content: /*
   *  Copyright 1999-2021 Alibaba Group Holding 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 com.alibaba.nacos.naming.selector;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.naming.pojo.Instance;
  import com.alibaba.nacos.api.selector.AbstractCmdbSelector;
  import com.alibaba.nacos.api.selector.context.CmdbContext;
  
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  
  /**
   * {@link AbstractCmdbSelector} mock implement.
   *
   * @author chenglu
   * @date 2021-07-14 19:20
   */
  public class MockSelector extends AbstractCmdbSelector<Instance> {
      
      private String key;
      
      private String value;
      
      public String getKey() {
          return key;
      }
      
      public void setKey(String key) {
          this.key = key;
      }
      
      public String getValue() {
          return value;
      }
      
      public void setValue(String value) {
          this.value = value;
      }
      
      @Override
      protected List<Instance> doSelect(CmdbContext<Instance> context) {
          if (context.getProviders() == null) {
              return null;
          }
          return context.getProviders().stream().filter(provider -> {
              Map<String, String> labels = provider.getEntity().getLabels();
              if (labels == null) {
                  return false;
              }
              return value.equals(labels.get(key));
          }).map(CmdbContext.CmdbInstance::getInstance).collect(Collectors.toList());
      }
      
      @Override
      protected void doParse(String expression) throws NacosException {
          String[] keyValues = expression.split("=");
          key = keyValues[0];
          value = keyValues[1];
      }
      
      @Override
      public String getType() {
          return "mock";
      }
      
      @Override
      public String getContextType() {
          return "MOCK_CMDB";
      }
  }
  