content: /*
   * 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.chemistry.opencmis.server.shared;
  
  import java.io.PrintWriter;
  import java.io.StringWriter;
  
  import org.apache.chemistry.opencmis.commons.impl.XMLUtils;
  import org.w3c.dom.Document;
  import org.w3c.dom.Element;
  import org.w3c.dom.Node;
  
  public final class ExceptionHelper {
  
      /**
       * System property to enable stack traces in CMIS exceptions.
       */
      public static final String ENABLE_STACK_TRACE_PROPERTY = "org.apache.chemistry.opencmis.stacktrace.enable";
  
      private static final boolean SEND_STACK_TRACE;
  
      static {
          SEND_STACK_TRACE = Boolean.parseBoolean(System.getProperty(ENABLE_STACK_TRACE_PROPERTY, "false"));
      }
  
      private ExceptionHelper() {
      }
  
      /**
       * Returns the stack trace as string.
       */
      public static String getStacktraceAsString(Throwable t) {
          if (!SEND_STACK_TRACE || t == null) {
              return null;
          }
  
          StringWriter sw = new StringWriter(512);
          PrintWriter pw = new PrintWriter(sw);
  
          t.printStackTrace(pw);
  
          return sw.toString();
      }
  
      /**
       * Returns the stack trace as DOM node.
       */
      public static Node getStacktraceAsNode(Throwable t) {
          try {
              String st = getStacktraceAsString(t);
              if (st != null) {
                  Document doc = XMLUtils.newDomDocument();
  
                  Element node = doc.createElementNS("http://chemistry.apache.org/opencmis/exception", "stacktrace");
                  doc.appendChild(node);
  
                  node.appendChild(doc.createTextNode(XMLUtils.cleanXmlString(st)));
  
                  return node;
              }
          } catch (Exception e) {
              assert false;
          }
  
          return null;
      }
  }
  