/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
* (c) 2001 - 2013 OpenPlans
* This code is licensed under the GPL 2.0 license, available at the root
* application directory.
*/
package org.vfny.geoserver.wms.responses.map.htmlimagemap;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.Point2D;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.geoserver.wms.GetMapRequest;
import org.geoserver.wms.WMSMapContent;
import org.geotools.data.DataSourceException;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.referencing.operation.DefaultMathTransformFactory;
import org.geotools.referencing.operation.matrix.GeneralMatrix;
import org.geotools.renderer.lite.RendererUtilities;
import org.geotools.styling.FeatureTypeStyle;
import org.geotools.styling.Graphic;
import org.geotools.styling.LineSymbolizer;
import org.geotools.styling.Mark;
import org.geotools.styling.PointSymbolizer;
import org.geotools.styling.Rule;
import org.geotools.styling.SLD;
import org.geotools.styling.Style;
import org.geotools.styling.Symbolizer;
import org.geotools.styling.TextSymbolizer;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.Filter;
import org.opengis.filter.expression.Expression;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;
import org.vfny.geoserver.wms.responses.map.htmlimagemap.holes.HolesRemover;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryCollection;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.LinearRing;
import com.vividsolutions.jts.geom.MultiLineString;
import com.vividsolutions.jts.geom.MultiPoint;
import com.vividsolutions.jts.geom.MultiPolygon;
import com.vividsolutions.jts.geom.Point;
import com.vividsolutions.jts.geom.Polygon;
/**
* Encodes a layer in HTMLImageMap format.
*
* @author Mauro Bartolomeoli
*/
public class HTMLImageMapWriter extends OutputStreamWriter {
private static final Logger LOGGER = org.geotools.util.logging.Logging.getLogger(HTMLImageMapWriter.class.getPackage().getName());
GeometryFactory gFac=new GeometryFactory();
/** map of geometry class to writer */
private Map<Class<?>,HTMLImageMapFeatureWriter> writers;
WMSMapContent mapContent=null;
/** rect representing screen coordinates space **/
Rectangle mapArea=null;
ReferencedEnvelope mapEnv=null;
Polygon clippingBox=null;
/**
* Transformation from layer (world) coordinates to "screen" coordinates.
*/
private AffineTransform worldToScreen=null;
/**
* Creates a new HTMLImageMapWriter object.
*
* @param out stream to encode the layer to
* @param config current wms context
* @throws ClassCastException
* @throws UnsupportedEncodingException
*/
public HTMLImageMapWriter(OutputStream out, WMSMapContent mapContent) throws UnsupportedEncodingException, ClassCastException {
super(out, guessCharset(mapContent));
this.mapContent=mapContent;
mapEnv = mapContent.getRenderingArea();
clippingBox=envToGeometry(mapEnv);
mapArea=new Rectangle(mapContent.getMapWidth(),mapContent.getMapHeight());
worldToScreen=RendererUtilities.worldToScreenTransform(mapEnv, mapArea);
initWriters();
}
private static String guessCharset(WMSMapContent mapContent) {
GetMapRequest request = mapContent.getRequest();
if (request != null && request.getRequestCharset() != null) {
String requestCharset = request.getRequestCharset();
return requestCharset;
}
return "UTF-8";
}
private Polygon envToGeometry(ReferencedEnvelope env) {
Coordinate[] coordinates=new Coordinate[] {
new Coordinate(env.getMinX(),env.getMinY()),
new Coordinate(env.getMaxX(),env.getMinY()),
new Coordinate(env.getMaxX(),env.getMaxY()),
new Coordinate(env.getMinX(),env.getMaxY()),
new Coordinate(env.getMinX(),env.getMinY())
};
LinearRing bbox=gFac.createLinearRing(coordinates);
return gFac.createPolygon(bbox, new LinearRing[] {});
}
/**
* Initializes every type of writer (one for every kind of geometry).
*
*/
private void initWriters() {
writers = new HashMap<Class<?>,HTMLImageMapFeatureWriter>();
writers.put(Point.class, new PointWriter());
writers.put(LineString.class, new LineStringWriter());
writers.put(LinearRing.class, new LineStringWriter());
writers.put(Polygon.class, new PolygonWriter());
writers.put(MultiPoint.class, new MultiPointWriter());
writers.put(MultiLineString.class, new MultiLineStringWriter());
writers.put(MultiPolygon.class, new MultiPolygonWriter());
writers.put(GeometryCollection.class, new GeometryCollectionWriter());
}
/**
* Encodes a newline
*
* @throws IOException if an error occurs during encoding
public void newline() throws IOException {
super.write('\n');
}*/
/**
* Encodes a single layer (FeatureCollection) using the supplied style.
*
* @param fColl layer to encode
* @param style style to use for encoding
* @throws IOException if an error occurs during encoding
* @throws AbortedException if the operation is aborted
*/
public void writeFeatures(SimpleFeatureCollection fColl, FeatureTypeStyle[] ftsList)
throws IOException, AbortedException {
SimpleFeature ft;
SimpleFeatureIterator iter=null;
try {
SimpleFeatureType featureType = fColl.getSchema();
Class<?> gtype = featureType.getGeometryDescriptor().getType().getBinding();
// iterates through the single features
iter=fColl.features();
while (iter.hasNext()) {
ft = iter.next();
Geometry geo=(Geometry)ft.getDefaultGeometry();
if(!clippingBox.contains(geo)) {
try {
Geometry clippedGeometry=clippingBox.intersection(geo);
ft.setDefaultGeometry(clippedGeometry);
} catch (Throwable e) {
// ignore and use the original geo
}
}
// retrieves the right feature writer (based on the geometry type of the feature)
HTMLImageMapFeatureWriter featureWriter = (HTMLImageMapFeatureWriter) writers.get(ft.getDefaultGeometry().getClass());
// encodes a single feature, using the supplied style and the current featureWriter
featureWriter.writeFeature(ft,ftsList);
ft = null;
}
LOGGER.fine("encoded " + featureType.getTypeName());
} catch (NoSuchElementException ex) {
throw new DataSourceException(ex.getMessage(), ex);
} finally {
if(iter!=null) {
//make sure we always close
iter.close();
}
}
}
/**
* Filters the rules of <code>featureTypeStyle</code> returnting only
* those that apply to <code>feature</code>.
* <p>
* This method returns rules for which:
* <ol>
* <li><code>rule.getFilter()</code> matches <code>feature</code>, or:
* <li>the rule defines an "ElseFilter", and the feature matches no
* other rules.
* </ol>
* This method returns an empty array in the case of which no rules
* match.
* </p>
* @param featureTypeStyle The feature type style containing the rules.
* @param feature The feature being filtered against.
*
*/
Rule[] filterRules(FeatureTypeStyle featureTypeStyle, SimpleFeature feature) {
Rule[] rules = featureTypeStyle.getRules();
if ((rules == null) || (rules.length == 0)) {
return new Rule[0];
}
List<Rule> filtered = new ArrayList<Rule>(rules.length);
//process the rules, keep track of the need to apply an else filters
boolean match = false;
boolean hasElseFilter = false;
for (int i = 0; i < rules.length; i++) {
Rule rule = rules[i];
LOGGER.finer(new StringBuffer("Applying rule: ").append(rule.toString()).toString());
//does this rule have an else filter
if (rule.hasElseFilter()) {
hasElseFilter = true;
continue;
}
/*
double scaleDenominator;
try {
scaleDenominator = RendererUtilities.calculateScale(mapContent.getAreaOfInterest(), mapContent.getMapWidth(), mapContent.getMapHeight(),100);
//is this rule within scale?
if ( !EncodeHTMLImageMap.isWithInScale(rule,scaleDenominator)) {
continue;
}
} catch (TransformException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (FactoryException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}*/
//does this rule have a filter which applies to the feature
Filter filter = rule.getFilter();
if ((filter == null) || filter.evaluate(feature)) {
match = true;
filtered.add(rule);
}
}
//if no rules mached the feautre, re-run through the rules applying
// any else filters
if (!match && hasElseFilter) {
//loop through again and apply all the else rules
for (int i = 0; i < rules.length; i++) {
Rule rule = rules[i];
if (rule.hasElseFilter()) {
filtered.add(rule);
}
}
}
return (Rule[]) filtered.toArray(new Rule[filtered.size()]);
}
/**
* Base Class for all the feature writers.
* An implementation is defined for every geometry type.
*
* @author Mauro Bartolomeoli
*/
private abstract class HTMLImageMapFeatureWriter {
// stores a series of attributes to append to the feature tag definition
Map<String,String> extraAttributes=new HashMap<String,String>();
StringBuffer buffer=new StringBuffer();
/**
* Encodes a single feature.
* Default implementation.
* The encoding is accomplished through many phases:
* 1) reset writer state
* 2) process supplied style and apply filters to decide if the feature has to be included
* in output. If the feature has to be included, proceed with the following phases, else go to the
* next feature.
* 3) start feature encoding
* 4) pre geometry encoding
* 5) actual geometry encoding
* 6) post geometry encoding
* 7) end feature encoding
* @param ft feature to encode
* @param style style to use for the encoding
* @param fts "cached" ftss matching the FeatureType of the feature
* @throws IOException if an error occurs during encoding
*/
protected void writeFeature(SimpleFeature ft,FeatureTypeStyle[] fts) throws IOException {
// a new feature begins, reset accumulated info, such as extraAttributes
reset(ft);
// process the supplied style and store rendering info for the following phases
// the style processing applies filters to the feature to decide if it has to be included
// in output
if(processStyle(ft,fts)) {
try {
Geometry geo=(Geometry)ft.getDefaultGeometry();
if(geo!=null) {
// encodes starting element
startElement(ft,"");
// pre geometry encoding phase
startGeometry(geo);
// actual geometry encoding phase
writeGeometry(geo,buffer);
// post geometry encoding phase
endGeometry(geo);
// encodes ending element
endElement(ft);
// if everything has been correctly encoded,
// we commit the buffer content to the stream
commitBuffer();
} else {
buffer=new StringBuffer();
if(LOGGER.isLoggable(Level.WARNING))
LOGGER.warning("null geometry");
}
} catch(IOException e) {
buffer=new StringBuffer();
if(LOGGER.isLoggable(Level.WARNING))
LOGGER.warning("Problems encoding shape: "+e.getMessage());
} catch(Throwable t) {
buffer=new StringBuffer();
if(LOGGER.isLoggable(Level.SEVERE))
LOGGER.severe("Problems encoding shape: "+t.getMessage());
}
}
}
protected void commitBuffer() throws IOException {
write(buffer.toString());
buffer=new StringBuffer();
}
/**
* Encodes a "MultiFeature", a feature with multiple geometries.
* Default implementation.
* The encoding is accomplished through many phases:
* 1) reset writer state
* 2) process supplied style and apply filters to decide if the feature has to be included
* in output. If the feature has to be included, proceed with the following phases, else go to the
* next feature.
* 3) loops for all the geometries, with the following phases for every single geometry.
* a) start feature encoding
* b) pre geometry encoding
* c) actual geometry encoding
* d) post geometry encoding
* e) end feature encoding
* @param ft feature to encode
* @param style style to use for the encoding
* @param fts "cached" ftss matching the FeatureType of the feature
* @throws IOException if an error occurs during encoding
*/
protected void writeMultiFeature(SimpleFeature ft,FeatureTypeStyle[] fts) throws IOException {
reset(ft);
if(processStyle(ft,fts)) {
GeometryCollection geomCollection = (GeometryCollection) ft.getDefaultGeometry();
for (int i = 0; i < geomCollection.getNumGeometries(); i++) {
try {
Geometry geo=geomCollection.getGeometryN(i);
if(geo!=null) {
startElement(ft,"."+i);
startGeometry(geo);
writeGeometry(geo,buffer);
endGeometry(geo);
endElement(ft);
commitBuffer();
} else {
if(LOGGER.isLoggable(Level.WARNING))
LOGGER.warning("Problems encoding shape: null geometry");
}
} catch(IOException e) {
buffer=new StringBuffer();
if(LOGGER.isLoggable(Level.WARNING))
LOGGER.warning("Problems encoding shape: "+e.getMessage());
} catch(Throwable t) {
buffer=new StringBuffer();
if(LOGGER.isLoggable(Level.SEVERE))
LOGGER.severe("Problems encoding shape: "+t.getMessage());
}
}
}
}
/**
* Encodes the feature starting tag (area).
*
* @param feature feature to encode
* @param suffix (optional) suffix to append to the tag id (useful to have different ids in
* the multigeometry scenario.
*
* @throws IOException if an error occures during encoding
*/
protected void startElement(SimpleFeature feature,String suffix)
throws IOException {
// each feature (multi geometry ones are an exception) is represented by an <area> tag
// each area tag has an id, equal to the feature id, and a shape (rect, poly or circle)
writeToBuffer("<area shape=\""+getShape()+"\" id=\""+feature.getID()+suffix+"\" ",buffer);
}
/**
* Encodes the geometry definition attribute (coords).
*
* @param geom geometry to encode
*
* @throws IOException if an error occures during encoding
*/
protected void startGeometry(Geometry geom) throws IOException {
writeToBuffer(" coords=\"",buffer);
}
/**
* Each area tag has a shape attribute, defining the coords attribute meaning. The W3C HTML 4.0
* standard defines 3 possible shape values: rect, poly and circle.
* @return the writer associated shape value
* @throws IOException if an error occures during encoding
*/
protected abstract String getShape() throws IOException;
/**
* Encodes the actual geometry.
*
* @param geom geometry to encode
*
* @throws IOException if an error occures during encoding
*/
protected abstract void writeGeometry(Geometry geom,StringBuffer buffer)
throws IOException;
/**
* Encodes the geometry "ending" (closing quotes)
*
* @param geom geometry to encode
*
* @throws IOException if an error occures during encoding
*/
protected void endGeometry(Geometry geom) throws IOException {
writeToBuffer("\"",buffer);
}
/**
* Encodes feature ending. extraAttributes accumulated till now are encoded and the area tag is closed
*
* @param feature feature to encode
*
* @throws IOException if an error occures during encoding
*/
protected void endElement(SimpleFeature feature) throws IOException {
Iterator<String> iter=extraAttributes.keySet().iterator();
while(iter.hasNext()) {
String attrName=iter.next();
writeToBuffer(" "+attrName+"=\""+extraAttributes.get(attrName)+"\"",buffer);
}
writeToBuffer("/>\n",buffer);
}
/**
* Resets writer status.
* extraAttributes is emptied
* @param ft current feature to encode
*/
protected void reset(SimpleFeature ft) {
extraAttributes=new HashMap<String,String>();
buffer=new StringBuffer();
}
/**
* Analyze the supplied style and process any matching rule.
*
* @param ft feature to which the style is going to be applied
* @param style style to process
* @param ftsList cached fts matching the feature
* @return true if the supplied feature has to be included in the output according to
* style filters.
* @throws IOException if an error occurs during the process
*/
protected boolean processStyle(SimpleFeature ft,FeatureTypeStyle[] ftsList)
throws IOException {
int total=0;
for(int i=0;i<ftsList.length;i++) {
FeatureTypeStyle fts=ftsList[i];
Rule[] rules=filterRules(fts, ft);
total+=rules.length;
for(int j=0;j<rules.length;j++)
processRule(ft,rules[j]);
}
if(total==0)
return false;
return true;
}
/**
* Process a single style rule and apply meaningful style to the feature
* @param ft feature to which the rule has to be applied
* @param rule rule to process
* @throws IOException if an error occurs during the process
*/
protected void processRule(SimpleFeature ft,Rule rule)
throws IOException {
Symbolizer[] symbolizers=rule.getSymbolizers();
for(int i=0;i<symbolizers.length;i++) {
Symbolizer symbolizer=symbolizers[i];
// process any given symbolizer
processSymbolizer(ft,rule,symbolizer);
}
}
/**
* Process a single style symbolizer and apply meaningful style to the feature.
* The default implementation processes TextSymbolizer, using Label definition to apply textual
* attributes to the area tag.
* @param ft feature to which the symbolizer has to be applied
* @param rule current rule to analyze
* @param symbolizer current symbolizer to analyze
* @throws IOException if an error occurs during the process
*/
protected void processSymbolizer(SimpleFeature ft,Rule rule,Symbolizer symbolizer) throws IOException{
if(symbolizer instanceof TextSymbolizer) {
// TODO: any check for label definition needed here?
Expression e = SLD.textLabel((TextSymbolizer) symbolizer);
// eval label actual value
Object object = e.evaluate(ft);
String value = null;
if (object instanceof String) {
value = (String) object;
} else {
if (object != null) {
value = object.toString();
}
}
// if any label is defined append a new extra attribute
// the attribute name is equal to the current rule name (if defined, defaults to "title")
// the value of the attribute is the current label value
if ((value != null) && !"".equals(value.trim())) {
String attrName=rule.getName();
if(attrName==null || attrName.trim().equals(""))
attrName="title";
extraAttributes.put(attrName,value);
}
}
}
/**
* Gets a point in screen coordinates from a Coordinate in world coordinates
* @param c projected coordinate
* @return screen coordinates in textual form (x,y)
*/
protected String getPoint(Coordinate c) {
Point2D transformed=worldToScreen.transform(new Point2D.Double(c.x,c.y),null);
return (int)Math.round(transformed.getX())+","+(int)Math.round(transformed.getY());
}
/**
* Encodes a list of coordinates in textual form (for the coords attribute)
* <i>coords</i> Area attribute<p>
*
* @param coords coordinates to encode
*
* @throws IOException if an error occurs during encoding
*/
protected void writePathContent(Coordinate[] coords,StringBuffer buf)
throws IOException {
StringBuffer tempBuf=new StringBuffer();
int nCoords = coords.length;
for(int i=0;i<nCoords;i++) {
Coordinate curr = coords[i];
String p=getPoint(curr);
tempBuf.append(" "+p);
}
// Close the path if it's not already closed
if(!coords[nCoords-1].equals2D(coords[0]))
tempBuf.append(" "+coords[0].x+","+coords[0].y);
if(tempBuf.length()>0)
writeToBuffer(tempBuf.substring(1),buf);
else
throw new IOException("No coordinates");
}
protected void writeToBuffer(String substring,StringBuffer buf) {
buf.append(substring);
}
/**
* Simplifies a geometry to exclude duplicated points. When translating from world
* to screen coordinates it's possible that many world points collapse to a single screen point.
* Those colliding points are simplified to a single point.
* @param geom
*
*/
Geometry decimate(Geometry geom) {
DefaultMathTransformFactory f= new DefaultMathTransformFactory();
MathTransform xform=null;
try {
xform = f.createAffineTransform(new GeneralMatrix(worldToScreen.createInverse()));
Decimator decimator=new Decimator(xform,mapArea);
geom=decimator.decimate(geom);
} catch (FactoryException e1) {
} catch (NoninvertibleTransformException e1) {
}
catch (Exception e1) {
}
return geom;
}
}
/**
* FeatureWriter for point geometry features.
* Currently supports circle WellKnownName Marks.
*/
private class PointWriter extends HTMLImageMapFeatureWriter {
// size of the symbol
double size = 2;
/**
* Creates a new PointWriter object.
*/
public PointWriter() {
}
/**
* The shape for points is a circle.
*/
protected String getShape() throws IOException {
return "circle";
}
/**
* Uses the supplied style to define point rendering.
* Currently it gets WellKnownName from a Mark (circle is the only value correctly rendered by now).
* It also uses the Size parameter to define circle radius.
*/
protected void processSymbolizer(SimpleFeature ft, Rule rule,
Symbolizer symbolizer) throws IOException {
super.processSymbolizer(ft, rule, symbolizer);
if (symbolizer instanceof PointSymbolizer) {
Mark mark = SLD.mark((PointSymbolizer) symbolizer);
Graphic graphic = SLD.graphic((PointSymbolizer) symbolizer);
if (graphic != null && mark != null) {
Object oSize = graphic.getSize().evaluate(null);
if (oSize != null)
size = Double.parseDouble(oSize.toString());
}
}
}
/**
* Actually encodes the point.
*
* @param geom point to encode
*
* @throws IOException if an error occures during encoding
*/
protected void writeGeometry(Geometry geom, StringBuffer buf)
throws IOException {
if (geom instanceof Point) {
Point p = (Point) geom;
if (p.getCoordinate() != null) {
writeToBuffer(
getPoint(p.getCoordinate()) + "," + (int) Math.round(size),
buf);
} else
throw new IOException("null point coordinate");
} else
throw new IOException("Wrong geometry: it should be a Point");
}
}
/**
* FeatureWriter for multipoint geometry features.
*/
private class MultiPointWriter extends PointWriter {
/**
* Creates a new MultiPointWriter object.
*/
public MultiPointWriter() {
}
/**
* Uses writeMultiFeature.
*/
protected void writeFeature(SimpleFeature ft,FeatureTypeStyle[] fts) throws IOException {
writeMultiFeature(ft, fts);
}
}
/**
* FeatureWriter for LineString geometry features.
* A buffer is applied to the linear geometry to transform it to a Polygon.
* The result polygon is then encoded.
* @author Mauro Bartolomeoli
*
*/
private class LineStringWriter extends HTMLImageMapFeatureWriter {
// default buffer size (in screen coordinates)
int buffer=2;
/**
* Creates a new LineStringWriter object.
*/
public LineStringWriter() {
}
/**
* The shape for lines is a poly.
*/
protected String getShape() throws IOException {
return "poly";
}
/**
* Uses the supplied style to define line rendering.
* Currently it gets stroke-width to define the buffer around the linestring.
*/
protected void processSymbolizer(SimpleFeature ft, Rule rule,Symbolizer symbolizer) throws IOException{
super.processSymbolizer(ft, rule,symbolizer);
if(symbolizer instanceof LineSymbolizer) {
buffer=SLD.width((LineSymbolizer)symbolizer);
}
}
/**
* Actually encodes the linestring.
*
* @param geom line to encode
*
* @throws IOException if an error occures during encoding
*/
protected void writeGeometry(Geometry geom,StringBuffer buf) throws IOException {
if(geom instanceof LineString) {
LineString l = (LineString) geom;
try {
// transform buffer dimension to world coordinates
double bufferMultiplier=worldToScreen.createInverse().getScaleX();
// gets buffered linestring
Geometry buffered=l.buffer(buffer*bufferMultiplier);
if(buffered instanceof Polygon) {
Polygon poly=(Polygon)decimate(buffered);
if(poly!=null) {
LineString shell = poly.getExteriorRing();
if(shell!=null && shell.getCoordinates()!=null)
writePathContent(shell.getCoordinates(),buf);
else
throw new IOException("Nothing to encode");
} else
throw new IOException("Nothing to encode");
} else {
throw new IOException("Impossible to encode: "+buffered);
//TODO: what kind of geometry can a buffer operation
// return?
}
} catch (NoninvertibleTransformException e) {
throw new IOException(e.getMessage());
}
} else
throw new IOException("Wrong geometry: it should be a LineString");
}
}
/**
* FeatureWriter for multiline geometry features.
*/
private class MultiLineStringWriter extends LineStringWriter {
/**
* Creates a new MultiLineStringWriter object.
*/
public MultiLineStringWriter() {
}
/**
* Uses writeMultiFeature.
*/
protected void writeFeature(SimpleFeature ft,FeatureTypeStyle[] fts) throws IOException {
writeMultiFeature(ft, fts);
}
}
/**
* FeatureWriter for Polygon geometry features.
*/
private class PolygonWriter extends HTMLImageMapFeatureWriter {
/**
* Creates a new PolygonWriter object.
*/
public PolygonWriter() {
}
/**
* The shape for polygons is a poly.
*/
protected String getShape() throws IOException {
return "poly";
}
/**
* Actually encodes the polygon.
*
* @param geom the polygon to encode
*
* @throws IOException if an error occures during encoding
*/
protected void writeGeometry(Geometry geom,StringBuffer buf) throws IOException {
Polygon poly=null;
if(geom instanceof Polygon) {
poly=(Polygon)geom;
// if we have any hole
// we create a new polygon without holes
// using the HolesRemover
if(poly.getNumInteriorRing()>0) {
poly=HolesRemover.removeHoles(poly,1.0/worldToScreen.getScaleX());
}
poly=(Polygon)decimate(poly);
} else
throw new IOException("Impossible to encode: "+geom);
if(poly!=null) {
LineString shell = poly.getExteriorRing();
if(shell!=null && shell.getCoordinates()!=null)
writePathContent(shell.getCoordinates(),buf);
else
throw new IOException("Nothing to encode");
} else
throw new IOException("Nothing to encode");
}
}
/**
* FeatureWriter for multipolygon geometry features.
*/
private class MultiPolygonWriter extends PolygonWriter {
/**
* Creates a new MultiPolygonWriter object.
*/
public MultiPolygonWriter() {
}
/**
* Uses writeMultiFeature.
*/
protected void writeFeature(SimpleFeature ft,FeatureTypeStyle[] fts) throws IOException {
writeMultiFeature(ft, fts);
}
}
/**
* FeatureWriter for multipolygon geometry features.
*/
private class GeometryCollectionWriter extends HTMLImageMapFeatureWriter {
HTMLImageMapFeatureWriter delegateWriter=null;
/**
* Creates a new MultiPolygonWriter object.
*/
public GeometryCollectionWriter() {
}
/**
* Encodes the GeometryCollection.
*
* The encoding is accomplished through many phases:
* 1) reset writer state
* 2) loops for all the geometries, with the following phases for every single geometry.
* a) process supplied style
* b) start feature encoding
* c) pre geometry encoding
* d) actual geometry encoding
* e) post geometry encoding
* f) end feature encoding
* A delegate is used for many of these phases. The delegate is a specific FeatureWriter for the
* single geometry, during the loop.
* @param ft feature to encode
* @param style style to use for the encoding
* @param fts "cached" ftss matching the FeatureType of the feature
* @throws IOException if an error occurs during encoding
*/
protected void writeFeature(SimpleFeature ft,FeatureTypeStyle[] fts) throws IOException {
reset(ft);
GeometryCollection geomCollection = (GeometryCollection) ft.getDefaultGeometry();
for (int i = 0; i < geomCollection.getNumGeometries(); i++) {
Geometry geom=geomCollection.getGeometryN(i);
if(geom!=null) {
Class<?> gtype = geom.getClass();
// retrieves the right feature writer (based on the current geometry type)
delegateWriter = (HTMLImageMapFeatureWriter) writers.get(gtype);
if(processStyle(ft,fts)) {
try {
startElement(ft,"."+i);
startGeometry(geom);
writeGeometry(geom,buffer);
endGeometry(geom);
endElement(ft);
commitBuffer();
} catch(IOException e) {
buffer=new StringBuffer();
if(LOGGER.isLoggable(Level.WARNING))
LOGGER.warning("Problems encoding shape: "+e.getMessage());
} catch(Throwable t) {
buffer=new StringBuffer();
if(LOGGER.isLoggable(Level.SEVERE))
LOGGER.severe("Problems encoding shape: "+t.getMessage());
}
}
} else {
buffer=new StringBuffer();
if(LOGGER.isLoggable(Level.WARNING))
LOGGER.warning("Problems encoding shape: null geometry");
}
}
}
protected String getShape() throws IOException {
return delegateWriter.getShape();
}
/**
* Analyze the supplied style and process any matching rule.
*
* @param ft feature to which the style is going to be applied
* @param style style to process
* @param ftsList cached fts matching the feature
* @return true if the style filters "accept" the feature
* @throws IOException if an error occurs during the process
*/
protected boolean processStyle(SimpleFeature ft,FeatureTypeStyle[] ftsList)
throws IOException {
if(delegateWriter.processStyle(ft, ftsList)) {
Iterator<String> iter=delegateWriter.extraAttributes.keySet().iterator();
while(iter.hasNext()) {
String attrName=(String)iter.next();
extraAttributes.put(attrName,delegateWriter.extraAttributes.get(attrName));
}
return true;
} else
return false;
}
/**
* Actually write the geometry (through the delegate).
*/
protected void writeGeometry(Geometry geom,StringBuffer buf) throws IOException {
if(geom!=null)
delegateWriter.writeGeometry(geom,buf);
else
throw new IOException("null geometry");
}
}
}