LUCENE-5969: javadocs

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene5969@1629406 13f79535-47bb-0310-9956-ffa450edef68

lucene/backward-codecs/src/java/org/apache/lucene/codecs/lucene40/Lucene40CompoundFormat.java

@@ -34,6 +34,10 @@ import org.apache.lucene.store.IOContext;
 @Deprecated
 public final class Lucene40CompoundFormat extends CompoundFormat {
   
+  /** Sole constructor. */
+  public Lucene40CompoundFormat() {
+  }
+
   @Override
   public Directory getCompoundReader(Directory dir, SegmentInfo si, IOContext context) throws IOException {
     String fileName = IndexFileNames.segmentFileName(si.name, "", COMPOUND_FILE_EXTENSION);

lucene/codecs/src/java/org/apache/lucene/codecs/simpletext/SimpleTextCompoundFormat.java

@@ -50,6 +50,10 @@ import org.apache.lucene.util.StringHelper;
  */
 public class SimpleTextCompoundFormat extends CompoundFormat {
   
+  /** Sole constructor. */
+  public SimpleTextCompoundFormat() {
+  }
+
   @Override
   public Directory getCompoundReader(Directory dir, SegmentInfo si, IOContext context) throws IOException {
     String dataFile = IndexFileNames.segmentFileName(si.name, "", DATA_EXTENSION);

lucene/core/src/java/org/apache/lucene/codecs/CompoundFormat.java

@@ -50,6 +50,9 @@ public abstract class CompoundFormat {
   // TODO: get checkAbort out of here, and everywhere, and have iw do it at a higher level
   public abstract void write(Directory dir, SegmentInfo si, Collection<String> files, CheckAbort checkAbort, IOContext context) throws IOException;
 
+  /**
+   * Returns the compound file names used by this segment.
+   */
   // TODO: get this out of here, and use trackingdirwrapper. but this is really scary in IW right now...
   // NOTE: generally si.useCompoundFile is not even yet 'set' when this is called.
   public abstract String[] files(SegmentInfo si);

lucene/core/src/java/org/apache/lucene/codecs/lucene50/Lucene50CompoundFormat.java

@@ -63,6 +63,10 @@ import org.apache.lucene.store.IndexOutput;
  */
 public final class Lucene50CompoundFormat extends CompoundFormat {
 
+  /** Sole constructor. */
+  public Lucene50CompoundFormat() {
+  }
+  
   @Override
   public Directory getCompoundReader(Directory dir, SegmentInfo si, IOContext context) throws IOException {
     return new Lucene50CompoundReader(dir, si, context);

lucene/core/src/java/org/apache/lucene/codecs/lucene50/package.html

@@ -243,7 +243,7 @@ file.</td>
 <td>Stores metadata about a segment</td>
 </tr>
 <tr>
-<td>{@link org.apache.lucene.codecs.lucene50.LUcene50CompoundFormat Compound File}</td>
+<td>{@link org.apache.lucene.codecs.lucene50.Lucene50CompoundFormat Compound File}</td>
 <td>.cfs, .cfe</td>
 <td>An optional "virtual" file consisting of all the other index files for
 systems that frequently run out of file handles.</td>