org.openqa.selenium.remote.server.KnownElements.java Source code

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Here is the source code for org.openqa.selenium.remote.server.KnownElements.java

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// 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.remote.server;

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

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

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

public class KnownElements {

    private final BiMap<String, WebElement> 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 = (object, method, objects) -> {
            if ("getId".equals(method.getName())) {
                return id;
            } else if ("getWrappedElement".equals(method.getName())) {
                return element;
            } else {
                try {
                    return method.invoke(element, objects);
                } catch (InvocationTargetException e) {
                    throw e.getTargetException();
                }
            }
        };

        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();
    }
}