Hi robain !
Here is how it works :
Your defined a constraint : in that case we extended ListOfValuesConstraint to select the values from a database or anywhere else.
In your web-client-config-custom.xml you should have define that you want to display the property with the constraint.
<property-sheet>
<show-property name="tc:codestr" component-generator="ListOfValuesQueryGenerator" />
</property-sheet>
If you don't put the additional attribut "component-generator", Alfresco will use a list with the values as values and labels of the drop down list. But here we want to have values as values and labels as labels. So we have to create a component generator.
As you can see, I added an additional attribute "component-generator". This attribute means that when alfresco will display the property, it'll use ListOfValuesQueryGenerator to create the component. The Generator is a subclass of org.alfresco.web.bean.generator.TextFieldGenerator. You must override the createComponent and generate methods.
This componentGenerator will call getSelectedItems.
public UIComponent generate(FacesContext context, String id) {
UIOutput component = (UIOutput)context.getApplication().createComponent(
ComponentConstants.JAVAX_FACES_OUTPUT);
component.setRendererType(ComponentConstants.JAVAX_FACES_TEXT);
FacesHelper.setupComponentId(context, component, id);
return component;
}
protected UIComponent createComponent(FacesContext context, UIPropertySheet propertySheet, PropertySheetItem item) {
UIComponent component = null;
if (propertySheet.inEditMode()) {
ListOfValuesQueryConstraint constraint=this.getListOfValuesQuery(context, propertySheet, item);
PropertyDefinition propDef = this.getPropertyDefinition(context, propertySheet.getNode(), item.getName());
if (constraint != null && item.isReadOnly() == false && propDef != null && propDef.isProtected() == false) {
component = context.getApplication().createComponent(UISelectOne.COMPONENT_TYPE);
FacesHelper.setupComponentId(context, component, item.getName());
UISelectItems itemsComponent = (UISelectItems)context.getApplication().createComponent("javax.faces.SelectItems");
itemsComponent.setValue(constraint.getSelectItemList());
component.getChildren().add(itemsComponent);
}
}
else {
component = generate(context, item.getName());
}
return component;
}
protected ListOfValuesQueryConstraint getListOfValuesQuery(FacesContext context, UIPropertySheet propertySheet, PropertySheetItem item) {
ListOfValuesQueryConstraint lovqConstraint = null;
PropertyDefinition propertyDef = getPropertyDefinition(context, propertySheet.getNode(), item.getName());
if (propertyDef != null) {
List<ConstraintDefinition> constraints = propertyDef.getConstraints();
for (ConstraintDefinition constraintDef : constraints) {
Constraint constraint = constraintDef.getConstraint();
if (constraint instanceof ListOfValuesQueryConstraint) {
lovqConstraint = (ListOfValuesQueryConstraint)constraint;
break;
}
}
}
return lovqConstraint;
}
Ok now the Edit mode will work perfectly. But the problem is to display the field in view mode. Alfresco will show the value and not the label. So here you have to use a converter.
In your generator add this :
protected void setupConverter(FacesContext context, UIPropertySheet propertySheet, PropertySheetItem property, PropertyDefinition propertyDef, UIComponent component) {
super.setupConverter(context, propertySheet, property, propertyDef, component);
if(!propertySheet.inEditMode() && propertyDef != null && component instanceof UIOutput) {
((UIOutput)component).setConverter(new ListOfValuesQueryConverter(this.getListOfValuesQuery(context, propertySheet, property)));
}
}
and create the converter
public class ListOfValuesQueryConverter implements Converter,StateHolder {
private ListOfValuesQueryConstraint constraint;
public ListOfValuesQueryConverter(ListOfValuesQueryConstraint constraint) {
this.constraint=constraint;
}
public Object getAsObject(FacesContext context, UIComponent component, String value) throws ConverterException {
return new Object();
}
public String getAsString(FacesContext context, UIComponent component, Object value) throws ConverterException {
if(value instanceof String) {
List<String> l = this.constraint.getAllowedValues();
for(int i=0;i<l.size();i++) {
if(l.get(i).equals((String)value)) {
return this.constraint.getAllowedLabels().get(i);
}
}
}
else if(value instanceof List) {
String result="";
List<String> l = this.constraint.getAllowedValues();
for(String val : (List<String>)value) {
for(int i=0;i<l.size();i++) {
if(l.get(i).equals(val)) {
result+=this.constraint.getAllowedLabels().get(i)+" ";
break;
}
}
}
return result;
}
return new String();
}
public ListOfValuesQueryConverter() {}
public Object saveState(FacesContext context) { return (Object)this.constraint; }
public void restoreState(FacesContext context, Object state) { this.constraint=(ListOfValuesQueryConstraint)state; }
public boolean isTransient() { return false; }
public void setTransient(boolean newTransientValue) {}
}
we could have use the "converter=" attribute in the web-client-config-custom.xml but good luck to do it. I tried hard and it didn't work out.
What package is this?
