DefaultRuleKeyScopedHasher (Buck)

java.lang.Object
- com.facebook.buck.rules.keys.DefaultRuleKeyScopedHasher<HASH>

All Implemented Interfaces:

RuleKeyScopedHasher
```
public class DefaultRuleKeyScopedHasher<HASH>
extends Object
implements RuleKeyScopedHasher
```
A wrapper of RuleKeyHasher that provides scoped hashing facilities.
Important: Container, wrapper and key signatures only get hashed if their scope was non-empty. I.e. if at least one thing gets hashed under their scope. This is to support rule key builders that ignore some fields.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class DefaultRuleKeyScopedHasher.DefaultContainerScope
- Nested classes/interfaces inherited from interface com.facebook.buck.rules.keys.RuleKeyScopedHasher
  RuleKeyScopedHasher.ContainerScope

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`RuleKeyScopedHasher.ContainerScope`	`containerScope(RuleKeyHasher.Container container)`	Hashes the container iff non-empty (i.e.
`CountingRuleKeyHasher<HASH>`	`getHasher()`
`Scope`	`keyScope(String key)`	Hashes the key iff non-empty (i.e.
`Scope`	`pathKeyScope(Path key)`	Hashes the key iff non-empty (i.e.
`Scope`	`wrapperScope(RuleKeyHasher.Wrapper wrapper)`	Hashes the wrapper iff non-empty (i.e.

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

- Method Detail
  - getHasher
```
public CountingRuleKeyHasher<HASH> getHasher()
```
  - keyScope
```
public Scope keyScope(String key)
```
    Hashes the key iff non-empty (i.e. if anything gets hashed during its scope).
    
    Specified by:
    
    keyScope in interface RuleKeyScopedHasher
  - pathKeyScope
```
public Scope pathKeyScope(Path key)
```
    Hashes the key iff non-empty (i.e. if anything gets hashed during its scope).
    
    Specified by:
    
    pathKeyScope in interface RuleKeyScopedHasher
  - wrapperScope
```
public Scope wrapperScope(RuleKeyHasher.Wrapper wrapper)
```
    Hashes the wrapper iff non-empty (i.e. if any element gets hashed during its scope).
    
    Specified by:
    
    wrapperScope in interface RuleKeyScopedHasher
  - containerScope
```
public RuleKeyScopedHasher.ContainerScope containerScope(RuleKeyHasher.Container container)
```
    Hashes the container iff non-empty (i.e. if any element gets hashed during its scope).
    Note that an element scope needs to be created for each element!
    
    Specified by:
    
    containerScope in interface RuleKeyScopedHasher