content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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.apache.cassandra.cache;
  
  import java.util.Collections;
  import java.util.Iterator;
  
  public class NopCacheProvider implements CacheProvider<RowCacheKey, IRowCacheEntry>
  {
      public ICache<RowCacheKey, IRowCacheEntry> create()
      {
          return new NopCache();
      }
  
      private static class NopCache implements ICache<RowCacheKey, IRowCacheEntry>
      {
          public long capacity()
          {
              return 0;
          }
  
          public void setCapacity(long capacity)
          {
              if (capacity != 0)
              {
                  throw new UnsupportedOperationException("Setting capacity of " + NopCache.class.getSimpleName()
                                                          + " is not permitted as this cache is disabled. Check your yaml settings if you want to enable it.");
              }
          }
  
          public void put(RowCacheKey key, IRowCacheEntry value)
          {
          }
  
          public boolean putIfAbsent(RowCacheKey key, IRowCacheEntry value)
          {
              return false;
          }
  
          public boolean replace(RowCacheKey key, IRowCacheEntry old, IRowCacheEntry value)
          {
              return false;
          }
  
          public IRowCacheEntry get(RowCacheKey key)
          {
              return null;
          }
  
          public void remove(RowCacheKey key)
          {
          }
  
          public int size()
          {
              return 0;
          }
  
          public long weightedSize()
          {
              return 0;
          }
  
          public void clear()
          {
          }
  
          public Iterator<RowCacheKey> hotKeyIterator(int n)
          {
              return Collections.emptyIterator();
          }
  
          public Iterator<RowCacheKey> keyIterator()
          {
              return Collections.emptyIterator();
          }
  
          public boolean containsKey(RowCacheKey key)
          {
              return false;
          }
      }
  }
  