PathExpression.GroupBy (Hydra Java API)

java.lang.Object
- com.gdblab.pathAlgebra.expressions.PathExpression
- - com.gdblab.pathAlgebra.expressions.PathExpression.GroupBy

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<PathExpression>

Enclosing class:

PathExpression
```
public static final class PathExpression.GroupBy
extends PathExpression
implements java.io.Serializable
```
Group-by operator (γ): organize paths into solution space

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class com.gdblab.pathAlgebra.expressions.PathExpression
  PathExpression.Base, PathExpression.GroupBy, PathExpression.Join, PathExpression.OrderBy, PathExpression.PartialVisitor<R>, PathExpression.Projection, PathExpression.Recursive, PathExpression.Selection, PathExpression.Union, PathExpression.Visitor<R>

Field Summary

Fields
Modifier and Type Field Description

GroupByExpression value
- Fields inherited from class com.gdblab.pathAlgebra.expressions.PathExpression
  BASE, GROUP_BY, JOIN, ORDER_BY, PROJECTION, RECURSIVE, SELECTION, TYPE_, UNION

Constructor Summary

Constructors
Constructor Description

GroupBy(GroupByExpression value)
Constructs an immutable PathExpression.GroupBy.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`<R> R`	`accept(PathExpression.Visitor<R> visitor)`	Dispatch to `visitor`.
`int`	`compareTo(PathExpression other)`
`boolean`	`equals(java.lang.Object other)`
`int`	`hashCode()`

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

- Field Detail
  - value
```
public final GroupByExpression value
```
- Constructor Detail
  - GroupBy
```
public GroupBy(GroupByExpression value)
```
    Constructs an immutable PathExpression.GroupBy.
- Method Detail
  - equals
```
public boolean equals(java.lang.Object other)
```
    Overrides:
    
    equals in class java.lang.Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object
  - compareTo
```
public int compareTo(PathExpression other)
```
    Specified by:
    
    compareTo in interface java.lang.Comparable<PathExpression>
  - accept
```
public <R> R accept(PathExpression.Visitor<R> visitor)
```
    Dispatch to visitor.
    
    Specified by:
    
    accept in class PathExpression