MultiConstraint.java
- package org.opentrafficsim.base.parameters.constraint;
- import java.util.LinkedHashSet;
- import java.util.Set;
- /**
- * Constraint containing multiple constraints.
- * <p>
- * Copyright (c) 2013-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
- * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
- * </p>
- * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
- * @author <a href="https://github.com/peter-knoppers">Peter Knoppers</a>
- * @author <a href="https://github.com/wjschakel">Wouter Schakel</a>
- * @param <T> value type
- */
- public class MultiConstraint<T> implements Constraint<T>
- {
- /** Set of constraints. */
- private final Set<Constraint<? super T>> constraints;
- /** Message of the latest failed constrained. */
- private String failedConstraintMessage = null;
- /** String representation. */
- private final String stringRepresentation;
- /**
- * Creates a {@code MultiConstraint} from given constraints.
- * @param constraints constraints
- * @param <T> value type
- * @return {@code MultiConstraint}
- */
- @SafeVarargs
- public static final <T> MultiConstraint<T> create(final Constraint<? super T>... constraints)
- {
- Set<Constraint<? super T>> set = new LinkedHashSet<>();
- for (Constraint<? super T> constraint : constraints)
- {
- set.add(constraint);
- }
- return new MultiConstraint<>(set);
- }
- /**
- * Constructor.
- * @param constraints constraints
- */
- public MultiConstraint(final Set<Constraint<? super T>> constraints)
- {
- this.constraints = constraints;
- this.stringRepresentation = String.format("MultiConstraint [contains %d constraints]", this.constraints.size());
- }
- @Override
- public boolean accept(final T value)
- {
- for (Constraint<? super T> constraint : this.constraints)
- {
- if (!constraint.accept(value))
- {
- this.failedConstraintMessage = constraint.failMessage();
- return false;
- }
- }
- return true;
- }
- @Override
- public String failMessage()
- {
- if (this.failedConstraintMessage == null)
- {
- return "A constraint failed for parameter '%s'.";
- }
- // note that we do not synchronize, nor can't we be assured that after accept()=false, this method is (directly) invoked
- return "A constraint failed, most likely: " + this.failedConstraintMessage;
- }
- @Override
- public String toString()
- {
- return this.stringRepresentation;
- }
- }