LUCENE-4672: add AssertingStoredFieldsFormat

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1431024 13f79535-47bb-0310-9956-ffa450edef68

lucene/test-framework/src/java/org/apache/lucene/codecs/asserting/AssertingCodec.java

@@ -19,6 +19,7 @@ package org.apache.lucene.codecs.asserting;
 
 import org.apache.lucene.codecs.FilterCodec;
 import org.apache.lucene.codecs.PostingsFormat;
+import org.apache.lucene.codecs.StoredFieldsFormat;
 import org.apache.lucene.codecs.TermVectorsFormat;
 import org.apache.lucene.codecs.lucene41.Lucene41Codec;
 
@@ -29,6 +30,7 @@ public final class AssertingCodec extends FilterCodec {
 
   private final PostingsFormat postings = new AssertingPostingsFormat();
   private final TermVectorsFormat vectors = new AssertingTermVectorsFormat();
+  private final StoredFieldsFormat storedFields = new AssertingStoredFieldsFormat();
 
   public AssertingCodec() {
     super("Asserting", new Lucene41Codec());
@@ -44,4 +46,8 @@ public final class AssertingCodec extends FilterCodec {
     return vectors;
   }
 
+  @Override
+  public StoredFieldsFormat storedFieldsFormat() {
+    return storedFields;
+  }
 }

lucene/test-framework/src/java/org/apache/lucene/codecs/asserting/AssertingStoredFieldsFormat.java

@@ -0,0 +1,117 @@
+package org.apache.lucene.codecs.asserting;
+
+/*
+ * 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.codecs.StoredFieldsFormat;
+import org.apache.lucene.codecs.StoredFieldsReader;
+import org.apache.lucene.codecs.StoredFieldsWriter;
+import org.apache.lucene.codecs.lucene41.Lucene41StoredFieldsFormat;
+import org.apache.lucene.index.FieldInfo;
+import org.apache.lucene.index.FieldInfos;
+import org.apache.lucene.index.SegmentInfo;
+import org.apache.lucene.index.StorableField;
+import org.apache.lucene.index.StoredFieldVisitor;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.store.IOContext;
+
+/**
+ * Just like {@link Lucene41StoredFieldsFormat} but with additional asserts.
+ */
+public class AssertingStoredFieldsFormat extends StoredFieldsFormat {
+  private final StoredFieldsFormat in = new Lucene41StoredFieldsFormat();
+
+  @Override
+  public StoredFieldsReader fieldsReader(Directory directory, SegmentInfo si, FieldInfos fn, IOContext context) throws IOException {
+    return new AssertingStoredFieldsReader(in.fieldsReader(directory, si, fn, context), si.getDocCount());
+  }
+
+  @Override
+  public StoredFieldsWriter fieldsWriter(Directory directory, SegmentInfo si, IOContext context) throws IOException {
+    return new AssertingStoredFieldsWriter(in.fieldsWriter(directory, si, context));
+  }
+  
+  static class AssertingStoredFieldsReader extends StoredFieldsReader {
+    private final StoredFieldsReader in;
+    private final int maxDoc;
+    
+    AssertingStoredFieldsReader(StoredFieldsReader in, int maxDoc) {
+      this.in = in;
+      this.maxDoc = maxDoc;
+    }
+    
+    @Override
+    public void close() throws IOException {
+      in.close();
+    }
+
+    @Override
+    public void visitDocument(int n, StoredFieldVisitor visitor) throws IOException {
+      assert n >= 0 && n < maxDoc;
+      in.visitDocument(n, visitor);
+    }
+
+    @Override
+    public StoredFieldsReader clone() {
+      return new AssertingStoredFieldsReader(in.clone(), maxDoc);
+    }
+  }
+  
+  static class AssertingStoredFieldsWriter extends StoredFieldsWriter {
+    private final StoredFieldsWriter in;
+    private int numWritten;
+    private int fieldCount;
+    
+    AssertingStoredFieldsWriter(StoredFieldsWriter in) {
+      this.in = in;
+    }
+
+    @Override
+    public void startDocument(int numStoredFields) throws IOException {
+      in.startDocument(numStoredFields);
+      assert fieldCount == 0;
+      fieldCount = numStoredFields;
+      numWritten++;
+    }
+
+    @Override
+    public void writeField(FieldInfo info, StorableField field) throws IOException {
+      in.writeField(info, field);
+      assert fieldCount > 0;
+      fieldCount--;
+    }
+
+    @Override
+    public void abort() {
+      in.abort();
+    }
+
+    @Override
+    public void finish(FieldInfos fis, int numDocs) throws IOException {
+      in.finish(fis, numDocs);
+      assert fieldCount == 0;
+      assert numDocs == numWritten;
+    }
+
+    @Override
+    public void close() throws IOException {
+      in.close();
+    }
+  }
+}