Examples with Item com.yahoo.prelude.query.Item used on opensource projects

Example 66 with Item

use of com.yahoo.prelude.query.Item in project vespa by vespa-engine.

the class QueryRewrite method rewriteSddocname.

/**
 * Replaces and {@link SimpleIndexedItem} searching in the {@link Hit#SDDOCNAME_FIELD} with an item
 * appropriate for the search node.
 */
public static void rewriteSddocname(Query query) {
    Item oldRoot = query.getModel().getQueryTree().getRoot();
    Item newRoot = rewriteSddocname(oldRoot);
    if (oldRoot != newRoot) {
        query.getModel().getQueryTree().setRoot(newRoot);
    }
}

Example 67 with Item

use of com.yahoo.prelude.query.Item in project vespa by vespa-engine.

the class QueryRewrite method collapseSingleComposites.

private static Item collapseSingleComposites(Item item) {
    if (!(item instanceof CompositeItem)) {
        return item;
    }
    CompositeItem parent = (CompositeItem) item;
    int numChildren = parent.getItemCount();
    for (int i = 0; i < numChildren; ++i) {
        Item oldChild = parent.getItem(i);
        Item newChild = collapseSingleComposites(oldChild);
        if (oldChild != newChild) {
            parent.setItem(i, newChild);
        }
    }
    return numChildren == 1 ? parent.getItem(0) : item;
}

Example 68 with Item

use of com.yahoo.prelude.query.Item in project vespa by vespa-engine.

the class QueryRewrite method extractAndNot.

private static CompositeItem extractAndNot(AndItem parent) {
    NotItem theOnlyNot = null;
    for (int i = 0; i < parent.getItemCount(); i++) {
        Item child = parent.getItem(i);
        if (child instanceof NotItem) {
            NotItem thisNot = (NotItem) child;
            parent.setItem(i, thisNot.getPositiveItem());
            if (theOnlyNot == null) {
                theOnlyNot = thisNot;
                theOnlyNot.setPositiveItem(parent);
            } else {
                for (int j = 1; j < thisNot.getItemCount(); j++) {
                    theOnlyNot.addNegativeItem(thisNot.getItem(j));
                }
            }
        }
    }
    return (theOnlyNot != null) ? theOnlyNot : parent;
}

Example 69 with Item

use of com.yahoo.prelude.query.Item in project vespa by vespa-engine.

the class CJKSearcher method transform.

private Item transform(Item root) {
    if (root instanceof PhraseItem) {
        PhraseItem asPhrase = (PhraseItem) root;
        if (asPhrase.isExplicit() || hasOverlappingTokens(asPhrase))
            return root;
        AndItem replacement = new AndItem();
        for (ListIterator<Item> i = ((CompositeItem) root).getItemIterator(); i.hasNext(); ) {
            Item item = i.next();
            if (item instanceof WordItem)
                replacement.addItem(item);
            else if (item instanceof PhraseSegmentItem) {
                replacement.addItem(new AndSegmentItem((PhraseSegmentItem) item));
            } else
                // should never run, but hey... just convert and hope it's OK :)
                replacement.addItem(item);
        }
        return replacement;
    } else if (root instanceof PhraseSegmentItem) {
        PhraseSegmentItem asSegment = (PhraseSegmentItem) root;
        if (asSegment.isExplicit() || hasOverlappingTokens(asSegment))
            return root;
        else
            return new AndSegmentItem(asSegment);
    } else if (root instanceof SegmentItem) {
        // avoid descending into AndSegmentItems and similar
        return root;
    } else if (root instanceof CompositeItem) {
        for (ListIterator<Item> i = ((CompositeItem) root).getItemIterator(); i.hasNext(); ) {
            Item item = i.next();
            Item transformedItem = transform(item);
            if (item != transformedItem) {
                i.set(transformedItem);
            }
        }
        return root;
    }
    return root;
}

Example 70 with Item

use of com.yahoo.prelude.query.Item in project vespa by vespa-engine.

the class ReferenceTermProduction method replaceMatches.

public void replaceMatches(RuleEvaluation e, ReferencedMatches referencedMatches) {
    Item referencedItem = referencedMatches.toItem(getLabel());
    if (referencedItem == null)
        return;
    e.removeMatches(referencedMatches);
    insertMatch(e, referencedMatches.matchIterator().next(), referencedItem, 0);
}