/* ********************************************************************** * $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/plugin/WebImagePlugIn.java,v $ * $Revision: 1.4.2.2 $  * $Date: 2006/01/13 21:04:22 $  * $Author: dietrick $ * * Code provided by Raj Singh from Syncline, rs@syncline.com * Updates provided by Holger Kohler, Holger.Kohler@dsto.defence.gov.au * ********************************************************************* */package com.bbn.openmap.plugin;import java.awt.Component;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.ByteArrayOutputStream;import java.io.InputStream;import java.util.Iterator;import java.util.Vector;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JOptionPane;import javax.swing.JPanel;import com.bbn.openmap.Layer;import com.bbn.openmap.image.ImageServerConstants;import com.bbn.openmap.omGraphics.OMGraphicList;import com.bbn.openmap.omGraphics.OMRaster;import com.bbn.openmap.proj.Projection;import com.bbn.openmap.util.Debug;import com.bbn.openmap.util.PropUtils;/** * This class asks for an image from a web server. How it asks for that image is * what is abstract. */public abstract class WebImagePlugIn extends AbstractPlugIn implements        ImageServerConstants {    /** For convenience. */    protected PlugInLayer layer = null;    /** The last projection object received. */    protected Projection currentProjection = null;    /**     * Create the query to be sent to the server, based on current settings.     */    public abstract String createQueryString(Projection p);    /**     * The getRectangle call is the main call into the PlugIn module. The module     * is expected to fill the graphics list with objects that are within the     * screen parameters passed.     *      * @param p projection of the screen, holding scale, center coords, height,     *        width.     */    public OMGraphicList getRectangle(Projection p) {        OMGraphicList list = new OMGraphicList();        currentProjection = p;        String urlString = createQueryString(p);        if (Debug.debugging("plugin")) {            Debug.output("WebImagePlugIn.getRectangle() with \"" + urlString                    + "\"");        }        if (urlString == null) {            return list;        }        java.net.URL url = null;        try {            url = new java.net.URL(urlString);            java.net.HttpURLConnection urlc = (java.net.HttpURLConnection) url.openConnection();            if (Debug.debugging("plugin")) {                Debug.output("url content type: " + urlc.getContentType());            }            if (urlc == null || urlc.getContentType() == null) {                if (layer != null) {                    layer.fireRequestMessage(getName()                            + ": unable to connect to " + getServerName());                } else {                    Debug.error(getName() + ": unable to connect to "                            + getServerName());                }                return list;            }            // text            if (urlc.getContentType().startsWith("text")) {                java.io.BufferedReader bin = new java.io.BufferedReader(new java.io.InputStreamReader(urlc.getInputStream()));                String st;                String message = "";                while ((st = bin.readLine()) != null) {                    message += st;                }                // Debug.error(message);                // How about we toss the message out to the user                // instead?                if (layer != null) {                    layer.fireRequestMessage(message);                }                // image            } else if (urlc.getContentType().startsWith("image")) {                // disconnect and reconnect in ImageIcon is very                // expensive                // urlc.disconnect();                // ImageIcon ii = new ImageIcon(url);                // this doesn't work always                // ImageIcon ii = new ImageIcon((Image)                // urlc.getContent());                // the best way, no reconnect, but can be an                // additional 'in memory' image                InputStream in = urlc.getInputStream();                // ------- Testing without this                ByteArrayOutputStream out = new ByteArrayOutputStream();                int buflen = 2048; // 2k blocks                byte buf[] = new byte[buflen];                int len = -1;                while ((len = in.read(buf, 0, buflen)) != -1) {                    out.write(buf, 0, len);                }                out.flush();                out.close();                ImageIcon ii = new ImageIcon(out.toByteArray());                // -------- To here, replaced by two lines below...                // DFD - I've seen problems with these lines below handling PNG                // images, and with some servers with some coverages, like there                // was something in the image under certain conditions that made                // it tough to view. So while it might be more memory efficient                // to do the code below, we'll error on the side of correctness                // until we figure out what's going on.                // FileCacheImageInputStream fciis = new                // FileCacheImageInputStream(in, null);                // BufferedImage ii = ImageIO.read(fciis);                OMRaster image = new OMRaster((int) 0, (int) 0, ii);                list.add(image);            } // end if image        } catch (java.net.MalformedURLException murle) {            Debug.error("WebImagePlugIn: URL \"" + urlString                    + "\" is malformed.");        } catch (java.io.IOException ioe) {            JOptionPane.showMessageDialog(null,                    getName() + ":\n\n   Couldn't connect to "                            + getServerName(),                    "Connection Problem",                    JOptionPane.INFORMATION_MESSAGE);        }        list.generate(p);        return list;    } // end getRectangle    public abstract String getServerName();    public java.awt.Component getGUI() {        JPanel panel = new JPanel(new GridLayout(0, 1));        JButton parameterButton = new JButton("Adjust Parameters");        parameterButton.setActionCommand(Layer.DisplayPropertiesCmd);        if (layer != null) {            parameterButton.addActionListener(layer);        }        JButton viewQueryButton = new JButton("View Current Query");        viewQueryButton.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent ae) {                if (layer != null) {                    String query = createQueryString(currentProjection);                    Vector queryStrings = PropUtils.parseMarkers(query, "&");                    StringBuffer updatedQuery = new StringBuffer();                    Iterator it = queryStrings.iterator();                    if (it.hasNext()) {                        updatedQuery.append((String) it.next());                    }                    while (it.hasNext()) {                        updatedQuery.append("&\n   ");                        updatedQuery.append((String) it.next());                    }                    JOptionPane.showMessageDialog(null,                            updatedQuery.toString(),                            "Current Query for " + getName(),                            JOptionPane.INFORMATION_MESSAGE);                }            }        });        redrawButton.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent ae) {                if (layer != null) {                    layer.doPrepare();                }            }        });        redrawButton.setEnabled(layer != null);        panel.add(parameterButton);        panel.add(viewQueryButton);        panel.add(redrawButton);        return panel;    }    protected JButton redrawButton = new JButton("Query Server");    protected JOptionPane messageWindow = new JOptionPane();    /**     * Set the component that this PlugIn uses as a grip to the map.     */    public void setComponent(Component comp) {        super.setComponent(comp);        if (comp instanceof PlugInLayer) {            layer = (PlugInLayer) comp;        } else {            layer = null;        }        redrawButton.setEnabled(layer != null);    }} // end WMSPlugin