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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. This binary checks for style issues such as incorrect or missing JSDoc usage, and missing goog.require() statements. It does not do more advanced checks such as typechecking.

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/*
 * Copyright 2017 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.base.Optional;
import com.google.common.collect.ImmutableList;

/**
 * A simple delegating {@link ErrorManager} that provides a thread-safe wrapper
 * for the one being delegated.
 */
public class ThreadSafeDelegatingErrorManager implements ErrorManager {
  private final ErrorManager delegated;

  public ThreadSafeDelegatingErrorManager(ErrorManager delegated) {
    this.delegated = delegated;
  }

  @Override
  public synchronized void report(CheckLevel level, JSError error) {
    delegated.report(level, error);
  }

  @Override
  public synchronized void generateReport() {
    delegated.generateReport();
  }

  @Override
  public boolean hasHaltingErrors() {
    return delegated.hasHaltingErrors();
  }

  @Override
  public synchronized int getErrorCount() {
    return delegated.getErrorCount();
  }

  @Override
  public synchronized int getWarningCount() {
    return delegated.getWarningCount();
  }

  @Override
  public synchronized ImmutableList getErrors() {
    return delegated.getErrors();
  }

  @Override
  public synchronized ImmutableList getWarnings() {
    return delegated.getWarnings();
  }

  @Override
  public synchronized void setTypedPercent(double typedPercent) {
    delegated.setTypedPercent(typedPercent);
  }

  @Override
  public synchronized double getTypedPercent() {
    return delegated.getTypedPercent();
  }

  @Override
  public synchronized boolean shouldReportConformanceViolation(
      Requirement requirement,
      Optional whitelistEntry,
      JSError diagnostic) {
    return delegated.shouldReportConformanceViolation(requirement, whitelistEntry, diagnostic);
  }
}