Populator (Objectify App Engine 6.0.7 API)

All Known Implementing Classes:

ClassPopulator, KeyPopulator, NullPopulator, PropertyPopulator
```
public interface Populator<P>
```
A populator knows how to copy properties between POJO objects and the native datastore representation. Unlike a translator, it doesn't create the POJO or container.

P is the pojo type.

Author:

Jeff Schnitzer

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`load(com.google.cloud.datastore.FullEntity<?> node, LoadContext ctx, Path path, P into)`	Loads the content of the specified datastore node into an existing POJO.
`void`	`save(P pojo, boolean index, SaveContext ctx, Path path, com.google.cloud.datastore.FullEntity.Builder<?> into)`	Saves data from the POJO into the entity builder.

- Method Detail
  - load
```
void load(com.google.cloud.datastore.FullEntity<?> node,
          LoadContext ctx,
          Path path,
          P into)
```
    Loads the content of the specified datastore node into an existing POJO.
    
    Parameters:
    
    node - is the part of the native datastore entity tree we are transforming.
    
    ctx - holds state information during an entity load.
    
    path - is the current path to this POJO
  - save
```
void save(P pojo,
          boolean index,
          SaveContext ctx,
          Path path,
          com.google.cloud.datastore.FullEntity.Builder<?> into)
```
    Saves data from the POJO into the entity builder.
    
    Parameters:
    
    pojo - is an object from the pojo entity graph; possibly the whole graph or possibly just a leaf field.
    
    index - is whether the instruction so far is to index or not index property values
    
    path - is the path that we have taken to get here, which could be long due to re-entrant translators (ie, an embedded pojo that also has a reference to the same class).