[Jakarta-tapestry Wiki] Update of "PropertySelectionForAll" by diogenes

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The following page has been changed by diogenes:
http://wiki.apache.org/jakarta-tapestry/PropertySelectionForAll

The comment on the change is:
sorry for my english, I´m Argentinian.Please if any one may be fix this notes

New page:
following we will be include a simple sample for use a property selection

The first step is desig a html template. In this template you must include a 
tapestry tag like this.
{{{
....
<span jwcid="@PropertySelection" value="ognl:propertyName" 
model="ognl:collectionName"></span>
....
}}}

then you must define a class, this class must implement the 
IPropertySelectionModel Interface. 

{{{

import java.io.Serializable;

import org.apache.tapestry.form.IPropertySelectionModel;

public class SelectionObject implements IPropertySelectionModel, Serializable {
        
        /**
         * 
         */
        private static final long serialVersionUID = 1L;
        private Object[] core;
        private String methodName;
        
        private String getMethodName() {
                return methodName;
        }
        
        private void setMethodName(String methodName) {
                this.methodName = methodName;
        }
        
        private Object[] getCore() {
                return core;
        }
        
        private void setCore(Object[] core) {
                this.core = core;
        }
        
        public SelectionObject(Object[] data,String method) {
                this.setCore(data);
                this.setMethodName(method);
        }
        
        public SelectionObject(Object[] data) {
                this.setCore(data);
                this.setMethodName("toString");
        }
        
        public int getOptionCount() {
                return this.getCore().length;
        }
        
        public Object getOption(int arg0) {
                return this.getCore()[arg0];
        }
        
        public String getLabel(int arg0) {
                try {
                        return 
this.getCore()[arg0].getClass().getMethod(this.getMethodName(),new 
Class[]{}).invoke(this.getCore()[arg0],new Object[]{}).toString();
                } catch (Exception e) {
                        e.printStackTrace();
                }
                return null;
        }
        
        public String getValue(int arg0) {
                return Integer.toString(arg0);
        }
        
        public Object translateValue(String arg0) {
                int index;
                index = Integer.parseInt(arg0);
                return this.getCore()[index]; 
        }
}

}}}

this class can contein any object's cain. Please see the constructor with 2 
parameters. the first parameter is an array the objects. this objects will be 
assign to the property and the second parameter, is a String with the method 
name for invoke and obteing the representation for the user in the combo box.
And then in you Page Implementation you must include a code like this.

{{{
public abstract class YourPage implements PageBeginRenderListener{
        
...     
        private IPropertySelectionModel collectionName;

        public void pageBeginRender(PageEvent event){
         .....
                this.setCollectionName(new 
SelectionObject(youObjectArray[],"youMethod"));
         ....
        }
        
.....
        public IPropertySelectionModel getCollectionName() {
                return collectionName;
        }
        public void setCollectionName(IPropertySelectionModel collection) {
                this.collectionName = collection;
        }

       @Perstist
       public abstract youObject getPropertyName();
       public abstract void setPropertyName(youObject);


......
}

}}}

when the use make submit the property ''PropertyName'' will be set with de 
object selected in the combo box for the user.

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