Registration of DevTools bridge in GCD.

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

Index: components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/gcd/MessageWriter.java
diff --git a/components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/gcd/MessageWriter.java b/components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/gcd/MessageWriter.java
new file mode 100644
index 0000000000000000000000000000000000000000..ee8ead6976233cb1f4ba1a006a2889620951740c
--- /dev/null
+++ b/components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/gcd/MessageWriter.java
@@ -0,0 +1,109 @@
+// 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.JsonWriter;
+
+import org.chromium.components.devtools_bridge.commands.Command;
+import org.chromium.components.devtools_bridge.commands.ParamDefinition;
+
+import java.io.IOException;
+import java.io.StringWriter;
+
+/**
+ * Helper class for constructing GCD JSON messages (HTTP requests) used in the DevTools bridge.
+ */
+public final class MessageWriter {
+    private final StringWriter mStringWriter;
+    private final JsonWriter mWriter;
+    boolean mClosed = false;
+
+    public MessageWriter() {
+        mStringWriter = new StringWriter();
+        mWriter = new JsonWriter(mStringWriter);
+    }
+
+    public MessageWriter close() throws IOException {
+        assert !mClosed;
+        mWriter.close();
+        mClosed = true;
+        return this;
+    }
+
+    @Override
+    public String toString() {
+        assert mClosed;
+        return mStringWriter.toString();
+    }
+
+    /**
+     * Write body of registrationTicket PATCH request.
+     */
+    public MessageWriter writeTicketPatch(InstanceDescription description) throws IOException {
+        mWriter.beginObject();
+        mWriter.name("deviceDraft");
+        writeDeviceDraft(description);
+        mWriter.name("oauthClientId").value(description.oAuthClientId);
+        mWriter.endObject();
+        return this;
+    }
+
+    private void writeDeviceDraft(InstanceDescription description) throws IOException {
+        mWriter.beginObject();
+        mWriter.name("deviceKind").value("vendor");
+        mWriter.name("displayName").value(description.displayName);
+        mWriter.name("systemName").value("Chrome DevTools Bridge");
+        mWriter.name("channel");
+        writeChannelDefinition(description);
+        mWriter.name("commandDefs");
+        writeCommandsDefinition();
+        mWriter.endObject();
+    }
+
+    private void writeChannelDefinition(InstanceDescription description) throws IOException {
+        mWriter.beginObject();
+        mWriter.name("supportedType").value("gcm");
+        mWriter.name("gcmRegistrationId").value(description.gcmChannelId);
+        mWriter.endObject();
+    }
+
+    private void writeCommandsDefinition() throws IOException {
+        mWriter.beginObject();
+        mWriter.name("base");
+        writeCommandsDefinitionBase();
+        mWriter.endObject();
+    }
+
+    private void writeCommandsDefinitionBase() throws IOException {
+        mWriter.beginObject();
+        for (Command.Type type : Command.Type.values()) {
+            mWriter.name(type.definition.shortName());
+            beginParameters();
+            for (ParamDefinition<?> param : type.definition.inParams()) {
+                writeParameter(param.name(), param.type());
+            }
+            endParameters();
+        }
+        mWriter.endObject();
+    }
+
+    private void beginParameters() throws IOException {
+        mWriter.beginObject();
+        mWriter.name("parameters");
+        mWriter.beginObject();
+    }
+
+    private void endParameters() throws IOException {
+        mWriter.endObject();
+        mWriter.endObject();
+    }
+
+    private void writeParameter(String name, String type) throws IOException {
+        mWriter.name(name);
+        mWriter.beginObject();
+        mWriter.name("type").value(type);
+        mWriter.endObject();
+    }
+}