INamedInstance.java

/*
 * Portions of this software was developed by employees of the National Institute
 * 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
 * protection in the United States. This software may be subject to foreign
 * copyright. Permission in the United States and in foreign countries, to the
 * extent that NIST may hold copyright, to use, copy, modify, create derivative
 * works, and distribute this software and its documentation without fee is hereby
 * granted on a non-exclusive basis, provided that this notice and disclaimer
 * of warranty appears in all copies.
 *
 * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
 * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
 * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
 * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
 * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE.  IN NO EVENT
 * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
 * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
 * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
 * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
 * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
 * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
 */

package gov.nist.secauto.metaschema.core.model;

import gov.nist.secauto.metaschema.core.datatype.markup.MarkupLine;

import javax.xml.namespace.QName;

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

/**
 * This marker interface indicates that the instance has a flag, field, or
 * assembly name associated with it which will be used in JSON/YAML or XML to
 * identify the data.
 *
 */
public interface INamedInstance extends IInstance, INamedModelElement {

  /**
   * Retrieve the definition of this instance.
   *
   * @return the corresponding definition
   */
  @NonNull
  IDefinition getDefinition();

  /**
   * Get the XML qualified name to use in XML.
   *
   * @return the XML qualified name, or {@code null} if there isn't one
   */
  default QName getXmlQName() {
    return new QName(getXmlNamespace(), getEffectiveName());
  }

  /**
   * Retrieve the XML namespace for this instance.
   *
   * @return the XML namespace or {@code null} if no namespace is defined
   */
  default String getXmlNamespace() {
    return getContainingModule().getXmlNamespace().toASCIIString();
  }

  /**
   * Get the current value from the provided {@code parentInstance} object. The
   * provided object must be of the type associated with the definition containing
   * this property.
   *
   * @param parentInstance
   *          the object associated with the definition containing this property
   * @return the value if available, or {@code null} otherwise
   */
  Object getValue(@NonNull Object parentInstance);

  /**
   * Generates a "coordinate" string for the provided information element
   * instance.
   *
   * A coordinate consists of the element's:
   * <ul>
   * <li>containing Metaschema module's short name</li>
   * <li>model type</li>
   * <li>name</li>
   * <li>hash code</li>
   * <li>the hash code of the definition</li>
   * </ul>
   *
   * @return the coordinate
   */
  @SuppressWarnings("null")
  @Override
  default String toCoordinates() {
    IDefinition definition = getDefinition();
    return String.format("%s:%s:%s@%d(%d)",
        getContainingDefinition().getContainingModule().getShortName(),
        getModelType(),
        definition.getName(),
        hashCode(),
        definition.isInline() ? 0 : definition.hashCode());
  }

  @Override
  @NonNull
  default String getEffectiveName() {
    String result = getUseName();
    if (result == null) {
      // fall back to the definition
      IDefinition def = getDefinition();
      result = def.getEffectiveName();
    }
    return result;
  }

  @Override
  default String getEffectiveFormalName() {
    String result = getFormalName();
    return result == null ? getDefinition().getEffectiveFormalName() : result;
  }

  @Override
  default MarkupLine getEffectiveDescription() {
    MarkupLine result = getDescription();
    return result == null ? getDefinition().getEffectiveDescription() : result;
  }
}