/**
* Before downloading a file for map icons (see "retrieveMapImageForIcon" below), first remove any
* existing .img and .img.* files
*
* <p>e.g. delete all that start with (DataFile name) + ".img"
*
* @param mapLayerMetadata
* @return
* @throws IOException
*/
private boolean deleteOlderMapThumbnails(MapLayerMetadata mapLayerMetadata) {
if (mapLayerMetadata == null) {
logger.warning("mapLayerMetadata is null");
return false;
}
// Retrieve the data file
//
DataFile df = mapLayerMetadata.getDataFile();
try {
DataFileIO dataAccess = df.getAccessObject();
if (dataAccess == null || !dataAccess.isLocalFile()) {
return false;
}
// Get the parent directory
//
Path fileDirname = dataAccess.getFileSystemPath().getParent();
if (fileDirname == null) {
logger.warning(
"DataFile directory has null path. Directory path: "
+ dataAccess.getFileSystemPath().toString());
return false;
}
// Verify that the directory exists
//
File fileDirectory = new File(fileDirname.normalize().toString());
if (!(fileDirectory.isDirectory())) {
logger.warning(
"DataFile directory is not actuall a directory. Directory path: "
+ fileDirectory.toString());
return false;
}
/* Iterate through directory and delete any ".img" files for this DataFile
Example:
Datafile name: 14a5e4abf7d-e7eebfb6474d
Types of files that would be deleted (if they exist):
14a5e4abf7d-e7eebfb6474d.img
14a5e4abf7d-e7eebfb6474d.img.thumb64
14a5e4abf7d-e7eebfb6474d.img.thumb400
*/
String iconBaseFilename = dataAccess.getFileSystemPath().toString() + ".img";
for (File singleFile : fileDirectory.listFiles()) {
if (singleFile.toString().startsWith(iconBaseFilename)) {
// logger.info("file found: " + singleFile.toString());
singleFile.delete();
// results.add(file.getName());
}
}
} catch (IOException ioEx) {
return false;
}
return true;
}
public MapLayerMetadata save(MapLayerMetadata layer_metadata) {
if (layer_metadata == null) {
return null;
}
if (layer_metadata.getId() == null) {
em.persist(layer_metadata);
return layer_metadata;
} else {
return em.merge(layer_metadata);
}
}
/*
Delete a mapLayerMetadata object.
First check if the given user has permission to edit this data.
*/
public boolean deleteMapLayerMetadataObject(MapLayerMetadata mapLayerMetadata, User user) {
logger.info("deleteMapLayerMetadataObject");
if ((mapLayerMetadata == null) || (user == null)) {
return false;
}
if (permissionService
.userOn(user, mapLayerMetadata.getDataFile().getOwner())
.has(Permission.EditDataset)) {
em.remove(em.merge(mapLayerMetadata));
this.deleteOlderMapThumbnails(mapLayerMetadata);
return true;
}
return false;
}
/**
* Use the mapLayerMetadata.mapImageLink to retrieve a PNG file directly from WorldMap
*
* <p>Next step: Save this image as the default icon
*
* <p>Example mapImageLink:
* http://worldmap.harvard.edu/download/wms/14708/png?layers=geonode:power_plants_enipedia_jan_2014_kvg&width=948&bbox=76.04800165,18.31860358,132.0322222,50.78441&service=WMS&format=image/png&srs=EPSG:4326&request=GetMap&height=550
*
* <p>Parameter by parameter (note width/height):
* http://worldmap.harvard.edu/download/wms/14708/png?
* layers=geonode:power_plants_enipedia_jan_2014_kvg width=948
* bbox=76.04800165,18.31860358,132.0322222,50.78441 service=WMS format=image/png srs=EPSG:4326
* request=GetMap height=550
*
* @param mapLayerMetadata
* @return boolean
* @throws IOException
*/
public boolean retrieveMapImageForIcon(MapLayerMetadata mapLayerMetadata) throws IOException {
if (mapLayerMetadata == null) {
logger.warning("mapLayerMetadata is null");
return false;
}
this.deleteOlderMapThumbnails(mapLayerMetadata);
if (true) {
// debug check
// return false;
}
if ((mapLayerMetadata.getMapImageLink() == null)
|| mapLayerMetadata.getMapImageLink().isEmpty()) {
logger.warning("mapLayerMetadata does not have a 'map_image_link' attribute");
return false;
}
String imageUrl = mapLayerMetadata.getMapImageLink();
imageUrl = imageUrl.replace("https:", "http:");
logger.info("Attempt to retrieve map image: " + imageUrl);
DataFileIO dataAccess = null;
try {
dataAccess = mapLayerMetadata.getDataFile().getAccessObject();
} catch (IOException ioEx) {
dataAccess = null;
}
if (dataAccess == null || !dataAccess.isLocalFile()) {
return false;
}
String destinationFile = dataAccess.getFileSystemPath().toString() + ".img";
logger.info(
"destinationFile: getFileSystemLocation()" + dataAccess.getFileSystemPath().toString());
logger.info("destinationFile: " + destinationFile);
URL url = new URL(imageUrl);
logger.info("retrieve url : " + imageUrl);
logger.info("try to open InputStream");
InputStream is = null;
try {
is = url.openStream();
} catch (IOException exio) {
logger.warning("Error when retrieving map icon image. Exception: " + exio.getMessage());
if (is != null) {
try {
is.close();
} catch (IOException ignore) {
}
}
return false;
}
OutputStream os = null;
try {
logger.info("try to start OutputStream");
os = new FileOutputStream(destinationFile);
} catch (Exception ex) {
logger.warning("Error when retrieving map icon image. Exception: " + ex.getMessage());
if (os != null) {
try {
os.close();
} catch (IOException ignore) {
}
}
return false;
}
byte[] b = new byte[2048];
int length;
logger.info("Writing file...");
while ((length = is.read(b)) != -1) {
os.write(b, 0, length);
}
logger.info("Closing streams...");
is.close();
os.close();
logger.info("Done");
return true;
}
