Initial checkin.

git-svn-id: https://leveldb.googlecode.com/svn/trunk@2 62dab493-f737-651d-591e-8d6aee1b9529

db/write_batch_internal.h

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+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
+#define STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
+
+#include "include/write_batch.h"
+
+namespace leveldb {
+
+// WriteBatchInternal provides static methods for manipulating a
+// WriteBatch that we don't want in the public WriteBatch interface.
+class WriteBatchInternal {
+ public:
+  static void PutLargeValueRef(WriteBatch* batch,
+                               const Slice& key,
+                               const LargeValueRef& large_ref);
+
+  // Return the number of entries in the batch.
+  static int Count(const WriteBatch* batch);
+
+  // Set the count for the number of entries in the batch.
+  static void SetCount(WriteBatch* batch, int n);
+
+  // Return the seqeunce number for the start of this batch.
+  static SequenceNumber Sequence(const WriteBatch* batch);
+
+  // Store the specified number as the seqeunce number for the start of
+  // this batch.
+  static void SetSequence(WriteBatch* batch, SequenceNumber seq);
+
+  static Slice Contents(const WriteBatch* batch) {
+    return Slice(batch->rep_);
+  }
+
+  static size_t ByteSize(const WriteBatch* batch) {
+    return batch->rep_.size();
+  }
+
+  static void SetContents(WriteBatch* batch, const Slice& contents);
+
+  static Status InsertInto(const WriteBatch* batch, MemTable* memtable);
+
+  // Iterate over the contents of a write batch.
+  class Iterator {
+   public:
+    explicit Iterator(const WriteBatch& batch);
+    bool Done() const { return done_; }
+    void Next();
+    ValueType op() const { return op_; }
+    const Slice& key() const { return key_; }
+    const Slice& value() const { return value_; }
+    SequenceNumber sequence_number() const { return seq_; }
+    Status status() const { return status_; }
+
+   private:
+    void GetNextEntry();
+
+    Slice input_;
+    bool done_;
+    ValueType op_;
+    Slice key_;
+    Slice value_;
+    SequenceNumber seq_;
+    Status status_;
+  };
+};
+
+}
+
+
+#endif  // STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_