[birt-dev] CheckIn: Add utility method for expression parser

["Mingxia Wu" <mwu@xxxxxxxxxxx>]

Title: CheckIn: Add utility method for _expression_ parser

- Summary:
Add utility method for expression parser

- Bugzilla Bug (s) Resolved:
None

- Description:
To support model’s work, add this utility method which could return the outer level of any column expression.

- Tests Description:
Unit test

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:  

- Notes to Documentation:  

- Files Edited:
\org.eclipse.birt.core\src\org\eclipse\birt\core\data\ExpressionParserUtility.java
\org.eclipse.birt.core\src\org\eclipse\birt\core\data\ExpressionUtil.java
\org.eclipse.birt.core\src\org\eclipse\birt\core\data\IColumnBinding.java
\org.eclipse.birt.core\test\org\eclipse\birt\core\data\ExpressionParserUtilityTest.java

- Files Added:

- Files Deleted