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/*
 * Sonar Delphi Plugin
 * Copyright (C) 2019 Integrated Application Development
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package au.com.integradev.delphi.msbuild.condition;

import java.util.Optional;

public class NotExpression implements Expression {
  private final Expression expression;

  NotExpression(Expression expression) {
    this.expression = expression;
  }

  @Override
  public Optional boolEvaluate(ExpressionEvaluator evaluator) {
    Optional result = this.expression.boolEvaluate(evaluator);
    return result
        .map(value -> Optional.of(!value))
        .orElseThrow(
            () -> new InvalidExpressionException("Expression does not evaluate to boolean"));
  }

  @Override
  public Optional getValue() {
    return Optional.of("!" + expression.getValue().orElse(""));
  }

  @Override
  public Optional getExpandedValue(ExpressionEvaluator evaluator) {
    return Optional.of("!" + expression.getExpandedValue(evaluator).orElse(""));
  }
}