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Selenium automates browsers. That's it! What you do with that power is entirely up to you.

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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.grid.web;

import java.util.HashMap;
import java.util.Map;
import java.util.function.Predicate;
import org.openqa.selenium.internal.Require;
import org.openqa.selenium.json.Json;
import org.openqa.selenium.remote.http.HttpHandler;
import org.openqa.selenium.remote.http.HttpRequest;
import org.openqa.selenium.remote.http.HttpResponse;
import org.openqa.selenium.remote.http.Routable;

public class CombinedHandler implements Predicate, Routable, HttpHandler {

  private final Map handlers = new HashMap<>();

  public void addHandler(Routable handler) {
    handlers.put(Require.nonNull("Handler", handler), handler);
  }

  @Override
  public boolean test(HttpRequest request) {
    return matches(request);
  }

  @Override
  public boolean matches(HttpRequest req) {
    return handlers.keySet().stream().anyMatch(p -> p.matches(req));
  }

  @Override
  public HttpResponse execute(HttpRequest req) {
    return handlers.entrySet().stream()
        .filter(entry -> entry.getKey().matches(req))
        .findFirst()
        .map(Map.Entry::getValue)
        .orElse(new NoHandler(new Json()))
        .execute(req);
  }
}