// <http://www.gnu.org/copyleft/lgpl.html>
+//
+// $Id: OperatorQuery.h,v 1.4 2004/05/28 13:15:24 lha Exp $
+//
+
+//
+// for details about the basic architectural pattern see the book:
+// Design Patterns, by the infamous GoF
+// Interpreter pattern
+//
+
+#ifdef HAVE_CONFIG_H
+#include "htconfig.h"
+#endif
+
+#include "Query.h"
+#include "List.h"
+
+// abstract
+class OperatorQuery : public Query
+{
+public:
+	virtual ~OperatorQuery()
+	{
+		operands.Destroy();
+	}
+
+	// add an operand to the operation
+	void Add(Query *operand)
+	{
+		operands.Add(operand);
+	}
+
+protected:
+	OperatorQuery() {}
+
+	// get results from operands and combine them ad-hoc
+	virtual ResultList *Evaluate() = 0;
+
+	// keyword name of the operation
+	virtual String OperatorString() const = 0;
+
+	// human-readable unparsed string
+	virtual String GetLogicalWords() const;
+
+	// cache index
+	String GetSignature() const
+		{ return String("Compound:")+GetLogicalWords(); }
+
+	// children query operands
+	List operands;
+};
+
+#endif