/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package gov.nist.secauto.metaschema.core.metapath.impl;
   
   import gov.nist.secauto.metaschema.core.metapath.function.IFunction;
   import gov.nist.secauto.metaschema.core.metapath.item.atomic.IAnyAtomicItem;
  import gov.nist.secauto.metaschema.core.metapath.type.ISequenceType;
  import gov.nist.secauto.metaschema.core.metapath.type.Occurrence;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  
  import java.util.EnumSet;
  import java.util.Set;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  /**
   * Provides default methods for node items that represent collections of
   * Metapath items and sequences.
   */
  public interface IFeatureCollectionFunctionItem extends IFunction {
    /**
     * The function properties.
     */
    @NonNull
    Set<FunctionProperty> PROPERTIES = ObjectUtils.notNull(
        EnumSet.of(FunctionProperty.DETERMINISTIC));
    /**
     * The function result.
     */
    @NonNull
    ISequenceType RESULT = ISequenceType.of(
        IAnyAtomicItem.type(), Occurrence.ZERO_OR_ONE);
  
    @Override
    default boolean isDeterministic() {
      return true;
    }
  
    @Override
    default boolean isContextDepenent() {
      return false;
    }
  
    @Override
    default boolean isFocusDependent() {
      return false;
    }
  
    @Override
    default Set<FunctionProperty> getProperties() {
      return PROPERTIES;
    }
  
    @Override
    default int arity() {
      return 1;
    }
  
    @Override
    default boolean isArityUnbounded() {
      return false;
    }
  
    @Override
    default ISequenceType getResult() {
      return RESULT;
    }
  
    @Override
    default boolean isNamedFunction() {
      // these functions are not named, since they refer to anonymous collections
      return false;
    }
  }