[Cronet] Initial implementation of HttpURLConnection

components/cronet/android/java/src/org/chromium/net/urlconnection/ByteBufferInputStream.java

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.net.urlconnection;
+
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+
+/**
+ * Wrapper class to construct an InputSteam based on a ByteBuffer.
+ */
+class ByteBufferInputStream extends InputStream {
+    private final MessageLoop mMessageLoop;
+    // Indicates whether listener's onSucceeded or onFailed callback is invoked.
+    private boolean mResponseDataCompleted;
+    private ByteBuffer mBuffer;
+
+    public ByteBufferInputStream(MessageLoop messageLoop) {
+        mMessageLoop = messageLoop;
+    }
+
+    @Override
+    public int read() {
+        if (mBuffer == null
+                || (!mBuffer.hasRemaining() && !mResponseDataCompleted)) {
+            mMessageLoop.loop();
+        }
+        if (mBuffer.hasRemaining()) {
+            return mBuffer.get() & 0xFF;
+        }
+        return -1;
+    }
+
+    public void setResponseDataCompleted() {
+        mResponseDataCompleted = true;
+    }
+
+    public void setByteBuffer(ByteBuffer buffer) {
+        mBuffer = buffer;
+    }
+}