AssociationsPayloadIterator (Lucene 3.6.2 API)
Keywords: org.apache.lucene.facet.enhancements.association.AssociationsPayloadIterator class

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## org.apache.lucene.facet.enhancements.association
Class AssociationsPayloadIterator

    java.lang.Object
      org.apache.lucene.facet.enhancements.association.AssociationsPayloadIterator

    public class AssociationsPayloadIterator

extends Object

Allows easy iteration over the associations payload, decoding and breaking it to (ordinal, value) pairs, stored in a hash.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary
`static Term` | `ASSOCIATION_POSTING_TERM` Default Term for associations
`static long` | `NO_ASSOCIATION` The long-special-value returned for ordinals which have no associated int value.

Constructor Summary
`AssociationsPayloadIterator(IndexReader reader, String field)` Construct a new association-iterator, initializing the inner payload iterator, with the supplied term and checking whether there are any associations within the given index

Method Summary
`boolean` | `equals(Object obj)`
`IntIterator` | `getAssociatedOrdinals()` Get an iterator over the ordinals which has an association for the document set by `setNextDoc(int)`.
`long` | `getAssociation(int ordinal)` Get int association value for the given ordinal.
`int` | `hashCode()`
`boolean` | `setNextDoc(int docId)` Skipping to the next document, fetching its associations & populating the map.

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

Field Detail

### ASSOCIATION_POSTING_TERM

    public static final Term ASSOCIATION_POSTING_TERM

  Default Term for associations

### NO_ASSOCIATION

    public static final long NO_ASSOCIATION

  The long-special-value returned for ordinals which have no associated int value. It is not in the int range of values making it a valid mark.

  See Also:
    Constant Field Values

Constructor Detail

### AssociationsPayloadIterator

    public AssociationsPayloadIterator(IndexReader reader,
                                       String field)
                                throws IOException

  Construct a new association-iterator, initializing the inner payload iterator, with the supplied term and checking whether there are any associations within the given index

  Parameters:
    `reader` - a reader containing the postings to be iterated
    `field` - the field containing the relevant associations list term
  Throws:
    `IOException`

Method Detail

### setNextDoc

    public boolean setNextDoc(int docId)
                       throws IOException

  Skipping to the next document, fetching its associations & populating the map.

  Parameters:
    `docId` - document id to be skipped to
  Returns:
    true if the document contains associations and they were fetched correctly. false otherwise.
  Throws:
    `IOException` - on error

### getAssociation

    public long getAssociation(int ordinal)

  Get int association value for the given ordinal.
  The return is either an int value casted as long if the ordinal has an associated value. Otherwise the returned value would be `NO_ASSOCIATION` which is 'pure long' value (e.g not in the int range of values)

  Parameters:
    `ordinal` - for which the association value is requested
  Returns:
    the associated int value (encapsulated in a long) if the ordinal had an associated value, or `NO_ASSOCIATION` otherwise

### getAssociatedOrdinals

    public IntIterator getAssociatedOrdinals()

  Get an iterator over the ordinals which has an association for the document set by `setNextDoc(int)`.

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Object`

### equals

    public boolean equals(Object obj)

  Overrides:
    `equals` in class `Object`

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