added RegistryUtil

scm-core/src/main/java/sonia/scm/util/RegistryUtil.java

@@ -0,0 +1,156 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of SCM-Manager; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.util;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import sonia.scm.io.SimpleCommand;
+import sonia.scm.io.SimpleCommandResult;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.io.IOException;
+
+import java.util.Scanner;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+public class RegistryUtil
+{
+
+  /** the logger for RegistryUtil */
+  private static final Logger logger =
+    LoggerFactory.getLogger(RegistryUtil.class);
+
+  //~--- get methods ----------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @param key
+   *
+   * @return
+   */
+  public static String getRegistryValue(String key)
+  {
+    return getRegistryValue(key, null, null);
+  }
+
+  /**
+   * Method description
+   *
+   *
+   * @param key
+   * @param defaultValue
+   *
+   * @return
+   */
+  public static String getRegistryValue(String key, String defaultValue)
+  {
+    return getRegistryValue(key, null, defaultValue);
+  }
+
+  /**
+   * Method description
+   *
+   *
+   * @param key
+   * @param subKey
+   * @param defaultValue
+   *
+   * @return
+   */
+  public static String getRegistryValue(String key, String subKey,
+          String defaultValue)
+  {
+    String value = defaultValue;
+    SimpleCommand command = null;
+
+    if (subKey != null)
+    {
+      command = new SimpleCommand("reg", "query", key, "/v", subKey);
+    }
+    else
+    {
+      command = new SimpleCommand("reg", "query", key);
+    }
+
+    try
+    {
+      SimpleCommandResult result = command.execute();
+
+      if (result.isSuccessfull())
+      {
+        String output = result.getOutput();
+        Scanner scanner = new Scanner(output);
+
+        while (scanner.hasNextLine())
+        {
+          String line = scanner.nextLine();
+          int index = line.indexOf("REG_SZ");
+
+          if (index > 0)
+          {
+            value = line.substring(index + "REG_SZ".length()).trim();
+
+            if (value.startsWith("\""))
+            {
+              value = value.substring(1);
+              value = value.substring(0, value.indexOf("\""));
+            }
+
+            if (logger.isDebugEnabled())
+            {
+              logger.debug("registry value {} at {}", value, key);
+            }
+
+            break;
+          }
+        }
+      }
+    }
+    catch (IOException ex)
+    {
+      logger.error(ex.getMessage(), ex);
+    }
+
+    return value;
+  }
+}