Metapath.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
* copyright. Permission in the United States and in foreign countries, to the
* extent that NIST may hold copyright, to use, copy, modify, create derivative
* works, and distribute this software and its documentation without fee is hereby
* granted on a non-exclusive basis, provided that this notice and disclaimer
* 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
* SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
* INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
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package gov.nist.secauto.metaschema.core.metapath;
import gov.nist.secauto.metaschema.core.metapath.item.IItem;
import gov.nist.secauto.metaschema.core.util.ObjectUtils;
import java.util.List;
import java.util.stream.Stream;
import edu.umd.cs.findbugs.annotations.NonNull;
class Metapath
extends AbstractNAryExpression {
@NonNull
private final Class<? extends IItem> staticResultType;
/**
* Create a new internal metapath expression.
*
* @param expressions
* the expressions to evaluate
*/
public Metapath(@NonNull List<IExpression> expressions) {
super(expressions);
this.staticResultType = ExpressionUtils.analyzeStaticResultType(IItem.class, expressions);
}
@Override
public Class<? extends IItem> getStaticResultType() {
return staticResultType;
}
@Override
public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
return visitor.visitMetapath(this, context);
}
@Override
public ISequence<?> accept(DynamicContext dynamicContext, ISequence<?> focus) {
Stream<? extends IItem> retval = ObjectUtils.notNull(getChildren().stream()
.flatMap(child -> {
ISequence<?> result = child.accept(dynamicContext, focus);
return result.asStream();
}));
return ISequence.of(retval);
}
}