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

Example 1 with Item

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

the class CollapsePhraseSearcher method search.

public Result search(Query query, Execution execution) {
    QueryTree tree = query.getModel().getQueryTree();
    Item root = tree.getRoot();
    if (root != null) {
        Item newRoot = root.clone();
        newRoot = simplifyPhrases(newRoot);
        // to make code nicer if the root is a single term phrase
        if (!root.equals(newRoot)) {
            tree.setRoot(newRoot);
            query.trace("Collapsing single term phrases to single terms", true, 2);
        }
    }
    return execution.search(query);
}

Example 2 with Item

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

the class CollapsePhraseSearcher method simplifyPhrases.

private Item simplifyPhrases(Item root) {
    if (root == null) {
        return root;
    } else if (root instanceof PhraseItem) {
        return collapsePhrase((PhraseItem) root);
    } else if (root instanceof CompositeItem) {
        CompositeItem composite = (CompositeItem) root;
        ListIterator<Item> i = composite.getItemIterator();
        while (i.hasNext()) {
            Item original = i.next();
            Item transformed = simplifyPhrases(original);
            if (original != transformed)
                i.set(transformed);
        }
        return root;
    } else {
        return root;
    }
}

Example 3 with Item

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

the class QueryRewrite method rewriteSddocname.

private static Item rewriteSddocname(Item item) {
    if (item instanceof CompositeItem) {
        CompositeItem parent = (CompositeItem) item;
        for (int i = 0, len = parent.getItemCount(); i < len; ++i) {
            Item oldChild = parent.getItem(i);
            Item newChild = rewriteSddocname(oldChild);
            if (oldChild != newChild) {
                parent.setItem(i, newChild);
            }
        }
    } else if (item instanceof SimpleIndexedItem) {
        SimpleIndexedItem oldItem = (SimpleIndexedItem) item;
        if (Hit.SDDOCNAME_FIELD.equals(oldItem.getIndexName())) {
            SubstringItem newItem = new SubstringItem(oldItem.getIndexedString());
            newItem.setIndexName("[documentmetastore]");
            return newItem;
        }
    }
    return item;
}

Example 4 with Item

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

the class QueryRewrite method optimizeAndNot.

// ------------------- Start public API
/**
 * Optimize multiple NotItems under and or by collapsing them in to one and leaving
 * the positive ones behind in its place and moving itself with the original and as its positive item
 * and the union of all the negative items of all the original NotItems as its negative items.
 */
public static void optimizeAndNot(Query query) {
    Item root = query.getModel().getQueryTree().getRoot();
    Item possibleNewRoot = optimizeAndNot(root);
    if (root != possibleNewRoot) {
        query.getModel().getQueryTree().setRoot(possibleNewRoot);
    }
}

Example 5 with Item

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

the class QueryRewrite method collapseSingleComposites.

/**
 * Collapses all single-child {@link CompositeItem}s into their parent item.
 */
public static void collapseSingleComposites(Query query) {
    Item oldRoot = query.getModel().getQueryTree().getRoot();
    Item newRoot = collapseSingleComposites(oldRoot);
    if (oldRoot != newRoot) {
        query.getModel().getQueryTree().setRoot(newRoot);
    }
}