1 files changed, 81 insertions, 0 deletions
diff --git a/jimfs/src/main/java/com/google/common/jimfs/DowngradedSeekableByteChannel.java b/jimfs/src/main/java/com/google/common/jimfs/DowngradedSeekableByteChannel.java
new file mode 100644
index 0000000..5d4db8b
--- /dev/null
+++ b/jimfs/src/main/java/com/google/common/jimfs/DowngradedSeekableByteChannel.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Licensed 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.
+ */
+
+package com.google.common.jimfs;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.channels.SeekableByteChannel;
+
+/**
+ * A thin wrapper around a {@link FileChannel} that exists only to implement {@link
+ * SeekableByteChannel} but NOT extend {@link FileChannel}.
+ *
+ * @author Colin Decker
+ */
+final class DowngradedSeekableByteChannel implements SeekableByteChannel {
+
+  private final FileChannel channel;
+
+  DowngradedSeekableByteChannel(FileChannel channel) {
+    this.channel = checkNotNull(channel);
+  }
+
+  @Override
+  public int read(ByteBuffer dst) throws IOException {
+    return channel.read(dst);
+  }
+
+  @Override
+  public int write(ByteBuffer src) throws IOException {
+    return channel.write(src);
+  }
+
+  @Override
+  public long position() throws IOException {
+    return channel.position();
+  }
+
+  @Override
+  public SeekableByteChannel position(long newPosition) throws IOException {
+    channel.position(newPosition);
+    return this;
+  }
+
+  @Override
+  public long size() throws IOException {
+    return channel.size();
+  }
+
+  @Override
+  public SeekableByteChannel truncate(long size) throws IOException {
+    channel.truncate(size);
+    return this;
+  }
+
+  @Override
+  public boolean isOpen() {
+    return channel.isOpen();
+  }
+
+  @Override
+  public void close() throws IOException {
+    channel.close();
+  }
+}