Refactor WebDav implementation

[lgpl/argeo-commons.git] / org.argeo.util / src / org / argeo / util / ExceptionsChain.java

diff --git a/org.argeo.util/src/org/argeo/util/ExceptionsChain.java b/org.argeo.util/src/org/argeo/util/ExceptionsChain.java
new file mode 100644 (file)
index 0000000..9f82421
--- /dev/null
+++ b/org.argeo.util/src/org/argeo/util/ExceptionsChain.java
@@ -0,0 +1,90 @@
+package org.argeo.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Serialisable wrapper of a {@link Throwable}. typically to be written as XML
+ * or JSON in a server error response.
+ */
+public class ExceptionsChain {
+       private List<SystemException> exceptions = new ArrayList<>();
+
+       public ExceptionsChain() {
+       }
+
+       public ExceptionsChain(Throwable exception) {
+               writeException(exception);
+       }
+
+       /** 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();
+       }
+}