improve exception mapping

scm-webapp/src/main/java/sonia/scm/api/rest/StatusExceptionMapper.java

@@ -0,0 +1,106 @@
+/**
+ * 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.api.rest;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import javax.ws.rs.core.Response;
+import javax.ws.rs.ext.ExceptionMapper;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ * @param <E>
+ */
+public class StatusExceptionMapper<E extends Throwable>
+  implements ExceptionMapper<E>
+{
+
+  /**
+   * the logger for StatusExceptionMapper
+   */
+  private static final Logger logger =
+    LoggerFactory.getLogger(StatusExceptionMapper.class);
+
+  //~--- constructors ---------------------------------------------------------
+
+  /**
+   * Constructs ...
+   *
+   *
+   * @param type
+   * @param status
+   */
+  public StatusExceptionMapper(Class<E> type, Response.Status status)
+  {
+    this.type = type;
+    this.status = status;
+  }
+
+  //~--- methods --------------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @param exception
+   *
+   * @return
+   */
+  @Override
+  public Response toResponse(E exception)
+  {
+    if (logger.isDebugEnabled())
+    {
+      StringBuilder msg = new StringBuilder();
+
+      msg.append("map ").append(type.getSimpleName()).append("to status code ");
+      msg.append(status.getStatusCode());
+      logger.debug(msg.toString());
+    }
+
+    return Response.status(status).build();
+  }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** Field description */
+  private final Response.Status status;
+
+  /** Field description */
+  private final Class<E> type;
+}