Now provides string formula, reads simple formulas, mmmm formulas

PR:
Obtained from:
Submitted by:
Reviewed by:


git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@352511 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/record/FormulaRecord.java

@@ -157,7 +157,7 @@ public class FormulaRecord
                                             int offset)
     {
         Stack stack = new Stack();
-        /*int   pos   = 22 + offset;
+        int   pos   = 22 + offset;
 
         while (pos < size)
         {
@@ -165,7 +165,7 @@ public class FormulaRecord
 
             pos += ptg.getSize();
             stack.push(ptg);
-        }*/
+        }
         return stack;
     }
 

src/java/org/apache/poi/hssf/record/formula/FormulaParser.java

@@ -391,6 +391,18 @@ end;
        }
     }
   
+    /**
+     * Convience method which takes in a list then passes it to the other toFormulaString
+     * signature
+     */
+    public static String toFormulaString(List lptgs) {
+        String retval = null;
+        Ptg[] ptgs = new Ptg[lptgs.size()];
+        ptgs = (Ptg[])lptgs.toArray(ptgs);
+        retval = toFormulaString(ptgs);
+        return retval;
+    }
+    
     /** Static method to convert an array of Ptgs in RPN order 
      *  to a human readable string format in infix mode
      *  TODO - extra brackets might appear, but string will be semantically correct. 

src/java/org/apache/poi/hssf/usermodel/HSSFCell.java

@@ -712,6 +712,15 @@ public class HSSFCell
         }
     }
     
+    public String getCellFormula() {
+        String retval=null;
+        
+        retval = 
+              FormulaParser.toFormulaString(((FormulaRecord)record).getParsedExpression());
+        
+        return retval;   
+    }
+    
     
     /**
      * get the value of the cell as a number.  For strings we throw an exception.