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Copyright (C) 2011 the original author or authors. See the notice.md file distributed with this work for additional information regarding copyright ownership. 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 org.iq80.leveldb.impl;
 
 
 import java.util.List;
 
 import static com.google.common.collect.Lists.newArrayList;
 
 public class WriteBatchImpl implements WriteBatch
 {
     private List<Entry<SliceSlice>> batch = newArrayList();
     private int approximateSize;
 
     public int getApproximateSize()
     {
         return ;
     }
 
     public int size()
     {
         return .size();
     }
 
     @Override
     public WriteBatchImpl put(byte[] keybyte[] value)
     {
         Preconditions.checkNotNull(key"key is null");
         Preconditions.checkNotNull(value"value is null");
         .add(Maps.immutableEntry(Slices.wrappedBuffer(key), Slices.wrappedBuffer(value)));
          += 12 + key.length + value.length;
         return this;
     }
 
     public WriteBatchImpl put(Slice keySlice value)
     {
         Preconditions.checkNotNull(key"key is null");
         Preconditions.checkNotNull(value"value is null");
         .add(Maps.immutableEntry(keyvalue));
          += 12 + key.length() + value.length();
         return this;
     }
 
     @Override
     public WriteBatchImpl delete(byte[] key)
     {
         Preconditions.checkNotNull(key"key is null");
         .add(Maps.immutableEntry(Slices.wrappedBuffer(key), (Slicenull));
          += 6 + key.length;
         return this;
     }
 
     public WriteBatchImpl delete(Slice key)
     {
         Preconditions.checkNotNull(key"key is null");
         .add(Maps.immutableEntry(key, (Slicenull));
          += 6 + key.length();
         return this;
     }
 
     @Override
     public void close()
     {
     }
 
     public void forEach(Handler handler)
     {
         for (Entry<SliceSliceentry : ) {
             Slice key = entry.getKey();
             Slice value = entry.getValue();
             if (value != null) {
                 handler.put(keyvalue);
             }
             else {
                 handler.delete(key);
             }
         }
     }
    public static interface Handler
    {
        void put(Slice keySlice value);
        void delete(Slice key);
    }
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