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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.handler;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;

import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.server.JsonParametersAware;
import org.openqa.selenium.remote.server.Session;

import java.util.List;
import java.util.Map;
import java.util.Set;

public class FindChildElements extends WebElementHandler>>
    implements JsonParametersAware {
  private volatile By by;

  public FindChildElements(Session session) {
    super(session);
  }

  public void setJsonParameters(Map allParameters) throws Exception {
    by = newBySelector().pickFromJsonParameters(allParameters);
  }

  @Override
  public Set> call() throws Exception {
    List elements = getElement().findElements(by);
    return Sets.newLinkedHashSet(
        Iterables.transform(elements, new Function>() {
          public Map apply(WebElement element) {
            return ImmutableMap.of("ELEMENT", getKnownElements().add(element));
          }
        }));
  }

  @Override
  public String toString() {
    return String.format("[find child elements: %s, %s]", getElementAsString(), by);
  }
}