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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.internal;

import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.openqa.selenium.remote.RemoteWebElement;

import java.util.Collection;
import java.util.Map;

/**
 * Reconstitutes {@link WebElement}s from their JSON representation. Will recursively convert Lists
 * and Maps to catch nested references. All other values pass through the converter unchanged.
 */
public class JsonToWebElementConverter implements Function {
  private final RemoteWebDriver driver;

  public JsonToWebElementConverter(RemoteWebDriver driver) {
    this.driver = driver;
  }

  public Object apply(Object result) {
    if (result instanceof Collection) {
      Collection results = (Collection) result;
      return Lists.newArrayList(Iterables.transform(results, this));
    }

    if (result instanceof Map) {
      Map resultAsMap = (Map) result;
      if (resultAsMap.containsKey("ELEMENT")) {
        RemoteWebElement element = newRemoteWebElement();
        element.setId(String.valueOf(resultAsMap.get("ELEMENT")));
        element.setFileDetector(driver.getFileDetector());
        return element;
      } else if (resultAsMap.containsKey("element-6066-11e4-a52e-4f735466cecf")) {
        RemoteWebElement element = newRemoteWebElement();
        element.setId(String.valueOf(resultAsMap.get("element-6066-11e4-a52e-4f735466cecf")));
        element.setFileDetector(driver.getFileDetector());
        return element;
      } else {
        return Maps.transformValues(resultAsMap, this);
      }
    }

    if (result instanceof Number) {
      if (result instanceof Float || result instanceof Double) {
        return ((Number) result).doubleValue();
      }
      return ((Number) result).longValue();
    }

    return result;
  }

  protected RemoteWebElement newRemoteWebElement() {
    RemoteWebElement toReturn = new RemoteWebElement();
    toReturn.setParent(driver);
    return toReturn;
  }
}