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  /*
   * Copyright (C) 2011 The Guava Authors
   *
   * 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.google.common.hash;
 
 
Funnels for common types. All implementations are serializable.

Author(s):
Dimitris Andreou
Since:
11.0
 
 public final class Funnels {
   private Funnels() {}

  
Returns a funnel that extracts the bytes from a byte array.
 
   public static Funnel<byte[]> byteArrayFunnel() {
     return .;
   }
 
   private enum ByteArrayFunnel implements Funnel<byte[]> {
     INSTANCE;
 
     public void funnel(byte[] fromPrimitiveSink into) {
       into.putBytes(from);
     }
 
     @Override public String toString() {
       return "Funnels.byteArrayFunnel()";
     }
   }

  
Returns a funnel that extracts the characters from a CharSequence.
 
   public static Funnel<CharSequencestringFunnel() {
     return .;
   }
 
   private enum StringFunnel implements Funnel<CharSequence> {
     INSTANCE;
 
     public void funnel(CharSequence fromPrimitiveSink into) {
       into.putString(from);
     }
 
     @Override public String toString() {
       return "Funnels.stringFunnel()";
     }
   }
  
  
Returns a funnel for integers.

Since:
13.0
 
   public static Funnel<IntegerintegerFunnel() {
     return .;
   }
   
   private enum IntegerFunnel implements Funnel<Integer> {
     INSTANCE;
     
     public void funnel(Integer fromPrimitiveSink into) {
       into.putInt(from);
     }
     
     @Override public String toString() {
       return "Funnels.integerFunnel()";
     }
   }

  
Returns a funnel for longs.

Since:
13.0
 
   public static Funnel<LonglongFunnel() {
     return .;
   }
   
  private enum LongFunnel implements Funnel<Long> {
    INSTANCE;
    
    public void funnel(Long fromPrimitiveSink into) {
      into.putLong(from);
    }
    
    @Override public String toString() {
      return "Funnels.longFunnel()";
    }
  }
  
  
Wraps a PrimitiveSink as an java.io.OutputStream, so it is easy to funnel an object to a PrimitiveSink if there is already a way to write the contents of the object to an OutputStream.

The close and flush methods of the returned OutputStream do nothing, and no method throws IOException.

Since:
13.0
  public static OutputStream asOutputStream(PrimitiveSink sink) {
    return new SinkAsStream(sink);
  }
  
  private static class SinkAsStream extends OutputStream {
    final PrimitiveSink sink;
    SinkAsStream(PrimitiveSink sink) {
      this. = Preconditions.checkNotNull(sink);
    }
    
    @Override public void write(int b) {
      .putByte((byteb);
    }
    @Override public void write(byte[] bytes) {
      .putBytes(bytes);
    }
    @Override public void write(byte[] bytesint offint len) {
      .putBytes(bytesofflen);
    }
    
    @Override public String toString() {
      return "Funnels.asOutputStream(" +  + ")";
    }
  }
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