org.apache.lucene.search.vectorhighlight

## Class FieldTermStack

- java.lang.Object
- - org.apache.lucene.search.vectorhighlight.FieldTermStack

-     public class FieldTermStack
      extends Object

  `FieldTermStack` is a stack that keeps query terms in the specified field of the document to be highlighted.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `FieldTermStack.TermInfo` Single term with its position/offsets in the document and IDF weight

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `FieldTermStack(IndexReader reader, int docId, String fieldName, FieldQuery fieldQuery)` a constructor.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `String` | `getFieldName()`
    `boolean` | `isEmpty()` to know whether the stack is empty
    `FieldTermStack.TermInfo` | `pop()`
    `void` | `push(FieldTermStack.TermInfo termInfo)`

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

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

- - ### Constructor Detail

    - #### FieldTermStack

          public FieldTermStack(IndexReader reader,
                        int docId,
                        String fieldName,
                        FieldQuery fieldQuery)
                         throws IOException

      a constructor.
      Parameters:
        `reader` - IndexReader of the index
        `docId` - document id to be highlighted
        `fieldName` - field of the document to be highlighted
        `fieldQuery` - FieldQuery object
      Throws:
        `IOException` - If there is a low-level I/O error

  - ### Method Detail

    - #### getFieldName

          public String getFieldName()

      Returns:
        field name

    - #### pop

          public FieldTermStack.TermInfo pop()

      Returns:
        the top TermInfo object of the stack

    - #### push

          public void push(FieldTermStack.TermInfo termInfo)

      Parameters:
        `termInfo` - the TermInfo object to be put on the top of the stack

    - #### isEmpty

          public boolean isEmpty()

      to know whether the stack is empty
      Returns:
        true if the stack is empty, false if not

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