// **********************************************************************
//
// <copyright>
//
// BBN Technologies
// 10 Moulton Street
// Cambridge, MA 02138
// (617) 873-8000
//
// Copyright (C) BBNT Solutions LLC. All rights reserved.
//
// </copyright>
// **********************************************************************
//
// $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/dataAccess/asrp/ASRPDirectoryHandler.java,v $
// $RCSfile: ASRPDirectoryHandler.java,v $
// $Revision: 1.1.2.2 $
// $Date: 2004/10/14 18:26:39 $
// $Author: dietrick $
//
// **********************************************************************
package com.bbn.openmap.dataAccess.asrp;
import com.bbn.openmap.omGraphics.DrawingAttributes;
import com.bbn.openmap.omGraphics.OMGraphicList;
import com.bbn.openmap.omGraphics.OMRect;
import com.bbn.openmap.proj.EqualArc;
import com.bbn.openmap.proj.Projection;
import com.bbn.openmap.util.DataBounds;
import com.bbn.openmap.util.Debug;
import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
/**
* The ASRPDirectoryHandler is the main object a layer would use when
* trying to deal with a bunch of ASRP image directories and/or a THF
* file that refers to many ASRP image directories. This object will
* make decisions, based on the coverage of the imagery of a certain
* ASRP directory image and its "scale" (determined by the number of
* pixels E-W of the projection of the image) what images are suitable
* for a given EqualArc projection.
*/
public class ASRPDirectoryHandler {
protected List asrpDirs;
public ASRPDirectoryHandler() {}
public OMGraphicList getCoverageBounds(Projection proj, DrawingAttributes da) {
OMGraphicList list = new OMGraphicList();
List asrps = getASRPDirs();
for (Iterator it = asrps.iterator(); it.hasNext();) {
OMRect rect = ((ASRPDirectory) it.next()).getBounds();
da.setTo(rect);
rect.generate(proj);
list.add(rect);
}
return list;
}
public OMGraphicList getImagesForProjection(EqualArc proj)
throws IOException {
OMGraphicList ret = new OMGraphicList();
if (proj == null) {
return null;
}
List asrps = getASRPDirs();
List currentBestASRPs = new LinkedList();
double bestScaleDiff = Double.MAX_VALUE;
Iterator it;
ASRPDirectory current;
for (it = asrps.iterator(); it.hasNext();) {
try {
current = (ASRPDirectory) it.next();
} catch (ClassCastException cce) {
Debug.message("asrp",
"ASRPDirectoryHandler.getImagesForProjection: ASRP directory list contains something other than ASRPDirectory objects");
continue;
}
if (current.isOnMap(proj) && current.validScale(proj)) {
// Need to check to see if the ASRP Directory is the
// best fit for the current projection scale, since
// it's on the map and within the scale limits.
double scaleDiff = Math.abs(proj.getXPixConstant()
- current.arv);
if (scaleDiff < bestScaleDiff) {
if (Debug.debugging("asrp")) {
Debug.output("ASRPDirHandler: SETTING new diff ("
+ scaleDiff + ") adding ASRPDirectory "
+ current.dir);
}
bestScaleDiff = scaleDiff;
currentBestASRPs.clear();
currentBestASRPs.add(current);
} else if (scaleDiff == bestScaleDiff) {
if (Debug.debugging("asrp")) {
Debug.output("ASRPDirHandler: USING current diff ("
+ scaleDiff + ") adding ASRPDirectory "
+ current.dir);
}
currentBestASRPs.add(current);
}
}
}
// OK, now currentBestASRPs should contain the ASRPDirectories
// that best fit the current projection. If its empty, we
// just return an empty list.
for (it = currentBestASRPs.iterator(); it.hasNext();) {
current = (ASRPDirectory) it.next();
if (Debug.debugging("asrp")) {
Debug.output("ASRPDirHandler: getting images from "
+ current.dir);
}
OMGraphicList subList = current.getTiledImages(proj);
if (subList.size() > 0) {
ret.add(subList);
} else {
if (Debug.debugging("asrp")) {
Debug.output("ASRPDirHandler: no images retrieved ("
+ subList.size() + ")");
}
}
}
if (ret.size() == 0)
ret = null;
return ret;
}
public void add(TransmittalHeaderFile thf) {
if (thf != null) {
getASRPDirs().addAll(thf.getASRPDirectories());
}
}
public void add(ASRPDirectory asrpDir) {
getASRPDirs().add(asrpDir);
}
public void remove(TransmittalHeaderFile thf) {
if (thf != null) {
getASRPDirs().removeAll(thf.getASRPDirectories());
}
}
public void remove(ASRPDirectory asrpDir) {
getASRPDirs().remove(asrpDir);
}
public void clear() {
getASRPDirs().clear();
}
public List getASRPDirs() {
if (asrpDirs == null) {
asrpDirs = new LinkedList();
}
return asrpDirs;
}
public void setASRPDirs(List list) {
asrpDirs = list;
}
/**
* DataBounds interface method, although this object doesn't
* implement the complete interface because it doesn't have a
* name.
*/
public DataBounds getDataBounds() {
DataBounds box = null;
double minx = 180;
double miny = 90;
double maxx = -180;
double maxy = -90;
boolean set = false;
List asrps = getASRPDirs();
for (Iterator it = asrps.iterator(); it.hasNext();) {
OMRect rect = ((ASRPDirectory) it.next()).getBounds();
float n = rect.getNorthLat();
float s = rect.getSouthLat();
float w = rect.getWestLon();
float e = rect.getEastLon();
if (n < miny)
miny = n;
if (n > maxy)
maxy = n;
if (s < miny)
miny = s;
if (s > maxy)
maxy = s;
if (w < minx)
minx = w;
if (w > maxx)
maxx = w;
if (e < minx)
minx = e;
if (e > maxx)
maxx = e;
set = true;
}
if (set) {
box = new DataBounds(minx, miny, maxx, maxy);
if (Debug.debugging("asrp")) {
Debug.output("ASRPDirectoryHandler.getDataBounds(): "
+ box.toString());
}
}
return box;
}
}