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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 UriQueryMapper extends UriPathMapper {
  abstract T get(UriQuery query, UriFragment fragment);

  @Override
  T get(UriPath path, UriQuery query, UriFragment fragment) {
    if (path.isEmpty()) {
      return get(query, fragment);
    } else {
      return null;
    }
  }

  abstract UriQueryMapper merged(UriQueryMapper that);

  @Override
  UriPathMapper merged(UriPathMapper that) {
    if (that instanceof UriQueryMapper) {
      return merged((UriQueryMapper) that);
    } else {
      return that;
    }
  }

  abstract UriQueryMapper removed(UriQuery query, UriFragment fragment);

  @Override
  UriPathMapper removed(UriPath path, UriQuery query, UriFragment fragment) {
    if (path.isEmpty()) {
      return removed(query, fragment);
    } else {
      return this;
    }
  }

  abstract UriQueryMapper unmerged(UriQueryMapper that);

  @Override
  UriPathMapper unmerged(UriPathMapper that) {
    if (that instanceof UriQueryMapper) {
      return unmerged((UriQueryMapper) that);
    } else {
      return this;
    }
  }

  static  UriQueryMapper compile(Uri pattern, UriQuery query, UriFragment fragment, T value) {
    return UriFragmentMapper.compile(pattern, fragment, value);
  }
}