Add utility to concat exception message at runtime.

1 files changed, 34 insertions, 0 deletions

diff --git a/src/main/java/com/amazon/carbonado/gen/CodeBuilderUtil.java b/src/main/java/com/amazon/carbonado/gen/CodeBuilderUtil.java
index f25d6f1..7fad91f 100644
--- a/src/main/java/com/amazon/carbonado/gen/CodeBuilderUtil.java
+++ b/src/main/java/com/amazon/carbonado/gen/CodeBuilderUtil.java
@@ -100,6 +100,40 @@ public class CodeBuilderUtil {
     }

 

     /**

+     * Generate code to throw an exception with a message concatenated at runtime.

+     *

+     * @param b {@link CodeBuilder} to which to add code

+     * @param type type of the object to throw

+     * @param messages messages to concat at runtime

+     */

+    public static void throwConcatException(CodeBuilder b, Class type, String... messages) {

+        if (messages == null || messages.length == 0) {

+            throwException(b, type, null);

+            return;

+        }

+        if (messages.length == 1) {

+            throwException(b, type, messages[0]);

+            return;

+        }

+

+        TypeDesc desc = TypeDesc.forClass(type);

+        b.newObject(desc);

+        b.dup();

+

+        TypeDesc[] params = new TypeDesc[] {TypeDesc.STRING};

+

+        for (int i=0; i<messages.length; i++) {

+            b.loadConstant(String.valueOf(messages[i]));

+            if (i > 0) {

+                b.invokeVirtual(TypeDesc.STRING, "concat", TypeDesc.STRING, params);

+            }

+        }

+

+        b.invokeConstructor(desc, params);

+        b.throwObject();

+    }

+

+    /**

      * Collect a set of all the interfaces and recursively all superclasses for the leaf

      * (genericised class) and root (genericised base class).  Eg, for Object<foo>, all

      * classes and implemented interfaces for every superclass between foo (the leaf) and