Use SRTM 1deg data from NASA servers

[GpsPrune.git] / src / tim / prune / function / srtm / SrtmDiskCache.java

diff --git a/src/tim/prune/function/srtm/SrtmDiskCache.java b/src/tim/prune/function/srtm/SrtmDiskCache.java
new file mode 100644 (file)
index 0000000..80159e0
--- /dev/null
+++ b/src/tim/prune/function/srtm/SrtmDiskCache.java
@@ -0,0 +1,49 @@
+package tim.prune.function.srtm;
+
+import java.io.File;
+
+import tim.prune.config.Config;
+import tim.prune.I18nManager;
+
+public class SrtmDiskCache {
+
+       private static boolean _cacheIsUsable = false;
+       private static File _cacheDir = null;
+
+       public static boolean ensureCacheIsUsable()
+       {
+
+               if (_cacheIsUsable)
+               {
+                       return true;
+               }
+               // Check the cache is ok
+               String diskCachePath = Config.getConfigString(Config.KEY_DISK_CACHE);
+               if (diskCachePath == null)
+               {
+                       return false;
+               }
+               File srtmDir = new File(diskCachePath, "srtm");
+               if (!srtmDir.exists() && !srtmDir.mkdir()) {
+                       // can't create the srtm directory
+                       return false;
+               }
+               _cacheIsUsable = true;
+               _cacheDir = srtmDir;
+               return true;
+       }
+
+       public static File getCacheDir(String inSourceName)
+       {
+               if (_cacheDir == null)
+               {
+                       ensureCacheIsUsable();
+               }
+               File cacheDir = new File(_cacheDir, inSourceName);
+               if (!cacheDir.exists() && !cacheDir.mkdir()) {
+                       // can't create the srtm directory
+                       return null;
+               }
+               return cacheDir;
+       }
+}