LUCENE-5987: don't double-wrap AbortingException

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1644072 13f79535-47bb-0310-9956-ffa450edef68

lucene/core/src/java/org/apache/lucene/index/AbortingException.java

@@ -21,7 +21,16 @@ package org.apache.lucene.index;
  *  lose previously indexed documents.  When this happens, the {@link IndexWriter} is forcefully 
  *  closed, using {@link IndexWriter#rollback}). */
 class AbortingException extends Exception {
-  AbortingException(Throwable cause) {
+  private AbortingException(Throwable cause) {
     super(cause);
+    assert cause instanceof AbortingException == false;
+  }
+
+  public static AbortingException wrap(Throwable t) {
+    if (t instanceof AbortingException) {
+      return (AbortingException) t;
+    } else {
+      return new AbortingException(t);
+    }
   }
 }

lucene/core/src/java/org/apache/lucene/index/DefaultIndexingChain.java

@@ -258,7 +258,7 @@ final class DefaultIndexingChain extends DocConsumer {
       initStoredFieldsWriter();
       storedFieldsWriter.startDocument();
     } catch (Throwable th) {
-      throw new AbortingException(th);
+      throw AbortingException.wrap(th);
     }
     lastStoredDocID++;
   }
@@ -269,7 +269,7 @@ final class DefaultIndexingChain extends DocConsumer {
     try {
       storedFieldsWriter.finishDocument();
     } catch (Throwable th) {
-      throw new AbortingException(th);
+      throw AbortingException.wrap(th);
     }
   }
 
@@ -322,7 +322,7 @@ final class DefaultIndexingChain extends DocConsumer {
     } catch (Throwable th) {
       // Must abort, on the possibility that on-disk term
       // vectors are now corrupt:
-      throw new AbortingException(th);
+      throw AbortingException.wrap(th);
     }
 
     // Add stored fields:
@@ -344,7 +344,7 @@ final class DefaultIndexingChain extends DocConsumer {
             storedFieldsWriter.writeField(fp.fieldInfo, field);
           } catch (Throwable th) {
             abort = true;
-            throw new AbortingException(th);
+            throw AbortingException.wrap(th);
           }
         }
 
@@ -655,7 +655,7 @@ final class DefaultIndexingChain extends DocConsumer {
             // Document will be deleted above:
             throw new IllegalArgumentException(msg, e);
           } catch (Throwable th) {
-            throw new AbortingException(th);
+            throw AbortingException.wrap(th);
           }
         }
 

lucene/core/src/java/org/apache/lucene/index/DocumentsWriterPerThread.java

@@ -456,7 +456,7 @@ class DocumentsWriterPerThread {
       return fs;
     } catch (Throwable th) {
       abort();
-      throw new AbortingException(th);
+      throw AbortingException.wrap(th);
     }
   }