AbstractUnaryExpression.java
/*
* Portions of this software was developed by employees of the National Institute
* of Standards and Technology (NIST), an agency of the Federal Government and is
* being made available as a public service. Pursuant to title 17 United States
* Code Section 105, works of NIST employees are not subject to copyright
* protection in the United States. This software may be subject to foreign
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* extent that NIST may hold copyright, to use, copy, modify, create derivative
* works, and distribute this software and its documentation without fee is hereby
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* of warranty appears in all copies.
*
* THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
* EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
* THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
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* SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT
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package gov.nist.secauto.metaschema.core.metapath;
import java.util.List;
import java.util.Objects;
import edu.umd.cs.findbugs.annotations.NonNull;
/**
* An immutable expression with a single sub-expression.
*/
abstract class AbstractUnaryExpression
extends AbstractExpression {
@NonNull
private final IExpression expr;
/**
* Construct a new unary expression.
*
* @param expr
* the single sub-expression
*/
public AbstractUnaryExpression(@NonNull IExpression expr) {
this.expr = Objects.requireNonNull(expr, "expr");
}
/**
* Retrieve the single child sub-expression.
*
* @return the sub-expression
*/
@NonNull
public IExpression getChild() {
return expr;
}
@SuppressWarnings("null")
@Override
public List<? extends IExpression> getChildren() {
return List.of(expr);
}
}