org.elasticsearch.index.query.support.NestedScope Maven / Gradle / Ivy
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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.index.query.support;
import org.elasticsearch.index.mapper.NestedObjectMapper;
import org.elasticsearch.index.mapper.ObjectMapper;
import java.util.Deque;
import java.util.LinkedList;
/**
* During query parsing this keeps track of the current nested level.
*/
public final class NestedScope {
private final Deque levelStack = new LinkedList<>();
/**
* @return For the current nested level returns the object mapper that belongs to that
*/
public NestedObjectMapper getObjectMapper() {
return levelStack.peek();
}
/**
* Sets the new current nested level and pushes old current nested level down the stack returns that level.
*/
public NestedObjectMapper nextLevel(NestedObjectMapper level) {
NestedObjectMapper previous = levelStack.peek();
levelStack.push(level);
return previous;
}
/**
* Sets the previous nested level as current nested level and removes and returns the current nested level.
*/
public ObjectMapper previousLevel() {
return levelStack.pop();
}
}