IConfiguration.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.configuration;

import java.util.Map;

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

/**
 * The base interface for getting the configuration of processors and parsers in
 * this library. This provides an immutable view of the current configuration.
 *
 * @param <T>
 *          the type of the feature set
 */
public interface IConfiguration<T extends IConfigurationFeature<?>> {
  /**
   * Determines if a specific feature is enabled.
   *
   * @param feature
   *          the feature to check for
   * @return {@code true} if the feature is enabled, or {@code false} otherwise
   * @throws UnsupportedOperationException
   *           if the feature is not a boolean valued feature
   * @see IConfigurationFeature#getValueClass()
   */
  boolean isFeatureEnabled(@NonNull T feature);

  /**
   * Get the configuration value of the provided {@code feature}.
   *
   * @param <V>
   *          the value type
   * @param feature
   *          the requested feature
   * @return the value of the feature
   */
  @SuppressWarnings("unchecked")
  @NonNull
  default <V> V get(@NonNull T feature) {
    V value = (V) getFeatureValues().get(feature);
    if (value == null) {
      value = (V) feature.getDefault();
    }
    return value;
  }

  /**
   * Get the mapping of each feature mapped to its value.
   *
   * @return the mapping
   */
  @NonNull
  Map<T, Object> getFeatureValues();
}