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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 2014 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.newtypes;

import com.google.common.annotations.GwtIncompatible;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.Set;

/** A persistent map that simply wraps Clojure's implementation */
@GwtIncompatible("java.lang.reflect")
final class ClojurePersistentHashMap extends PersistentMap implements Serializable {
  private static Method assoc;
  private static Method without;
  private final Map map;

  private ClojurePersistentHashMap(Map m) {
    this.map = m;
  }

  public static  PersistentMap create(Class cls)  {
    try {
      assoc = cls.getDeclaredMethod("assoc", Object.class, Object.class);
      without = cls.getDeclaredMethod("without", Object.class);
      Map m = (Map) cls.getDeclaredField("EMPTY").get(null);
      return new ClojurePersistentHashMap<>(m);
    } catch (ReflectiveOperationException e) {
      throw new RuntimeException(e);
    }
  }

  public PersistentMap with(K key, V value) {
    try {
      Map m = (Map) assoc.invoke(this.map, key, value);
      return new ClojurePersistentHashMap<>(m);
    } catch (ReflectiveOperationException e) {
      throw new RuntimeException(e);
    }
  }

  public PersistentMap without(K key) {
    try {
      Map m = (Map) without.invoke(this.map, key);
      return new ClojurePersistentHashMap<>(m);
    } catch (ReflectiveOperationException e) {
      throw new RuntimeException(e);
    }
  }

  @Override
  @SuppressWarnings("unchecked")
  public V get(Object key) {
    return (V) this.map.get(key);
  }

  @Override
  @SuppressWarnings("unchecked")
  public Set keySet() {
    return this.map.keySet();
  }

  @Override
  public boolean containsKey(Object key) {
    return this.map.containsKey(key);
  }

  @Override
  @SuppressWarnings("unchecked")
  public Set> entrySet() {
    return this.map.entrySet();
  }

  @Override
  public int size() {
    return this.map.size();
  }

  @Override
  public boolean isEmpty() {
    return this.map.isEmpty();
  }

  @Override
  public boolean equals(Object o) {
    if (o instanceof ClojurePersistentHashMap) {
      ClojurePersistentHashMap pm = (ClojurePersistentHashMap) o;
      return this.map.equals(pm.map);
    }
    return false;
  }

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