# HG changeset patch
# User Jaroslav Tulach <jaroslav.tulach@oracle.com>
# Date 1450265477 -3600
# Node ID fbe1eb7b4172d4ac7fb1f315b78e34ffab458da1
# Parent  9bba3a7b34beb2eb1c39f1b53ca4c072ee5b94ea
Providing compatible implementation of List.toString

diff -r 9bba3a7b34be -r fbe1eb7b4172 truffle/com.oracle.truffle.api.interop/src/com/oracle/truffle/api/interop/impl/ReadOnlyArrayList.java
--- a/truffle/com.oracle.truffle.api.interop/src/com/oracle/truffle/api/interop/impl/ReadOnlyArrayList.java	Mon Dec 14 15:07:19 2015 +0100
+++ b/truffle/com.oracle.truffle.api.interop/src/com/oracle/truffle/api/interop/impl/ReadOnlyArrayList.java	Wed Dec 16 12:31:17 2015 +0100
@@ -211,6 +211,25 @@
         return new ReadOnlyArrayList<>(arr, first + fromIndex, first + toIndex);
     }
 
+    @Override
+    public String toString() {
+        Iterator<T> it = iterator();
+        if (!it.hasNext()) {
+            return "[]";
+        }
+
+        StringBuilder sb = new StringBuilder();
+        sb.append('[');
+        for (;;) {
+            T e = it.next();
+            sb.append(e == this ? "(this Collection)" : e);
+            if (!it.hasNext()) {
+                return sb.append(']').toString();
+            }
+            sb.append(',').append(' ');
+        }
+    }
+
     private final class LI implements ListIterator<T>, Iterator<T> {
         private int index;
 
diff -r 9bba3a7b34be -r fbe1eb7b4172 truffle/com.oracle.truffle.api.test/src/com/oracle/truffle/api/interop/impl/ReadOnlyArrayListTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.api.test/src/com/oracle/truffle/api/interop/impl/ReadOnlyArrayListTest.java	Wed Dec 16 12:31:17 2015 +0100
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.api.interop.impl;
+
+import java.util.ArrayList;
+import java.util.List;
+import static org.junit.Assert.assertEquals;
+import org.junit.Test;
+
+public class ReadOnlyArrayListTest {
+    @Test
+    public void testToString() {
+        List<String> readOnly = ReadOnlyArrayList.asList(new String[]{"Hello", "from", "Truffle!"}, 0, 3);
+        List<String> copy = new ArrayList<>(readOnly);
+
+        assertEquals("Same toString result", readOnly.toString(), copy.toString());
+    }
+}