content: package org.apache.lucene.analysis.miscellaneous;
  
  /**
   * 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.IOException;
  
  import org.apache.lucene.util.AttributeImpl;
  import org.apache.lucene.analysis.Token;
  import org.apache.lucene.analysis.TokenStream;
  import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
  
  /**
   * A {@link TokenStream} containing a single token.
   */
  public final class SingleTokenTokenStream extends TokenStream {
  
    private boolean exhausted = false;
    
    // The token needs to be immutable, so work with clones!
    private Token singleToken;
    private final AttributeImpl tokenAtt;
  
    public SingleTokenTokenStream(Token token) {
      super(Token.TOKEN_ATTRIBUTE_FACTORY);
      
      assert token != null;
      this.singleToken = (Token) token.clone();
      
      tokenAtt = (AttributeImpl) addAttribute(CharTermAttribute.class);
      assert (tokenAtt instanceof Token);
    }
  
    @Override
    public final boolean incrementToken() throws IOException {
      if (exhausted) {
        return false;
      } else {
        clearAttributes();
        singleToken.copyTo(tokenAtt);
        exhausted = true;
        return true;
      }
    }
  
    @Override
    public void reset() throws IOException {
      exhausted = false;
    }
  
    public Token getToken() {
      return (Token) singleToken.clone();
    }
  
    public void setToken(Token token) {
      this.singleToken = (Token) token.clone();
    }
  }
  