Registration of DevTools bridge in GCD.

components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/gcd/MessageReader.java

Index: components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/gcd/MessageReader.java
diff --git a/components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/gcd/MessageReader.java b/components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/gcd/MessageReader.java
new file mode 100644
index 0000000000000000000000000000000000000000..382979dbe0a1e5770943ffa2450d144a355feb77
--- /dev/null
+++ b/components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/gcd/MessageReader.java
@@ -0,0 +1,84 @@
+// 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.components.devtools_bridge.gcd;
+
+import android.util.JsonReader;
+
+import java.io.IOException;
+
+/**
+ * Helper class for parsing JSON-encoded GCD messages (HTTP responses and GCM notifications) used
+ * in the DevTools bridge.
+ */
+public final class MessageReader {
+    private final JsonReader mReader;
+
+    public MessageReader(JsonReader reader) {
+        mReader = reader;
+    }
+
+    /**
+     * Reads id from a registration ticket.
+     */
+    public String readTicketId() throws IOException {
+        return new TicketReader().readId();
+    }
+
+    /**
+     * Reads credentials from finalized registration ticket.
+     */
+    public InstanceCredential readInstanceCredential() throws IOException {
+        return new TicketReader().readCredential();
+    }
+
+    private abstract class ObjectReader {
+        public final void readObject() throws IOException {
+            mReader.beginObject();
+            while (mReader.hasNext()) {
+                readItem(mReader.nextName());
+            }
+            mReader.endObject();
+        }
+
+        protected void readItem(String name) throws IOException {
+            mReader.skipValue();
+        }
+    }
+
+    private class TicketReader extends ObjectReader {
+        private String mId;
+        private String mDeviceId;
+        private String mDeviceSecret;
+
+        public String readId() throws IOException {
+            readObject();
+            if (mId == null) {
+                throw new IllegalArgumentException();
+            }
+            return mId;
+        }
+
+        public InstanceCredential readCredential() throws IOException {
+            readObject();
+            if (mDeviceId == null || mDeviceSecret == null) {
+                throw new IllegalArgumentException();
+            }
+            return new InstanceCredential(mDeviceId, mDeviceSecret);
+        }
+
+        @Override
+        protected void readItem(String name) throws IOException {
+            if (name.equals("id")) {
+                mId = mReader.nextString();
+            } else if (name.equals("deviceId")) {
+                mDeviceId = mReader.nextString();
+            } else if (name.equals("robotAccountAuthorizationCode")) {
+                mDeviceSecret = mReader.nextString();
+            } else {
+                super.readItem(name);
+            }
+        }
+    }
+}