org.apache.lucene.search.suggest

## Class DocumentDictionary

- java.lang.Object
- - org.apache.lucene.search.suggest.DocumentDictionary

- All Implemented Interfaces:
    Dictionary
  Direct Known Subclasses:
    DocumentValueSourceDictionary

      public class DocumentDictionary
      extends Object
      implements Dictionary

  Dictionary with terms, weights, payload (optional) and contexts (optional) information taken from stored/indexed fields in a Lucene index.

  NOTE:
  - The term field has to be stored; if it is missing, the document is skipped.
  - The payload and contexts field are optional and are not required to be stored.
  - The weight field can be stored or can be a `NumericDocValues`. If the weight field is not defined, the value of the weight is `0`

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `protected class` | `DocumentDictionary.DocumentInputIterator` Implements `InputIterator` from stored fields.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected String` | `contextsField` Field to read contexts from
    `protected String` | `payloadField` Field to read payload from
    `protected IndexReader` | `reader` `IndexReader` to load documents from

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DocumentDictionary(IndexReader reader, String field, String weightField)` Creates a new dictionary with the contents of the fields named `field` for the terms and `weightField` for the weights that will be used for the corresponding terms.
    `DocumentDictionary(IndexReader reader, String field, String weightField, String payloadField)` Creates a new dictionary with the contents of the fields named `field` for the terms, `weightField` for the weights that will be used for the the corresponding terms and `payloadField` for the corresponding payloads for the entry.
    `DocumentDictionary(IndexReader reader, String field, String weightField, String payloadField, String contextsField)` Creates a new dictionary with the contents of the fields named `field` for the terms, `weightField` for the weights that will be used for the the corresponding terms, `payloadField` for the corresponding payloads for the entry and `contextsField` for associated contexts.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `InputIterator` | `getEntryIterator()` Returns an iterator over all the entries

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

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

- - ### Field Detail

    - #### reader

          protected final IndexReader reader

      `IndexReader` to load documents from

    - #### payloadField

          protected final String payloadField

      Field to read payload from

    - #### contextsField

          protected final String contextsField

      Field to read contexts from

  - ### Constructor Detail

    - #### DocumentDictionary

          public DocumentDictionary(IndexReader reader,
                                    String field,
                                    String weightField)

      Creates a new dictionary with the contents of the fields named `field` for the terms and `weightField` for the weights that will be used for the corresponding terms.

    - #### DocumentDictionary

          public DocumentDictionary(IndexReader reader,
                                    String field,
                                    String weightField,
                                    String payloadField)

      Creates a new dictionary with the contents of the fields named `field` for the terms, `weightField` for the weights that will be used for the the corresponding terms and `payloadField` for the corresponding payloads for the entry.

    - #### DocumentDictionary

          public DocumentDictionary(IndexReader reader,
                                    String field,
                                    String weightField,
                                    String payloadField,
                                    String contextsField)

      Creates a new dictionary with the contents of the fields named `field` for the terms, `weightField` for the weights that will be used for the the corresponding terms, `payloadField` for the corresponding payloads for the entry and `contextsField` for associated contexts.

  - ### Method Detail

    - #### getEntryIterator

          public InputIterator getEntryIterator()
                                         throws IOException

      Description copied from interface: `Dictionary`
      Returns an iterator over all the entries
      Specified by:
        `getEntryIterator` in interface `Dictionary`
      Returns:
        Iterator
      Throws:
        `IOException`

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