org.openqa.selenium.remote.server.KnownElements Maven / Gradle / Ivy

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/*
Copyright 2007-2009 WebDriver committers
Copyright 2007-2009 Google Inc.

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 org.openqa.selenium.remote.server;

import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;

import org.openqa.selenium.WebElement;
import org.openqa.selenium.internal.Locatable;
import org.openqa.selenium.internal.WrapsElement;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class KnownElements {

  private final BiMap elements = HashBiMap.create();
  private int nextId;

  public String add(WebElement element) {
    if (elements.containsValue(element)) {
      return elements.inverse().get(element);
    }
    String id = getNextId();
    elements.put(id, proxyElement(element, id));
    return id;
  }

  public WebElement get(String elementId) {
    return elements.get(elementId);
  }

  // WebDriver is single threaded. Expect only a single thread at a time to access this
  private String getNextId() {
    return String.valueOf(nextId++);
  }

  private WebElement proxyElement(final WebElement element, final String id) {
    InvocationHandler handler = new InvocationHandler() {
      public Object invoke(Object object, Method method, Object[] objects) throws Throwable {
        if ("getId".equals(method.getName())) {
          return id;
        } else if ("getWrappedElement".equals(method.getName())) {
          return element;
        } else {
          return method.invoke(element, objects);
        }
      }
    };

    Class[] proxyThese;
    if (element instanceof Locatable) {
      proxyThese = new Class[] {WebElement.class, ProxiedElement.class, Locatable.class};
    } else {
      proxyThese = new Class[] {WebElement.class, ProxiedElement.class};
    }

    return (WebElement) Proxy.newProxyInstance(element.getClass().getClassLoader(),
        proxyThese,
        handler);
  }

  public interface ProxiedElement extends WrapsElement {
    String getId();
  }
}