1 files changed, 102 insertions, 0 deletions
diff --git a/src/org/apache/harmony/javax/security/auth/login/Configuration.java b/src/org/apache/harmony/javax/security/auth/login/Configuration.java
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index 0000000..74c371f
--- /dev/null
+++ b/src/org/apache/harmony/javax/security/auth/login/Configuration.java
@@ -0,0 +1,102 @@
+/*
+ *  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.
+ */
+
+package org.apache.harmony.javax.security.auth.login;
+
+import java.security.AccessController;
+import org.apache.harmony.javax.security.auth.AuthPermission;
+
+public abstract class Configuration {
+
+    // the current configuration 
+    private static Configuration configuration;
+
+    // creates a AuthPermission object with a specify property
+    private static final AuthPermission GET_LOGIN_CONFIGURATION = new AuthPermission(
+            "getLoginConfiguration"); //$NON-NLS-1$
+
+    // creates a AuthPermission object with a specify property
+    private static final AuthPermission SET_LOGIN_CONFIGURATION = new AuthPermission(
+            "setLoginConfiguration"); //$NON-NLS-1$
+
+    // Key to security properties, defining default configuration provider.
+    private static final String LOGIN_CONFIGURATION_PROVIDER = "login.configuration.provider"; //$NON-NLS-1$
+
+    protected Configuration() {
+        super();
+    }
+
+    public static Configuration getConfiguration() {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            sm.checkPermission(GET_LOGIN_CONFIGURATION);
+        }
+        return getAccessibleConfiguration();
+    }
+
+    /**
+     * Reads name of default configuration provider from security.properties,
+     * loads the class and instantiates the provider.<br> In case of any
+     * exception, wraps it with SecurityException and throws further.
+     */
+    private static final Configuration getDefaultProvider() {
+        return new Configuration() {
+			
+			@Override
+			public void refresh() {
+			}
+			
+			@Override
+			public AppConfigurationEntry[] getAppConfigurationEntry(
+					String applicationName) {
+				return new AppConfigurationEntry[0];
+			}
+		};
+    }
+
+    /**
+     * Shortcut accessor for friendly classes, to skip security checks.
+     * If active configuration was set to <code>null</code>, tries to load a default 
+     * provider, so this method never returns <code>null</code>. <br>
+     * This method is synchronized with setConfiguration()
+     */
+    static Configuration getAccessibleConfiguration() {
+        Configuration current = configuration;
+        if (current == null) {
+            synchronized (Configuration.class) {
+                if (configuration == null) {
+                    configuration = getDefaultProvider();
+                }
+                return configuration;
+            }
+        }
+        return current;
+    }
+
+    public static void setConfiguration(Configuration configuration) {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            sm.checkPermission(SET_LOGIN_CONFIGURATION);
+        }
+        Configuration.configuration = configuration;
+    }
+
+    public abstract AppConfigurationEntry[] getAppConfigurationEntry(String applicationName);
+
+    public abstract void refresh();
+
+}