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Support for nested path using field access

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This commit adds a nested path support for DirectFieldAccessor that is
similar to what BeanWrapper provides. It is now possible to use
expressions such as "person.address.city.name" to access the name of
the city that a given person lives in using fields to traverse the
graph.

DirectFieldAccessor also now supports an auto-grow option to create
a default instance for a "null" intermediate path. This option is
false by default and leads to a NullValueInNestedPathException in such
a case.

This commit also harmonizes part of the tests suite so that core tests
are shared between BeanWrapperImpl and DirectFieldAccessor.

Note that map and list access is not implemented as part of this
commit.

Issue: SPR-9705
This commit is contained in:
Stephane Nicoll
2014-06-26 19:19:56 +02:00
parent 442bd682a7
commit 8221c9abc5
9 changed files with 670 additions and 155 deletions
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4
spring-context/src/main/java/org/springframework/validation/DataBinder.java
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@@ -189,8 +189,8 @@ public class DataBinder implements PropertyEditorRegistry, TypeConverter {
* <p>If "true", a null path location will be populated with a default object value and traversed
* instead of resulting in an exception. This flag also enables auto-growth of collection elements
* when accessing an out-of-bounds index.
* <p>Default is "true" on a standard DataBinder. Note that this feature is only supported
* for bean property access (DataBinder's default mode), not for field access.
* <p>Default is "true" on a standard DataBinder. Note that since Spring 4.1 this feature is supported
* for bean property access (DataBinder's default mode) and field access.
* @see #initBeanPropertyAccess()
* @see org.springframework.beans.BeanWrapper#setAutoGrowNestedPaths
*/