/*
    * SPDX-FileCopyrightText: Copyright (c) 2012-2025 Yegor Bugayenko
    * SPDX-License-Identifier: MIT
    */
   package com.jcabi.xml;
   
   import com.jcabi.log.Logger;
   import java.util.Collection;
   import java.util.Collections;
  import java.util.concurrent.CopyOnWriteArrayList;
  import javax.xml.transform.ErrorListener;
  import javax.xml.transform.TransformerException;
  
  /**
   * Error listener to console.
   *
   * @since 0.22
   */
  final class ConsoleErrorListener implements ErrorListener {
  
      /**
       * Errors.
       */
      private final Collection<String> errors =
          new CopyOnWriteArrayList<>();
  
      @Override
      public void warning(final TransformerException warning) {
          Logger.warn(
              this, "#warning(): %s",
              warning.getMessageAndLocation()
          );
          this.errors.add(warning.getMessageAndLocation());
      }
  
      @Override
      public void error(final TransformerException error) {
          Logger.error(
              this, "#error(): %s",
              error.getMessageAndLocation()
          );
          this.errors.add(error.getMessageAndLocation());
      }
  
      @Override
      public void fatalError(final TransformerException error) {
          Logger.error(
              this, "#fatalError(): %s",
              error.getMessageAndLocation()
          );
          this.errors.add(error.getMessageAndLocation());
      }
  
      /**
       * Return all errors.
       * @return List of errors accumulated
       */
      public Collection<String> summary() {
          return Collections.unmodifiableCollection(this.errors);
      }
  
  }