AbstractBinaryExpression.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
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* extent that NIST may hold copyright, to use, copy, modify, create derivative
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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 representation of an {@link IExpression} that has two
* sub-expression children.
*
* @param <L>
* the type of the left expression
* @param <R>
* the type of the right expression
*/
abstract class AbstractBinaryExpression<L extends IExpression, R extends IExpression>
extends AbstractExpression {
@NonNull
private final L left;
@NonNull
private final R right;
/**
* Construct a new binary expression.
*
* @param left
* the first sub-expression to evaluate
* @param right
* the second sub-expression to evaluate
*/
public AbstractBinaryExpression(@NonNull L left, @NonNull R right) {
this.left = Objects.requireNonNull(left);
this.right = Objects.requireNonNull(right);
}
/**
* Retrieve the first sub-expression.
*
* @return the first sub-expression
*/
@NonNull
public L getLeft() {
return left;
}
/**
* Retrieve the second sub-expression.
*
* @return the second sub-expression
*/
@NonNull
public R getRight() {
return right;
}
@SuppressWarnings("null")
@Override
public List<? extends IExpression> getChildren() {
return List.of(left, right);
}
}