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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.semantics.engine;
import com.yahoo.prelude.query.CompositeItem;
import com.yahoo.prelude.query.Item;
import com.yahoo.prelude.query.TermItem;
import com.yahoo.prelude.query.WordItem;
import java.util.Objects;
/**
* A match
*
* @author bratseth
*/
public class Match {
/** The start position of this match */
private final int position;
private final TermItem item;
/** The string to replace the match by, usually item.getIndexedString() */
private final String replaceValue;
/** The parent of the matched item */
private final CompositeItem parent;
/**
* Creates a match
*
* @param item the match to add
* @param replaceValue the string to replace this match by, usually the item.getIndexedString()
* which is what the replace value will be if it is passed as null here
*/
public Match(FlattenedItem item, String replaceValue) {
this.item = item.getItem();
if (replaceValue == null)
this.replaceValue = item.getItem().getIndexedString();
else
this.replaceValue = replaceValue;
this.parent = this.item.getParent();
this.position = item.getPosition();
}
public int getPosition() { return position; }
public TermItem getItem() { return item; }
public String getReplaceValue() {
return replaceValue;
}
/**
* Returns the parent in which the item was matched, or null if the item was root.
* Note that the item may subsequently have been removed, so it does not necessarily
* have this parent
*/
public CompositeItem getParent() { return parent; }
/** Returns a new item representing this match */
public Item toItem(String label) {
return toItem(label, getReplaceValue());
}
/** Returns a new item representing this match */
public Item toItem(String label, String term) {
var newItem = new WordItem(term, label);
newItem.setWeight(item.getWeight());
return newItem;
}
@Override
public int hashCode() {
return Objects.hash(item.getIndexedString(), item.getIndexName());
}
@Override
public boolean equals(Object o) {
if (! (o instanceof Match)) return false;
Match other = (Match)o;
if (other.position != position) return false;
if ( ! other.item.equals(item)) return false;
return true;
}
@Override
public String toString() {
return "match of " + item + " at " + position + " to be replaced by " + replaceValue;
}
}
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