Re: jsni - overlay types - js arrays Java API
Thanks! fortunately I didn't get to use it in my projects but I will do it.
GWT should provide with an official library or class for doing native stuff
like this. People porting/wrapping javascript libraries to GWT really need
a good utility class mainly for converting casting java to JavaScript
types and viceversa and are doing it by their own (my work:
http://code.google.com/p/gwtjsutil/) :(
On Friday, September 27, 2013 4:48:21 PM UTC, Greg wrote:
This will NOT work in GWT 2.2
See: https://code.google.com/p/google-web-toolkit/issues/detail?id=6594
Workaround provided there works.
On Monday, December 24, 2012 3:22:11 AM UTC+1, Sebastián Gurin wrote:
Thank you Thomas for your reply, I learned new things. Didn't know about
if ( GWT.isScript() ) {you can cast the js array to java arrays directly
}.
I will definetly use those classes for my projects. Thanks again
--
You received this message because you are subscribed to the Google Groups
Google Web Toolkit group.
To unsubscribe from this group and stop receiving emails from it, send an email
to google-web-toolkit+unsubscr...@googlegroups.com.
To post to this group, send email to google-web-toolkit@googlegroups.com.
Visit this group at http://groups.google.com/group/google-web-toolkit.
For more options, visit https://groups.google.com/groups/opt_out.
Re: jsni - overlay types - js arrays Java API
This will now work in GWT 2.2
See: https://code.google.com/p/google-web-toolkit/issues/detail?id=6594
Workaround provided there works.
On Monday, December 24, 2012 3:22:11 AM UTC+1, Sebastián Gurin wrote:
Thank you Thomas for your reply, I learned new things. Didn't know about
if ( GWT.isScript() ) {you can cast the js array to java arrays directly
}.
I will definetly use those classes for my projects. Thanks again
--
You received this message because you are subscribed to the Google Groups
Google Web Toolkit group.
To unsubscribe from this group and stop receiving emails from it, send an email
to google-web-toolkit+unsubscr...@googlegroups.com.
To post to this group, send email to google-web-toolkit@googlegroups.com.
Visit this group at http://groups.google.com/group/google-web-toolkit.
For more options, visit https://groups.google.com/groups/opt_out.
Re: jsni - overlay types - js arrays Java API
This will NOT work in GWT 2.2
See: https://code.google.com/p/google-web-toolkit/issues/detail?id=6594
Workaround provided there works.
On Monday, December 24, 2012 3:22:11 AM UTC+1, Sebastián Gurin wrote:
Thank you Thomas for your reply, I learned new things. Didn't know about
if ( GWT.isScript() ) {you can cast the js array to java arrays directly
}.
I will definetly use those classes for my projects. Thanks again
--
You received this message because you are subscribed to the Google Groups
Google Web Toolkit group.
To unsubscribe from this group and stop receiving emails from it, send an email
to google-web-toolkit+unsubscr...@googlegroups.com.
To post to this group, send email to google-web-toolkit@googlegroups.com.
Visit this group at http://groups.google.com/group/google-web-toolkit.
For more options, visit https://groups.google.com/groups/opt_out.
Re: jsni - overlay types - js arrays Java API
Thank you Thomas for your reply, I learned new things. Didn't know about
if ( GWT.isScript() ) {you can cast the js array to java arrays directly }.
I will definetly use those classes for my projects. Thanks again
--
You received this message because you are subscribed to the Google Groups
Google Web Toolkit group.
To view this discussion on the web visit
https://groups.google.com/d/msg/google-web-toolkit/-/5gn_erJdUC8J.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en.
jsni - overlay types - js arrays Java API
Hi all. I'm porting some javascript libraries to GWT and in this thread I
hope I can share and learn best ways of accessing Js native arrays from
java language.
I try to add the minimun overhead so I'm using GWT's JsArray, JsArrayMixed,
JsArrayString, etc for referencing arrays whenever I can. But this is not
so friendly for a Java programmer accustomed to work with real java arryas
(String[]) or with java.util.Collection API.
The first thing I thought of was convert js arrays to Java arrays.
Unfortunately i didn't found a way of doing this without (linear overhead);
public static JsArrayNumber toJsArrayDouble(double[]a) {
if(a==null)
return null;
JsArrayNumber jsa = (JsArrayNumber) JsArrayNumber.createArray();
for (int i = 0; i a.length; i++) {
jsa.push(a[i]);
}
return jsa;
}
Now I'm experimenting on wrapping a Js Array into a java Collection. For
this I made a simple Java class that extends java.util.AbstractCollection
[0] and wrapps a pure js array. So from jsni code now I can return Java
Collections instead JsArray like types and the final user of my libs can
write java statements like for(String s : myOverlay.getArrayProp()) {..}.
Also this solution adds very few (constant) overhead. So now I'm using two
getters for js arrays, one that return the real js array object using GWT's
JsArray* and other that return a Java Collection:
/**
* Returns 'columns' property (JavaScript array)
* @return
*/
public native final JsArrayString columns() /*-{
return this[columns];
}-*/;
/**
* Returns 'columns' property (Java Collection)
* @return
*/
public native final CollectionString getColumns() /*-{
return
@org.sgx.test1.client.JsUtil::toJavaCollection(Lcom/google/gwt/core/client/JavaScriptObject;)(this[columns]);
}-*/;
I would like to hear what others in the same situation do. Use JsArray*
GWT's classes vs more Java friendly API ??? Thanks in advance any
suggestion or comment is most appreciated.
[0] - Source code for my Java Collection class wrapper
import java.util.AbstractCollection;
import java.util.Iterator;
import com.google.gwt.core.client.JavaScriptObject;
/**
* a Java Friendly way of working with Js Arrays using the
Java.util.Collection API
* @author sg
*
* @param T
*/
public class JsArrayCollectionT extends AbstractCollectionT {
private JsArrT _data;
/**
* creates an empty array
*/
public JsArrayCollection() {
_data = JsArr.create().cast();
}
/**
* creates JsArrayCollection wrapping an existing js array
*/
public JsArrayCollection(JavaScriptObject data) {
this._data = data.cast();
}
public static T JsArrayCollectionT create(JavaScriptObject data) {
return new JsArrayCollectionT(data);
}
@Override
public IteratorT iterator() {
return new JsArrayIteratorT(this);
}
@Override
public int size() {
return _data.size();
}
public static class JsArrayIteratorT implements IteratorT {
private JsArrayCollectionT arr;
int currentIndex;
public JsArrayIterator(JsArrayCollectionT arr) {
this.arr = arr;
currentIndex=0;
}
@Override
public boolean hasNext() {
//System.out.println(currentIndex+ - +arr.size());
return currentIndex arr.size();
}
@Override
public T next() {
currentIndex++;
return arr._data.get(currentIndex-1);
}
@Override
public void remove() {
arr._data.slice(currentIndex-1, currentIndex);
}
}
/** untyped array */
private static class JsArrT extends JavaScriptObject {
protected JsArr(){}
public native final JsArrT slice(int start, int end)/*-{
return this.slice(start, end);
}-*/;
public static final native T JsArrT create() /*-{
return [];
}-*/;
public final native int size() /*-{
return this.length;
}-*/;
public final native T get(int i) /*-{
return this[i];
}-*/;
}
}
--
You received this message because you are subscribed to the Google Groups
Google Web Toolkit group.
To view this discussion on the web visit
https://groups.google.com/d/msg/google-web-toolkit/-/DbMp1hrjhVUJ.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en.
Re: jsni - overlay types - js arrays Java API
On Friday, December 21, 2012 8:39:34 PM UTC+1, Sebastián Gurin wrote:
Hi all. I'm porting some javascript libraries to GWT and in this thread I
hope I can share and learn best ways of accessing Js native arrays from
java language.
I try to add the minimun overhead so I'm using GWT's JsArray,
JsArrayMixed, JsArrayString, etc for referencing arrays whenever I can. But
this is not so friendly for a Java programmer accustomed to work with real
java arryas (String[]) or with java.util.Collection API.
The first thing I thought of was convert js arrays to Java arrays.
Unfortunately i didn't found a way of doing this without (linear overhead);
public static JsArrayNumber toJsArrayDouble(double[]a) {
There's
http://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/core/client/JsArrayUtils.html
for that, but it comes with restrictions on what you're allowed to do with
the returned value.
For the reverse, see
https://code.google.com/p/gwt-in-the-air/source/browse/trunk/src/net/ltgt/gwt/jscollections/client/JsArrays.java
That reverse operation allows using a for loop to iterate on a JsArray*,
e.g.: for (double : toArray(myJsArrayNumber)) { … }
Now I'm experimenting on wrapping a Js Array into a java Collection. For
this I made a simple Java class that extends java.util.AbstractCollection
[0] and wrapps a pure js array. So from jsni code now I can return Java
Collections instead JsArray like types and the final user of my libs can
write java statements like for(String s : myOverlay.getArrayProp()) {..}.
Also this solution adds very few (constant) overhead. So now I'm using two
getters for js arrays, one that return the real js array object using GWT's
JsArray* and other that return a Java Collection:
/**
* Returns 'columns' property (JavaScript array)
* @return
*/
public native final JsArrayString columns() /*-{
return this[columns];
}-*/;
/**
* Returns 'columns' property (Java Collection)
* @return
*/
public native final CollectionString getColumns() /*-{
return
@org.sgx.test1.client.JsUtil::toJavaCollection(Lcom/google/gwt/core/client/JavaScriptObject;)(this[columns]);
}-*/;
FYI, I would have written it:
public final CollectionString getColumns() {
return JsUtils.toJavaCollection(columns());
}
I would like to hear what others in the same situation do. Use JsArray*
GWT's classes vs more Java friendly API ??? Thanks in advance any
suggestion or comment is most appreciated.
[0] - Source code for my Java Collection class wrapper
import java.util.AbstractCollection;
import java.util.Iterator;
import com.google.gwt.core.client.JavaScriptObject;
/**
* a Java Friendly way of working with Js Arrays using the
Java.util.Collection API
* @author sg
*
* @param T
*/
public class JsArrayCollectionT extends AbstractCollectionT {
Maybe we should have something like that in GWT proper. There hasn't been
much demand AFAICT, and if we start going that way, people will likely ask
for java.util.List rather than java.util.Collection.
--
You received this message because you are subscribed to the Google Groups
Google Web Toolkit group.
To view this discussion on the web visit
https://groups.google.com/d/msg/google-web-toolkit/-/C8GfwAM0ItAJ.
To post to this group, send email to google-web-toolkit@googlegroups.com.
To unsubscribe from this group, send email to
google-web-toolkit+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en.
