| Package | Description | 
|---|---|
| org.apache.hadoop.yarn.util.constraint | Package org.apache.hadoop.yarn.util.constraint contains classes
 which is used as utility class for placement constraints. | 
| Modifier and Type | Class and Description | 
|---|---|
| static class  | PlacementConstraintParser.BaseStringTokenizerA basic tokenizer that splits an expression by a given delimiter. | 
| static class  | PlacementConstraintParser.ConjunctionTokenizerTokenizer used to parse conjunction form of a constraint expression,
 [AND|OR](C1:C2:...:Cn). | 
| static class  | PlacementConstraintParser.MultipleConstraintsTokenizerTokenizer used to handle a placement spec composed by multiple
 constraint expressions. | 
| static class  | PlacementConstraintParser.SourceTagsTokenizerTokenizer used to parse allocation tags expression, which should be
 in tag=numOfAllocations syntax. | 
| Constructor and Description | 
|---|
| ConstraintParser(PlacementConstraintParser.ConstraintTokenizer tk) | 
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