/*
* Copyright (C) 2011 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the
* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.collect;
import com.google.common.annotations.GwtCompatible;
import javax.annotation.Nullable;
/**
* An integer-valued function on binary search tree nodes that adds between nodes.
*
* @author Louis Wasserman
*/
@GwtCompatible
interface BstAggregate<N extends BstNode<?, N>> {
/**
* The total value on an entire subtree. Must be equal to the sum of the {@link #entryValue
* entryValue} of this node and all its descendants.
*/
int treeValue(@Nullable N tree);
/**
* The value on a single entry, ignoring its descendants.
*/
int entryValue(N entry);
}
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