StorageTierAssoc (Alluxio Core - Common Utilities 295 API)

```
public interface StorageTierAssoc
```
A two-way mapping between storage tier aliases and ordinal numbers from configuration.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.String`	`getAlias(int ordinal)`
`java.util.List<java.lang.String>`	`getOrderedStorageAliases()`
`int`	`getOrdinal(java.lang.String alias)`
`java.util.List<Pair<BlockStoreLocation,BlockStoreLocation>>`	`intersectionList()`
`int`	`size()`

- Method Detail
  - getAlias
```
java.lang.String getAlias(int ordinal)
```
    Parameters:
    
    ordinal - a storage tier ordinal
    
    Returns:
    
    the storage tier alias matching the given ordinal
  - getOrdinal
```
int getOrdinal(java.lang.String alias)
```
    Parameters:
    
    alias - a storage tier alias
    
    Returns:
    
    the storage tier ordinal matching the given alias
  - size
```
int size()
```
    Returns:
    
    the size of the alias-ordinal mapping
  - getOrderedStorageAliases
```
java.util.List<java.lang.String> getOrderedStorageAliases()
```
    Returns:
    
    a list of storage tier aliases in order of their ordinal value
  - intersectionList
```
java.util.List<Pair<BlockStoreLocation,BlockStoreLocation>> intersectionList()
```
    Returns:
    
    list of intersections between tier levels