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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.query;
import com.yahoo.protect.Validator;
import java.util.Collection;
/**
* An Item where each child is an <i>alternative</i> which can be matched.
* Produces the same recall as Or, but differs in that the relevance of a match
* does not increase if more than one children is matched: With Equiv, matching one child perfectly is a perfect match.
* <p>
* This can only have Word, Int or Phrase children.
*
* @author <a href="mailto:havardpe@yahoo-inc.com">havardpe</a>
*/
public class EquivItem extends CompositeTaggableItem {
public ItemType getItemType() {
return ItemType.EQUIV;
}
public String getName() {
return "EQUIV";
}
@Override
protected void adding(Item item) {
super.adding(item);
Validator.ensure("Equiv can only have word/int/phrase as children",
item.getItemType() == ItemType.WORD ||
item.getItemType() == ItemType.INT ||
item.getItemType() == ItemType.PHRASE);
}
/** make an EQUIV item with no children */
public EquivItem() {}
/**
* create an EQUIV with the given item as child.
* The new EQUIV will take connectivity,
* significance and weight from the given item.
*
* @param item Will be modified and added as a child.
**/
public EquivItem(Item item) {
addItem(item);
// steal other item's connectivity:
if (item.connectedItem != null) {
setConnectivity(item.connectedItem, item.connectivity);
item.connectedItem = null;
item.connectivity = 0.0;
}
TaggableItem back = (TaggableItem)item.connectedBacklink;
if (back != null) {
back.setConnectivity(this, back.getConnectivity());
item.connectedBacklink = null;
}
// steal other item's significance:
if (item.explicitSignificance) {
setSignificance(item.significance);
}
// steal other item's weight:
setWeight(item.getWeight());
// we have now stolen all of the other item's unique id needs:
item.setHasUniqueID(false);
}
/**
* create an EQUIV with the given item and a set
* of alternate words as children.
* The new EQUIV will take connectivity,
* significance and weight from the given item.
*
* @param item Will be modified and added as a child.
* @param words Set of words to create WordItems from.
**/
public EquivItem(Item item, Collection<String> words) {
this(item);
String idx = ((IndexedItem)item).getIndexName();
for (String word : words) {
WordItem witem = new WordItem(word, idx);
addItem(witem);
}
}
}
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