make 4.1 codec read-only and add impersonator for testing

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene4547@1436558 13f79535-47bb-0310-9956-ffa450edef68

lucene/core/src/java/org/apache/lucene/codecs/lucene41/Lucene41Codec.java

@@ -17,6 +17,8 @@ package org.apache.lucene.codecs.lucene41;
  * limitations under the License.
  */
 
+import java.io.IOException;
+
 import org.apache.lucene.codecs.Codec;
 import org.apache.lucene.codecs.FieldInfosFormat;
 import org.apache.lucene.codecs.FilterCodec;
@@ -26,13 +28,19 @@ import org.apache.lucene.codecs.SegmentInfoFormat;
 import org.apache.lucene.codecs.DocValuesFormat;
 import org.apache.lucene.codecs.NormsFormat;
 import org.apache.lucene.codecs.StoredFieldsFormat;
+import org.apache.lucene.codecs.StoredFieldsWriter;
 import org.apache.lucene.codecs.TermVectorsFormat;
+import org.apache.lucene.codecs.compressing.CompressingStoredFieldsFormat;
+import org.apache.lucene.codecs.compressing.CompressionMode;
 import org.apache.lucene.codecs.lucene40.Lucene40FieldInfosFormat;
 import org.apache.lucene.codecs.lucene40.Lucene40LiveDocsFormat;
 import org.apache.lucene.codecs.lucene40.Lucene40SegmentInfoFormat;
 import org.apache.lucene.codecs.lucene40.Lucene40TermVectorsFormat;
 import org.apache.lucene.codecs.lucene42.Lucene42NormsFormat;
 import org.apache.lucene.codecs.perfield.PerFieldPostingsFormat;
+import org.apache.lucene.index.SegmentInfo;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.store.IOContext;
 
 /**
  * Implements the Lucene 4.1 index format, with configurable per-field postings formats.
@@ -41,11 +49,18 @@ import org.apache.lucene.codecs.perfield.PerFieldPostingsFormat;
  * {@link FilterCodec}.
  *
  * @see org.apache.lucene.codecs.lucene41 package documentation for file format details.
+ * @deprecated Only for reading old 4.0 segments
  * @lucene.experimental
  */
-// nocommit: make readonly
+@Deprecated
 public class Lucene41Codec extends Codec {
-  private final StoredFieldsFormat fieldsFormat = new Lucene41StoredFieldsFormat();
+  // TODO: slightly evil
+  private final StoredFieldsFormat fieldsFormat = new CompressingStoredFieldsFormat("Lucene41StoredFields", CompressionMode.FAST, 1 << 14) {
+    @Override
+    public StoredFieldsWriter fieldsWriter(Directory directory, SegmentInfo si, IOContext context) throws IOException {
+      throw new UnsupportedOperationException("this codec can only be used for reading");
+    }
+  };
   private final TermVectorsFormat vectorsFormat = new Lucene40TermVectorsFormat();
   private final FieldInfosFormat fieldInfosFormat = new Lucene40FieldInfosFormat();
   private final SegmentInfoFormat infosFormat = new Lucene40SegmentInfoFormat();
@@ -63,8 +78,9 @@ public class Lucene41Codec extends Codec {
     super("Lucene41");
   }
   
+  // TODO: slightly evil
   @Override
-  public final StoredFieldsFormat storedFieldsFormat() {
+  public StoredFieldsFormat storedFieldsFormat() {
     return fieldsFormat;
   }
   

lucene/test-framework/src/java/org/apache/lucene/codecs/lucene41/Lucene41RWCodec.java

@@ -0,0 +1,32 @@
+package org.apache.lucene.codecs.lucene41;
+
+import org.apache.lucene.codecs.StoredFieldsFormat;
+
+/*
+ * 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.
+ */
+
+/**
+ * Read-write version of {@link Lucene41Codec} for testing.
+ */
+public class Lucene41RWCodec extends Lucene41Codec {
+  private final StoredFieldsFormat fieldsFormat = new Lucene41StoredFieldsFormat();
+
+  @Override
+  public StoredFieldsFormat storedFieldsFormat() {
+    return fieldsFormat;
+  }
+}

lucene/test-framework/src/java/org/apache/lucene/codecs/lucene41/package.html

@@ -0,0 +1,25 @@
+<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
+<!--
+ 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.
+-->
+<html>
+<head>
+   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+</head>
+<body>
+Support for testing {@link org.apache.lucene.codecs.lucene41.Lucene41Codec}.
+</body>
+</html>

lucene/test-framework/src/resources/META-INF/services/org.apache.lucene.codecs.Codec

@@ -18,3 +18,4 @@ org.apache.lucene.codecs.compressing.FastCompressingCodec
 org.apache.lucene.codecs.compressing.FastDecompressionCompressingCodec
 org.apache.lucene.codecs.compressing.HighCompressionCompressingCodec
 org.apache.lucene.codecs.compressing.dummy.DummyCompressingCodec
+org.apache.lucene.codecs.lucene41.Lucene41RWCodec