import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
public void test() throws Exception {
  Directory dir = newDirectory();
  IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random()));
  conf.setCodec(new Lucene42Codec());
  // riw should sometimes create docvalues fields, etc
  RandomIndexWriter riw = new RandomIndexWriter(random(), dir, conf);
  Document doc = new Document();
  // these fields should sometimes get term vectors, etc
  Field idField = newStringField("id", "", Field.Store.NO);
  Field bodyField = newTextField("body", "", Field.Store.NO);
  doc.add(idField);
  doc.add(bodyField);
  for (int i = 0; i < 100; i++) {
    idField.setStringValue(Integer.toString(i));
    bodyField.setStringValue(_TestUtil.randomUnicodeString(random()));
    riw.addDocument(doc);
    if (random().nextInt(7) == 0) {
      riw.commit();
    }
  }
  riw.close();
  checkHeaders(dir);
  dir.close();
}
 

import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
/** Return a Codec that can read any of the
 *  default codecs and formats, but always writes in the specified
 *  format. */
public static Codec alwaysPostingsFormat(final PostingsFormat format) {
  // TODO: we really need for postings impls etc to announce themselves
  // (and maybe their params, too) to infostream on flush and merge.
  // otherwise in a real debugging situation we won't know whats going on!
  if (LuceneTestCase.VERBOSE) {
    System.out.println("forcing postings format to:" + format);
  }
  return new Lucene42Codec() {
    @Override
    public PostingsFormat getPostingsFormatForField(String field) {
      return format;
    }
  };
}
 

import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
/** Return a Codec that can read any of the
 *  default codecs and formats, but always writes in the specified
 *  format. */
public static Codec alwaysDocValuesFormat(final DocValuesFormat format) {
  // TODO: we really need for docvalues impls etc to announce themselves
  // (and maybe their params, too) to infostream on flush and merge.
  // otherwise in a real debugging situation we won't know whats going on!
  if (LuceneTestCase.VERBOSE) {
    System.out.println("forcing docvalues format to:" + format);
  }
  return new Lucene42Codec() {
    @Override
    public DocValuesFormat getDocValuesFormatForField(String field) {
      return format;
    }
  };
}
 

import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
public void testSameCodecDifferentInstance() throws Exception {
  Codec codec = new Lucene42Codec() {
    @Override
    public PostingsFormat getPostingsFormatForField(String field) {
      if ("id".equals(field)) {
        return new Pulsing41PostingsFormat(1);
      } else if ("date".equals(field)) {
        return new Pulsing41PostingsFormat(1);
      } else {
        return super.getPostingsFormatForField(field);
      }
    }
  };
  doTestMixedPostings(codec);
}
 

import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
public void testSameCodecDifferentParams() throws Exception {
  Codec codec = new Lucene42Codec() {
    @Override
    public PostingsFormat getPostingsFormatForField(String field) {
      if ("id".equals(field)) {
        return new Pulsing41PostingsFormat(1);
      } else if ("date".equals(field)) {
        return new Pulsing41PostingsFormat(2);
      } else {
        return super.getPostingsFormatForField(field);
      }
    }
  };
  doTestMixedPostings(codec);
}
 

import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
public LireCustomCodec() {
    super("LireCustomCodec", new Lucene42Codec());
}
 

import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
public AssertingCodec() {
  super("Asserting", new Lucene42Codec());
}
 

import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
public CheapBastardCodec() {
  super("CheapBastard", new Lucene42Codec());
}
 

import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
/**
 * Creates a compressing codec with a given segment suffix
 */
public CompressingCodec(String name, String segmentSuffix, CompressionMode compressionMode, int chunkSize) {
  super(name, new Lucene42Codec());
  this.storedFieldsFormat = new CompressingStoredFieldsFormat(name, segmentSuffix, compressionMode, chunkSize);
  this.termVectorsFormat = new CompressingTermVectorsFormat(name, segmentSuffix, compressionMode, chunkSize);
}
 

import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
public UnRegisteredCodec() {
  super("NotRegistered", new Lucene42Codec());
}
 

import org.apache.lucene.codecs.lucene42.Lucene42Codec; //导入依赖的package包/类
public MyCodec() {
	super("MyCodec", new Lucene42Codec());
	// TODO Auto-generated constructor stub
}