Fix for keeping lists structure

java/org/chromium/distiller/webdocument/WebTag.java

Index: java/org/chromium/distiller/webdocument/WebTag.java
diff --git a/java/org/chromium/distiller/webdocument/WebTag.java b/java/org/chromium/distiller/webdocument/WebTag.java
new file mode 100644
index 0000000000000000000000000000000000000000..ecf6e70c2d493a35e58f58bfb57ee72eb74860fd
--- /dev/null
+++ b/java/org/chromium/distiller/webdocument/WebTag.java
@@ -0,0 +1,50 @@
+package org.chromium.distiller.webdocument;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * This class represents HTML tags that need to be preserved over
+ * the distillation process.
+ */
+public class WebTag extends WebElement {
+    private String tagName;
+    private TagType tagType;
+
+    public enum TagType {
+        START, END
+    }
+
+    private static Set<String> nestingTags;
+    static {
+        nestingTags = new HashSet<String>();
+        nestingTags.add("UL");
+        nestingTags.add("OL");
+        nestingTags.add("LI");
+    }
+
+    public WebTag(String tagName, TagType tagType) {
+        this.tagName = tagName;
+        this.tagType = tagType;
+    }
+
+    public boolean isStartTag() {
+        return tagType == TagType.START;
+    }
+
+    public String getTagName() {
+        return tagName;
+    }
+
+    @Override
+    public String generateOutput(boolean textOnly) {
+        if (textOnly) {
+            return "";
+        }
+        return "<" + (isStartTag() ? "" : "/") + tagName + ">";
+    }
+
+    public static boolean canBeNested(String tagName) {
+        return nestingTags.contains(tagName);
+    }
+}