X-Git-Url: http://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=tim%2Fprune%2Fjpeg%2FExifGateway.java;fp=tim%2Fprune%2Fjpeg%2FExifGateway.java;h=5420ea6762fe9d0c534e2a7aa72a8f7dc4c43561;hp=0000000000000000000000000000000000000000;hb=c0387c124840c9407e040600fda88f3c3e8f6aa6;hpb=1ee49ae3c8ef3aa2e63eadd458531e5f8bd4f92c

diff --git a/tim/prune/jpeg/ExifGateway.java b/tim/prune/jpeg/ExifGateway.java
new file mode 100644
index 0000000..5420ea6
--- /dev/null
+++ b/tim/prune/jpeg/ExifGateway.java
@@ -0,0 +1,80 @@
+package tim.prune.jpeg;
+
+import java.io.File;
+
+import javax.swing.JOptionPane;
+
+import tim.prune.I18nManager;
+
+/**
+ * Skeleton gateway to the Exif functions.
+ * This is required by Debian to divert Exif handling
+ * to the external libmetadata-extractor-java library
+ * instead of the included modified routines.
+ *
+ * To use the internal routines, set the USE_INTERNAL_LIBRARY flag to true
+ * and include the internal classes in the compiled jar.
+ * To use the external library, set the USE_INTERNAL_LIBRARY flag to false
+ * and do not export the internal classes.
+ */
+public abstract class ExifGateway
+{
+	// *********************************************************
+	// TODO: Check this exif library flag before releasing!
+	/** Flag to specify internal or external library */
+	private static final boolean USE_INTERNAL_LIBRARY = true;
+	// *********************************************************
+
+	/** Library object to call */
+	private static ExifLibrary _exifLibrary = null;
+	/** Flag to set whether failure warning has already been shown */
+	private static boolean _exifFailWarned = false;
+
+	/** Static block to initialise library */
+	static
+	{
+		String libraryClass = USE_INTERNAL_LIBRARY?"InternalExifLibrary":"ExternalExifLibrary";
+		try
+		{
+			_exifLibrary = (ExifLibrary) Class.forName("tim.prune.jpeg." + libraryClass).newInstance();
+		}
+		catch (Throwable nolib) {_exifLibrary = null;}
+	}
+
+
+	/**
+	 * Get the Jpeg data from the given file
+	 * @param inFile file to read
+	 * @return jpeg data, or null if none found
+	 */
+	public static JpegData getJpegData(File inFile)
+	{
+		try
+		{
+			// Call library (if found)
+			if (_exifLibrary != null) {
+				JpegData data = _exifLibrary.getJpegData(inFile);
+				return data;
+			}
+		}
+		catch (LinkageError nolib) {}
+		// Not successful - warn if necessary
+		if (!_exifFailWarned)
+		{
+			JOptionPane.showMessageDialog(null, I18nManager.getText("error.jpegload.exifreadfailed"),
+				I18nManager.getText("error.jpegload.dialogtitle"), JOptionPane.WARNING_MESSAGE);
+			_exifFailWarned = true;
+		}
+		return null;
+	}
+
+	/**
+	 * @return key to use to describe library, matching key for about dialog
+	 */
+	public static String getDescriptionKey()
+	{
+		String key = USE_INTERNAL_LIBRARY?"internal":"external";
+		if (_exifLibrary == null || !_exifLibrary.looksOK()) {key = key + ".failed";}
+		return key;
+	}
+}