Registration of DevTools bridge in GCD.

components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/apiary/JsonResponseHandler.java

Index: components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/apiary/JsonResponseHandler.java
diff --git a/components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/apiary/JsonResponseHandler.java b/components/devtools_bridge/android/java/src/org/chromium/components/devtools_bridge/apiary/JsonResponseHandler.java
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index 0000000000000000000000000000000000000000..1700cc52f40d442e9b0adeaf3d2d475af94254c3
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@@ -0,0 +1,70 @@
+// 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.apiary;
+
+import android.util.JsonReader;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.StatusLine;
+import org.apache.http.client.ClientProtocolException;
+import org.apache.http.client.HttpResponseException;
+import org.apache.http.client.ResponseHandler;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+/**
+ * Base class for a ResponseHandler that reads response with JsonReader. Like BasicResponseHandler
+ * throws HttpResponseException if response code >= 300.
+ *
+ * It catchs JsonReader's runtime exception (IllegalStateException and IllegalArgumentException)
+ * and wraps them into ResponseFormatException.
+ */
+abstract class JsonResponseHandler<T> implements ResponseHandler<T> {
+    public static void checkStatus(HttpResponse response) throws HttpResponseException {
+        StatusLine statusLine = response.getStatusLine();
+        if (response.getStatusLine().getStatusCode() >= 300) {
+            throw new HttpResponseException(
+                    statusLine.getStatusCode(), statusLine.getReasonPhrase());
+        }
+    }
+
+    @Override
+    public final T handleResponse(HttpResponse response)
+            throws IOException, ClientProtocolException {
+        checkStatus(response);
+        HttpEntity entity = response.getEntity();
+        if (entity == null) {
+            throw new ClientProtocolException("Missing content");
+        }
+        JsonReader reader = new JsonReader(new InputStreamReader(entity.getContent()));
+        try {
+            T result = readResponse(reader);
+            reader.close();
+
+            if (result == null) {
+                throw new ClientProtocolException("Missing result");
+            }
+
+            return result;
+        } catch (IllegalStateException e) {
+            throw new ResponseFormatException(e);
+        } catch (IllegalArgumentException e) {
+            throw new ResponseFormatException(e);
+        }
+    }
+
+    public abstract T readResponse(JsonReader reader)
+            throws IOException, ResponseFormatException;
+
+    public static class ResponseFormatException extends ClientProtocolException {
+        public ResponseFormatException(RuntimeException readerException) {
+            super(readerException);
+        }
+
+        public ResponseFormatException() {}
+    }
+}