Bug 709391 - initial import of Android Sync code (Git tag: v0.1.2-fixes). a=java-only

mobile/android/base/httpclientandroidlib/protocol/RequestConnControl.java

@@ -0,0 +1,68 @@
+/*
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package ch.boye.httpclientandroidlib.protocol;
+
+import java.io.IOException;
+
+import ch.boye.httpclientandroidlib.HttpException;
+import ch.boye.httpclientandroidlib.HttpRequest;
+import ch.boye.httpclientandroidlib.HttpRequestInterceptor;
+
+/**
+ * RequestConnControl is responsible for adding <code>Connection</code> header
+ * to the outgoing requests, which is essential for managing persistence of
+ * <code>HTTP/1.0</code> connections. This interceptor is recommended for
+ * client side protocol processors.
+ *
+ * @since 4.0
+ */
+public class RequestConnControl implements HttpRequestInterceptor {
+
+    public RequestConnControl() {
+        super();
+    }
+
+    public void process(final HttpRequest request, final HttpContext context)
+            throws HttpException, IOException {
+        if (request == null) {
+            throw new IllegalArgumentException("HTTP request may not be null");
+        }
+
+        String method = request.getRequestLine().getMethod();
+        if (method.equalsIgnoreCase("CONNECT")) {
+            return;
+        }
+
+        if (!request.containsHeader(HTTP.CONN_DIRECTIVE)) {
+            // Default policy is to keep connection alive
+            // whenever possible
+            request.addHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_KEEP_ALIVE);
+        }
+    }
+
+}