NotValuesIn.java

/*******************************************************************************
 * Copyright (c) 2020 Eclipse RDF4J contributors.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Distribution License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *******************************************************************************/

package org.eclipse.rdf4j.sail.shacl.ast.planNodes;

import java.util.Collections;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;

import org.apache.commons.text.StringEscapeUtils;
import org.eclipse.rdf4j.common.iteration.CloseableIteration;
import org.eclipse.rdf4j.model.Value;
import org.eclipse.rdf4j.sail.shacl.wrapper.data.ConnectionsGroup;

public class NotValuesIn implements PlanNode {

	private final PlanNode parent;
	private final PlanNode notIn;
	private boolean printed = false;
	private ValidationExecutionLogger validationExecutionLogger;

	public NotValuesIn(PlanNode parent, PlanNode notIn, ConnectionsGroup connectionsGroup) {
		this.parent = PlanNodeHelper.handleSorting(this, parent, connectionsGroup);
		this.notIn = notIn;
	}

	@Override
	public CloseableIteration<? extends ValidationTuple> iterator() {

		return new LoggingCloseableIteration(this, validationExecutionLogger) {

			private CloseableIteration<? extends ValidationTuple> parentIterator;
			Set<Value> notInValueSet;
			ValidationTuple next;

			@Override
			protected void init() {
				assert notInValueSet == null;

				parentIterator = parent.iterator();

				if (!parentIterator.hasNext()) {
					notInValueSet = Set.of();
				} else {
					notInValueSet = new HashSet<>();

					try (CloseableIteration<? extends ValidationTuple> iterator = notIn.iterator()) {
						while (iterator.hasNext()) {
							notInValueSet.add(iterator.next().getValue());
						}
					}
					if (notInValueSet.isEmpty()) {
						notInValueSet = Collections.emptySet();
					}
				}

			}

			void calculateNext() {
				while (next == null && parentIterator.hasNext()) {
					ValidationTuple temp = parentIterator.next();
					if (!notInValueSet.contains(temp.getValue())) {
						next = temp;
					}

				}

			}

			@Override
			protected ValidationTuple loggingNext() {
				calculateNext();
				ValidationTuple temp = next;
				next = null;
				return temp;
			}

			@Override
			protected boolean localHasNext() {
				calculateNext();

				return next != null;
			}

			@Override
			public void localClose() {
				if (parentIterator != null) {
					parentIterator.close();
				}
			}

		};
	}

	@Override
	public int depth() {
		return parent.depth() + 1;
	}

	@Override
	public void getPlanAsGraphvizDot(StringBuilder stringBuilder) {
		if (printed) {
			return;
		}
		printed = true;
		stringBuilder.append(getId())
				.append(" [label=\"")
				.append(StringEscapeUtils.escapeJava(this.toString()))
				.append("\"];")
				.append("\n");

		stringBuilder.append(parent.getId() + " -> " + getId()).append("\n");
		stringBuilder.append(notIn.getId() + " -> " + getId()).append("\n");
		parent.getPlanAsGraphvizDot(stringBuilder);
		notIn.getPlanAsGraphvizDot(stringBuilder);

	}

	@Override
	public String getId() {
		return System.identityHashCode(this) + "";
	}

	@Override
	public String toString() {
		return "NotValuesIn";
	}

	@Override
	public void receiveLogger(ValidationExecutionLogger validationExecutionLogger) {
		this.validationExecutionLogger = validationExecutionLogger;
		parent.receiveLogger(validationExecutionLogger);
		notIn.receiveLogger(validationExecutionLogger);
	}

	@Override
	public boolean producesSorted() {
		return parent.producesSorted();
	}

	@Override
	public boolean requiresSorted() {
		return false;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o == null || getClass() != o.getClass()) {
			return false;
		}
		NotValuesIn that = (NotValuesIn) o;
		return parent.equals(that.parent) && notIn.equals(that.notIn);
	}

	@Override
	public int hashCode() {
		return Objects.hash(parent, notIn);
	}
}