AbstractCatalogVisitor.java
/*
* SPDX-FileCopyrightText: none
* SPDX-License-Identifier: CC0-1.0
*/
package gov.nist.secauto.oscal.lib.model.control.catalog;
import gov.nist.secauto.metaschema.core.util.CollectionUtil;
import gov.nist.secauto.metaschema.core.util.ObjectUtils;
import gov.nist.secauto.oscal.lib.model.Catalog;
import gov.nist.secauto.oscal.lib.model.CatalogGroup;
import gov.nist.secauto.oscal.lib.model.Control;
import gov.nist.secauto.oscal.lib.model.Parameter;
import java.util.Objects;
import edu.umd.cs.findbugs.annotations.NonNull;
public abstract class AbstractCatalogVisitor<RESULT, CONTEXT> implements ICatalogVisitor<RESULT, CONTEXT> {
/**
* Get a new initial/default result for the visitor.
*
* @return the result
*/
protected abstract RESULT defaultResult();
/**
* Aggregate two results into one.
*
* @param previous
* the first result
* @param current
* the next result
* @return the result produced by combining the two results
*/
protected RESULT aggregateResult(RESULT previous, RESULT current) {
return current;
}
@Override
public RESULT visitCatalog(Catalog catalog, CONTEXT context) {
RESULT result = CollectionUtil.listOrEmpty(catalog.getGroups()).stream()
.filter(Objects::nonNull)
.map(childGroup -> visitGroup(ObjectUtils.notNull(childGroup), context))
.reduce(defaultResult(), this::aggregateResult);
result = CollectionUtil.listOrEmpty(catalog.getControls()).stream()
.filter(Objects::nonNull)
.map(childControl -> visitControl(ObjectUtils.notNull(childControl), context))
.reduce(result, this::aggregateResult);
return CollectionUtil.listOrEmpty(catalog.getParams()).stream()
.filter(Objects::nonNull)
.map(childParameter -> visitParameter(ObjectUtils.notNull(childParameter), context))
.reduce(result, this::aggregateResult);
}
@Override
public RESULT visitGroup(@NonNull CatalogGroup group, CONTEXT context) {
RESULT result = CollectionUtil.listOrEmpty(group.getGroups()).stream()
.filter(Objects::nonNull)
.map(childGroup -> visitGroup(ObjectUtils.notNull(childGroup), context))
.reduce(defaultResult(), this::aggregateResult);
result = CollectionUtil.listOrEmpty(group.getControls()).stream()
.filter(Objects::nonNull)
.map(childControl -> visitControl(ObjectUtils.notNull(childControl), context))
.reduce(result, this::aggregateResult);
return CollectionUtil.listOrEmpty(group.getParams()).stream()
.filter(Objects::nonNull)
.map(childParameter -> visitParameter(ObjectUtils.notNull(childParameter), context))
.reduce(result, this::aggregateResult);
}
@Override
public RESULT visitControl(Control control, CONTEXT context) {
RESULT result = CollectionUtil.listOrEmpty(control.getControls()).stream()
.filter(Objects::nonNull)
.map(childControl -> visitControl(ObjectUtils.notNull(childControl), context))
.reduce(defaultResult(), this::aggregateResult);
return CollectionUtil.listOrEmpty(control.getParams()).stream()
.filter(Objects::nonNull)
.map(childParameter -> visitParameter(ObjectUtils.notNull(childParameter), context))
.reduce(result, this::aggregateResult);
}
@Override
public RESULT visitParameter(Parameter parameter, CONTEXT context) {
return defaultResult();
}
}