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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.grouping.request;
/**
* This is the abstract super class of both {@link GroupingOperation} and {@link GroupingExpression}. All nodes can be
* assigned a {@link String} label which in turn can be used to identify the corresponding result objects.
*
* @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
*/
public abstract class GroupingNode {
private final String image;
private String label = null;
protected GroupingNode(String image) {
this.image = image;
}
/**
* Returns the label assigned to this grouping expression.
*
* @return The label string.
*/
public String getLabel() {
return label;
}
/**
* Assigns a label to this grouping expression. The label is applied to the results of this expression so that they
* can be identified by the caller when processing the output.
*
* @param str The label to assign to this.
* @return This, to allow chaining.
*/
public GroupingNode setLabel(String str) {
label = str;
return this;
}
@Override
public String toString() {
return image;
}
}
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