multishapelayer.java

openmap java写的开源数字地图程序. 用applet实现,可以像google map 那样放大缩小地图.

// **********************************************************************
// 
// <copyright>
// 
//  BBN Technologies
//  10 Moulton Street
//  Cambridge, MA 02138
//  [phone]
// 
//  Copyright (C) BBNT Solutions LLC. All rights reserved.
// 
// </copyright>
// **********************************************************************
// 
// $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/layer/shape/MultiShapeLayer.java,v $
// $RCSfile: MultiShapeLayer.java,v $
// $Revision: 1.7.2.5 $
// $Date: 2005/08/11 21:03:25 $
// $Author: dietrick $
// 
// **********************************************************************

package com.bbn.openmap.layer.shape;

import java.awt.*;
import java.util.*;
import javax.swing.*;

import com.bbn.openmap.*;
import com.bbn.openmap.io.FormatException;
import com.bbn.openmap.omGraphics.*;
import com.bbn.openmap.proj.Projection;
import com.bbn.openmap.util.DataBounds;
import com.bbn.openmap.util.Debug;
import com.bbn.openmap.util.PropUtils;

/**
 * An OpenMap Layer that displays multiple shape files. Note that the
 * ESRIRecords have been updated so that the OMGraphics that get
 * created from them are loaded with an Integer object that notes the
 * number of the record as it was read from the .shp file. This lets
 * you align the object with the correct attribute data in the .dbf
 * file.
 * 
 * <p>
 * <code><pre>
 * 
 *  ############################
 *  # Properties for a multiple shape file layer
 *  shapeLayer.class=com.bbn.openmap.layer.shape.MultiShapeLayer
 *  shapeLayer.prettyName=Name_for_Menu
 *  shapeLayer.shapeFileList=marker_name1 marker_name2 ...
 * 
 *  shapeLayer.marker_name1.shapeFile=&amp;ltpath to shapefile (.shp)&amp;gt
 *  shapeLayer.marker_name1.spatialIndex=&amp;ltpath to generated spatial index file (.ssx)&amp;gt
 *  shapeLayer.marker_name1.lineColor=ff000000
 *  shapeLayer.marker_name1.fillColor=ff000000
 *  # plus any other properties used by the DrawingAttributes object.
 *  shapeLayer.marker_name1.pointImageURL=&amp;ltURL for image to use for point objects&amp;gt
 *  shapeLayer.marker_name1.enabled=true/false
 * 
 *  shapeLayer.marker_name2.shapeFile=&amp;ltpath to shapefile (.shp)&amp;gt
 *  shapeLayer.marker_name2.spatialIndex=&amp;ltpath to generated spatial index file (.ssx)&amp;gt
 *  shapeLayer.marker_name2.lineColor=ff000000
 *  shapeLayer.marker_name2.fillColor=ff000000
 *  # plus any other properties used by the DrawingAttributes object.
 *  shapeLayer.marker_name2.pointImageURL=&amp;ltURL for image to use for point objects&amp;gt
 *  shapeLayer.marker_name2.enabled=true/false
 *  ############################
 *  
 * </pre></code>
 * 
 * @version $Revision: 1.7.2.5 $ $Date: 2005/08/11 21:03:25 $
 * @see SpatialIndex
 */
public class MultiShapeLayer extends ShapeLayer {

    public final static String ShapeFileListProperty = "shapeFileList";
    protected Collection spatialIndexes;

    /**
     * Initializes an empty shape layer.
     */
    public MultiShapeLayer() {}

    public void setSpatialIndexes(Collection siv) {
        spatialIndexes = siv;
    }

    public Collection getSpatialIndexes() {
        return spatialIndexes;
    }

    /**
     * This method gets called from setProperties.
     * 
     * @param prefix This prefix has already been scoped, which
     *        means it is an empty string if setProperties was called
     *        with a null prefix, or it's a String ending with a
     *        period if it was defined with characters.
     * @param props Properties containing information about files and
     *        the layer.
     */
    protected void setFileProperties(String prefix, Properties props) {
        setSpatialIndexes(prefix, props);
    }

    /**
     * This method gets called from setFileProperties.
     * 
     * @param prefix This prefix has already been scoped, which means
     *        it is an empty string if setProperties was called with a
     *        null prefix, or it's a String ending with a period if it
     *        was defined with characters.
     * @param p Properties containing information about files and
     *        the layer.
     */
    protected void setSpatialIndexes(String prefix, Properties p) {

        String listValue = p.getProperty(prefix + ShapeFileListProperty);

        if (Debug.debugging("shape")) {
            Debug.output(getName() + "| list = \"" + listValue + "\"");
        }

        if (listValue == null) {
            Debug.error("No property \"" + prefix + ShapeFileListProperty
                    + "\" found in application properties.");
            return;
        }

        // Divide up the names ...
        StringTokenizer tokens = new StringTokenizer(listValue, " ");
        Collection shapeFiles = new Vector();
        while (tokens.hasMoreTokens()) {
            shapeFiles.add(tokens.nextToken());
        }

        spatialIndexes = new Vector(shapeFiles.size());
        Iterator list = shapeFiles.iterator();

        while (list.hasNext()) {
            String listName = (String) list.next();
            SpatialIndexHandler sih = new SpatialIndexHandler(prefix + listName, p);
            spatialIndexes.add(sih);

            if (Debug.debugging("shape")) {
                Debug.output("MultiShapeLayer adding: " + sih);
            }
        }
    }

    /**
     * PropertyConsumer method.
     */
    public Properties getProperties(Properties props) {
        props = super.getProperties(props);

        String prefix = PropUtils.getScopedPropertyPrefix(this);

        props.remove(prefix + shapeFileProperty);
        props.remove(prefix + spatialIndexProperty);
        props.remove(prefix + pointImageURLProperty);

        Iterator sis = spatialIndexes.iterator();
        StringBuffer list = new StringBuffer();
        while (sis.hasNext()) {
            SpatialIndexHandler sih = (SpatialIndexHandler) sis.next();
            sih.getProperties(props);
            String pp = sih.getPropertyPrefix();
            // Can't be null, if they are part of this layer...
            pp = pp.substring(pp.lastIndexOf('.') + 1);
            list.append(" " + pp);
        }

        props.put(prefix + ShapeFileListProperty, list.toString());
        return props;
    }

    /**
     * Method to fill in a Properties object with values reflecting
     * the properties able to be set on this PropertyConsumer. The key
     * for each property should be the raw property name (without a
     * prefix) with a value that is a String that describes what the
     * property key represents, along with any other information about
     * the property that would be helpful (range, default value,
     * etc.).
     * 
     * @param props a Properties object to load the PropertyConsumer
     *        properties into. If getList equals null, then a new
     *        Properties object should be created.
     * @return Properties object containing PropertyConsumer property
     *         values. If getList was not null, this should equal
     *         getList. Otherwise, it should be the Properties object
     *         created by the PropertyConsumer.
     */
    public Properties getPropertyInfo(Properties props) {
        props = super.getPropertyInfo(props);
        props.remove(shapeFileProperty);
        props.remove(spatialIndexProperty);
        props.remove(pointImageURLProperty);
        props.remove(shapeFileProperty + ScopedEditorProperty);
        props.remove(spatialIndexProperty + ScopedEditorProperty);
        props.remove(pointImageURLProperty + ScopedEditorProperty);

        Iterator sis = spatialIndexes.iterator();
        while (sis.hasNext()) {
            ((SpatialIndexHandler) sis.next()).getPropertyInfo(props);
        }

        props.put(ShapeFileListProperty,
                "List of marker names for SpatialIndexHandlers");

        return props;
    }

    /**
     * Creates an OMGraphicList containing graphics from all
     * SpatialIndex objects and shapefiles.
     * 
     * @return OMGraphicList containing an OMGraphicList containing
     *         shapes from a particular shape file.
     */
    public synchronized OMGraphicList prepare() {

        if (spatialIndexes == null || spatialIndexes.size() == 0) {
            Debug.message("shape", "MultiShapeLayer: spatialIndexes is empty!");
            return new OMGraphicList();
        }

        Projection projection = getProjection();

        if (projection == null) {
            // This can happen if the layer is part of a
            // ScaleFilterLayer, and the redraw button for this layer
            // is pressed before the ScaleFilterLayer gives it a
            // projection (which only happens if the layer is the
            // active one).
            Debug.message("basic", "MultiShapeLayer|" + getName()
                    + ": prepare called with null projection");
            return new OMGraphicList();
        }

        LatLonPoint ul = projection.getUpperLeft();
        LatLonPoint lr = projection.getLowerRight();
        float ulLat = ul.getLatitude();
        float ulLon = ul.getLongitude();
        float lrLat = lr.getLatitude();
        float lrLon = lr.getLongitude();

        OMGraphicList masterList = new OMGraphicList();
        OMGraphicList list = null;
        SpatialIndexHandler sih;
        Iterator sii;

        // check for dateline anomaly on the screen. we check for
        // ulLon >= lrLon, but we need to be careful of the check for
        // equality because of floating point arguments...
        if ((ulLon > lrLon)
                || MoreMath.approximately_equal(ulLon, lrLon, .001f)) {
            if (Debug.debugging("shape")) {
                Debug.output("MultiShapeLayer.computeGraphics(): Dateline is on screen");
            }

            double ymin = (double) Math.min(ulLat, lrLat);
            double ymax = (double) Math.max(ulLat, lrLat);

            sii = spatialIndexes.iterator();
            while (sii.hasNext()) {
                sih = (SpatialIndexHandler) sii.next();
                if (!sih.enabled)
                    continue;

                try {

                    list = sih.getGraphics(ulLon, ymin, 180.0d, ymax, list);
                    list = sih.getGraphics(-180.0d, ymin, lrLon, ymax, list);
                } catch (java.io.IOException ex) {
                    ex.printStackTrace();
                } catch (FormatException fe) {
                    fe.printStackTrace();
                }
                masterList.add(list);
            }
        } else {

            double xmin = (double) Math.min(ulLon, lrLon);
            double xmax = (double) Math.max(ulLon, lrLon);
            double ymin = (double) Math.min(ulLat, lrLat);
            double ymax = (double) Math.max(ulLat, lrLat);

            sii = spatialIndexes.iterator();
            while (sii.hasNext()) {
                sih = (SpatialIndexHandler) sii.next();

                if (!sih.enabled)
                    continue;

                if (Debug.debugging("shape")) {
                    Debug.output("  Getting graphics from " + sih.prettyName
                            + " spatial index");
                }
                try {
                    list = sih.getGraphics(xmin, ymin, xmax, ymax, list);
                } catch (java.io.IOException ex) {
                    ex.printStackTrace();
                } catch (FormatException fe) {
                    fe.printStackTrace();
                }
                masterList.add(list);
            }
        }

        if (masterList != null) {
            masterList.generate(projection, true);//all new graphics
        }
        return masterList;
    }

    public Component getGUI() {
        if (box == null) {

            box = new JPanel();
            JTabbedPane tabs = new JTabbedPane();

            box.setLayout(new BoxLayout(box, BoxLayout.Y_AXIS));
            box.setAlignmentX(Component.LEFT_ALIGNMENT);

            Iterator sii = spatialIndexes.iterator();
            while (sii.hasNext()) {
                SpatialIndexHandler sih = (SpatialIndexHandler) sii.next();
                JPanel stuff = (JPanel) sih.getGUI();
                if (stuff != null) {
                    tabs.addTab(sih.getPrettyName(), stuff);
                }
            }

            box.add(tabs);

            JPanel pal2 = new JPanel();
            JButton redraw = new JButton("Redraw Layer");
            redraw.setActionCommand(RedrawCmd);
            redraw.addActionListener(this);
            pal2.add(redraw);
            box.add(pal2);
        }
        return box;
    }

    /**
     * DataBoundsInformer interface.
     */
    public DataBounds getDataBounds() {

        ESRIBoundingBox bounds = new ESRIBoundingBox();

        for (Iterator sii = spatialIndexes.iterator(); sii.hasNext();) {
            SpatialIndexHandler sih = (SpatialIndexHandler) sii.next();
            if (sih != null && sih.spatialIndex != null) {
                ESRIBoundingBox boundingBox = sih.spatialIndex.getBounds();
                if (bounds != null) {
                    bounds.addBounds(boundingBox);
                }
            }
        }

        return new DataBounds(bounds.min.x, bounds.min.y, bounds.max.x, bounds.max.y);
    }

}