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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.select.rule;
import com.yahoo.document.BucketIdFactory;
import com.yahoo.document.select.BucketSet;
import com.yahoo.document.select.Context;
import com.yahoo.document.select.Visitor;
/**
* The interface of all expression nodes. It declares the methods requires by all expression nodes to maintain
* a working document selector language.
*
* @author Simon Thoresen Hult
*/
public interface ExpressionNode {
/**
* Evaluate the content of this node based on document object, and return that value.
*
* @param doc the document to evaluate over
* @return the value of this
*/
Object evaluate(Context doc);
/**
* Returns the set of bucket ids covered by this node.
*
* @param factory the factory used by the current application
*/
BucketSet getBucketSet(BucketIdFactory factory);
/**
* Perform visitation of this node.
*
* @param visitor the visitor that wishes to visit the node
*/
void accept(Visitor visitor);
}
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