code: /*
   * Copyright (c) 2021 Callum Newlands
   *
   *     This program is free software: you can redistribute it and/or modify
   *     it under the terms of the GNU General Public License as published by
   *     the Free Software Foundation, either version 3 of the License, or
   *     (at your option) any later version.
   *
   *     The additional term of 7.b applies: Requiring preservation of specified
   *     reasonable legal notices or author attributions in that material or in the
   *     Appropriate Legal Notices displayed by works containing it
   *
   *     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 General Public License
   *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  package lsystems.modules;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  
  public class ParametricExpressionModule extends ParametricParameterModule {
  
  	private Function<Map<String, Float>, List<Float>> expression;
  
  	public ParametricExpressionModule(char name, List<String> params, Function<Map<String, Float>, List<Float>> expression) {
  		super(name, params);
  		this.expression = expression;
  	}
  
  	@Override
  	public boolean equals(Object o) {
  		if (this == o) {
  			return true;
  		}
  		return super.equals(o);
  	}
  
  
  	@Override
  	public String toString() {
  		return String.format("%s(Function<%s>)",
  				name,
  				params.stream().map(Objects::toString).collect(Collectors.joining(",")));
  	}
  
  	public ParametricValueModule evaluate(Map<String, Float> params) {
  		if (!this.params.stream().allMatch(params::containsKey)) {
  			throw new RuntimeException("Parameter value not provided for (at least) one of: " + this.params.toString() +
  					" in " + this.toString());
  		}
  		return new ParametricValueModule(name, expression.apply(params));
  	}
  }
  