Hi!
I feel I have finally made a break through in understanding some of the
uDig code I have been writing.
This is what I think each bit of my code for creating a new shapefile is
effectively doing, when equated to databases terminology:
// LIKE: CREATING A NEW DATABASE
IndexedShapefileDataStoreFactory fac = new
IndexedShapefileDataStoreFactory();
String sShapeFile = file2.getAbsolutePath();
ShapefileDataStore ds = (ShapefileDataStore) fac.createDataStore(new
URL("file://"+sShapeFile));
// LIKE: CREATING A DATABASE TABLE SCHEMA
// FIELD NAME = "the_icon"
// DATAYPE FOR FIELD = Point.class
AttributeType geomAttr =
AttributeTypeFactory.newAttributeType("the_icon", Point.class);
AttributeType linkAttr =
AttributeTypeFactory.newAttributeType("the_link", String.class);
// LIKE: CREATING THE NEW TABLE
// TABLE SCHEMA, TABLE NAME
FeatureType featureType = FeatureTypeBuilder.newFeatureType(new
AttributeType[] {geomAttr, linkAttr}, sBaseLayerName+"-"+sFileName);
// LIKE: CREATING THE DATA FOR A NEW RECORD IN THE TABLE
GeometryFactory geomFactory = new GeometryFactory();
Coordinate coord = new Coordinate(event.x, event.y);
Point point = geomFactory.createPoint(coord);
String sLink = "comp_test";
// LIKE: ADDING THE A RECORD TO THE TABLE
Feature newRecord = featureType.create(new Object[] {point, sLink},
"the_recordID");
// LIKE: ADDING THE TABLE TO THE DATABASE
ds.createSchema( featureType);
Question 1: Can anyone confirm that I have understood this right
process?
Question 2: I have declared my feature type schema to have a second
attribute to hold a string.
But at the time I create the Feature, I don't know the value of this
field yet.
I assume I can programmatically add this data later? (From Vitali's
email I was a little concerned).
Question 3: Is adding a new point to an existing layer (of the type
described above), just involve create a new record in the table? In
other words doing this line again with an existing FeatureType for the
Layer:
"Feature newRecord = featureType.create(new Object[] {point, sLink},
"the_recordID");"
Thanks
Michelle
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jesse
Eichar
Sent: 16 March 2006 18:10
To: User-friendly Desktop Internet GIS
Subject: Re: [udig-devel] Shapefiles
On 16-Mar-06, at 4:59 AM, M.S.Bachler wrote:
> Hi!
>
> I know can get the x,y which is great. Thanks.
>
> I have had a first attempt at creating a shapefile and adding a new
> layer connecting to the shape file, for the first time you drop a
> specific icon on a map (subsequent times you add it to an existing
> layer
> - which is the next step).
>
> I have pieced together code from various emails but still think I have
> not really got a complete picture of what I am doing. The code I have,
> creates a shape file (I can see the files are there), it also adds a
> layer to the map (I can see the layer in the list), but it has an
> error
> - 'Connection to Resource Failed'.
> I am also not sure if the Point code is right?
>
> Here is my code: Any thoughts anyone about what I am doing wrong? (or
> how I could simplify it?)
>
> try {
> IndexedShapefileDataStoreFactory fac = new
> IndexedShapefileDataStoreFactory();
> File file2 = new
> File("Ecosensus"+EcosensusPlugin.sFS
> +"Shapefiles"+EcosensusPlugin.sFS+sF
> ileName+".shp");
> String sShapeFile = file2.getAbsolutePath();
> ShapefileDataStore ds = (ShapefileDataStore)
fac.createDataStore(new
> URL("file://"+sShapeFile));
> try {
> AttributeType geomAttr =
> AttributeTypeFactory.newAttributeType("the_geom", Point.class);
> FeatureType featureType =
FeatureTypeBuilder.newFeatureType(new
> AttributeType[] {geomAttr}, "icon");
>
> GeometryFactory geomFactory = new GeometryFactory();
> Coordinate coord = new Coordinate(event.x, event.y);
> Point point = geomFactory.createPoint(coord);
> Feature theIcon = featureType.create(new Object[]
> {point}, "myicon");
>
> ds.createSchema( featureType );
>
> List<IService> services =
> CatalogPlugin.getDefault().getServiceFactory().acquire(new
> URL("file://"+sShapeFile));
> IService service = services.get(0);
>
> List resources = service.members(monitor);
> IGeoResource resource = (IGeoResource)resources.get(0);
>
I think the problem is here. the acquire method is tricky. It
creates a service and georesource but does not necessarily add it to
the catalog. Once you have the service make sure you add it to the
catalog:
CatalogPlugin.getDefault().getLocalCatalog().add(service);
> System.out.println("resource type =
> "+resource.getClass().getName());
>
>
> Layer newLayer = factory.createLayer(resource);
> newLayer.setName(sFileName);
> map.sendCommandASync( (new AddLayerCommand(newLayer)) );
>
> DrawCommandFactory factory2 =
DrawCommandFactory.getInstance();
> DrawFeatureCommand cmd =
> factory2.createDrawFeatureCommand(theIcon, crs);
> map.sendCommandASync(cmd);
>
>
> } catch (IllegalAttributeException e) {
> System.out.println("IllegalAttributeException");
> e.printStackTrace();
> } catch(SchemaException se) {
> System.out.println("SchemaException");
> se.printStackTrace();
> }
>
> } catch (IOException e) {
> e.printStackTrace();
> }
>
> Michelle
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Jesse
> Eichar
> Sent: 14 March 2006 20:30
> To: User-friendly Desktop Internet GIS
> Subject: Re: [udig-devel] Shapefiles
>
>
> Here's the interface (I added some comments today as well :P):
>
> /**
> *
> * Defines the behaviour when a drag and drop event occurs. The
> extension declaration combined with the accepts method
> * determines whether the Action will be ran for a given drag/drop
> event.
> *
> * @author jdeolive
> * @since 1.0.0
> */
> public abstract class IDropAction {
>
> public static final String XPID =
> "net.refractions.udig.ui.dropAction"; //$NON-NLS-1$
>
> /** the extension info **/
> IConfigurationElement element;
>
> private Object destination;
>
> private Object data;
>
> private DropTargetEvent event;
>
> private int location;
>
> /**
> * Returns the Configuration element that definates the action in
> the extension declaration.
> *
> * @return the Configuration element that definates the action in
> the extension declaration.
> */
> public IConfigurationElement getElement() {
> return element;
> }
>
> /**
> * Returns the name of the action.
> *
> * @return Returns the name of the action.
> */
> public String getName() {
> if (element == null)
> return ""; //$NON-NLS-1$
> return element.getAttribute("name"); //$NON-NLS-1$
> }
>
> /**
> * Called if the action seems to be a good candidate for handling
> the drop event.
> *
> * @return true if the action this it should handle the drop
> event.
> */
> public abstract boolean accept();
>
> /**
> * Performs the drop action.
> *
> * @param monitor a progress monitor for showing the progress of
> the current event.
> */
> public abstract void perform(IProgressMonitor monitor);
>
> /**
> * Returns the dropped data.
> *
> * @return the dropped data.
> */
> public Object getData() {
> return data;
> }
>
> /**
> * Returns the object that the data was dropped on.
> *
> * @return the object that the data was dropped on.
> */
> public Object getDestination() {
> return destination;
> }
>
> /**
> * Called by framework to initialize the action.
> *
> * @param element2 the extension configuration element
> * @param event2 the drop event.
> * @param destination2 the object that the data was dropped on.
> * @param data2 the data that was dropped.
> */
> public void init( IConfigurationElement element2, DropTargetEvent
> event2, int location2,
> Object destination2, Object data2 ) {
> this.element=element2;
> this.event=event2;
> this.location=location2;
> this.destination=destination2;
> this.data=data2;
> }
>
> /**
> * The drop event.
> * @return Returns the drop event.
> */
> public DropTargetEvent getEvent() {
> return event;
> }
>
> /**
> * This does not always make sense for the drop event. But in
> the case that the component is a jface viewer then this method will
> indicate the
> * location where the drop is taking place (before, on or after
> the destination object).
> *
> * @see ViewerDropAdapter#getCurrentLocation()
> *
> * @return If the component is not a viewer this will always
> return [EMAIL PROTECTED] ViewerDropAdapter#LOCATION_ON} otherwise it will be
> one
> of the LOCATION_*
> * values.
> */
> public int getViewerLocation() {
> return location;
> }
>
> }
>
> Jesse
>
>
> On 14-Mar-06, at 12:22 PM, M.S.Bachler wrote:
>
>> Hi!
>>
>> That's great.
>> (I thought it was just me being really thick, and not spotting how to
>> get the x,y).
>>
>> Thanks for adding these changes.
>>
>> I still can't download the source code at the moment - we do use a
>> proxy and I have a feeling it must be blocking some of the command
>> Subversion
>> needs - I will see IT tomorrow about it.
>>
>> As I can't get to the source code - are there any javadocs on these
>> changes so I know what methods/variables are now available.
>>
>> Thanks
>>
>>
>> Michelle
>>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of Jesse
>> Eichar
>> Sent: 14 March 2006 19:08
>> To: User-friendly Desktop Internet GIS
>> Subject: Re: [udig-devel] Shapefiles
>>
>>
>> Ok so a change of plans.
>>
>> I've changed the API slightly. Shouldn't bother you too much, all
>> the
>
>> information is still there in the IDropAction class, now I've added
>> the getEvent() method to the IDropAction class. It has the x,y
>> location of the event.
>>
>> I think I've cleaned things up a little so you shouldn't have to
>> worry
>
>> about any other classes besides the IDropAction (before the
>> UDIGDropHandler was accessible from the IDropAction) I've changed
>> that but made sure that all the information is still available in the
>> IDropAction.
>>
>>
>> Jesse
>>
>> On 14-Mar-06, at 9:33 AM, Jesse Eichar wrote:
>>
>>> Truthfully this is a good question. I think you've identified
>>> another short coming of this API. I am going to make 3 changes to
>>> UDIGDropHandler.
>>>
>>> 1. I'm going to change getLocation to return a Point which will be
>>> the x,y coordinates of the drop event relative to the component that
>>> the component is dropped on. 2. I'm going to add the method
>>> getViewerLocation() that will return ON, BEFORE and AFTER locations.
>
>>> (That is what getLocation() currently does)
>>> 3. I'm going to add a method isViewer() so you can determine if the
>>> control is a viewer and if you should use getViewerLocation() or
>>> getLocation().
>>>
>>> You'll have to download tonights nightly build.
>>>
>>> (Sorry for the hard time you are having but DND has been a real
>>> headache for me to figure out, never mind do right)
>>>
>>> Jesse
>>>
>>> On 14-Mar-06, at 2:19 AM, M.S.Bachler wrote:
>>>
>>>> Hi
>>>>
>>>> Sorry about yesterdays rant.
>>>>
>>>> If you have not lost all patients with me, I would really
>>>> appreciate
>
>>>> it if anyone could tell me how I get the x, y coordinates of the
>>>> drop from my IDropAction class.
>>>>
>>>> Thanks
>>>>
>>>> Michelle
>>>>
>>>> -----Original Message-----
>>>> From: [EMAIL PROTECTED]
>>>> [mailto:[EMAIL PROTECTED] On Behalf Of
>>>> M.S.Bachler
>>>> Sent: 13 March 2006 11:04
>>>> To: User-friendly Desktop Internet GIS
>>>> Subject: RE: [udig-devel] Shapefiles
>>>>
>>>>
>>>> Hi!
>>>>
>>>> Thanks everyone for your various inputs.
>>>> I am still not sure what I am doing (I have decided I am just
>>>> thick!).
>>>>
>>>> I can't see how the DataUtility way or creating a FeatureType
>>>> passes
>
>>>> in the x,y of the point. Then again, I can't even figure out how I
>>>> get the x, y coordinates of the drop from my IDropAction class in
>>>> order to create the coords for my Point class in the first place? I
>>>> have run around the API, but can't figure it out.
>>>>
>>>> Is there really no example code out there that I can study to help
>>>> me
>>
>>>> understand things better. I am unable to download the source code
>>>> with Subversion (I did write to the list about this but no one
>>>> replied). I need the equivalent of "uDig for Dummies" book.
>>>>
>>>> Being a Java developer for many years I thought this project would
>>>> be
>>
>>>> relatively easy. But I think having no familiarity with Eclipse or
>>>> GIS at all, has really not helped me. While Eclipse is becoming
>>>> more
>>>> familiar, 'GIS speak' is still a mistery. I think what seems
>>>> obvious to
>>>> many of you when talking about the code, just escapes me.
>>>>
>>>> I know people are reluctant to spoon feed me the code I need. I
>>>> know
>
>>>> I need to go through the pain barrier and try and understand it all
>>>> myself. But it really hurts, and for various reasons the timescale
>>>> of my project has been shrunk, and I am in danger (for the first
>>>> time in
>>>> my lief!), of not completing something, and having to say I can't
>>>> do it.
>>>>
>>>> I think I have just not reached that eureka moment, when everything
>>>> suddenly clicks into place. I hope it happens soon! I still have a
>>>> head full of floating jigsaw pieces.
>>>>
>>>> Meanwhile, if someone could help me with how I get the x,y of the
>>>> drop, that would be great.
>>>>
>>>> Michelle - ( with a heavy cold - feeling rather sorry for myself :-
>>>> ( - going to get a cup of tea )
>>>>
>>>> -----Original Message-----
>>>> From: [EMAIL PROTECTED]
>>>> [mailto:[EMAIL PROTECTED] On Behalf Of Jody
>>>> Garnett
>>>> Sent: 11 March 2006 08:58
>>>> To: User-friendly Desktop Internet GIS
>>>> Subject: Re: [udig-devel] Shapefiles
>>>>
>>>>
>>>> You guys are working to hard, I wrote a parser method I never
>>>> wanted
>
>>>> to do this stuff twice.
>>>> - http://udig.refractions.net/docs/api-geotools/org/geotools/data/
>>>> DataUtil
>>>> ities.html
>>>>
>>>> The format is silly, but it is in the javadocs:
>>>> - http://udig.refractions.net/docs/api-geotools/org/geotools/data/
>>>> DataUtil
>>>> ities.html#createType(java.lang.String,%20java.lang.String)
>>>>
>>>> basically:
>>>> "name:String,age:Number,position:Point,*destination:Point"
>>>> Where the * indicates the default geometry ..
>>>>
>>>> Other useful stuff:
>>>> - http://udig.refractions.net/docs/api-geotools/org/geotools/
>>>> feature/
>>>> Featu
>>>> reTypes.html
>>>>
>>>> Jody
>>>>>
>>>>>
>>>>> M.S.Bachler wrote:
>>>>>>
>>>>>> Hi!
>>>>>>
>>>>>> Silly question.
>>>>>>
>>>>>> Earlier you helpfully gave me a code snippet to create a new
>>>>>> shapefile.
>>>>>>
>>>>>> IndexedShapefileDatastoreFactory fac=new
>>>>>> IndexedShapefileDataStoreFactory();
>>>>>>
>>>>>> ShapefileDataStore ds=fac.createDatastore(url);
>>>>>>
>>>>>> // I assume this is the URL of the new shapefile I want it to
>>>>>> create?
>>>>>>
>>>>>> GeometryFactory gf = new GeometryFactory();
>>>>>>
>>>>>> ds.createSchema( featureType );
>>>>>>
>>>>>> // Here I got lost. Started to investigate FeatureType and felt
>>>>>> like I was walking through tar.
>>>>>>
>>>>> I did some stuff with FeatureType the other day... trying to
>>>>> create
>
>>>>> a new Feature from scratch. Here is the code I found to create a
>>>>> new
>>>>> FeatureType:
>>>>> AttributeType geomAttr =
>>>> AttributeTypeFactory.newAttributeType("the_geom",
>>>> LineString.class);
>>>>> FeatureType ftRoad =
>>>> FeatureTypeBuilder.newFeatureType(new AttributeType[] {geomAttr},
>>>> "road");
>>>>>
>>>>> // WKTReader wktReader = new WKTReader();
>>>>> // Point geometry = (Point) wktReader.read
>>>>> ("POINT
>>>> (" + lat + " " + lon + ")");
>>>>> GeometryFactory geomFactory = new
>>>> GeometryFactory();
>>>>> LineString geometry =
>>>> geomFactory.createLineString(coords);
>>>>> Feature theRoad = ftRoad.create(new Object[]
>>>>> {geometry}, "myRoad");
>>>>>
>>>>>
>>>>> This example Feature only has one attribute which is the geometry,
>>>>> the_geom. You can create and add other attributes in the
>>>>> AttributType[] and Object[] if needed.
>>>>>
>>>>> These classes are from the org.geotools.feature package.
>>>>>
>>>>> Hopefully you may find this useful. I'm not sure if this is the
>>>>> most
>>
>>>>> up-to-date way of doing it, but it worked for me.
>>>>>
>>>>> Mark
>>>>>
>>>>> --
>>>>> This message has been scanned for viruses and dangerous content by
>>>>> *MailScanner* <http://www.mailscanner.info/>, and is believed
>>>>> to be
>
>>>>> clean. _______________________________________________
>>>>> User-friendly Desktop Internet GIS (uDig)
>>>>> http://udig.refractions.net
>>>>> http://lists.refractions.net/mailman/listinfo/udig-devel
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> User-friendly Desktop Internet GIS (uDig) http://
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>>>> http://lists.refractions.net/mailman/listinfo/udig-devel
>>>> _______________________________________________
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>>>> http://udig.refractions.net
>>>> http://lists.refractions.net/mailman/listinfo/udig-devel
>>>> _______________________________________________
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>>>> http://udig.refractions.net
>>>> http://lists.refractions.net/mailman/listinfo/udig-devel
>>>
>>> _______________________________________________
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>>> udig.refractions.net
>
>>> http://lists.refractions.net/mailman/listinfo/udig-devel
>>
>> _______________________________________________
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>> http://lists.refractions.net/mailman/listinfo/udig-devel
>> _______________________________________________
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>> http://lists.refractions.net/mailman/listinfo/udig-devel
>
> _______________________________________________
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> _______________________________________________
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