Move useful printing backend code from chrome/service/cloud_print to printing/backend.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/3945003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@63772 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 70 insertions, 0 deletions

diff --git a/printing/backend/print_backend.h b/printing/backend/print_backend.h
new file mode 100644
index 0000000..3b55268
--- /dev/null
+++ b/printing/backend/print_backend.h
@@ -0,0 +1,70 @@
+// Copyright (c) 2010 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.
+
+#ifndef PRINTING_BACKEND_PRINT_BACKEND_H_
+#define PRINTING_BACKEND_PRINT_BACKEND_H_
+#pragma once
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/ref_counted.h"
+
+class DictionaryValue;
+
+// This is the interface for platform-specific code for a print backend
+namespace printing {
+
+struct PrinterBasicInfo {
+  PrinterBasicInfo();
+  ~PrinterBasicInfo();
+
+  std::string printer_name;
+  std::string printer_description;
+  int printer_status;
+  std::map<std::string, std::string> options;
+};
+
+typedef std::vector<PrinterBasicInfo> PrinterList;
+
+struct PrinterCapsAndDefaults {
+  std::string printer_capabilities;
+  std::string caps_mime_type;
+  std::string printer_defaults;
+  std::string defaults_mime_type;
+};
+
+// PrintBackend class will provide interface for different print backends
+// (Windows, CUPS) to implement. User will call CreateInstance() to
+// obtain available print backend.
+// Please note, that PrintBackend is not platform specific, but rather
+// print system specific. For example, CUPS is available on both Linux and Mac,
+// but not available on ChromeOS, etc. This design allows us to add more
+// functionality on some platforms, while reusing core (CUPS) functions.
+class PrintBackend : public base::RefCountedThreadSafe<PrintBackend> {
+ public:
+  virtual ~PrintBackend();
+
+  // Enumerates the list of installed local and network printers.
+  virtual void EnumeratePrinters(PrinterList* printer_list) = 0;
+
+  // Gets the capabilities and defaults for a specific printer.
+  virtual bool GetPrinterCapsAndDefaults(
+      const std::string& printer_name,
+      PrinterCapsAndDefaults* printer_info) = 0;
+
+  // Returns true if printer_name points to a valid printer.
+  virtual bool IsValidPrinter(const std::string& printer_name) = 0;
+
+  // Allocate a print backend. If |print_backend_settings| is NULL, default
+  // settings will be used.
+  // Return NULL if no print backend available.
+  static scoped_refptr<PrintBackend> CreateInstance(
+      const DictionaryValue* print_backend_settings);
+};
+
+}  // namespace printing
+
+#endif  // PRINTING_BACKEND_PRINT_BACKEND_H_