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/*-
 * #%L
 * marid-runtime
 * %%
 * Copyright (C) 2012 - 2017 MARID software development group
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 * #L%
 */

package org.marid.beans;

import org.marid.expression.generic.Expression;

import org.jetbrains.annotations.NotNull;
import java.util.List;
import java.util.stream.Stream;

import static java.util.stream.Stream.*;

public interface MaridBean {

  MaridBean getParent();

  @NotNull
  String getName();

  @NotNull
  Expression getFactory();

  @NotNull
  List getChildren();

  @NotNull
  default Stream ancestors() {
    return ofNullable(getParent()).flatMap(p -> concat(of(p), p.ancestors()));
  }

  @NotNull
  default Stream descendants() {
    return getChildren().stream().flatMap(b -> concat(of(b), b.descendants()));
  }

  @NotNull
  default Stream siblings() {
    return ofNullable(getParent()).flatMap(p -> p.getChildren().stream().filter(c -> c != this));
  }

  @NotNull
  default Stream matchingCandidates() {
    return concat(siblings(), ancestors()
        .filter(p -> p.getParent() != null)
        .flatMap(p -> concat(of(p), p.siblings())));
  }
}