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The modules contains the core implementation code of Fluo.

There is a newer version: 1.0.0-beta-2

/*
 * Copyright 2014 Fluo authors (see 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 io.fluo.core.util;

import io.fluo.api.data.Bytes;
import org.apache.accumulo.core.data.ArrayByteSequence;
import org.apache.accumulo.core.data.ByteSequence;
import org.apache.hadoop.io.Text;

/**
 * Utilities for modifying byte arrays and converting
 * Bytes objects to external formats
 */
public class ByteUtil {
  
  public static final byte[] EMPTY = new byte[0];
  
  private ByteUtil() {}



  /**
   * Convert from Bytes to Hadoop Text object
   * 
   * @param b Bytes
   * @return Text object
   */
  public static Text toText(Bytes b) {
    if (b.isBackedByArray()) {
      Text t = new Text(EMPTY);
      t.set(b.getBackingArray(), b.offset(), b.length());
      return t;
    } else {
      return new Text(b.toArray());
    }
  }
  
  /**
   * Convert from Hadoop Text to Bytes object
   * 
   * @param t Text
   * @return Bytes object
   */
  public static Bytes toBytes(Text t) {
    return Bytes.wrap(t.getBytes(), 0, t.getLength());
  }
  
  /**
   * Convert from Bytes to ByteSequence object
   * 
   * @param b Bytes
   * @return ByteSequence object
   */
  public static ByteSequence toByteSequence(Bytes b) {
    if (b.isBackedByArray()) {
      return new ArrayByteSequence(b.getBackingArray(), b.offset(), b.length());
    } else {
      return new ArrayByteSequence(b.toArray());
    }
  }
  
  /**
   * Converts from ByteSequence to Bytes. If the ByteSequenc has a backing
   * array, that array (and the buffer's offset and limit) are used.  Otherwise,
   * a new backing array is created.
   *
   * @param bs ByteSequence
   * @return Bytes object
   */
  public static Bytes toBytes(ByteSequence bs) {
    if (bs.isBackedByArray()) {
      return Bytes.wrap(bs.getBackingArray(), bs.offset(), bs.length());
    } else {
      return Bytes.wrap(bs.toArray(), 0, bs.length());
    }
  }
}