/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
* This code is licensed under the GPL 2.0 license, available at the root
* application directory.
*/
package org.geoserver.web.wicket;
import java.io.Serializable;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.wicket.AttributeModifier;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.behavior.IBehavior;
import org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.basic.MultiLineLabel;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.FormComponentPanel;
import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.model.PropertyModel;
import org.geotools.referencing.CRS;
import org.geotools.util.logging.Logging;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
/**
* A form component for a {@link CoordinateReferenceSystem} object.
* <p>
* This panel provides the following functionality/information:
* <ul>
* <li>The SRS (epsg code) of the CRS
* <li>View the full WKT of the CRS.
* <li>A mechanism to guess the SRS (epsg code) from the CRS
* <li>A lookup for browsing for a particular CRS
* </ul>
* </p>
* @author Justin Deoliveira, OpenGeo
*/
@SuppressWarnings("serial")
public class CRSPanel extends FormComponentPanel {
private static Logger LOGGER = Logging.getLogger(CRSPanel.class);
private static final long serialVersionUID = -6677103383336166008L;
private static IBehavior READ_ONLY = new AttributeModifier("readonly", true, new Model("readonly"));
/** pop-up window for WKT and SRS list */
ModalWindow popupWindow;
/** srs/epsg code text field */
TextField srsTextField;
/** find link */
AjaxLink findLink;
/** wkt label */
Label wktLabel;
/** the wkt link that contains the wkt label **/
GeoServerAjaxFormLink wktLink;
/**
* Constructs the CRS panel.
* <p>
* This constructor should be used if the panel is to inherit from a parent model
* (ie a CompoundPropertyModel). If no such model is available the CRS will be left
* uninitialized. To avoid inheriting from a parent model the constructor {@link #CRSPanel(String, IModel)}
* should be used, specifying explicitly an uninitialized model.
*</p>
* @param id The component id.
*/
public CRSPanel(String id) {
super(id);
initComponents();
}
/**
* Constructs the CRS panel with an explicit model.
*
* @param id The component id.
* @param model The model, usually a {@link PropertyModel}.
*/
public CRSPanel(String id, IModel model) {
super(id, model);
initComponents();
}
/**
* Constructs the CRS panel specifying the underlying CRS explicitly.
* <p>
* When this constructor is used the {@link #getCRS()} method should be used
* after the form is submitted to retrieve the final value of the CRS.
* </p>
* @param id The component id.
* @param crs The underlying CRS object.
*/
public CRSPanel(String id, CoordinateReferenceSystem crs ) {
//JD: while the CoordinateReferenceSystem interface does not implement Serializable
// all the CRS objects we use do, hence the cast
super(id, new Model((Serializable) crs));
initComponents();
setConvertedInput(crs);
}
/*
* helper for internally creating the panel.
*/
void initComponents() {
popupWindow = new ModalWindow("popup");
add( popupWindow );
srsTextField = new TextField( "srs", new Model() );
add( srsTextField );
srsTextField.setOutputMarkupId( true );
srsTextField.add(new AjaxFormComponentUpdatingBehavior("onblur") {
@Override
protected void onUpdate(AjaxRequestTarget target) {
convertInput();
CoordinateReferenceSystem crs = (CoordinateReferenceSystem) getConvertedInput();
if(crs != null) {
setModelObject(crs);
wktLabel.setModelObject(crs.getName().toString());
wktLink.setEnabled(true);
} else {
wktLabel.setModelObject(null);
wktLink.setEnabled(false);
}
target.addComponent(wktLink);
}
});
findLink = new AjaxLink( "find" ) {
@Override
public void onClick(AjaxRequestTarget target) {
popupWindow.setContent(srsListPanel());
popupWindow.setTitle(new ParamResourceModel("selectSRS", CRSPanel.this));
popupWindow.show(target);
}
};
add(findLink);
wktLink = new GeoServerAjaxFormLink("wkt") {
@Override
public void onClick(AjaxRequestTarget target, Form form) {
popupWindow.setInitialHeight( 375 );
popupWindow.setInitialWidth( 525 );
popupWindow.setContent(new WKTPanel( popupWindow.getContentId(), getCRS()));
CoordinateReferenceSystem crs = (CoordinateReferenceSystem) CRSPanel.this.getModelObject();
if(crs != null)
popupWindow.setTitle(crs.getName().toString());
popupWindow.show(target);
}
};
wktLink.setEnabled(getModelObject() != null);
add(wktLink);
wktLabel = new Label( "wktLabel", new Model());
wktLink.add( wktLabel );
wktLabel.setOutputMarkupId( true );
}
@Override
protected void onBeforeRender() {
CoordinateReferenceSystem crs = (CoordinateReferenceSystem) getModelObject();
if ( crs != null ) {
srsTextField.setModelObject( toSRS(crs) );
wktLabel.setModelObject( crs.getName().toString() );
} else {
wktLabel.setModelObject(null);
wktLink.setEnabled(false);
}
super.onBeforeRender();
}
@Override
protected void convertInput() {
String srs = srsTextField.getInput();
CoordinateReferenceSystem crs = null;
if ( srs != null && !"".equals(srs)) {
if ( "UNKNOWN".equals( srs ) ) {
//leave underlying crs unchanged
if ( getModelObject() instanceof CoordinateReferenceSystem ) {
setConvertedInput(getModelObject());
}
return;
}
crs = fromSRS( srs );
}
setConvertedInput( crs );
}
/**
* Sets the panel to be read only.
*/
public CRSPanel setReadOnly( boolean readOnly ) {
if(readOnly)
srsTextField.add(READ_ONLY);
else
srsTextField.remove(READ_ONLY);
findLink.setVisible( !readOnly );
return this;
}
/**
* Returns the underlying CRS for the panel.
* <p>
* This method is convenience for:
* <pre>
* (CoordinateReferenceSystem) this.getModelObject();
* </pre>
* </p>
*/
public CoordinateReferenceSystem getCRS() {
convertInput();
return (CoordinateReferenceSystem) getConvertedInput();
}
/*
* Goes from CRS to SRS.
*/
String toSRS( CoordinateReferenceSystem crs ) {
try {
Integer epsgCode = CRS.lookupEpsgCode(crs, false);
return epsgCode != null ? "EPSG:" + epsgCode : "UNKNOWN";
}
catch (Exception e) {
LOGGER.log(Level.WARNING, "Could not succesffully lookup an EPSG code", e);
return null;
}
}
/*
* Goes from SRS to CRS.
*/
CoordinateReferenceSystem fromSRS( String srs ) {
try {
return CRS.decode( srs );
}
catch (Exception e) {
LOGGER.log(Level.WARNING, "Unknown EPSG code " + srs, e);
return null;
}
}
/*
* Builds the srs list panel component.
*/
@SuppressWarnings("serial")
SRSListPanel srsListPanel() {
SRSListPanel srsList = new SRSListPanel(popupWindow.getContentId()) {
@Override
protected void onCodeClicked(AjaxRequestTarget target, String epsgCode) {
popupWindow.close(target);
String srs = "EPSG:" + epsgCode ;
srsTextField.setModelObject( srs );
target.addComponent( srsTextField );
CoordinateReferenceSystem crs = fromSRS( srs );
wktLabel.setModelObject( crs.getName().toString() );
wktLink.setEnabled(true);
target.addComponent( wktLink );
}
};
srsList.setCompactMode(true);
return srsList;
}
/*
* Panel for displaying the well known text for a CRS.
*/
public static class WKTPanel extends Panel {
public WKTPanel(String id, CoordinateReferenceSystem crs) {
super(id);
MultiLineLabel wktLabel = new MultiLineLabel("wkt");
add( wktLabel );
if ( crs != null ) {
wktLabel.setModel( new Model( crs.toWKT() ) );
}
}
}
}