Refinable (cdk 2.9 API)

```
public interface Refinable
```
Implementors are graph-like objects that are refinable by the equitable and discrete partition refiners.

Author:

maclean

Belongs to CDK module:
group

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`getConnectivity(int vertexI, int vertexJ)`	Get the connectivity between two vertices as an integer, to allow for multigraphs : so a single edge is 1, a double edge 2, etc.
`Partition`	`getInitialPartition()`	Get an initial partition of the vertices of the refinable - for example, by color.
`int`	`getVertexCount()`	Get the number of vertices in the graph to be refined.
`Invariant`	`neighboursInBlock(Set<Integer> block, int vertexIndex)`	Given a block (or cell) of a partition, determine the invariant that represents the intersection between the block and the neighbours of vertexIndex supplied.

- Method Detail
  - neighboursInBlock
```
Invariant neighboursInBlock(Set<Integer> block,
                            int vertexIndex)
```
    Given a block (or cell) of a partition, determine the invariant that represents the intersection between the block and the neighbours of vertexIndex supplied.
    
    Parameters:
    
    block - a cell of the partition under refinement
    
    vertexIndex - the element to compare
    
    Returns:
    
    the size of the intersection between the neighbours and the block
  - getVertexCount
```
int getVertexCount()
```
    Get the number of vertices in the graph to be refined.
    
    Returns:
    
    a count of the vertices in the underlying graph
  - getConnectivity
```
int getConnectivity(int vertexI,
                    int vertexJ)
```
    Get the connectivity between two vertices as an integer, to allow for multigraphs : so a single edge is 1, a double edge 2, etc. If there is no edge, then 0 should be returned.
    
    Parameters:
    
    vertexI - a vertex of the graph
    
    vertexJ - a vertex of the graph
    
    Returns:
    
    the multiplicity of the edge (0, 1, 2, 3, ...)
  - getInitialPartition
```
Partition getInitialPartition()
```
    Get an initial partition of the vertices of the refinable - for example, by color.
    
    Returns:
    
    a partition of the vertices