1 files changed, 98 insertions, 0 deletions
diff --git a/jimfs/src/test/java/com/google/common/jimfs/ByteBufferChannel.java b/jimfs/src/test/java/com/google/common/jimfs/ByteBufferChannel.java
new file mode 100644
index 0000000..7428975
--- /dev/null
+++ b/jimfs/src/test/java/com/google/common/jimfs/ByteBufferChannel.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2013 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 java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.SeekableByteChannel;
+
+/** @author Colin Decker */
+public class ByteBufferChannel implements SeekableByteChannel {
+
+  private final ByteBuffer buffer;
+
+  public ByteBufferChannel(byte[] bytes) {
+    this.buffer = ByteBuffer.wrap(bytes);
+  }
+
+  public ByteBufferChannel(byte[] bytes, int offset, int length) {
+    this.buffer = ByteBuffer.wrap(bytes, offset, length);
+  }
+
+  public ByteBufferChannel(int capacity) {
+    this.buffer = ByteBuffer.allocate(capacity);
+  }
+
+  public ByteBufferChannel(ByteBuffer buffer) {
+    this.buffer = buffer;
+  }
+
+  public ByteBuffer buffer() {
+    return buffer;
+  }
+
+  @Override
+  public int read(ByteBuffer dst) throws IOException {
+    if (buffer.remaining() == 0) {
+      return -1;
+    }
+    int length = Math.min(dst.remaining(), buffer.remaining());
+    for (int i = 0; i < length; i++) {
+      dst.put(buffer.get());
+    }
+    return length;
+  }
+
+  @Override
+  public int write(ByteBuffer src) throws IOException {
+    int length = Math.min(src.remaining(), buffer.remaining());
+    for (int i = 0; i < length; i++) {
+      buffer.put(src.get());
+    }
+    return length;
+  }
+
+  @Override
+  public long position() throws IOException {
+    return buffer.position();
+  }
+
+  @Override
+  public SeekableByteChannel position(long newPosition) throws IOException {
+    buffer.position((int) newPosition);
+    return this;
+  }
+
+  @Override
+  public long size() throws IOException {
+    return buffer.limit();
+  }
+
+  @Override
+  public SeekableByteChannel truncate(long size) throws IOException {
+    buffer.limit((int) size);
+    return this;
+  }
+
+  @Override
+  public boolean isOpen() {
+    return true;
+  }
+
+  @Override
+  public void close() throws IOException {}
+}