826 private static int getRVSize(int size){
827 return size == -1 ? -1 : 2 * size;
828 }
829
830 private static ToolkitImage getResolutionVariant(Image image) {
831 if (image instanceof MultiResolutionToolkitImage) {
832 Image resolutionVariant = ((MultiResolutionToolkitImage) image).
833 getResolutionVariant();
834 if (resolutionVariant instanceof ToolkitImage) {
835 return (ToolkitImage) resolutionVariant;
836 }
837 }
838 return null;
839 }
840
841 protected static boolean imageCached(Object key) {
842 return imgCache.containsKey(key);
843 }
844
845 protected static boolean imageExists(String filename) {
846 checkPermissions(filename);
847 return filename != null && new File(filename).exists();
848 }
849
850 @SuppressWarnings("try")
851 protected static boolean imageExists(URL url) {
852 checkPermissions(url);
853 if (url != null) {
854 try (InputStream is = url.openStream()) {
855 return true;
856 }catch(IOException e){
857 return false;
858 }
859 }
860 return false;
861 }
862
863 private static void checkPermissions(String filename) {
864 SecurityManager security = System.getSecurityManager();
865 if (security != null) {
866 security.checkRead(filename);
867 }
868 }
869
870 private static void checkPermissions(URL url) {
871 SecurityManager sm = System.getSecurityManager();
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826 private static int getRVSize(int size){
827 return size == -1 ? -1 : 2 * size;
828 }
829
830 private static ToolkitImage getResolutionVariant(Image image) {
831 if (image instanceof MultiResolutionToolkitImage) {
832 Image resolutionVariant = ((MultiResolutionToolkitImage) image).
833 getResolutionVariant();
834 if (resolutionVariant instanceof ToolkitImage) {
835 return (ToolkitImage) resolutionVariant;
836 }
837 }
838 return null;
839 }
840
841 protected static boolean imageCached(Object key) {
842 return imgCache.containsKey(key);
843 }
844
845 protected static boolean imageExists(String filename) {
846 if (filename == null) {
847 return false;
848 }
849 checkPermissions(filename);
850 return filename != null && new File(filename).exists();
851 }
852
853 @SuppressWarnings("try")
854 protected static boolean imageExists(URL url) {
855 if (url == null) {
856 return false;
857 }
858 checkPermissions(url);
859 if (url != null) {
860 try (InputStream is = url.openStream()) {
861 return true;
862 }catch(IOException e){
863 return false;
864 }
865 }
866 return false;
867 }
868
869 private static void checkPermissions(String filename) {
870 SecurityManager security = System.getSecurityManager();
871 if (security != null) {
872 security.checkRead(filename);
873 }
874 }
875
876 private static void checkPermissions(URL url) {
877 SecurityManager sm = System.getSecurityManager();
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