/usr/include/kml/engine/kml_cache.h is in libkml-dev 1.3.0-1.
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//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
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// used to endorse or promote products derived from this software without
// specific prior written permission.
//
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef KML_ENGINE_KML_CACHE_H__
#define KML_ENGINE_KML_CACHE_H__
#include "kml/base/net_cache.h"
#include "boost/scoped_ptr.hpp"
#include "kml/engine/kml_file.h"
#include "kml/engine/kmz_cache.h"
namespace kmlengine {
// A cache of KmlFile's (parse of a KML file of a given URL).
typedef kmlbase::NetCache<KmlFile> KmlFileNetCache;
// This class is the main public API for networked KML. Overall usage is as
// follows:
// class YourNetFetcher : public kmlbase::NetFetcher {
// // see kmlbase::NetCache
// };
// YourNetFetcher your_net_fetcher;
// KmlCache kml_cache(&your_net_fetcher, cache_size);
// KmlFilePtr k0 = kml_cache.FetchKmlAbsolute("http://host.com/file.kml");
// KmlFilePtr k1 = kml_cache.FetchKmlAbsolute("http://host.com/file.kmz");
// KmlFilePtr k2 =
// kml_cache.FetchKmlAbsolute("http://host.com/file.kmz/foo.kml");
// KmlFilePtr k3 =
// kml_cache.FetchKmlRelative("http://host.com/file.kmz/doc.kml",
// "link.kml");
// string data;
// bool status = kml_cache.FetchDataRelative("http://host.com/overlay.kml",
// "image.jpg", &data);
// bool status =
// kml_cache.FetchDataRelative("http://host.com/file.kmz/doc.kml"
// "image.jpg", &data);
// As the "cache" name suggests subsequent fetches for a given URL will
// potentially hit the cache.
class KmlCache {
public:
KmlCache(kmlbase::NetFetcher* net_fetcher, size_t max_size);
// Any caller expecting to fetch and parse KML data should use this method.
// Use this with the raw content of a NetworkLink/Link/href, styleUrl, or
// schemaUrl. A given parse of a local or remote StyleSelector or Schema
// referenced by a styleUrl/schemaUrl is thus cached. The returned KmlFile
// is marked with a pointer back to this cache such that other internal
// KML Engine algorithms can fetch (and cache) shared styles and schemas.
// The base_url is typically that of the file containing the target_href.
KmlFilePtr FetchKmlRelative(const string& base_url,
const string& target_href);
// This method is used to fetch a remote KML or KMZ file with an absolute URL.
// If the fetch or parse fails NULL is returned.
KmlFilePtr FetchKmlAbsolute(const string& kml_url);
// Any caller expecting to fetch data which _may_ be within a KMZ should use
// this method. If the data is within a remote KMZ file that KMZ file is
// first fetched and cached such that subsequent access to this or other files
// within that KMZ file are out of the locally cached KMZ file. Such content
// includes Model/Link/href (COLLADA geometry) and images for icons, overlays
// or model textures. The target_href here typically is the content of an
// Overlay Icon's href, or Model's Link href. The base_url is typically that
// of the file containing the target_href.
bool FetchDataRelative(const string& base_url,
const string& target_href,
string* content);
private:
boost::scoped_ptr<KmzCache> kmz_file_cache_;
boost::scoped_ptr<KmlFileNetCache> kml_file_cache_;
};
} // end namespace kmlengine
#endif // KML_ENGINE_KML_CACHE_H__
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