content: package org.apache.lucene.analysis.payloads;
  /**
   * 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.
   */
  
  import org.apache.lucene.index.Payload;
  
  import java.nio.ByteBuffer;
  import java.nio.CharBuffer;
  import java.nio.charset.Charset;
  
  
  /**
   *  Does nothing other than convert the char array to a byte array using the specified encoding.
   *
   **/
  public class IdentityEncoder extends AbstractEncoder implements PayloadEncoder{
  
    protected Charset charset = Charset.forName("UTF-8");
    
    /** @deprecated This field is no longer used. Use {@link #charset} instead. */
    @Deprecated
    protected String charsetName = charset.name();
  
    public IdentityEncoder() {
    }
  
    public IdentityEncoder(Charset charset) {
      this.charset = charset;
      // @deprecated, remove this in 4.0:
      charsetName = charset.name();
    }
  
  
    public Payload encode(char[] buffer, int offset, int length) {
      final ByteBuffer bb = charset.encode(CharBuffer.wrap(buffer, offset, length));
      if (bb.hasArray()) {
        return new Payload(bb.array(), bb.arrayOffset() + bb.position(), bb.remaining());
      } else {
        // normally it should always have an array, but who knows?
        final byte[] b = new byte[bb.remaining()];
        bb.get(b);
        return new Payload(b);
      }
    }
  }
  