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From "Simone Tripodi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JCR-3489) enhance get/set Property value access, expanding the supported types set
Date Wed, 19 Dec 2012 10:19:14 GMT
Simone Tripodi created JCR-3489:
-----------------------------------

             Summary: enhance get/set Property value access, expanding the supported types
set
                 Key: JCR-3489
                 URL: https://issues.apache.org/jira/browse/JCR-3489
             Project: Jackrabbit Content Repository
          Issue Type: Improvement
          Components: jackrabbit-jcr-commons
    Affects Versions: 2.5.2
            Reporter: Simone Tripodi
            Priority: Minor
             Fix For: 2.6


The idea is having a small EDSL that simplifies the access to {{Property}} value, so rather
than coding the following:

{code}
Property property = ...;
boolean oldValue = property.getBoolean();

boolean newValue = !oldValue;
property.setValue(newValue);
{code}

it could be simplified specifying wich type the users are interested on:

{code}
PropertyAccessors propertiesAccessor = ...;

boolean oldValue = propertiesAccessor.get(property).to(boolean.class);

boolean newValue = !oldValue;
propertiesAccessor.set(newValue).to(property);
{code}

where {{PropertiesAccessor}} is the delegated to handle right types handling. By default it
supports default {{Property}} value types, but it could be extended.

It could happen also that users would like to support a larger set of types, maybe performing
conversions to/from default {{Property}} types, so rather than inserting the custom code in
the app when required, they could  use the {{PropertiesAccessor}}; they first need to register
the Accessor implementation to (un)bind the type:

{code}
propertiesAccessor.handle(URI.class).with(new PropertyAccessor<URI>() {

            @Override
            public void set(URI value, Property target) throws ValueFormatException, RepositoryException
{
                // ...
            }

            @Override
            public URI get(Property property) throws ValueFormatException, RepositoryException
{
                // TODO ...
                return null;
            }

        });
{code}

so they can use the accessor via the {{PropertiesAccessor}}:

{code}
URI oldValue = propertiesAccessor.get(property).to(URI.class);

URI newValue = URI.create("http://jackrabbit.apache.org/");
propertiesAccessor.set(newValue).to(property);
{code}

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