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## org.apache.lucene.index
Class TermContext

    java.lang.Object
      org.apache.lucene.index.TermContext

    public final class TermContext

extends Object

Maintains a `IndexReader` `TermState` view over `IndexReader` instances containing a single term. The `TermContext` doesn't track if the given `TermState` objects are valid, neither if the `TermState` instances refer to the same terms in the associated readers.

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

Field Summary
`IndexReaderContext` | `topReaderContext` Holds the `IndexReaderContext` of the top-level `IndexReader`, used internally only for asserting.

Constructor Summary
`TermContext(IndexReaderContext context)` Creates an empty `TermContext` from a `IndexReaderContext`
`TermContext(IndexReaderContext context, TermState state, int ord, int docFreq, long totalTermFreq)` Creates a `TermContext` with an initial `TermState`, `IndexReader` pair.

Method Summary
`static TermContext` | `build(IndexReaderContext context, Term term, boolean cache)` Creates a `TermContext` from a top-level `IndexReaderContext` and the given `Term`.
`void` | `clear()` Clears the `TermContext` internal state and removes all registered `TermState`s
`int` | `docFreq()` Returns the accumulated document frequency of all `TermState` instances passed to `register(TermState, int, int, long)`.
`TermState` | `get(int ord)` Returns the `TermState` for an leaf ordinal or `null` if no `TermState` for the ordinal was registered.
`void` | `register(TermState state, int ord, int docFreq, long totalTermFreq)` Registers and associates a `TermState` with an leaf ordinal.
`void` | `setDocFreq(int docFreq)` expert: only available for queries that want to lie about docfreq
`long` | `totalTermFreq()` Returns the accumulated term frequency of all `TermState` instances passed to `register(TermState, int, int, long)`.

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

Field Detail

### topReaderContext

    public final IndexReaderContext topReaderContext

  Holds the `IndexReaderContext` of the top-level `IndexReader`, used internally only for asserting.

  NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

Constructor Detail

### TermContext

    public TermContext(IndexReaderContext context)

  Creates an empty `TermContext` from a `IndexReaderContext`

### TermContext

    public TermContext(IndexReaderContext context,
                       TermState state,
                       int ord,
                       int docFreq,
                       long totalTermFreq)

  Creates a `TermContext` with an initial `TermState`, `IndexReader` pair.

Method Detail

### build

    public static TermContext build(IndexReaderContext context,
                                    Term term,
                                    boolean cache)
                             throws IOException

  Creates a `TermContext` from a top-level `IndexReaderContext` and the given `Term`. This method will lookup the given term in all context's leaf readers and register each of the readers containing the term in the returned `TermContext` using the leaf reader's ordinal.

  Note: the given context must be a top-level context.

  Throws:
    `IOException`

### clear

    public void clear()

  Clears the `TermContext` internal state and removes all registered `TermState`s

### register

    public void register(TermState state,
                         int ord,
                         int docFreq,
                         long totalTermFreq)

  Registers and associates a `TermState` with an leaf ordinal. The leaf ordinal should be derived from a `IndexReaderContext`'s leaf ord.

### get

    public TermState get(int ord)

  Returns the `TermState` for an leaf ordinal or `null` if no `TermState` for the ordinal was registered.

  Parameters:
    `ord` - the readers leaf ordinal to get the `TermState` for.
  Returns:
    the `TermState` for the given readers ord or `null` if no `TermState` for the reader was registered

### docFreq

    public int docFreq()

  Returns the accumulated document frequency of all `TermState` instances passed to `register(TermState, int, int, long)`.

  Returns:
    the accumulated document frequency of all `TermState` instances passed to `register(TermState, int, int, long)`.

### totalTermFreq

    public long totalTermFreq()

  Returns the accumulated term frequency of all `TermState` instances passed to `register(TermState, int, int, long)`.

  Returns:
    the accumulated term frequency of all `TermState` instances passed to `register(TermState, int, int, long)`.

### setDocFreq

    public void setDocFreq(int docFreq)

  expert: only available for queries that want to lie about docfreq

  NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

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