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76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
// Copyright 2008, Google Inc. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// 3. Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This file contains the definition of the Qid class used to manage the
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// Region hierarchy walked in the Regionator class. This is an internal class.
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#ifndef KML_REGIONATOR_REGIONATOR_QID_H__
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#define KML_REGIONATOR_REGIONATOR_QID_H__
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#include <sstream>
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#include "kml/base/util.h"
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namespace kmlregionator {
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enum quadrant_t {
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NW,
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NE,
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SW,
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SE
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};
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const char* const kRootName = "q0";
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// A Qid is simply a number to identify a Region. There are methods on a Qid
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// to create Qid's for the four children of a Region.
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class Qid {
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public:
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Qid() {}
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Qid(const string& qid) : qid_(qid) {}
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static Qid CreateRoot() {
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return Qid(kRootName);
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}
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Qid CreateChild(quadrant_t quadrant) const {
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std::stringstream ss;
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ss << quadrant;
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return Qid(qid_ + ss.str());
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}
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size_t depth() const {
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return qid_.size() - 1;
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}
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const string& str() const {
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return qid_;
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}
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bool IsRoot() {
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return qid_ == kRootName;
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}
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private:
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string qid_;
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};
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} // end namespace kmlregionator
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#endif // KML_REGIONATOR_REGIONATOR_QID_H__
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