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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2007 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.javascript.jscomp;

import com.google.common.collect.ImmutableSet;

/**
 * An error manager that generates a sorted report when the {@link #generateReport()} method is
 * called.
 *
 * This error manager does not produce any output, but subclasses can override the {@link
 * #println(CheckLevel, JSError)} method to generate custom output. Consider using the
 * SortingErrorManager with a custom {@link SortingErrorManager.ErrorReportGenerator} instead.
 */
@Deprecated
public abstract class BasicErrorManager extends SortingErrorManager {

  public BasicErrorManager() {
    super(ImmutableSet.of());
  }

  @Override
  public void generateReport() {
    for (ErrorWithLevel message : super.getSortedDiagnostics()) {
      println(message.level, message.error);
    }
    printSummary();
  }

  /**
   * Print a message with a trailing new line. This method is called by the
   * {@link #generateReport()} method when generating messages.
   */
  public abstract void println(CheckLevel level, JSError error);

  /**
   * Print the summary of the compilation - number of errors and warnings.
   */
  protected abstract void printSummary();
}