Make SGPath cache stat() information, cheers Fred

* cache exists/isDir/isFile in SGPath, to avoid
  repeated calls.

simgear/bucket/newbucket.cxx

@@ -139,7 +139,7 @@ void SGBucket::set_bucket(const SGGeod& geod)
 }
 
 // Build the path name for this bucket
-string SGBucket::gen_base_path() const {
+std::string SGBucket::gen_base_path() const {
     // long int index;
     int top_lon, top_lat, main_lon, main_lat;
     char hem, pole;

simgear/ephemeris/stardata.cxx

@@ -34,6 +34,8 @@
   using std::getline;
 #endif
 
+using std::string;
+
 // Constructor
 SGStarData::SGStarData( const SGPath& path )
 {

simgear/misc/sg_dir.cxx

@@ -29,8 +29,6 @@
 #  include <dirent.h>
 #endif
 
-#include <sys/stat.h>
-
 #include <simgear/debug/logstream.hxx>
 
 #include <cstring>
@@ -119,12 +117,12 @@ PathList Dir::children(int types, const std::string& nameFilter) const
       continue;
     }
     
-    struct stat s;
-    if (stat(file(entry->d_name).c_str(), &s)) {
+    SGPath f = file(entry->d_name);
+    if (!f.exists()) {
       continue; // stat() failed
     }
     
-    if (S_ISDIR(s.st_mode)) {
+    if (f.isDir()) {
       // directory handling
       if (!(types & TYPE_DIR)) {
         continue;
@@ -135,7 +133,7 @@ PathList Dir::children(int types, const std::string& nameFilter) const
           continue;
         }
       }
-    } else if (S_ISREG(s.st_mode)) {
+    } else if (f.isFile()) {
       // regular file handling
       if (!(types & TYPE_FILE)) {
         continue;
@@ -162,23 +160,7 @@ PathList Dir::children(int types, const std::string& nameFilter) const
 
 bool Dir::exists() const
 {
-#ifdef _WIN32
-  struct _stat buf ;
-
-  if (_stat (_path.c_str(), &buf ) < 0) {
-    return false;
-  }
-  
-  return ((S_IFDIR & buf.st_mode ) !=0);
-#else
-  struct stat buf ;
-
-  if (stat(_path.c_str(), &buf ) < 0) {
-    return false ;
-  }
-  
-  return ((S_ISDIR(buf.st_mode )) != 0);
-#endif
+  return _path.isDir();
 }
 
 SGPath Dir::file(const std::string& name) const

simgear/misc/sg_path.cxx

@@ -33,6 +33,8 @@
 #endif
 #include "sg_path.hxx"
 
+using std::string;
+
 
 /**
  * define directory path separators
@@ -70,18 +72,38 @@ SGPath::fix()
 
 // default constructor
 SGPath::SGPath()
-    : path("")
+    : path(""),
+    _cached(false)
 {
 }
 
 
 // create a path based on "path"
 SGPath::SGPath( const std::string& p )
-    : path(p)
+    : path(p),
+    _cached(false)
 {
     fix();
 }
 
+SGPath::SGPath(const SGPath& p) :
+  path(p.path),
+  _cached(p._cached),
+  _exists(p._exists),
+  _isDir(p._isDir),
+  _isFile(p._isFile)
+{
+}
+    
+SGPath& SGPath::operator=(const SGPath& p)
+{
+  path = p.path;
+  _cached = p._cached;
+  _exists = p._exists;
+  _isDir = p._isDir;
+  _isFile = p._isFile;
+  return *this;
+}
 
 // destructor
 SGPath::~SGPath() {
@@ -92,6 +114,7 @@ SGPath::~SGPath() {
 void SGPath::set( const string& p ) {
     path = p;
     fix();
+    _cached = false;
 }
 
 
@@ -106,6 +129,7 @@ void SGPath::append( const string& p ) {
 	path += p;
     }
     fix();
+    _cached = false;
 }
 
 //add a new path component to the existing path string
@@ -123,6 +147,7 @@ void SGPath::concat( const string& p ) {
 	path += p;
     }
     fix();
+    _cached = false;
 }
 
 
@@ -169,25 +194,54 @@ string SGPath::extension() const {
     }
 }
 
-bool SGPath::exists() const
+void SGPath::validate() const
 {
-#ifdef _WIN32
-  struct _stat buf;
-
-  if (_stat(path.c_str(), &buf) < 0) {
-    return false;
+  if (_cached) {
+    return;
   }
   
-  return true;
+#ifdef _WIN32
+  struct _stat buf ;
+
+  if (_stat (path.c_str(), &buf ) < 0) {
+    _exists = false;
+  } else {
+    _exists = true;
+    _isFile = ((S_IFREG & buf.st_mode ) !=0)
+    _isDir = ((S_IFDIR & buf.st_mode ) !=0)
+  }
+
 #else
   struct stat buf ;
 
-  if (stat(path.c_str(), &buf) < 0) {
-    return false ;
+  if (stat(path.c_str(), &buf ) < 0) {
+    _exists = false;
+  } else {
+    _exists = true;
+    _isFile = ((S_ISREG(buf.st_mode )) != 0);
+    _isDir = ((S_ISDIR(buf.st_mode )) != 0);
   }
   
-  return true;
 #endif
+  _cached = true;
+}
+
+bool SGPath::exists() const
+{
+  validate();
+  return _exists;
+}
+
+bool SGPath::isDir() const
+{
+  validate();
+  return _exists && _isDir;
+}
+
+bool SGPath::isFile() const
+{
+  validate();
+  return _exists && _isFile;
 }
 
 #ifdef _WIN32

simgear/misc/sg_path.hxx

@@ -35,8 +35,6 @@
 
 #include <simgear/math/sg_types.hxx>
 
-using std::string;
-
 #ifdef _MSC_VER
   typedef int mode_t;
 #endif
@@ -53,18 +51,22 @@ class SGPath {
 
 private:
 
-    string path;
+    std::string path;
 
 public:
 
     /** Default constructor */
     SGPath();
 
+    SGPath(const SGPath& p);
+    
+    SGPath& operator=(const SGPath& p);
+
     /**
      * Construct a path based on the starting path provided.
      * @param p initial path
      */
-    SGPath( const string& p );
+    SGPath( const std::string& p );
 
     /** Destructor */
     ~SGPath();
@@ -73,57 +75,57 @@ public:
      * Set path to a new value
      * @param p new path
      */
-    void set( const string& p );
+    void set( const std::string& p );
     SGPath& operator= ( const char* p ) { this->set(p); return *this; }
 
     /**
      * Append another piece to the existing path.  Inserts a path
      * separator between the existing component and the new component.
      * @param p additional path component */
-    void append( const string& p );
+    void append( const std::string& p );
 
     /**
      * Append a new piece to the existing path.  Inserts a search path
      * separator to the existing path and the new patch component.
      * @param p additional path component */
-    void add( const string& p );
+    void add( const std::string& p );
 
     /**
      * Concatenate a string to the end of the path without inserting a
      * path separator.
      * @param p additional path suffix
      */
-    void concat( const string& p );
+    void concat( const std::string& p );
 
     /**
      * Get the file part of the path (everything after the last path sep)
      * @return file string
      */
-    string file() const;
+    std::string file() const;
   
     /**
      * Get the directory part of the path.
      * @return directory string
      */
-    string dir() const;
+    std::string dir() const;
   
     /**
      * Get the base part of the path (everything but the extension.)
      * @return the base string
      */
-    string base() const;
+    std::string base() const;
 
     /**
      * Get the extension part of the path (everything after the final ".")
      * @return the extension string
      */
-    string extension() const;
+    std::string extension() const;
 
     /**
      * Get the path string
      * @return path string
      */
-    string str() const { return path; }
+    std::string str() const { return path; }
 
     /**
      * Get the path string
@@ -143,22 +145,30 @@ public:
      */
     int create_dir(mode_t mode);
 
+    bool isFile() const;
+    bool isDir() const;
 private:
 
     void fix();
 
+    void validate() const;
+
+    mutable bool _cached;
+    mutable bool _exists;
+    mutable bool _isDir;
+    mutable bool _isFile;
 };
 
 
 /**
  * Split a directory string into a list of it's parent directories.
  */
-string_list sgPathBranchSplit( const string &path );
+string_list sgPathBranchSplit( const std::string &path );
 
 /**
  * Split a directory search path into a vector of individual paths
  */
-string_list sgPathSplit( const string &search_path );
+string_list sgPathSplit( const std::string &search_path );
 
 
 #endif // _SG_PATH_HXX

simgear/scene/material/matmodel.cxx

@@ -28,7 +28,7 @@
 #include <simgear/compiler.h>
 
 #include <map>
-using std::map;
+
 
 #include <osg/AlphaFunc>
 #include <osg/Group>
@@ -46,8 +46,8 @@ using std::map;
 #include "matmodel.hxx"
 
 using namespace simgear;
-
-
+using std::string;
+using std::map;
 ////////////////////////////////////////////////////////////////////////
 // Implementation of SGMatModel.
 ////////////////////////////////////////////////////////////////////////

simgear/scene/model/SGText.cxx

@@ -30,6 +30,8 @@
 #include <osgText/Text>
 #include <osgText/Font>
 
+using std::string;
+
 class SGText::UpdateCallback : public osg::NodeCallback {
 public:
   UpdateCallback( osgText::Text * aText, SGConstPropertyNode_ptr aProperty, double aScale, double aOffset, double aTruncate, double aNumeric, const char * aFormat ) :

simgear/scene/model/modellib.cxx

@@ -39,7 +39,7 @@
 
 #include <simgear/math/SGMath.hxx>
 
-
+using std::string;
 using namespace simgear;
 
 osgDB::RegisterReaderWriterProxy<SGReaderWriterXML> g_readerWriter_XML_Proxy;

simgear/scene/tgdb/TileEntry.hxx

@@ -150,7 +150,7 @@ public:
 
 class ModelLoadHelper {
 public:
-    virtual osg::Node *loadTileModel(const string& modelPath, bool cacheModel)=0;
+    virtual osg::Node *loadTileModel(const std::string& modelPath, bool cacheModel)=0;
 
 };
 

simgear/timing/sg_time.cxx

@@ -59,6 +59,7 @@
 #define DEGHR(x)        ((x)/15.)
 #define RADHR(x)        DEGHR(x*SGD_RADIANS_TO_DEGREES)
 
+using std::string;
 
 static const double MJD0    = 2415020.0;
 static const double J2000   = 2451545.0 - MJD0;