Merge origin/master

Author: wumpz

README.md

@@ -47,6 +47,7 @@ Also I would like to know about needed examples or documentation stuff.
 
 ## Extensions in the latest SNAPSHOT version 1.1
 
+* common normal form transformer for expressions (https://en.wikipedia.org/wiki/Conjunctive_normal_form) 
 * checkstyle integration to force first souce code conventions
   * checkstyle is activated by default, it can be deactivated by an environment property **skipCheckSources**
   * pull requests should follow this style settings

src/main/java/net/sf/jsqlparser/expression/BinaryExpression.java

@@ -30,7 +30,9 @@ public abstract class BinaryExpression implements Expression {
     private Expression leftExpression;
     private Expression rightExpression;
     private boolean not = false;
-
+    
+    
+    
     public BinaryExpression() {
     }
 
@@ -53,7 +55,11 @@ public void setRightExpression(Expression expression) {
     public void setNot() {
         not = true;
     }
-
+    
+    public void removeNot() {
+        not = false;
+    }
+ 
     public boolean isNot() {
         return not;
     }
@@ -64,4 +70,5 @@ public String toString() {
     }
 
     public abstract String getStringExpression();
+    
 }