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/*
* Copyright (C) 2012 United States Government as represented by the Administrator of the
* National Aeronautics and Space Administration.
* All Rights Reserved.
*/
package gov.nasa.worldwind.data;
import gov.nasa.worldwind.*;
import gov.nasa.worldwind.avlist.*;
import gov.nasa.worldwind.cache.*;
import gov.nasa.worldwind.exception.WWRuntimeException;
import gov.nasa.worldwind.formats.dds.DDSCompressor;
import gov.nasa.worldwind.geom.Sector;
import gov.nasa.worldwind.util.*;
import org.w3c.dom.*;
import javax.xml.xpath.*;
import java.awt.*;
import java.io.File;
import java.nio.ByteBuffer;
/**
* @author Lado Garakanidze
* @version $Id: BasicRasterServer.java 1171 2013-02-11 21:45:02Z dcollins $
*/
/**
* BasicRasterServer maintains a list of data sources and their properties in the BasicRasterServerCache and is used to
* compose (mosaic) a data raster of the given region of interest from data sources.
*/
public class BasicRasterServer extends WWObjectImpl implements RasterServer
{
protected final String XPATH_RASTER_SERVER = "/RasterServer";
protected final String XPATH_RASTER_SERVER_PROPERTY = XPATH_RASTER_SERVER + "/Property";
protected final String XPATH_RASTER_SERVER_SOURCE = XPATH_RASTER_SERVER + "/Sources/Source";
protected final String XPATH_RASTER_SERVER_SOURCE_SECTOR = XPATH_RASTER_SERVER_SOURCE + "/Sector";
protected java.util.List dataRasterList = new java.util.ArrayList();
protected DataRasterReaderFactory readerFactory;
protected static final MemoryCache cache = new BasicRasterServerCache();
/**
* BasicRasterServer constructor reads a list of data raster sources from *.RasterServer.xml (the file that
* accompanies layer description XML file), reads sector of each source and maintains a list of data sources, their
* properties,
*
* @param o the RasterServer.xml source to read. May by a {@link java.io.File}, a file path, a URL or an
* {@link org.w3c.dom.Element}
* @param params optional metadata associated with the data source that might be useful to the BasicRasterServer.
*/
public BasicRasterServer(Object o, AVList params)
{
super();
if (null != params)
{
this.setValues(params);
}
try
{
this.readerFactory = (DataRasterReaderFactory) WorldWind.createConfigurationComponent(
AVKey.DATA_RASTER_READER_FACTORY_CLASS_NAME);
}
catch (Exception e)
{
this.readerFactory = new BasicDataRasterReaderFactory();
}
this.init(o);
}
/** Returns an instance of the MemoryCache that contains DataRasters and their properties
*
* @return an instance of the MemoryCache that contains DataRasters and their properties
*/
public MemoryCache getCache()
{
return cache;
}
/**
* Returns TRUE, if the DataRaster list is not empty
*
* @return true, if the DataRaster list is not empty
*/
public boolean hasDataRasters()
{
return (this.dataRasterList.size() > 0);
}
protected void init(Object o)
{
if (null == o)
{
String message = Logging.getMessage("nullValue.ObjectIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
Element rootElement = null;
if (o instanceof Element)
{
rootElement = (Element) o;
}
else if (o instanceof Document)
{
rootElement = ((Document) o).getDocumentElement();
}
else
{
Document doc = WWXML.openDocument(o);
if (null != doc)
{
rootElement = doc.getDocumentElement();
}
}
if (null == rootElement)
{
String message = Logging.getMessage("generic.UnexpectedObjectType", o.getClass().getName());
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
String rootElementName = rootElement.getNodeName();
if (!"RasterServer".equals(rootElementName))
{
String message = Logging.getMessage("generic.InvalidDataSource", rootElementName);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
XPath xpath = WWXML.makeXPath();
this.extractProperties(rootElement, xpath);
if( this.readRasterSources(rootElement, xpath) )
{
// success, all raster sources are available
String message = Logging.getMessage("generic.DataSetAvailable", this.getDataSetName() );
Logging.logger().finest(message);
}
else
{
// some (or all) required source rasters are not available (either missing or unreadable)
// and therefore the dataset may not generate high resolution on-the-fly
String message = Logging.getMessage("generic.DataSetLimitedAvailability", this.getDataSetName() );
Logging.logger().severe(message);
}
}
protected String getDataSetName()
{
return AVListImpl.getStringValue( this, AVKey.DATASET_NAME, "" );
}
/**
* Returns DataSet's pixel format (AVKey.IMAGE or AVKey.ELEVATION), or empty string if not set
*
* @return DataSet's pixel format (AVKey.IMAGE or AVKey.ELEVATION), or empty string if not set
*/
protected String getDataSetPixelFormat()
{
return AVListImpl.getStringValue( this, AVKey.PIXEL_FORMAT, "" );
}
protected void setDataSetPixelFormat(String pixelFormat)
{
this.setValue(AVKey.PIXEL_FORMAT, pixelFormat);
}
/**
* Extracts all key and values from the given DOM element
*
* @param domElement XML object as DOM
* @param xpath XPath instance
*/
protected void extractProperties(Element domElement, XPath xpath)
{
Element[] props = WWXML.getElements(domElement, XPATH_RASTER_SERVER_PROPERTY, xpath);
if (props != null && props.length > 0)
{
for (Element prop : props)
{
String key = prop.getAttribute("name");
String value = prop.getAttribute("value");
if (!WWUtil.isEmpty(key) && !WWUtil.isEmpty(value))
{
if (!this.hasKey(key))
{
this.setValue(key, value);
}
else
{
Object oldValue = this.getValue(key);
if (value.equals(oldValue))
{
continue;
}
String msg = Logging.getMessage("generic.AttemptToChangeExistingProperty", key, oldValue,
value);
Logging.logger().fine(msg);
}
}
}
}
}
/**
* Reads XML document and extracts raster sources
*
* @param domElement DOM element
*
* @param xpath XPath instance
*
* @return TRUE, if all raster sources are available, FALSE otherwise
*
*/
protected boolean readRasterSources(Element domElement, XPath xpath)
{
long startTime = System.currentTimeMillis();
boolean hasUnavailableRasterSources = false;
int numSources = 0;
Sector extent = null;
try
{
XPathExpression xpExpression = xpath.compile(XPATH_RASTER_SERVER_SOURCE);
NodeList nodes = (NodeList) xpExpression.evaluate(domElement, XPathConstants.NODESET);
if (nodes == null || nodes.getLength() == 0)
{
return false;
}
numSources = nodes.getLength();
for (int i = 0; i < numSources; i++)
{
Thread.yield();
try
{
Node node = nodes.item(i);
node.getParentNode().removeChild(node);
if (node.getNodeType() != Node.ELEMENT_NODE)
{
continue;
}
Element source = (Element) node;
String rasterSourcePath = source.getAttribute("path");
if (WWUtil.isEmpty(rasterSourcePath))
{
continue;
}
AVList rasterMetadata = new AVListImpl();
File rasterSourceFile = new File(rasterSourcePath);
// normalize
rasterSourcePath = rasterSourceFile.getAbsolutePath();
if( !rasterSourceFile.exists() )
{
hasUnavailableRasterSources = true;
String reason = Logging.getMessage("generic.FileDoesNotExists", rasterSourcePath );
Logging.logger().warning(reason);
continue;
}
if( !rasterSourceFile.canRead() )
{
hasUnavailableRasterSources = true;
String reason = Logging.getMessage("generic.FileNoReadPermission", rasterSourcePath );
Logging.logger().warning(reason);
continue;
}
DataRasterReader rasterReader = this.findDataRasterReader(rasterSourceFile, rasterMetadata);
if (null == rasterReader)
{
hasUnavailableRasterSources = true;
String reason = Logging.getMessage("generic.UnknownFileFormatOrMatchingReaderNotFound",
rasterSourcePath );
Logging.logger().warning(reason);
continue;
}
Sector sector = WWXML.getSector(source, "Sector", xpath);
if (null == sector)
{
rasterReader.readMetadata(rasterSourceFile, rasterMetadata);
Object o = rasterMetadata.getValue(AVKey.SECTOR);
sector = (o instanceof Sector) ? (Sector) o : sector;
}
else
{
rasterMetadata.setValue(AVKey.SECTOR, sector);
}
Object rasterPixelFormat = rasterMetadata.getValue(AVKey.PIXEL_FORMAT);
String datasetPixelFormat = this.getDataSetPixelFormat();
if( !WWUtil.isEmpty(datasetPixelFormat) )
{
// verify all data rasters are the same type - we do not allow to mix elevations and imagery
if (!datasetPixelFormat.equals(rasterPixelFormat))
{
hasUnavailableRasterSources = true;
String reason = Logging.getMessage("generic.UnexpectedRasterType", rasterSourcePath );
Logging.logger().warning(reason);
continue;
}
}
else
{
if( AVKey.IMAGE.equals(rasterPixelFormat) || AVKey.ELEVATION.equals(rasterPixelFormat) )
{
this.setDataSetPixelFormat( (String)rasterPixelFormat );
}
else
{
hasUnavailableRasterSources = true;
String reason = Logging.getMessage("generic.UnknownFileFormat", rasterSourcePath );
Logging.logger().warning(reason);
continue;
}
}
if (null != sector)
{
extent = Sector.union(extent, sector);
this.dataRasterList.add(
new CachedDataRaster(rasterSourceFile, rasterMetadata, rasterReader, this.getCache())
);
}
else
{
hasUnavailableRasterSources = true;
String reason = Logging.getMessage("generic.NoSectorSpecified", rasterSourcePath );
Logging.logger().warning(reason);
continue;
}
}
catch (Throwable t)
{
String message = t.getMessage();
message = (WWUtil.isEmpty(message)) ? t.getCause().getMessage() : message;
Logging.logger().log(java.util.logging.Level.WARNING, message, t);
}
}
if (null != extent && extent.getDeltaLatDegrees() > 0d && extent.getDeltaLonDegrees() > 0d)
{
this.setValue(AVKey.SECTOR, extent);
}
}
catch (Throwable t)
{
String message = t.getMessage();
message = (WWUtil.isEmpty(message)) ? t.getCause().getMessage() : message;
Logging.logger().log(java.util.logging.Level.SEVERE, message, t);
}
finally
{
Logging.logger().finest(this.getStringValue(AVKey.DISPLAY_NAME) + ": " + numSources
+ " files in " + (System.currentTimeMillis() - startTime) + " milli-seconds");
}
return !hasUnavailableRasterSources;
}
protected DataRasterReader findDataRasterReader(Object source, AVList params)
{
if (source == null)
{
String message = Logging.getMessage("nullValue.SourceIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
params = (null == params) ? new AVListImpl() : params;
DataRasterReader reader = this.readerFactory.findReaderFor(source, params);
if (reader == null)
{
return null;
}
if (!params.hasKey(AVKey.PIXEL_FORMAT))
{
try
{
reader.readMetadata(source, params);
}
catch (Exception e)
{
// Reading the input source's metadata caused an exception. This exception does not prevent us from
// determining if the source represents elevation data, but we want to make a note of it. Therefore we
// log the exception with level FINE.
String message = Logging.getMessage("generic.ExceptionWhileReading", source);
Logging.logger().finest(message);
}
}
return reader;
}
public Sector getSector()
{
return (this.hasKey(AVKey.SECTOR)) ? (Sector) this.getValue(AVKey.SECTOR) : null;
}
/**
* Composes a DataRaster of the given width and height for the specific geographic region of interest (ROI).
*
* @param reqParams This is a required parameter, must not be null or empty; Must contain AVKey.WIDTH, AVKey.HEIGHT,
* and AVKey.SECTOR values.
*
* Optional keys are: AVKey.PIXEL_FORMAT (AVKey.ELEVATION | AVKey.IMAGE) AVKey.DATA_TYPE
* AVKey.BYTE_ORDER (AVKey.BIG_ENDIAN | AVKey.LITTLE_ENDIAN )
*
* @return a DataRaster for the requested ROI
*
* @throws gov.nasa.worldwind.exception.WWRuntimeException
* if there is no intersection of the source rasters with the requested ROI or the
* source format is unknown or not supported by currently loaded drivers
* @throws IllegalArgumentException if any of the required parameters or values are missing
*/
public DataRaster composeRaster(AVList reqParams) throws IllegalArgumentException, WWRuntimeException
{
DataRaster reqRaster;
if (null == reqParams)
{
String message = Logging.getMessage("nullValue.ParamsIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (!reqParams.hasKey(AVKey.WIDTH))
{
String message = Logging.getMessage("generic.MissingRequiredParameter", AVKey.WIDTH);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (!reqParams.hasKey(AVKey.HEIGHT))
{
String message = Logging.getMessage("generic.MissingRequiredParameter", AVKey.HEIGHT);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
Object o = reqParams.getValue(AVKey.SECTOR);
if (null == o || !(o instanceof Sector))
{
String message = Logging.getMessage("generic.MissingRequiredParameter", AVKey.SECTOR);
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
Sector reqSector = (Sector) o;
Sector rasterExtent = this.getSector();
if (!reqSector.intersects(rasterExtent))
{
String message = Logging.getMessage("generic.SectorRequestedOutsideCoverageArea", reqSector, rasterExtent);
Logging.logger().finest(message);
throw new WWRuntimeException(message);
}
try
{
int reqWidth = (Integer) reqParams.getValue(AVKey.WIDTH);
int reqHeight = (Integer) reqParams.getValue(AVKey.HEIGHT);
if (!reqParams.hasKey(AVKey.BYTE_ORDER))
{
reqParams.setValue(AVKey.BYTE_ORDER, AVKey.BIG_ENDIAN);
}
// check if this Raster Server serves elevations or imagery
if (AVKey.ELEVATION.equals(this.getStringValue(AVKey.PIXEL_FORMAT)))
{
reqParams.setValue(AVKey.PIXEL_FORMAT, AVKey.ELEVATION);
if (!reqParams.hasKey(AVKey.DATA_TYPE))
{
reqParams.setValue(AVKey.DATA_TYPE, AVKey.INT16);
}
reqRaster = new ByteBufferRaster(reqWidth, reqHeight, reqSector, reqParams);
}
else if (AVKey.IMAGE.equals(this.getStringValue(AVKey.PIXEL_FORMAT)))
{
reqParams.setValue(AVKey.PIXEL_FORMAT, AVKey.IMAGE);
reqRaster = new BufferedImageRaster(reqWidth, reqHeight, Transparency.TRANSLUCENT, reqSector);
}
else
{
String msg = Logging.getMessage("generic.UnrecognizedSourceType", this.getValue(AVKey.PIXEL_FORMAT));
Logging.logger().severe(msg);
throw new WWRuntimeException(msg);
}
int numIntersectedRasters = 0;
for (DataRaster raster : this.dataRasterList)
{
Sector rasterSector = raster.getSector();
Sector overlap = reqSector.intersection(rasterSector);
// SKIP, if not intersection, or intersects only on edges
if (null == overlap || overlap.getDeltaLatDegrees() == 0d || overlap.getDeltaLonDegrees() == 0d)
{
continue;
}
raster.drawOnTo(reqRaster);
numIntersectedRasters++;
}
if (numIntersectedRasters == 0)
{
String message = Logging.getMessage("generic.SectorRequestedOutsideCoverageArea", reqSector, "");
Logging.logger().finest(message);
throw new WWRuntimeException(message);
}
}
catch (WWRuntimeException wwe)
{
throw wwe;
}
catch (Throwable t)
{
String message = t.getMessage();
message = (WWUtil.isEmpty(message)) ? t.getCause().getMessage() : message;
Logging.logger().log(java.util.logging.Level.FINE, message, t);
throw new WWRuntimeException(message);
}
return reqRaster;
}
/**
* Composes a DataRaster of the given width and height for the specific geographic region of interest (ROI), in the
* requested file format (AVKey.IMAGE_FORMAT) and returns as a ByteBuffer
*
* @param params This is a required parameter, must not be null or empty; Must contain AVKey.WIDTH, AVKey.HEIGHT,
* AVKey.SECTOR, and AVKey.IMAGE_FORMAT (mime type) values. Supported mime types are: "image/png",
* "image/jpeg", "image/dds".
*
* Optional keys are: AVKey.PIXEL_FORMAT (AVKey.ELEVATION | AVKey.IMAGE) AVKey.DATA_TYPE
* AVKey.BYTE_ORDER (AVKey.BIG_ENDIAN | AVKey.LITTLE_ENDIAN )
*
* @return a DataRaster for the requested ROI
*
* @throws gov.nasa.worldwind.exception.WWRuntimeException
* if there is no intersection of the source rasters with the requested ROI or the
* source format is unknown or not supported by currently loaded drivers
* @throws IllegalArgumentException if any of the required parameters or values are missing
*/
public ByteBuffer getRasterAsByteBuffer(AVList params)
{
// request may contain a specific file format, different from a default file format
String format = (null != params && params.hasKey(AVKey.IMAGE_FORMAT))
? params.getStringValue(AVKey.IMAGE_FORMAT) : this.getStringValue(AVKey.IMAGE_FORMAT);
if (WWUtil.isEmpty(format))
{
String message = Logging.getMessage("generic.MissingRequiredParameter", AVKey.IMAGE_FORMAT);
Logging.logger().severe(message);
throw new WWRuntimeException(message);
}
if (this.dataRasterList.isEmpty())
{
String message = Logging.getMessage("generic.NoImagesAvailable");
Logging.logger().finest(message);
throw new WWRuntimeException(message);
}
try
{
DataRaster raster = this.composeRaster(params);
if (raster instanceof BufferedImageRaster)
{
if ("image/png".equalsIgnoreCase(format))
{
return ImageUtil.asPNG(raster);
}
else if ("image/jpeg".equalsIgnoreCase(format) || "image/jpg".equalsIgnoreCase(format))
{
return ImageUtil.asJPEG(raster);
}
if ("image/dds".equalsIgnoreCase(format))
{
return DDSCompressor.compressImage(((BufferedImageRaster) raster).getBufferedImage());
}
else
{
String msg = Logging.getMessage("generic.UnknownFileFormat", format);
Logging.logger().severe(msg);
throw new WWRuntimeException(msg);
}
}
else if (raster instanceof ByteBufferRaster)
{
// Elevations as BIL16 or as BIL32 are stored in the simple ByteBuffer object
return ((ByteBufferRaster) raster).getByteBuffer();
}
else
{
String msg = Logging.getMessage("generic.UnexpectedRasterType", raster.getClass().getName());
Logging.logger().severe(msg);
throw new WWRuntimeException(msg);
}
}
catch (WWRuntimeException wwe)
{
Logging.logger().finest(wwe.getMessage());
}
catch (Throwable t)
{
String message = t.getMessage();
message = (WWUtil.isEmpty(message)) ? t.getCause().getMessage() : message;
Logging.logger().log(java.util.logging.Level.SEVERE, message, t);
}
return null;
}
}
