Rename CMS EE4J

[lgpl/argeo-commons.git] / org.argeo.cms.ee / src / org / argeo / cms / integration / CmsExceptionsChain.java

diff --git a/org.argeo.cms.ee/src/org/argeo/cms/integration/CmsExceptionsChain.java b/org.argeo.cms.ee/src/org/argeo/cms/integration/CmsExceptionsChain.java
new file mode 100644 (file)
index 0000000..fb289c1
--- /dev/null
+++ b/org.argeo.cms.ee/src/org/argeo/cms/integration/CmsExceptionsChain.java
@@ -0,0 +1,154 @@
+package org.argeo.cms.integration;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.servlet.http.HttpServletResponse;
+
+import org.argeo.api.cms.CmsLog;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/** Serialisable wrapper of a {@link Throwable}. */
+public class CmsExceptionsChain {
+       public final static CmsLog log = CmsLog.getLog(CmsExceptionsChain.class);
+
+       private List<SystemException> exceptions = new ArrayList<>();
+
+       public CmsExceptionsChain() {
+               super();
+       }
+
+       public CmsExceptionsChain(Throwable exception) {
+               writeException(exception);
+               if (log.isDebugEnabled())
+                       log.error("Exception chain", exception);
+       }
+
+       public String toJsonString(ObjectMapper objectMapper) {
+               try {
+                       return objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(this);
+               } catch (JsonProcessingException e) {
+                       throw new IllegalStateException("Cannot write system exceptions " + toString(), e);
+               }
+       }
+
+       public void writeAsJson(ObjectMapper objectMapper, Writer writer) {
+               try {
+                       JsonGenerator jg = objectMapper.writerWithDefaultPrettyPrinter().getFactory().createGenerator(writer);
+                       jg.writeObject(this);
+               } catch (IOException e) {
+                       throw new IllegalStateException("Cannot write system exceptions " + toString(), e);
+               }
+       }
+
+       public void writeAsJson(ObjectMapper objectMapper, HttpServletResponse resp) {
+               try {
+                       resp.setContentType("application/json");
+                       resp.setStatus(500);
+                       writeAsJson(objectMapper, resp.getWriter());
+               } catch (IOException e) {
+                       throw new IllegalStateException("Cannot write system exceptions " + toString(), e);
+               }
+       }
+
+       /** recursive */
+       protected void writeException(Throwable exception) {
+               SystemException systemException = new SystemException(exception);
+               exceptions.add(systemException);
+               Throwable cause = exception.getCause();
+               if (cause != null)
+                       writeException(cause);
+       }
+
+       public List<SystemException> getExceptions() {
+               return exceptions;
+       }
+
+       public void setExceptions(List<SystemException> exceptions) {
+               this.exceptions = exceptions;
+       }
+
+       /** An exception in the chain. */
+       public static class SystemException {
+               private String type;
+               private String message;
+               private List<String> stackTrace;
+
+               public SystemException() {
+               }
+
+               public SystemException(Throwable exception) {
+                       this.type = exception.getClass().getName();
+                       this.message = exception.getMessage();
+                       this.stackTrace = new ArrayList<>();
+                       StackTraceElement[] elems = exception.getStackTrace();
+                       for (int i = 0; i < elems.length; i++)
+                               stackTrace.add("at " + elems[i].toString());
+               }
+
+               public String getType() {
+                       return type;
+               }
+
+               public void setType(String type) {
+                       this.type = type;
+               }
+
+               public String getMessage() {
+                       return message;
+               }
+
+               public void setMessage(String message) {
+                       this.message = message;
+               }
+
+               public List<String> getStackTrace() {
+                       return stackTrace;
+               }
+
+               public void setStackTrace(List<String> stackTrace) {
+                       this.stackTrace = stackTrace;
+               }
+
+               @Override
+               public String toString() {
+                       return "System exception: " + type + ", " + message + ", " + stackTrace;
+               }
+
+       }
+
+       @Override
+       public String toString() {
+               return exceptions.toString();
+       }
+
+//     public static void main(String[] args) throws Exception {
+//             try {
+//                     try {
+//                             try {
+//                                     testDeeper();
+//                             } catch (Exception e) {
+//                                     throw new Exception("Less deep exception", e);
+//                             }
+//                     } catch (Exception e) {
+//                             throw new RuntimeException("Top exception", e);
+//                     }
+//             } catch (Exception e) {
+//                     CmsExceptionsChain vjeSystemErrors = new CmsExceptionsChain(e);
+//                     ObjectMapper objectMapper = new ObjectMapper();
+//                     System.out.println(objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(vjeSystemErrors));
+//                     System.out.println(objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(e));
+//                     e.printStackTrace();
+//             }
+//     }
+//
+//     static void testDeeper() throws Exception {
+//             throw new IllegalStateException("Deep exception");
+//     }
+
+}