content: package org.apache.lucene.analysis.tokenattributes;
  
  /**
   * 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 java.io.Serializable;
  
  import org.apache.lucene.index.Payload;
  import org.apache.lucene.util.AttributeImpl;
  
  /**
   * The payload of a Token. See also {@link Payload}.
   */
  public class PayloadAttributeImpl extends AttributeImpl implements PayloadAttribute, Cloneable, Serializable {
    private Payload payload;  
    
    /**
     * Initialize this attribute with no payload.
     */
    public PayloadAttributeImpl() {}
    
    /**
     * Initialize this attribute with the given payload. 
     */
    public PayloadAttributeImpl(Payload payload) {
      this.payload = payload;
    }
    
    /**
     * Returns this Token's payload.
     */ 
    public Payload getPayload() {
      return this.payload;
    }
  
    /** 
     * Sets this Token's payload.
     */
    public void setPayload(Payload payload) {
      this.payload = payload;
    }
    
    @Override
    public void clear() {
      payload = null;
    }
  
    @Override
    public Object clone()  {
      PayloadAttributeImpl clone = (PayloadAttributeImpl) super.clone();
      if (payload != null) {
        clone.payload = (Payload) payload.clone();
      }
      return clone;
    }
  
    @Override
    public boolean equals(Object other) {
      if (other == this) {
        return true;
      }
      
      if (other instanceof PayloadAttribute) {
        PayloadAttributeImpl o = (PayloadAttributeImpl) other;
        if (o.payload == null || payload == null) {
          return o.payload == null && payload == null;
        }
        
        return o.payload.equals(payload);
      }
      
      return false;
    }
  
    @Override
    public int hashCode() {
      return (payload == null) ? 0 : payload.hashCode();
    }
  
    @Override
    public void copyTo(AttributeImpl target) {
      PayloadAttribute t = (PayloadAttribute) target;
      t.setPayload((payload == null) ? null : (Payload) payload.clone());
    }  
  
    
  }
  