NonReducibleCompositeItem (container-search 7.374.52 API)

java.lang.Object
- com.yahoo.prelude.query.Item
- - com.yahoo.prelude.query.CompositeItem
  - - com.yahoo.prelude.query.NonReducibleCompositeItem

All Implemented Interfaces:

java.lang.Cloneable

Direct Known Subclasses:

SameElementItem, WeakAndItem
```
public abstract class NonReducibleCompositeItem
extends CompositeItem
```
A composite item which specifies semantics which are not maintained if an instance with a single child is replaced by the single child.
Most composites, like AND and OR, are reducible as e.g (AND a) is semantically equal to (a).
This type functions as a marker type for query rewriters.

Author:

bratseth

Nested Class Summary
- Nested classes/interfaces inherited from class com.yahoo.prelude.query.Item
  Item.ItemCreator, Item.ItemType

Field Summary
- Fields inherited from class com.yahoo.prelude.query.Item
  connectedBacklink, connectedItem, connectivity, DEFAULT_WEIGHT, explicitSignificance, significance, uniqueID

Constructor Summary

Constructors
Constructor Description

NonReducibleCompositeItem()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.util.Optional<Item>`	`extractSingleChild()`	Will return its single child if itself can safely be omitted.

Methods inherited from class com.yahoo.prelude.query.CompositeItem
adding, addItem, addItem, appendBodyString, clone, disclose, encode, encodeThis, encodingArity, ensureNotInSubtree, equals, getItem, getItemCount, getItemIndex, getItemIterator, getTermCount, hashCode, isLocked, items, lock, removeItem, removeItem, setIndexName, setItem, shouldParenthize

Methods inherited from class com.yahoo.prelude.query.Item
addAnnotation, appendHeadingString, getAnnotation, getBytes, getCode, getCreator, getItemType, getLabel, getLanguage, getName, getParent, getWeight, hasAnnotation, hasConnectivityBackLink, hasUniqueID, isFilter, isFromSpecialToken, isProtected, isRanked, isRoot, putBytes, putString, setCreator, setFilter, setFromSpecialToken, setHasUniqueID, setLabel, setLanguage, setParent, setPositionData, setProtected, setRanked, setWeight, toString, usePositionData

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

- Constructor Detail
  - NonReducibleCompositeItem
```
public NonReducibleCompositeItem()
```
- Method Detail
  - extractSingleChild
```
public java.util.Optional<Item> extractSingleChild()
```
    Description copied from class: CompositeItem
    
    Will return its single child if itself can safely be omitted.
    
    Overrides:
    
    extractSingleChild in class CompositeItem
    
    Returns:
    
    a valid Item or empty Optional if it can not be done