Package com.yahoo.prelude.query

Class WeakAndItem

  • All Implemented Interfaces:
    Cloneable
    public final class WeakAndItem
extends NonReducibleCompositeItem
    Weak And of a collection of sub-expressions: this behaves like an OR unless many hits are returned and then it starts acting more like an AND. Alternately it can be viewed as an n-of-m operator where n is 1 at first and then increases gradually to m as more hits are seen.
    Author:
    arnej27959

    • Field Detail

      • defaultN

        public static final int defaultN
        The default N used if none is specified: 100
        See Also:
        Constant Field Values

    • Constructor Detail

      • WeakAndItem

        public WeakAndItem()
        Creates a WAND item with default N

      • WeakAndItem

        public WeakAndItem​(int N)

      • WeakAndItem

        public WeakAndItem​(String index,
                   int n)
        Make a WeakAnd item with no children. You can mention a common index or you can mention it on each child.
        Parameters:
        index - the index to search
        n - the target for minimum number of hits to produce; a backend will not suppress any hits in the operator until N hits have been produced.

    • Method Detail

      • getItemType

        public Item.ItemType getItemType()
        Description copied from class: Item
        Return the enumerated type of this item.
        Specified by:
        getItemType in class Item

      • getName

        public String getName()
        Description copied from class: Item
        Returns the name of this item
        Specified by:
        getName in class Item

      • setIndexName

        public void setIndexName​(String index)
        Sets the default index name to apply to all child items of this. This is useful in conjunction with using PureWeightedItems as children.
        Overrides:
        setIndexName in class CompositeItem

      • getIndexName

        public String getIndexName()
        Returns the index name set for this, or null if none.

      • appendHeadingString

        protected void appendHeadingString​(StringBuilder buffer)
        Appends the heading of this string - [getName()]([limit])
        Overrides:
        appendHeadingString in class Item

      • getN

        public int getN()

      • setN

        public void setN​(int N)

      • getScoreThreshold

        @Deprecated
public int getScoreThreshold()
        Deprecated.

      • setScoreThreshold

        @Deprecated
public void setScoreThreshold​(int scoreThreshold)
        Deprecated.
        has no effect
        Noop.

      • equals

        public boolean equals​(Object object)
        Returns whether this item is of the same class and contains the same state as the given item.
        Overrides:
        equals in class CompositeItem