1 files changed, 92 insertions, 0 deletions
diff --git a/cpp/src/qpid/Options.cpp b/cpp/src/qpid/Options.cpp
new file mode 100644
index 0000000000..18a3f726f9
--- /dev/null
+++ b/cpp/src/qpid/Options.cpp
@@ -0,0 +1,92 @@
+/*
+ *
+ * Copyright (c) 2006 The Apache Software Foundation
+ *
+ * Licensed 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.
+ *
+ */
+
+#include "Options.h"
+#include "qpid/Exception.h"
+#include <fstream>
+#include <algorithm>
+#include <iostream>
+
+namespace qpid {
+
+using namespace std;
+
+namespace {
+const std::string prefix("QPID_");
+char env2optchar(char env) { return (env=='_') ? '-' : tolower(env); }
+
+struct Mapper {
+    Mapper(const Options& o) : opts(o) {}
+    string operator()(const string& env) {
+        if (env.substr(0, prefix.size()) == prefix) {
+            string opt = env.substr(prefix.size());
+            transform(opt.begin(), opt.end(), opt.begin(), env2optchar);
+            // Ignore env vars that don't match to known options.
+            if (opts.find_nothrow(opt, false))
+                return opt;
+        }
+        return string();
+    }
+    const Options& opts;
+};
+
+}
+std::string prettyArg(const std::string& name, const std::string& value) {
+    return value.empty() ? name : name+" (="+value+")";
+}
+
+Options::Options(const string& name) : po::options_description(name) {}
+
+void Options::parse(int argc, char** argv, const std::string& configFile)
+{
+    string parsing;
+    try {
+        po::variables_map vm;
+        parsing="command line options";
+        po::store(po::parse_command_line(argc, argv, *this), vm);
+        parsing="environment variables";
+        po::store(po::parse_environment(*this, Mapper(*this)), vm);
+        po::notify(vm); // configFile may be updated from arg/env options.
+        if (!configFile.empty()) {
+            parsing="configuration file "+configFile;
+            ifstream conf(configFile.c_str());
+            if (conf.good()) {
+                conf.exceptions(ifstream::failbit|ifstream::badbit);
+                po::store(po::parse_config_file(conf, *this), vm);
+            }
+        }
+        po::notify(vm);
+    }
+    catch (const std::exception& e) {
+        ostringstream msg;
+        msg << "Error in " << parsing << ": " << e.what() << endl;
+        if (find_nothrow("help", false))
+            msg << "Use --help to see valid options" << endl;
+        throw Exception(msg.str());
+    }
+}
+
+CommonOptions::CommonOptions(const string& name) : Options(name) {
+    addOptions()
+        ("help,h", optValue(help), "Print help message.")
+        ("version,v", optValue(version), "Print version information.")
+        ("config", optValue(config, "FILE"), "Configuation file.");
+}
+
+} // namespace qpid
+