GROOVY-7853: o.c.g.r.t.DefaultTypeTransformation does not apply the r…

…ight toString on primitve arrays when transforming to String

src/main/org/codehaus/groovy/runtime/typehandling/ShortTypeHandling.java

@@ -20,6 +20,8 @@
 
 import groovy.lang.GString;
 
+import java.util.Arrays;
+
 /**
  * Class providing various short paths for type conversions. Read the comments
  * to what conditions have to be met to get valid results!
@@ -41,7 +43,15 @@ public static Class castToClass(Object object) {
 
     public static String castToString(Object object) {
         if (object==null) return null;
-        if (object instanceof Class) return (String) object;
+        if (object instanceof boolean[]) return Arrays.toString((boolean[])object);
+        if (object instanceof byte[]) return Arrays.toString((byte[])object);
+        if (object instanceof char[]) return new String((char[])object);
+        if (object instanceof double[]) return Arrays.toString((double[])object);
+        if (object instanceof float[]) return Arrays.toString((float[])object);
+        if (object instanceof int[]) return Arrays.toString((int[])object);
+        if (object instanceof long[]) return Arrays.toString((long[])object);
+        if (object instanceof short[]) return Arrays.toString((short[])object);
+        if (object instanceof Object[]) return Arrays.toString((Object[])object);
         return object.toString();
     }
 

src/test/org/codehaus/groovy/classgen/CastToStringTest.groovy

@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ *
+ */
+package org.codehaus.groovy.classgen
+
+class CastToStringTest extends GroovyShellTestCase {
+    void testNormalAndPrimitiveArrayHandling_Groovy7853() {
+        assertScript '''
+            byte[] bytes = "hello".bytes
+            char[] chars = "hello".chars
+            boolean[] flags = [true, false]
+            long[] nums = [34L, 45L]
+            String[] pets = ['cat', 'dog']
+
+            String convert(byte[] data) { data }
+            String convert(char[] data) { data }
+            String convert(boolean[] data) { data }
+            String convert(long[] data) { data }
+            String convert(String[] data) { data }
+
+            assert bytes.toString() == convert(bytes)
+            assert chars.toString() == convert(chars)
+            assert flags.toString() == convert(flags)
+            assert nums.toString() == convert(nums)
+            assert pets.toString() == convert(pets)
+        '''
+    }
+}