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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 33352] New: - add collection modifiers feature to PropertyUtilsBean.
Date Wed, 02 Feb 2005 11:04:47 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=33352

           Summary: add collection modifiers feature to PropertyUtilsBean.
           Product: Commons
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Bean Utilities
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: marc.dexet@dsi.cnrs.fr


There's some java beans who are not lazy ones and who need to modify collection
type properties. Ongoing propertyUtilsBean only allows to set indexed property,
but not to add or remove items in collection.

This is a proposition to add following new features :

- propertyUtilsBean.(add | remove )CollectionPropertyValue(Object bean, String
name, Object value)

Action: (add to | remove from ) bean property name a value.
In other words, search a method (add | remove)item(parameterType value) where
parameterType.isAssignable(value.class) to add value to item collection, item
collection bean property being deduced with a stemmer algo (as in
betwixt.DefaultPluralStemmer) from method name and declared by
getProperty(bean,name).getClass();

Sample : 
myPropertyUtilsBean.addCollectionPropertyValue(myBean,
"productMap("food").catalog.products", new Product("acmeDogFood", 12));
will use Catalog.addProduct(Product p) to add new Product("acmeDogFood", 12) to
inner collection Catalog.products.



- PropertyUtilsBean.(add | remove )CollectionPropertyValue(Object bean, String
property, String itemName, Object value)

Action: (add to | remove from ) bean property name a value.
In other words, search a method (add | remove)item(parameterType value) where
parameterType.isAssignable(value.class) to add value to item collection, item
collection being deduced with a stemmer algo (as in
betwixt.DefaultPluralStemmer) from itemName and declared by
getProperty(bean,name).getClass();

Sample : 
myPropertyUtilsBean.addCollectionPropertyValue(myBean,
"productMap("food").catalog","product", new Product("acmeDogFood", 12));
will use Catalog.addProduct(Product p) to add new Product("acmeDogFood", 12) to
inner Catalog.productList.

If there's no Catalog.addProduct(Product p) method, try to invoke
Collection.add(Object obj) on Catalog.products.

I have yet created in PropertyUtilsBean sub class such feature as demonstrator
and unit tests work (for the meantime).

Constraints:
- Object are to apply java beans specification.
- Collection must have readable method ( to be considered as bean property)
- adder and remover method have to follow conventions copied from
org.apache.commons.betwixt.strategy.DefaultPluralStemmer

Matching select in this order for an given itemName or a deduced from method
name one:

   1. get itemName+"s" :("items")
   2. if ( itemName ends with "y" )
         1. get itemName+"es" (no sample, my english is too poor !)
         2. get substitute itemName ending with "ies" ("baby" => "babies")
   3. get itemName + "List"
   4. get itemName + "Set"
   5. get itemName + "Collection
   6. Browse propertyMap to get a property starting with itemName, as "itemBag".
      If there's several property matching later, select the longuest property
name : "itemBagCollection" instead of "itemBag"
      
- method selection :
If two methods match this upper requirements (name (add | remove)Item(ParmType
value) and parameterType.isAssignable(value.class)) , first method matching is
selected. Methods are ordered following min "distance" metric :
- "Distance" metric is the base on 
            public int getDistance(Class c) {
                Class superclass = c.getSuperclass();
                int distance = 0;
                while ( superclass != null ) {
                    superclass = superclass.getSuperclass();
                    distance ++;
                }
                return distance;
            }

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