org.eclipse.rdf4j.query.parser.sparql

## Class PrefixDeclProcessor

- java.lang.Object
- - org.eclipse.rdf4j.query.parser.sparql.PrefixDeclProcessor

-     @InternalUseOnly
      public class PrefixDeclProcessor
      extends Object

  Processes the prefix declarations in a SPARQL query model.
  Author:
    Arjohn Kampman

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `PrefixDeclProcessor()`

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static Map<String,String>` | `process(org.eclipse.rdf4j.query.parser.sparql.ast.ASTOperationContainer qc)` Processes prefix declarations in queries.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### PrefixDeclProcessor

          public PrefixDeclProcessor()

  - ### Method Detail

    - #### process

          public static Map<String,String> process(org.eclipse.rdf4j.query.parser.sparql.ast.ASTOperationContainer qc)
                                            throws MalformedQueryException

      Processes prefix declarations in queries. This method collects all prefixes that are declared in the supplied query, verifies that prefixes are not redefined and replaces any `ASTQName` nodes in the query with equivalent `ASTIRI` nodes.
      Parameters:
        `qc` - The query that needs to be processed.
      Returns:
        A map containing the prefixes that are declared in the query (key) and the namespace they map to (value).
      Throws:
        `MalformedQueryException` - If the query contains redefined prefixes or qnames that use undefined prefixes.

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