I guess I didn't look at it carefully, sorry. ^_^ You probably also want
to make a change to the last line (return new Boolean(left && right);) in
that block.
Xiping
David
Wood/Watson/i...@i
BMUS To
imperius-dev@incubator.apache.org
05/29/2009 10:14 cc
AM imperius-dev@incubator.apache.org
Subject
Re: svn commit: r779776 -
Please respond to in /incubator/imperius/trunk/imperi
imperius-...@incu us-splcore/src/main/java/org/apache
bator.apache.org /imperius/spl/parser/expressions/im
pl: LogicalAnd.java LogicalOr.java
The original code did this
boolean right = ((Boolean) _rhsExp.evaluate()).booleanValue();
Always! My change makes it so that it only does it if the left-hand side
evaluates to true (this is for the && case). what you suggest would work
as well.
David Wood
Policy Technologies Group
IBM TJ Watson Research Center
daw...@us.ibm.com
914-784-5123 (office), 914-396-6515 (mobile)
From:
Xiping Wang/Watson/i...@ibmus
To:
imperius-dev@incubator.apache.org
Date:
05/29/2009 09:12 AM
Subject:
Re: svn commit: r779776 - in
/incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl:
LogicalAnd.java LogicalOr.java
David,
I am not sure what the difference is between your changes and the original
code. I thought you wanted to optimize the code by simplifying evaluation
process as I described below. Am I missing something?
//for LogicalAnd
boolean left = ((Boolean) _lhsExp.evaluate()).booleanValue();
if (!left) return Boolean(false) //no further evaluation
//for LogicalOr
boolean left = ((Boolean) _lhsExp.evaluate()).booleanValue();
if (left) return Boolean(true) //no further evaluation
In addition, the left hand side or the right hand side can be a constant
expression, so a constant expression can always be eliminated when a
logical expression is created.
Xiping
daw...@apache.org
daw...@apache.org
05/28/2009 05:18 PM
Please respond to
imperius-dev@incubator.apache.org
To
imperius-comm...@incubator.apache.org
cc
Subject
svn commit: r779776 - in
/incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl:
LogicalAnd.java LogicalOr.java
Author: dawood
Date: Thu May 28 21:18:43 2009
New Revision: 779776
URL: http://svn.apache.org/viewvc?rev=779776&view=rev
Log:
implement short-circuited evaluation.
Modified:
incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl/LogicalAnd.java
incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl/LogicalOr.java
Modified:
incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl/LogicalAnd.java
URL:
http://svn.apache.org/viewvc/incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl/LogicalAnd.java?rev=779776&r1=779775&r2=779776&view=diff
==============================================================================
---
incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl/LogicalAnd.java
(original)
+++
incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl/LogicalAnd.java
Thu May 28 21:18:43 2009
@@ -76,7 +76,7 @@
try
{
boolean left = ((Boolean) _lhsExp.evaluate()).booleanValue();
- boolean right = ((Boolean)
_rhsExp.evaluate()).booleanValue();
+ boolean right = left && ((Boolean)
_rhsExp.evaluate()).booleanValue();
logger.exiting(sourceClass,Thread.currentThread().getName()+"
"+ "evaluate");
Modified:
incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl/LogicalOr.java
URL:
http://svn.apache.org/viewvc/incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl/LogicalOr.java?rev=779776&r1=779775&r2=779776&view=diff
==============================================================================
---
incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl/LogicalOr.java
(original)
+++
incubator/imperius/trunk/imperius-splcore/src/main/java/org/apache/imperius/spl/parser/expressions/impl/LogicalOr.java
Thu May 28 21:18:43 2009
@@ -79,7 +79,7 @@
{
//System.out.println("Logical OR::LHS type: RHS type ::"+
lhsExp.getType() + ":" + rhsExp.getType());
boolean left = ((Boolean) _lhsExp.evaluate()).booleanValue();
- boolean right = ((Boolean)
_rhsExp.evaluate()).booleanValue();
+ boolean right = left || ((Boolean)
_rhsExp.evaluate()).booleanValue();
//System.out.println("Logical OR::after Evaluation LHS: RHS
::"+ left + ":" + right);
logger.exiting(sourceClass,Thread.currentThread().getName()+"
"+ "evaluate");
