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/*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * 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 io.servicecomb.common.rest.definition;

import java.io.Serializable;
import java.util.Comparator;

import io.servicecomb.common.rest.definition.path.PathRegExp;

/**
 * 用于RestOperation的排序
 */
public class RestOperationComparator implements Serializable, Comparator {

  private static final long serialVersionUID = -2364909265520813678L;

  @Override
  public int compare(RestOperationMeta r1, RestOperationMeta r2) {
    // 排序规则:
    // 1.静态字符多的优先
    // 2.变量组多的优先
    // 3.带正则表达式的优先
    // 如:
    // /customers/{id}/{name}/address
    // /customers/{id : .+}/address
    // /customers/{id}/address
    // /customers/{id : .+}

    PathRegExp path1 = r1.getAbsolutePathRegExp();
    PathRegExp path2 = r2.getAbsolutePathRegExp();

    int staticCompare = path2.getStaticCharCount() - path1.getStaticCharCount();
    if (staticCompare != 0) {
      return staticCompare;
    }

    int groupCompare = path2.getGroupCount() - path1.getGroupCount();
    if (groupCompare != 0) {
      return groupCompare;
    }

    return path2.getGroupWithRegExpCount() - path1.getGroupWithRegExpCount();
  }
}