diff -r 6c718c5086b3 -r 0fa6f84c1195 langtools/test/tools/javac/classfiles/attributes/LineNumberTable/Container.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/classfiles/attributes/LineNumberTable/Container.java	Thu Oct 16 14:31:37 2014 -0700
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2014, 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.
+ */
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.stream.IntStream;
+
+import static java.util.stream.Collectors.toList;
+
+/**
+ * Source code template container. Contains methods for inserting one template inside another one and for generating
+ * final sources replacing placeholder by language construction.
+ */
+public class Container {
+
+    private static final String TEMPLATE_LEVEL = "#LEVEL";
+    private static final String SUB_TEMPLATE = "#SUB_TEMPLATE";
+
+    private String template;
+    private int level;
+
+    Container(String template) {
+        this.template = template;
+    }
+
+    public String getTemplate() {
+        return template;
+    }
+
+    public Container insert(Container container) {
+        template = template.replace(SUB_TEMPLATE, container.getTemplate());
+        template = template.replaceAll(TEMPLATE_LEVEL, String.valueOf(level++));
+        return this;
+    }
+
+    public List<TestCase> generate(Construction... constructions) throws IOException {
+        List<TestCase> testCases = new ArrayList<>();
+        String template = getTemplate();
+
+        int lineNumberOffset = template.substring(0, template.indexOf(SUB_TEMPLATE)).split("\n").length - 1;
+        for (Construction c : constructions) {
+            String src = template.replace(SUB_TEMPLATE, c.getSource());
+            Collection<Integer> significantLines = IntStream.of(c.getExpectedLines())
+                    .mapToObj(line -> lineNumberOffset + line)
+                    .collect(toList());
+            testCases.add(new TestCase(src, significantLines, c.name()));
+        }
+        return testCases;
+    }
+
+    public interface Construction {
+        String getSource();
+
+        int[] getExpectedLines();
+
+        String name();
+    }
+}