DefaultCardinalityConstraint.java

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 * of Standards and Technology (NIST), an agency of the Federal Government and is
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 * of warranty appears in all copies.
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package gov.nist.secauto.metaschema.core.model.constraint;

import gov.nist.secauto.metaschema.core.datatype.markup.MarkupLine;
import gov.nist.secauto.metaschema.core.datatype.markup.MarkupMultiline;
import gov.nist.secauto.metaschema.core.metapath.MetapathExpression;
import gov.nist.secauto.metaschema.core.util.ObjectUtils;

import java.util.Map;
import java.util.Set;

import javax.xml.namespace.QName;

import edu.umd.cs.findbugs.annotations.NonNull;
import edu.umd.cs.findbugs.annotations.Nullable;

public final class DefaultCardinalityConstraint
    extends AbstractConstraint
    implements ICardinalityConstraint {
  @Nullable
  private final Integer minOccurs;
  @Nullable
  private final Integer maxOccurs;

  /**
   * Construct a new cardinality constraint which enforces that the number of
   * items matching the target fall within the inclusive range described by the
   * {@code minOccurs} or {@code maxOccurs} values.
   *
   * @param id
   *          the optional identifier for the constraint
   * @param formalName
   *          the constraint's formal name or {@code null} if not provided
   * @param description
   *          the constraint's semantic description or {@code null} if not
   *          provided
   * @param source
   *          information about the constraint source
   * @param level
   *          the significance of a violation of this constraint
   * @param target
   *          the Metapath expression identifying the nodes the constraint targets
   * @param properties
   *          a collection of associated properties
   * @param minOccurs
   *          if provided, the constraint ensures that the count of targets is at
   *          least this value
   * @param maxOccurs
   *          if provided, the constraint ensures that the count of targets is at
   *          most this value
   * @param remarks
   *          optional remarks describing the intent of the constraint
   */
  private DefaultCardinalityConstraint(
      @Nullable String id,
      @Nullable String formalName,
      @Nullable MarkupLine description,
      @NonNull ISource source,
      @NonNull Level level,
      @NonNull MetapathExpression target,
      @NonNull Map<QName, Set<String>> properties,
      @Nullable Integer minOccurs,
      @Nullable Integer maxOccurs,
      MarkupMultiline remarks) {
    super(id, formalName, description, source, level, target, properties, remarks);
    if (minOccurs == null && maxOccurs == null) {
      throw new IllegalArgumentException("at least one of minOccurs or maxOccurs must be provided");
    }
    this.minOccurs = minOccurs;
    this.maxOccurs = maxOccurs;
  }

  @Override
  public Integer getMinOccurs() {
    return minOccurs;
  }

  @Override
  public Integer getMaxOccurs() {
    return maxOccurs;
  }

  @Override
  public <T, R> R accept(IConstraintVisitor<T, R> visitor, T state) {
    return visitor.visitCardinalityConstraint(this, state);
  }

  @NonNull
  public static Builder builder() {
    return new Builder();
  }

  public static final class Builder
      extends AbstractConstraintBuilder<Builder, DefaultCardinalityConstraint> {
    private Integer minOccurs;
    private Integer maxOccurs;

    private Builder() {
      // disable construction
    }

    public Builder minOccurs(int value) {
      this.minOccurs = value;
      return this;
    }

    public Builder maxOccurs(int value) {
      this.maxOccurs = value;
      return this;
    }

    @Override
    protected Builder getThis() {
      return this;
    }

    @Override
    protected void validate() {
      super.validate();

      if (getMinOccurs() == null && getMaxOccurs() == null) {
        throw new IllegalStateException("At least one of minOccurs or maxOccurs must be provided.");
      }
    }

    protected Integer getMinOccurs() {
      return minOccurs;
    }

    protected Integer getMaxOccurs() {
      return maxOccurs;
    }

    @Override
    protected DefaultCardinalityConstraint newInstance() {
      return new DefaultCardinalityConstraint(
          getId(),
          getFormalName(),
          getDescription(),
          ObjectUtils.notNull(getSource()),
          getLevel(),
          getTarget(),
          getProperties(),
          getMinOccurs(),
          getMaxOccurs(),
          getRemarks());
    }
  }
}