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// Copyright 2015-2019 SWIM.AI inc.
//
// Licensed 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 swim.uri;

abstract class UriTerminalMapper extends UriFragmentMapper {
  abstract T get();

  @Override
  T get(UriFragment fragment) {
    return get();
  }

  UriTerminalMapper merged(UriTerminalMapper that) {
    if (that.isEmpty()) {
      return this;
    } else {
      return that;
    }
  }

  @Override
  UriFragmentMapper merged(UriFragmentMapper that) {
    if (that instanceof UriTerminalMapper) {
      return merged((UriTerminalMapper) that);
    } else {
      return that;
    }
  }

  @SuppressWarnings("unchecked")
  public UriTerminalMapper removed() {
    return (UriTerminalMapper) empty();
  }

  @Override
  UriFragmentMapper removed(UriFragment fragment) {
    return removed();
  }

  @SuppressWarnings("unchecked")
  UriTerminalMapper unmerged(UriTerminalMapper that) {
    return (UriTerminalMapper) empty();
  }

  @Override
  UriFragmentMapper unmerged(UriFragmentMapper that) {
    if (that instanceof UriTerminalMapper) {
      return unmerged((UriTerminalMapper) that);
    } else {
      return this;
    }
  }

  static  UriTerminalMapper compile(Uri pattern, T value) {
    return new UriConstantMapping(pattern, value);
  }
}