CharSequenceTermAttributeSerializer.java

// =================================================================================================
// Copyright 2011 Twitter, Inc.
// -------------------------------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this work except in compliance with the License.
// You may obtain a copy of the License in the LICENSE file, or 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.twitter.common.text.util;

import java.io.IOException;

import org.apache.lucene.util.AttributeSource;

import com.twitter.common.text.token.attribute.CharSequenceTermAttribute;

/**
 * (De)Serializes {@link CharSequenceTermAttribute).
 */
public class CharSequenceTermAttributeSerializer implements TokenStreamSerializer.AttributeSerializer {
  private CharSequenceTermAttribute termAtt;
  private TokenStreamSerializer.Version encodingVersion;

  @Override
  public void initialize(AttributeSource attributeSource, TokenStreamSerializer.Version version)
      throws IOException {
    termAtt = attributeSource.addAttribute(CharSequenceTermAttribute.class);
    this.encodingVersion = version;
  }

  @Override
  public void serialize(TokenStreamSerializer.AttributeOutputStream output) throws IOException {
    output.writeVInt(termAtt.getOffset());
    output.writeVInt(termAtt.getLength());
  }

  @Override
  public void deserialize(TokenStreamSerializer.AttributeInputStream input,
                             CharSequence charSequence) throws IOException {
    termAtt.setCharSequence(charSequence);
    termAtt.setOffset(input.readVInt());
    termAtt.setLength(input.readVInt());
  }
}