AbstractKeyConstraint.java

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 * 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
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 * extent that NIST may hold copyright, to use, copy, modify, create derivative
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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.CollectionUtil;

import java.util.LinkedList;
import java.util.List;
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 abstract class AbstractKeyConstraint
    extends AbstractConstraint
    implements IKeyConstraint {
  @NonNull
  private final List<DefaultKeyField> keyFields;

  /**
   * Create a new key-based constraint, which uses a set of key fields to build a
   * key.
   *
   * @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 keyFields
   *          a list of key fields associated with the constraint
   * @param remarks
   *          optional remarks describing the intent of the constraint
   */
  protected AbstractKeyConstraint(
      @Nullable String id,
      @Nullable String formalName,
      @Nullable MarkupLine description,
      @NonNull ISource source,
      @NonNull Level level,
      @NonNull MetapathExpression target,
      @NonNull Map<QName, Set<String>> properties,
      @NonNull List<DefaultKeyField> keyFields,
      @Nullable MarkupMultiline remarks) {
    super(id, formalName, description, source, level, target, properties, remarks);
    if (keyFields.isEmpty()) {
      throw new IllegalArgumentException("an empty list of key fields is not allowed");
    }
    this.keyFields = keyFields;
  }

  @Override
  public List<DefaultKeyField> getKeyFields() {
    return keyFields;
  }

  public abstract static class AbstractKeyConstraintBuilder<
      T extends AbstractKeyConstraintBuilder<T,
          R>,
      R extends AbstractKeyConstraint>
      extends AbstractConstraintBuilder<T, R> {
    @NonNull
    private final List<DefaultKeyField> keyFields = new LinkedList<>();

    public T keyField(@NonNull DefaultKeyField keyField) {
      this.keyFields.add(keyField);
      return getThis();
    }

    @NonNull
    protected List<DefaultKeyField> getKeyFields() {
      return keyFields;
    }

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

      CollectionUtil.requireNonEmpty(getKeyFields());
    }
  }
}