content: package act.view;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.app.*;
  import org.osgl.util.S;
  
  import java.util.List;
  
  /**
   * Base class for Template error
   */
  public abstract class TemplateException extends ActErrorResult {
      protected SourceInfo templateInfo;
  
      private String errorSpotTraceLine = null;
  
      public TemplateException(Exception t) {
          super(t);
      }
  
      public final SourceInfo templateSourceInfo() {
          return templateInfo;
      }
  
      public abstract String errorMessage();
  
      @Override
      public boolean isErrorSpot(String traceLine, String nextTraceLine) {
          if (null == errorSpotTraceLine) {
              errorSpotTraceLine = findErrorSpotTraceLine(stackTrace());
          }
          return S.eq(traceLine, errorSpotTraceLine);
      }
  
      @Override
      public synchronized Throwable getCause() {
          Throwable t0 = super.getCause();
          if (null == t0) {
              return null;
          }
          Throwable t = t0.getCause();
          return null == t ? t0 : t;
      }
  
      public Throwable getDirectCause() {
          return super.getCause();
      }
  
      protected String findErrorSpotTraceLine(List<String> stackTrace) {
          String spotLine = null, lastLine = null;
          for (String line: stackTrace) {
              if (line.contains("sun.reflect.NativeMethodAccessorImpl.invoke0")) {
                  spotLine = lastLine;
              }
              if (isTemplateEngineInvokeLine(line)) {
                  return spotLine;
              }
              lastLine = line;
          }
          return null;
      }
  
      protected static SourceInfo getJavaSourceInfo(Throwable cause) {
          if (null == cause) {
              return null;
          }
          cause = rootCauseOf(cause);
          DevModeClassLoader cl = (DevModeClassLoader) App.instance().classLoader();
          for (StackTraceElement stackTraceElement : cause.getStackTrace()) {
              int line = stackTraceElement.getLineNumber();
              if (line <= 0) {
                  continue;
              }
              Source source = cl.source(stackTraceElement.getClassName());
              if (null == source) {
                  continue;
              }
              return new SourceInfoImpl(source, line);
          }
          return null;
      }
  
      protected abstract boolean isTemplateEngineInvokeLine(String line);
  
  }
  