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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.json;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.Objects;
import java.util.function.BiFunction;
import java.util.stream.Collector;

public class CollectionCoercer extends TypeCoercer {

  private final Class stereotype;
  private final JsonTypeCoercer coercer;
  private final Collector collector;

  public CollectionCoercer(
      Class stereotype,
      JsonTypeCoercer coercer,
      Collector collector) {
    this.stereotype = Objects.requireNonNull(stereotype);
    this.coercer = Objects.requireNonNull(coercer);
    this.collector = Objects.requireNonNull(collector);
  }

  @Override
  public boolean test(Class aClass) {
    return stereotype.isAssignableFrom(aClass);
  }

  @Override
  public BiFunction apply(Type type) {
    Type valueType;

    if (type instanceof ParameterizedType) {
      ParameterizedType pt = (ParameterizedType) type;
      valueType = pt.getActualTypeArguments()[0];
    } else if (type instanceof Class) {
      valueType = Object.class;
    } else {
      throw new IllegalArgumentException("Unhandled type: " + type.getClass());
    }

    return (jsonInput, setting) -> {
      jsonInput.beginArray();
      T toReturn = new JsonInputIterator(jsonInput).asStream()
          .map(in -> coercer.coerce(in, valueType, setting))
          .collect(collector);
      jsonInput.endArray();

      return toReturn;
    };
  }
}