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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 2008 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.annotations.GwtIncompatible;
import java.io.Serializable;
import java.text.MessageFormat;

/**
 * The type of a compile or analysis error.
 *
 */
public final class DiagnosticType
    implements Comparable, Serializable {
  private static final long serialVersionUID = 1;

  /**
   * The error type. Used as the BugPattern and BugInstance types by
   * BugBot's XML
   */
  public final String key;

  /** The default way to format errors */
  public final MessageFormat format;

  /** The default reporting level for this diagnostic */
  public final CheckLevel level;

  /**
   * Create a DiagnosticType at level CheckLevel.ERROR
   *
   * @param name An identifier
   * @param descriptionFormat A format string
   * @return A new DiagnosticType
   */
  public static DiagnosticType error(String name, String descriptionFormat) {
    return make(name, CheckLevel.ERROR, descriptionFormat);
  }

  /**
   * Create a DiagnosticType at level CheckLevel.WARNING
   *
   * @param name An identifier
   * @param descriptionFormat A format string
   * @return A new DiagnosticType
   */
  public static DiagnosticType warning(String name, String descriptionFormat) {
    return make(name, CheckLevel.WARNING, descriptionFormat);
  }

  /**
   * Create a DiagnosticType at level CheckLevel.OFF
   *
   * @param name An identifier
   * @param descriptionFormat A format string
   * @return A new DiagnosticType
   */
  public static DiagnosticType disabled(String name,
      String descriptionFormat) {
    return make(name, CheckLevel.OFF, descriptionFormat);
  }

  /**
   * Create a DiagnosticType at a given CheckLevel.
   *
   * @param name An identifier
   * @param level Either CheckLevel.ERROR or CheckLevel.WARNING
   * @param descriptionFormat A format string
   * @return A new DiagnosticType
   */
  public static DiagnosticType make(String name, CheckLevel level,
                                    String descriptionFormat) {
    return
        new DiagnosticType(name, level, new MessageFormat(descriptionFormat));
  }

  /**
   * Create a DiagnosticType. Private to force use of static factory methods.
   */
  private DiagnosticType(String key, CheckLevel level, MessageFormat format) {
    this.key = key;
    this.level = level;
    this.format = format;
  }

  /**
   * Create a description from the MessageFormat and the arguments.
   * Used by unit tests.
   */
  String format(Object ... arguments) {
    return format.format(arguments);
  }

  @Override
  public boolean equals(Object type) {
    return type instanceof DiagnosticType &&
        ((DiagnosticType) type).key.equals(key);
  }

  @Override
  public int hashCode() {
    return key.hashCode();
  }

  @Override
  public int compareTo(DiagnosticType diagnosticType) {
    return key.compareTo(diagnosticType.key);
  }

  @Override
  @GwtIncompatible("java.text.MessageFormat.toPattern()")
  public String toString() {
    return key + ": " + format.toPattern();
  }
}