Application: gvSIG desktop

package org.gvsig.labeling.label;

import java.awt.Graphics2D;

import java.awt.geom.Point2D;

import java.awt.image.BufferedImage;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.TreeMap;

import java.util.TreeSet;

import org.cresques.cts.ICoordTrans;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.gvsig.compat.print.PrintAttributes;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.exception.ReadException;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor;

import org.gvsig.fmap.dal.feature.FeatureSet;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.Geometry.SUBTYPES;

import org.gvsig.fmap.geom.Geometry.TYPES;

import org.gvsig.fmap.geom.GeometryException;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.aggregate.MultiPrimitive;

import org.gvsig.fmap.geom.operation.GeometryOperationException;

import org.gvsig.fmap.geom.operation.GeometryOperationNotSupportedException;

import org.gvsig.fmap.geom.primitive.Envelope;

import org.gvsig.fmap.geom.primitive.Point;

import org.gvsig.fmap.geom.type.GeometryType;

import org.gvsig.fmap.mapcontext.ViewPort;

import org.gvsig.fmap.mapcontext.layers.FLayer;

import org.gvsig.fmap.mapcontext.layers.vectorial.FLyrVect;

import org.gvsig.fmap.mapcontext.rendering.legend.styling.ILabelClass;

import org.gvsig.fmap.mapcontext.rendering.legend.styling.ILabelingMethod;

import org.gvsig.fmap.mapcontext.rendering.legend.styling.ILabelingStrategy;

import org.gvsig.fmap.mapcontext.rendering.legend.styling.IPlacementConstraints;

import org.gvsig.fmap.mapcontext.rendering.legend.styling.IZoomConstraints;

import org.gvsig.fmap.mapcontext.rendering.symbols.CartographicSupport;

import org.gvsig.i18n.Messages;

import org.gvsig.labeling.lang.LabelClassUtils;

import org.gvsig.labeling.placements.ILabelPlacement;

import org.gvsig.labeling.placements.LinePlacementConstraints;

import org.gvsig.labeling.placements.MultiShapePlacementConstraints;

import org.gvsig.labeling.placements.PlacementManager;

import org.gvsig.labeling.placements.PointPlacementConstraints;

import org.gvsig.labeling.placements.PolygonPlacementConstraints;

import org.gvsig.labeling.placements.RemoveDuplicatesComparator;

import org.gvsig.labeling.symbol.SmartTextSymbol;

import org.gvsig.labeling.symbol.SymbolUtils;

import org.gvsig.symbology.SymbologyLocator;

import org.gvsig.symbology.fmap.mapcontext.rendering.legend.styling.LabelLocationMetrics;

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.dispose.DisposableIterator;

import org.gvsig.tools.dynobject.DynStruct;

import org.gvsig.tools.persistence.PersistenceManager;

import org.gvsig.tools.persistence.PersistentState;

import org.gvsig.tools.persistence.exception.PersistenceException;

import org.gvsig.tools.task.Cancellable;

public class GeneralLabelingStrategy implements IGeneralLabelingStrategy {

        private static final Logger logger = LoggerFactory

                        .getLogger(GeneralLabelingStrategy.class);

        public static final String GENERAL_LABEL_STRATEGY_PERSISTENCE_NAME = "GENERAL_LABEL_STRATEGY_PERSISTENCE_NAME";

        public static PointPlacementConstraints DefaultPointPlacementConstraints = new PointPlacementConstraints();

        public static LinePlacementConstraints DefaultLinePlacementConstraints = new LinePlacementConstraints();

        public static PolygonPlacementConstraints DefaultPolygonPlacementConstraints = new PolygonPlacementConstraints();

        private static String[] NO_TEXT = { Messages.getText("text_field") };

        private static MultiShapePlacementConstraints DefaultMultiShapePlacementConstratints = new MultiShapePlacementConstraints();

        private ILabelingMethod method;

        private IPlacementConstraints placementConstraints;

        private IZoomConstraints zoomConstraints;

        private boolean allowOverlapping;

        protected FLyrVect layer;

        // private long parseTime;

        private int unit;

        private int referenceSystem;

        // private double sizeAfter;

        private boolean printMode = false; /*

                                                                                 * indicate whether output is for a

                                                                                 * print product (PDF, PS, ...)

                                                                                 */

        private List<Geometry> drawnGeometryLabels;

        public GeneralLabelingStrategy() {

                method = SymbologyLocator.getSymbologyManager()

                                .createDefaultLabelingMethod();

        }

        public void setLayer(FLayer layer) {

                FLyrVect l = (FLyrVect) layer;

                this.layer = l;

        }

        public ILabelingMethod getLabelingMethod() {

                return method;

        }

        public void setLabelingMethod(ILabelingMethod method) {

                this.method = method;

        }

        private class GeometryItem {

                public Geometry geom = null;

                public int weigh = 0;

                public double savedPerimeter;

                public GeometryItem(Geometry geom, int weigh) {

                        this.geom = geom;

                        this.weigh = weigh;

                        this.savedPerimeter = 0;

                }

        }

    public void draw(BufferedImage mapImage, Graphics2D mapGraphics, double scale, ViewPort viewPort,

        Cancellable cancel, double dpi) throws ReadException {

        drawnGeometryLabels = new ArrayList<Geometry>(1000);

        int x = (int) viewPort.getOffset().getX();

        int y = (int) viewPort.getOffset().getY();

        // offsets for page generation (PDF, PS, direct printing)

        int print_offset_x = x;

        int print_offset_y = y;

        if (printMode) {

            // for printing, we never offset the labels themselves

            x = 0;

            y = 0;

            printMode = false;

        }

        TreeMap<String[], GeometryItem> labelsToPlace = null;

        String[] usedFields = getUsedFields();

        int notPlacedCount = 0;

        int placedCount = 0;

        /*

         * Get the label placement solvers according the user's settings

         */

        ILabelPlacement placement = PlacementManager.getPlacement(getPlacementConstraints(), layer.getShapeType());

        BufferedImage targetBI;

        Graphics2D targetGr;

        /*

         * get an ordered set of the LabelClasses up on the label priority

         */

        ILabelClass[] lcs = method.getLabelClasses();

        TreeSet<ILabelClass> ts = new TreeSet<ILabelClass>(new LabelClassComparatorByPriority());

        for (int i = 0; i < lcs.length; i++)

            ts.add(lcs[i]);

        if (ts.size() == 0)

            return;

        /*

         * now we have an ordered set, it is only need to give a pass for each

         * label class to render by priorities.

         *

         * If no priorities were defined, the following loop only executes once

         */

        for (ILabelClass lc : ts) {

            if (!lc.isVisible(scale)) {

                /*

                 * Avoid non-visible labels

                 */

                continue;

            }

            FeatureSet fset = null;

            DisposableIterator diter = null;

            try {

                try {

                    fset = method.getFeatureIteratorByLabelClass(layer, lc, viewPort, usedFields);

                } catch (DataException e) {

                    throw new ReadException(layer.getFeatureStore().getProviderName(), e);

                }

                // duplicates treatment stuff

                /* handle the duplicates mode */

                int duplicateMode = getDuplicateLabelsMode();

                if (duplicateMode == IPlacementConstraints.REMOVE_DUPLICATE_LABELS) {

                    // we need to register the labels already placed

                    labelsToPlace = new TreeMap<String[], GeometryItem>(new RemoveDuplicatesComparator());

                }

                boolean bLabelsReallocatable = !isAllowingOverlap();

                BufferedImage overlapDetectImage = null;

                Graphics2D overlapDetectGraphics = null;

                if (bLabelsReallocatable) {

                    int width = viewPort.getImageWidth() + print_offset_x;

                    if (width < 0) {

                        width = 1;

                    }

                    int height = viewPort.getImageHeight() + print_offset_y;

                    if (height < 0) {

                        height = 1;

                    }

                    if (mapImage != null)

                        overlapDetectImage =

                            new BufferedImage(mapImage.getWidth() + print_offset_x, mapImage.getHeight()

                                + print_offset_y, BufferedImage.TYPE_INT_ARGB);

                    else

                        overlapDetectImage =

                            new BufferedImage(viewPort.getImageWidth() + print_offset_x, viewPort.getImageHeight()

                                + print_offset_y, BufferedImage.TYPE_INT_ARGB);

                    overlapDetectGraphics = overlapDetectImage.createGraphics();

                    overlapDetectGraphics.setRenderingHints(mapGraphics.getRenderingHints());

                }

                if (bLabelsReallocatable) {

                    targetBI = overlapDetectImage;

                    targetGr = overlapDetectGraphics;

                    targetGr.translate(-x, -y);

                } else {

                    targetBI = mapImage;

                    targetGr = mapGraphics;

                }

                try {

                    diter = fset.fastIterator();

                } catch (DataException e) {

                    throw new ReadException(layer.getFeatureStore().getProviderName(), e);

                }

                Feature featu = null;

                Geometry geome = null;

                while (!cancel.isCanceled() && diter.hasNext()) {

                    featu = ((Feature) diter.next()).getCopy();

                    geome = featu.getDefaultGeometry();

                    if (geome == null || geome.getType() == Geometry.TYPES.NULL) {

                        continue;

                    }

                    ICoordTrans ct = layer.getCoordTrans();

                    if( ct!=null ) {

                        geome.reProject(ct);

                    }

                    if (!setupLabel(featu, lc, cancel, usedFields, viewPort, dpi, duplicateMode)) {

                        continue;

                    }

                    String[] texts = lc.getTexts();

                    if (duplicateMode == IPlacementConstraints.REMOVE_DUPLICATE_LABELS) {

                        // check if this text (so label) is already present in

                        // the map

                        GeometryItem item = labelsToPlace.get(texts);

                        if (item == null) {

                            item = new GeometryItem(geome, 0);

                            labelsToPlace.put(texts, item);

                        }

                        if (item.geom != null) {

                            notPlacedCount++;

                            if (geome.getType() != Geometry.TYPES.POINT) {

                                Envelope auxBox = geome.getEnvelope();

                                double perimeterAux = 2 * (auxBox.getLength(0) + auxBox.getLength(1));

                                if (perimeterAux > item.savedPerimeter) {

                                    item.geom = geome; // FConverter.jts_to_igeometry(jtsGeom);

                                    item.savedPerimeter = perimeterAux;

                                }

                            } else {

                                int weigh = item.weigh;

                                try {

                                    Point pointFromLabel = item.geom.centroid();

                                    Point pointGeome = geome.centroid();

                                    item.geom =

                                        GeometryLocator.getGeometryManager().createPoint(

                                            (pointFromLabel.getX() * weigh + pointGeome.getX()) / (weigh + 1),

                                            (pointFromLabel.getY() * weigh + pointGeome.getY()) / (weigh + 1),

                                            Geometry.SUBTYPES.GEOM2D);

                                } catch (Exception ex) {

                                    throw new ReadException(layer.getFeatureStore().getProviderName(), ex);

                                }

                            }

                        } else {

                            item.geom = geome;

                        }

                        item.weigh++;

                    } else {

                        // Check if size is a pixel

                        if (isOnePoint(viewPort, geome)) {

                            continue;

                        }

                        List<Geometry> geome_parts = new ArrayList<Geometry>();

                        if (duplicateMode == IPlacementConstraints.ONE_LABEL_PER_FEATURE_PART) {

                            geome_parts = getGeometryParts(geome);

                        } else {

                            geome_parts.add(geome);

                        }

                        try {

                            int n = geome_parts.size();

                            for (int k = 0; k < n; k++) {

                                drawLabelInGeom(targetBI, targetGr, lc, placement, viewPort, geome_parts.get(k),

                                    cancel, dpi, bLabelsReallocatable);

                            }

                        } catch (GeometryException e) {

                            throw new ReadException(layer.getFeatureStore().getProviderName(), e);

                        }

                        placedCount++;

                    }

                }

                // ======= End iteration in feature set ====================

                if (duplicateMode == IPlacementConstraints.REMOVE_DUPLICATE_LABELS) {

                    Iterator<String[]> textsIt = labelsToPlace.keySet().iterator();

                    while (!cancel.isCanceled() && textsIt.hasNext()) {

                        notPlacedCount++;

                        String[] texts = textsIt.next();

                        GeometryItem item = labelsToPlace.get(texts);

                        if (item != null) {

                            lc.setTexts(texts);

                            // Check if size is a pixel

                            if (isOnePoint(viewPort, item.geom)) {

                                continue;

                            }

                            try {

                                drawLabelInGeom(targetBI, targetGr, lc, placement, viewPort, item.geom, cancel, dpi,

                                    bLabelsReallocatable);

                            } catch (GeometryException e) {

                                throw new ReadException(layer.getFeatureStore().getProviderName(), e);

                            }

                        }

                    }

                }

                if (bLabelsReallocatable) {

                    targetGr.translate(x, y);

                    if (mapImage != null) {

                        mapGraphics.drawImage(overlapDetectImage, null, null);

                    } else {

                        mapGraphics.drawImage(overlapDetectImage, null, null);

                    }

                }

            } finally {

                if (diter != null) {

                    diter.dispose();

                }

                if (fset != null) {

                    fset.dispose();

                }

            }

        } // big iteration

    }

        private List<Geometry> getGeometryParts(Geometry ge) {

                List<Geometry> resp = new ArrayList<Geometry>();

                if (ge != null) {

                        if (ge instanceof MultiPrimitive) {

                                MultiPrimitive mp = (MultiPrimitive) ge;

                                int n = mp.getPrimitivesNumber();

                                for (int i = 0; i < n; i++) {

                                        resp.add(mp.getPrimitiveAt(i));

                                }

                        } else {

                                resp.add(ge);

                        }

                }

                return resp;

        }

        private void drawLabelInGeom(BufferedImage targetBI, Graphics2D targetGr,

                        ILabelClass lc, ILabelPlacement placement, ViewPort viewPort,

                        Geometry geom, Cancellable cancel, double dpi,

                        boolean bLabelsReallocatable) throws GeometryException {

                lc.toCartographicSize(viewPort, dpi, null);

                ArrayList<LabelLocationMetrics> llm = null;

                llm = placement.guess(lc, geom, getPlacementConstraints(), 0, cancel,

                                viewPort);

                setReferenceSystem(lc.getReferenceSystem());

                setUnit(lc.getUnit());

                /*

                 * search if there is room left by the previous and with more priority

                 * labels, then check the current level

                 */

                lookupAndPlaceLabel(targetBI, targetGr, llm, placement, lc, geom,

                                viewPort, cancel, bLabelsReallocatable);

        }

        private int getDuplicateLabelsMode() {

                if (getPlacementConstraints() == null) {

                        return IPlacementConstraints.DefaultDuplicateLabelsMode;

                }

                return getPlacementConstraints().getDuplicateLabelsMode();

        }

        private boolean lookupAndPlaceLabel(BufferedImage bi, Graphics2D g,

                        ArrayList<LabelLocationMetrics> llm, ILabelPlacement placement,

                        ILabelClass lc, Geometry geom, ViewPort viewPort,

                        Cancellable cancel, boolean bLabelsReallocatable)

                        throws GeometryException {

            GeometryManager gm = GeometryLocator.getGeometryManager();

                int i;

                for (i = 0; !cancel.isCanceled() && i < llm.size(); i++) {

                        LabelLocationMetrics labelMetrics = llm.get(i);

                        IPlacementConstraints pc = getPlacementConstraints();

                        if (pc instanceof MultiShapePlacementConstraints) {

                                MultiShapePlacementConstraints mpc = (MultiShapePlacementConstraints) pc;

                                GeometryType geom_gt = null;

                                geom_gt = gm.getGeometryType(geom.getType(), SUBTYPES.GEOM2D);

                                if (geom_gt.getType() == TYPES.POINT

                                                || geom_gt.getType() == TYPES.MULTIPOINT) {

                                        pc = mpc.getPointConstraints();

                                } else {

                                        if (geom_gt.isTypeOf(TYPES.CURVE)

                                                        || geom_gt.getType() == TYPES.MULTICURVE) {

                                                pc = mpc.getLineConstraints();

                                        } else {

                                                if (geom_gt.isTypeOf(TYPES.SURFACE)

                                                                || geom_gt.getType() == TYPES.MULTISURFACE) {

                                                        pc = mpc.getPolygonConstraints();

                                                }

                                        }

                                }

                        }

                        /*

                         * Ver comentario en el metodo drawLabelInGeom

                         */

                        if (bLabelsReallocatable) {

                                Geometry aux_geom = null;

                                aux_geom = lc.getShape(labelMetrics);

                                if (!isOverlapping(bi, aux_geom)) {

                                        if (!pc.isFollowingLine()) {

                                                lc.draw(g, labelMetrics, geom);

                                        } else {

                                                ILabelClass smsLc = new SmartTextSymbolLabelClass();

                                                SmartTextSymbol sms = new SmartTextSymbol(

                                                                lc.getTextSymbol(), pc);

                                                double sizeBefore = lc.getTextSymbol().getFont()

                                                                .getSize();

                                                double sizeAfter = SymbolUtils.getCartographicLength(

                                                                this, sizeBefore, viewPort, viewPort.getDPI());

                                                sms.setFontSize(sizeAfter);

                                                smsLc.setTextSymbol(sms);

                                                geom.transform(viewPort.getAffineTransform());

                                                smsLc.draw(g, null, geom);

                                                sms.setFontSize(sizeBefore);

                                        }

                                        return true;

                                }

                        } else {

                                if (!pc.isFollowingLine()) {

                                        lc.draw(g, labelMetrics, null);

                                } else {

                                        ILabelClass smsLc = new SmartTextSymbolLabelClass();

                                        SmartTextSymbol sms = new SmartTextSymbol(

                                                        lc.getTextSymbol(), pc);

                                        double sizeBefore = lc.getTextSymbol().getFont().getSize();

                                        double sizeAfter = SymbolUtils.getCartographicLength(this,

                                                        sizeBefore, viewPort, viewPort.getDPI());

                                        sms.setFontSize(sizeAfter);

                                        smsLc.setTextSymbol(sms);

                                        geom.transform(viewPort.getAffineTransform());

                                        smsLc.draw(g, null, geom);

                                        sms.setFontSize(sizeBefore);

                                }

                                return true;

                        }

                }

                return false;

        }

        /**

         * Divide una cadena de caracteres por el caracter dos puntos siempre que no

         * est? entre comillas.

         *

         * @param str

         *            Cadena de caracteres

         *

         * @return String[]

         *

         */

        private String[] divideExpression(String str) {

                ArrayList<String> r = new ArrayList<String>();

                boolean inQuotationMarks = false;

                int lastIndex = 0;

                for (int i = 0; i < str.length(); i++) {

                        String currentChar = str.substring(i, i + 1);

                        if (currentChar.compareTo("\"") == 0 ) {

                                inQuotationMarks = !inQuotationMarks;

                                // Si es el cierre de las comillas

                                if(!inQuotationMarks){

                                        r.add(str.substring(lastIndex, i + 1).replace("\"", "'"));

                                        lastIndex = i + 1;

                                }

                        }

                        if (currentChar.compareTo(":") == 0

                                        && !inQuotationMarks) {

                                if (lastIndex < i) {

                                        r.add(str.substring(lastIndex, i));

                                }

                                lastIndex = i + 1;

                        }

                }

                if (lastIndex < str.length() - 1) {

                        r.add(str.substring(lastIndex));

                }

                String[] result = new String[r.size()];

                r.toArray(result);

                return result;

        }

        /**

         * Compute the texts to show in the label and store them in LabelClass.

         */

        @SuppressWarnings("unchecked")

        private boolean setupLabel(Feature featu, ILabelClass lc,

                        Cancellable cancel, String[] usedFields, ViewPort viewPort,

                        double dpi, int duplicateMode) {

                String expr = lc.getStringLabelExpression();

                long pt1 = System.currentTimeMillis();

                String[] texts = NO_TEXT;

                List<String> preTexts = new ArrayList<String>();

                try {

                        if (expr != null) {

                                if (expr.equals("")) {

                                        expr = texts[0];

                                }

                                String[] multiexpr = divideExpression(expr);

                                for (int i = 0; i < multiexpr.length; i++) {

                                        expr = multiexpr[i];

                                        Object res = LabelClassUtils.evaluate(expr,

                                                        featu.getEvaluatorData());

                                        if (res != null) {

                                                preTexts.add(res.toString());

                                        } else {

                                                preTexts.add("");

                                        }

                                }

                                texts = new String[preTexts.size()];

                                preTexts.toArray(texts);

                                // parseTime += System.currentTimeMillis()-pt1;

                        }

                        lc.setTexts(texts);

                } catch (Exception e) {

                        logger.warn("While setting up label", e);

                        return false;

                }

                return true;

        }

    private boolean isOverlapping(BufferedImage bi, Geometry lblgeom) {

        for (Iterator iterator = drawnGeometryLabels.iterator(); iterator.hasNext();) {

            Geometry drawnGeometry = (Geometry) iterator.next();

            try {

                if (drawnGeometry.intersects(lblgeom)) {

                    return true;

                }

            } catch (GeometryOperationNotSupportedException | GeometryOperationException e) {

                logger.warn("Can't check overlapping geometry");

            }

        }

        drawnGeometryLabels.add(lblgeom);

        return false;

    }

        private boolean isOnePoint(ViewPort viewPort, Geometry geom) {

                boolean onePoint = false;

                int shapeType = geom.getType();

                if (shapeType != TYPES.POINT && shapeType != TYPES.MULTIPOINT) {

                        Envelope env = geom.getEnvelope();

                        double dist1Pixel = viewPort.getDist1pixel();

                        onePoint = (env.getLength(0) <= dist1Pixel && env.getLength(1) <= dist1Pixel);

                }

                return onePoint;

        }

        public boolean isAllowingOverlap() {

                return allowOverlapping;

        }

        public void setAllowOverlapping(boolean allowOverlapping) {

                this.allowOverlapping = allowOverlapping;

        }

        public IPlacementConstraints getPlacementConstraints() {

                if (placementConstraints != null)

                        return placementConstraints;

                GeometryType gt = null;

                try {

                        gt = layer.getGeometryType();

                        // force 2d for comparison

                        gt = GeometryLocator.getGeometryManager().getGeometryType(

                                        gt.getType(), SUBTYPES.GEOM2D);

                } catch (Exception e) {

                        logger.error("While getting placements constraints.", e);

                        return null;

                }

                if (gt.isTypeOf(TYPES.POINT) || gt.isTypeOf(TYPES.MULTIPOINT)) {

                        return DefaultPointPlacementConstraints;

                } else {

                        if (gt.isTypeOf(TYPES.CURVE) || gt.isTypeOf(TYPES.MULTICURVE)) {

                                return DefaultLinePlacementConstraints;

                        } else {

                                if (gt.isTypeOf(TYPES.SURFACE)

                                                || gt.isTypeOf(TYPES.MULTISURFACE)) {

                                        return DefaultPolygonPlacementConstraints;

                                } else {

                                        if (gt.isTypeOf(TYPES.AGGREGATE)

                                                        || gt.isTypeOf(TYPES.GEOMETRY)) {

                                                DefaultMultiShapePlacementConstratints

                                                                .setPointConstraints(DefaultPointPlacementConstraints);

                                                DefaultMultiShapePlacementConstratints

                                                                .setLineConstraints(DefaultLinePlacementConstraints);

                                                DefaultMultiShapePlacementConstratints

                                                                .setPolygonConstraints(DefaultPolygonPlacementConstraints);

                                                return DefaultMultiShapePlacementConstratints;

                                        }

                                }

                        }

                }

                return null;

        }

        public void setPlacementConstraints(IPlacementConstraints constraints) {

                this.placementConstraints = constraints;

        }

        public IZoomConstraints getZoomConstraints() {

                return zoomConstraints;

        }

        public void setZoomConstraints(IZoomConstraints constraints) {

                this.zoomConstraints = constraints;

        }

        public void print(Graphics2D g, double scale, ViewPort viewPort,

                        Cancellable cancel, PrintAttributes properties)

                        throws ReadException {

                double dpi = 100;

                int pq = properties.getPrintQuality();

                if (pq == PrintAttributes.PRINT_QUALITY_NORMAL) {

                        dpi = 300;

                } else if (pq == PrintAttributes.PRINT_QUALITY_HIGH) {

                        dpi = 600;

                } else if (pq == PrintAttributes.PRINT_QUALITY_DRAFT) {

                        dpi = 72;

                }

                viewPort.setOffset(new Point2D.Double(0, 0));

                /* signal printing output */

                printMode = true;

                draw(null, g, scale, viewPort, cancel, dpi);

        }

        public String[] getUsedFields() {

                /*

                 * TODO Solve the problem with the [ and ]. Currently SQLJEP evaluator

                 * cannot tell which fields are being used. Options: allow [] and remove

                 * them or maybe while parsing the SQLJEP evaluator can inform with

                 * events like "I have found a field"

                 */

                FeatureAttributeDescriptor[] atts = null;

                try {

                        atts = layer.getFeatureStore().getDefaultFeatureType()

                                        .getAttributeDescriptors();

                } catch (DataException e) {

                        logger.error("While getting atributes.", e);

                }

                int n = atts.length;

                String[] resp = new String[n];

                for (int i = 0; i < n; i++) {

                        resp[i] = atts[i].getName();

                }

                return resp;

        }

        public boolean shouldDrawLabels(double scale) {

                double minScaleView = -1;

                double maxScaleView = -1;

                if (zoomConstraints != null) {

                        minScaleView = zoomConstraints.getMinScale();

                        maxScaleView = zoomConstraints.getMaxScale();

                }

                if (minScaleView == -1 && maxScaleView == -1) {

                        // parameters not set, so the layer decides.

                        return layer.isWithinScale(scale);

                }

                if (minScaleView >= scale) {

                        return (maxScaleView != -1) ? maxScaleView <= scale : true;

                }

                return false;

        }

        public void setUnit(int unitIndex) {

                unit = unitIndex;

        }

        public int getUnit() {

                return unit;

        }

        public int getReferenceSystem() {

                return referenceSystem;

        }

        public void setReferenceSystem(int referenceSystem) {

                this.referenceSystem = referenceSystem;

        }

        public static void registerPersistent() {

                PersistenceManager manager = ToolsLocator.getPersistenceManager();

                if (manager.getDefinition(GENERAL_LABEL_STRATEGY_PERSISTENCE_NAME) == null) {

                        DynStruct definition = manager.addDefinition(

                                        GeneralLabelingStrategy.class,

                                        GENERAL_LABEL_STRATEGY_PERSISTENCE_NAME,

                                        GENERAL_LABEL_STRATEGY_PERSISTENCE_NAME

                                                        + " Persistence definition", null, null);

                        definition.addDynFieldObject("labelingMethod")

                                        .setClassOfValue(ILabelingMethod.class).setMandatory(true);

                        definition.addDynFieldObject("placementConstraints")

                                        .setClassOfValue(IPlacementConstraints.class)

                                        .setMandatory(false);

                        definition.addDynFieldObject("zoomConstraints")

                                        .setClassOfValue(IZoomConstraints.class)

                                        .setMandatory(false);

                        definition.addDynFieldBoolean("allowOverlapping")

                                        .setMandatory(true);

                        definition.addDynFieldInt("unit").setMandatory(true);

                        definition.addDynFieldInt("referenceSystem").setMandatory(true);

                }

        }

        public void loadFromState(PersistentState state)

                        throws PersistenceException {

                method = (ILabelingMethod) state.get("labelingMethod");

                if (state.hasValue("placementConstraints")) {

                        placementConstraints = (IPlacementConstraints) state

                                        .get("placementConstraints");

                }

                if (state.hasValue("zoomConstraints")) {

                        zoomConstraints = (IZoomConstraints) state.get("zoomConstraints");

                }

                this.allowOverlapping = state.getBoolean("allowOverlapping");

                this.unit = state.getInt("unit");

                this.referenceSystem = state.getInt("referenceSystem");

        }

        public void saveToState(PersistentState state) throws PersistenceException {

                state.set("labelingMethod", method);

                if (placementConstraints != null) {

                        state.set("placementConstraints", placementConstraints);

                }

                if (zoomConstraints != null) {

                        state.set("zoomConstraints", zoomConstraints);

                }

                state.set("allowOverlapping", allowOverlapping);

                state.set("unit", unit);

                state.set("referenceSystem", referenceSystem);

        }

        public double toCartographicSize(ViewPort vp, double dpi, Geometry geom) {

                /*

                 * This method is not used but we must implement CartographicSupport

                 */

                return 0;

        }

        public void setCartographicSize(double cartographicSize, Geometry geom) {

                /*

                 * This method is not used but we must implement CartographicSupport

                 */

        }

        public double getCartographicSize(ViewPort vp, double dpi, Geometry geom) {

                /*

                 * This method is not used but we must implement CartographicSupport

                 */

                return 0;

        }

        public Object clone() throws CloneNotSupportedException {

                return LabelClassUtils.clone(this);

        }

}