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LookupOperation详解_lookupoperation gradle

作者：思考机器4 | 2024-02-02 18:46:12

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lookupoperation gradle

java.lang.Object
- org.springframework.data.mongodb.core.aggregation.LookupOperation

All Implemented Interfaces:
AggregationOperation, FieldsExposingAggregationOperation, FieldsExposingAggregationOperation.InheritsFieldsAggregationOperation
```
public class LookupOperation
extends Object
implements FieldsExposingAggregationOperation, FieldsExposingAggregationOperation.InheritsFieldsAggregationOperation
```
Encapsulates the aggregation framework $lookup-operation. We recommend to use the static factory method Aggregation.lookup(String, String, String, String) instead of creating instances of this class directly.

Since:
1.9
Author:
Alessio Fachechi, Christoph Strobl, Mark Paluch
See Also:
MongoDB Aggregation Framework: $lookup

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static interface`	`LookupOperation.AsBuilder`
`static interface`	`LookupOperation.ForeignFieldBuilder`
`static interface`	`LookupOperation.FromBuilder`
`static interface`	`LookupOperation.LocalFieldBuilder`
`static class`	`LookupOperation.LookupOperationBuilder` Builder for fluent `LookupOperation` creation.

Nested classes/interfaces inherited from interface org.springframework.data.mongodb.core.aggregation.FieldsExposingAggregationOperation
FieldsExposingAggregationOperation.InheritsFieldsAggregationOperation

Constructor Summary

Constructors
Constructor and Description
`LookupOperation(Field from, Field localField, Field foreignField, Field as)` Creates a new `LookupOperation` for the given `Field`s.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`ExposedFields`	`getFields()` Returns the fields exposed by the `AggregationOperation`.
`static LookupOperation.FromBuilder`	`newLookup()` Get a builder that allows creation of `LookupOperation`.
`org.bson.Document`	`toDocument(AggregationOperationContext context)` Turns the `AggregationOperation` into a `Document` by using the given `AggregationOperationContext`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - LookupOperation
```
public LookupOperation(Field from,
                       Field localField,
                       Field foreignField,
                       Field as)
```
    Creates a new LookupOperation for the given Fields.
    
    Parameters:
    from - must not be null.
    
    localField - must not be null.
    
    foreignField - must not be null.
    
    as - must not be null.
- Method Detail
  - getFields
```
public ExposedFields getFields()
```
    Description copied from interface: FieldsExposingAggregationOperation
    
    Returns the fields exposed by the AggregationOperation.
    
    Specified by:
    getFields in interface FieldsExposingAggregationOperation
    Returns:
    will never be null.
  - toDocument
```
public org.bson.Document toDocument(AggregationOperationContext context)
```
    Description copied from interface: AggregationOperation
    
    Turns the AggregationOperation into a Document by using the given AggregationOperationContext.
    
    Specified by:
    toDocument in interface AggregationOperation
    Returns:
    the Document
  - newLookup
```
public static LookupOperation.FromBuilder newLookup()
```
    Get a builder that allows creation of LookupOperation.
    
    Returns:

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