code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you 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 org.openqa.selenium;
  
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Objects;
  import java.util.Set;
  import java.util.WeakHashMap;
  
  class UnpinnedScriptKey extends ScriptKey {
  
    private static final WeakHashMap<JavascriptExecutor, Set<UnpinnedScriptKey>> pinnedScripts =
        new WeakHashMap<>();
    private final String script;
  
    static UnpinnedScriptKey pin(JavascriptExecutor executor, String script) {
      UnpinnedScriptKey toReturn = new UnpinnedScriptKey(script);
      synchronized (pinnedScripts) {
        pinnedScripts.computeIfAbsent(executor, ignored -> new HashSet<>()).add(toReturn);
      }
      return toReturn;
    }
  
    static void unpin(JavascriptExecutor executor, UnpinnedScriptKey key) {
      synchronized (pinnedScripts) {
        pinnedScripts.getOrDefault(executor, new HashSet<>()).remove(key);
      }
    }
  
    static Set<UnpinnedScriptKey> getPinnedScripts(JavascriptExecutor executor) {
      Set<UnpinnedScriptKey> toReturn;
      synchronized (pinnedScripts) {
        toReturn = pinnedScripts.getOrDefault(executor, new HashSet<>());
      }
      return Collections.unmodifiableSet(toReturn);
    }
  
    private UnpinnedScriptKey(String script) {
      super(script);
  
      this.script = script;
    }
  
    String getScript() {
      return script;
    }
  
    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
  
      if (!super.equals(o)) {
        return false;
      }
  
      UnpinnedScriptKey that = (UnpinnedScriptKey) o;
      return Objects.equals(this.script, that.script);
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(super.hashCode(), script);
    }
  }
  