CacheKey

```
public interface CacheKey

                    
```
Strongly typed cache key to be used instead of Object.
toString, equals and hashCode methods must be implemented.

Method Summary

Modifier and Type	Method	Description
`abstract String`	`toString()`	This is useful for instrumentation and debugging purposes.
`abstract boolean`	`equals(Object o)`	This method must be implemented, otherwise the cache keys will be be compared by reference.
`abstract int`	`hashCode()`	This method must be implemented with accordance to the equals method.
`abstract boolean`	`containsUri(Uri uri)`	Returns true if this key was constructed from this Uri.
`abstract String`	`getUriString()`	Returns a string representation of the URI at the heart of the cache key.
`abstract boolean`	`isResourceIdForDebugging()`	Returns true if this key was constructed from a resource ID.

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

- Method Detail
  - toString
```
 abstract String toString()
```
    This is useful for instrumentation and debugging purposes.
  - equals
```
 abstract boolean equals(Object o)
```
    This method must be implemented, otherwise the cache keys will be be compared by reference.
  - hashCode
```
 abstract int hashCode()
```
    This method must be implemented with accordance to the equals method.
  - containsUri
```
 abstract boolean containsUri(Uri uri)
```
    Returns true if this key was constructed from this Uri.
    Used for cases like deleting all keys for a given uri.
  - getUriString
```
 abstract String getUriString()
```
    Returns a string representation of the URI at the heart of the cache key. In cases of multiplekeys being contained, the first is returned.
  - isResourceIdForDebugging
```
 abstract boolean isResourceIdForDebugging()
```
    Returns true if this key was constructed from a resource ID. If this ever changes, the diskcache entries corresponding to this cache key would be invalidated.