7:46 a.m.
Hi,
sorry for the newbi question, i'm just starting to find my way in Drools.
i want to write a rule that filters URLs with a certain suffix (e.g. jpg,
gif, css, etc...).
i read about global vars and other variables and i'm not sure what to do.
i need to create a List with all the suffixes i want to filter, should i
create it inside FileType?
can you help?
Eyal.
-------------------------------------------
here's why i had so far:
the .drl file:
*package com.test.drools*
* *
*import com.test.drools.Facts.FileType;*
*
*
* *
*rule "Filter File Types"*
* *
* **when*
* $fileTypes : ??? *
* **FileType( type memberOf $fileTypes )*
* **then*
* **System.out.println("ALLOW");*
*end*
here's FileType:
package com.commtouch.drools;
import java.net.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Facts {
// return a file type of a url
public static class FileType {
private String type = "html";
public FileType (URL url) {
// get the path from the url
//TODO: use parser to do it?
String path = url.getPath();
if (path != null) {
// define regex to extract file from path
Pattern fileRegex = Pattern.compile("([^/]+)$");
Matcher fileMatcher = fileRegex.matcher(path);
// get regex capure $1 (filename)
String file = null;
while (fileMatcher.find())
file = fileMatcher.group(1);
String suffix = null;
if (file != null)
{
//try to extract suffix from file
Pattern suffixRegex = Pattern.compile("\\.([^\\.]+)$");
Matcher suffixMatcher = suffixRegex.matcher(file);
while (suffixMatcher.find())
suffix = suffixMatcher.group(1);
//verify that the suffix is a valid suffix
if (suffix != null && (suffix.length()> 1 && suffix.length() < 6))
setType(suffix);
}
}
}
public void setType(String type) {
this.type = type;
}
public String getType() {
return type;
}
}
}
--
Eyal Edri
5:10 p.m.
Maybe you can define a global List so you would not need to add it as a
Fact:
*package com.test.drools*
* *
*import com.test.drools.Facts.FileType;*
*
*
*global java.util.List allowedExtensions;*
* *
*rule "Filter File Types"*
* *
* **when** *
* **FileType( type memberOf allowedExtensions )*
* **then*
* **System.out.println("ALLOW");*
*end*
You will need to set the global list before inserting any Fact:
ksession.setGlobal("allowedExtensions",somePrePopulatedList);
Best,
2010/5/9 eyal edri <eyal.edri(a)gmail.com>
Hi,
sorry for the newbi question, i'm just starting to find my way in Drools.
i want to write a rule that filters URLs with a certain suffix (e.g. jpg,
gif, css, etc...).
i read about global vars and other variables and i'm not sure what to do.
i need to create a List with all the suffixes i want to filter, should i
create it inside FileType?
can you help?
Eyal.
-------------------------------------------
here's why i had so far:
the .drl file:
*package com.test.drools*
* *
*import com.test.drools.Facts.FileType;*
*
*
* *
*rule "Filter File Types"*
* *
* **when*
* $fileTypes : ??? *
* **FileType( type memberOf $fileTypes )*
* **then*
* **System.out.println("ALLOW");*
*end*
here's FileType:
package com.commtouch.drools;
import java.net.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Facts {
// return a file type of a url
public static class FileType {
private String type = "html";
public FileType (URL url) {
// get the path from the url
//TODO: use parser to do it?
String path = url.getPath();
if (path != null) {
// define regex to extract file from path
Pattern fileRegex = Pattern.compile("([^/]+)$");
Matcher fileMatcher = fileRegex.matcher(path);
// get regex capure $1 (filename)
String file = null;
while (fileMatcher.find())
file = fileMatcher.group(1);
String suffix = null;
if (file != null)
{
//try to extract suffix from file
Pattern suffixRegex = Pattern.compile("\\.([^\\.]+)$");
Matcher suffixMatcher = suffixRegex.matcher(file);
while (suffixMatcher.find())
suffix = suffixMatcher.group(1);
//verify that the suffix is a valid suffix
if (suffix != null && (suffix.length()> 1 && suffix.length() <
6))
setType(suffix);
}
}
}
public void setType(String type) {
this.type = type;
}
public String getType() {
return type;
}
}
}
--
Eyal Edri
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
2:25 a.m.
Thanks!
I've found another way by using 'matches'. though i don't know which one
is preferable (performance speaking..).
rule "Filter File Types"
salience 100 // priority
when
FileType( type matches "(ico|gif|jpg|mov|wmv|jpeg|css|bmp|avi|swf|png)" )
then
//TODO: change to actual action
System.out.println("ALLOW");
end
2010/5/10 Esteban Aliverti <esteban.aliverti(a)gmail.com>
Maybe you can define a global List so you would not need to add it as
a
Fact:
*package com.test.drools*
* *
*import com.test.drools.Facts.FileType;*
*
*
*global java.util.List allowedExtensions;*
* *
*rule "Filter File Types"*
* *
* **when** *
* **FileType( type memberOf allowedExtensions )*
* **then*
* **System.out.println("ALLOW");*
*end*
You will need to set the global list before inserting any Fact:
ksession.setGlobal("allowedExtensions",somePrePopulatedList);
Best,
2010/5/9 eyal edri <eyal.edri(a)gmail.com>
> Hi,
>
> sorry for the newbi question, i'm just starting to find my way in Drools.
>
> i want to write a rule that filters URLs with a certain suffix (e.g. jpg,
> gif, css, etc...).
>
> i read about global vars and other variables and i'm not sure what to do.
>
> i need to create a List with all the suffixes i want to filter, should i
> create it inside FileType?
>
> can you help?
>
> Eyal.
> -------------------------------------------
>
> here's why i had so far:
>
>
> the .drl file:
>
> *package com.test.drools*
> * *
> *import com.test.drools.Facts.FileType;*
> *
> *
> * *
> *rule "Filter File Types"*
> * *
> * **when*
> * $fileTypes : ??? *
> * **FileType( type memberOf $fileTypes )*
> * **then*
> * **System.out.println("ALLOW");*
> *end*
>
> here's FileType:
>
> package com.commtouch.drools;
>
> import java.net.*;
> import java.util.regex.Matcher;
> import java.util.regex.Pattern;
>
> public class Facts {
> // return a file type of a url
> public static class FileType {
>
> private String type = "html";
>
> public FileType (URL url) {
> // get the path from the url
> //TODO: use parser to do it?
> String path = url.getPath();
> if (path != null) {
> // define regex to extract file from path
> Pattern fileRegex = Pattern.compile("([^/]+)$");
> Matcher fileMatcher = fileRegex.matcher(path);
> // get regex capure $1 (filename)
> String file = null;
> while (fileMatcher.find())
> file = fileMatcher.group(1);
>
> String suffix = null;
> if (file != null)
> {
> //try to extract suffix from file
> Pattern suffixRegex = Pattern.compile("\\.([^\\.]+)$");
> Matcher suffixMatcher = suffixRegex.matcher(file);
> while (suffixMatcher.find())
> suffix = suffixMatcher.group(1);
> //verify that the suffix is a valid suffix
> if (suffix != null && (suffix.length()> 1 && suffix.length() <
6))
> setType(suffix);
> }
> }
> }
>
> public void setType(String type) {
> this.type = type;
> }
> public String getType() {
> return type;
> }
> }
> }
>
>
> --
> Eyal Edri
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
--
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
Eyal Edri
2:38 a.m.
You should add '^' and '$' to avoid matching with part of the type
String.
-W
2010/5/10 eyal edri <eyal.edri(a)gmail.com>
Thanks!
I've found another way by using 'matches'. though i don't know which one
is preferable (performance speaking..).
rule "Filter File Types"
salience 100 // priority
when
FileType( type matches "(ico|gif|jpg|mov|wmv|jpeg|css|bmp|avi|swf|png)" )
then
//TODO: change to actual action
System.out.println("ALLOW");
end
2010/5/10 Esteban Aliverti <esteban.aliverti(a)gmail.com>
> Maybe you can define a global List so you would not need to add it as a
> Fact:
>
>
> *package com.test.drools*
> * *
> *import com.test.drools.Facts.FileType;*
> *
> *
> *global java.util.List allowedExtensions;*
> * *
> *rule "Filter File Types"*
> * *
> * **when** *
> * **FileType( type memberOf allowedExtensions )*
> * **then*
> * **System.out.println("ALLOW");*
> *end*
>
> You will need to set the global list before inserting any Fact:
> ksession.setGlobal("allowedExtensions",somePrePopulatedList);
>
> Best,
>
>
> 2010/5/9 eyal edri <eyal.edri(a)gmail.com>
>
>> Hi,
>>
>> sorry for the newbi question, i'm just starting to find my way in Drools.
>>
>> i want to write a rule that filters URLs with a certain suffix (e.g.
>> jpg, gif, css, etc...).
>>
>> i read about global vars and other variables and i'm not sure what to do.
>>
>> i need to create a List with all the suffixes i want to filter, should i
>> create it inside FileType?
>>
>> can you help?
>>
>> Eyal.
>> -------------------------------------------
>>
>> here's why i had so far:
>>
>>
>> the .drl file:
>>
>> *package com.test.drools*
>> * *
>> *import com.test.drools.Facts.FileType;*
>> *
>> *
>> * *
>> *rule "Filter File Types"*
>> * *
>> * **when*
>> * $fileTypes : ??? *
>> * **FileType( type memberOf $fileTypes )*
>> * **then*
>> * **System.out.println("ALLOW");*
>> *end*
>>
>> here's FileType:
>>
>> package com.commtouch.drools;
>>
>> import java.net.*;
>> import java.util.regex.Matcher;
>> import java.util.regex.Pattern;
>>
>> public class Facts {
>> // return a file type of a url
>> public static class FileType {
>>
>> private String type = "html";
>>
>> public FileType (URL url) {
>> // get the path from the url
>> //TODO: use parser to do it?
>> String path = url.getPath();
>> if (path != null) {
>> // define regex to extract file from path
>> Pattern fileRegex = Pattern.compile("([^/]+)$");
>> Matcher fileMatcher = fileRegex.matcher(path);
>> // get regex capure $1 (filename)
>> String file = null;
>> while (fileMatcher.find())
>> file = fileMatcher.group(1);
>>
>> String suffix = null;
>> if (file != null)
>> {
>> //try to extract suffix from file
>> Pattern suffixRegex = Pattern.compile("\\.([^\\.]+)$");
>> Matcher suffixMatcher = suffixRegex.matcher(file);
>> while (suffixMatcher.find())
>> suffix = suffixMatcher.group(1);
>> //verify that the suffix is a valid suffix
>> if (suffix != null && (suffix.length()> 1 && suffix.length()
< 6))
>> setType(suffix);
>> }
>> }
>> }
>>
>> public void setType(String type) {
>> this.type = type;
>> }
>> public String getType() {
>> return type;
>> }
>> }
>> }
>>
>>
>> --
>> Eyal Edri
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
>
> --
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
--
Eyal Edri
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
9:37 a.m.
If you want to restrict to a series of literals you might check if the "in"
operator is faster:
rule "Filter File
Types"
salience 100 // priority when
FileType( type in
("ico","gif","jpg","mov","wmv","jpeg","css","bmp","avi","swf","png")
)
then //TODO: change to actual action
System.out.println("ALLOW");
end
I don't know if "in" is hashed behind the scenes, but if it is it probably
would be much faster, especially because I think mvel recompiles the regex behind the
scenes before each evaluation. (A dev please correct me if I'm wrong on that last
point.)
--- On Mon, 5/10/10, eyal edri <eyal.edri(a)gmail.com> wrote:
From: eyal edri <eyal.edri(a)gmail.com>
Subject: Re: [rules-users] how to create a list obj for a rule using 'memberOf'
To: "Rules Users List" <rules-users(a)lists.jboss.org>
Date: Monday, May 10, 2010, 2:25 AM
Thanks!
I've found another way by using 'matches'. though i don't know which one
is preferable (performance speaking..).
rule "Filter File Types"
salience 100 // priority when
FileType( type matches "(ico|gif|jpg|mov|wmv|jpeg|css|bmp|avi|swf|png)" )
then //TODO: change to actual action
System.out.println("ALLOW");
end
2010/5/10 Esteban Aliverti <esteban.aliverti(a)gmail.com>
Maybe you can define a global List so you would not need to add it as a Fact:
package com.test.drools
import com.test.drools.Facts.FileType;
global java.util.List allowedExtensions;
rule "Filter File Types"
when
FileType( type memberOf allowedExtensions )
then System.out.println("ALLOW");
end
You will need to set the global list before inserting any Fact:
ksession.setGlobal("allowedExtensions",somePrePopulatedList);
Best,
2010/5/9 eyal edri <eyal.edri(a)gmail.com>
Hi,
sorry for the newbi question, i'm just starting to find my way in Drools.
i want to write a rule that filters URLs with a certain suffix (e.g. jpg, gif, css,
etc...).
i read about global vars and other variables and i'm not sure what to do.
i need to create a List with all the suffixes i want to filter, should i create it inside
FileType?
can you help?
Eyal.-------------------------------------------
here's why i had so far:
the .drl file:
package com.test.drools import com.test.drools.Facts.FileType;
rule "Filter File Types"
when
$fileTypes : ??? FileType( type memberOf $fileTypes )
then System.out.println("ALLOW");
end
here's FileType:
package com.commtouch.drools;
import java.net.*;import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Facts {
// return a file type of a url
public static class FileType {
private String type = "html";
public FileType (URL url) {
// get the path from the url
//TODO: use parser to do it?
String path = url.getPath();
if (path != null) {
// define regex to extract file from path
Pattern fileRegex = Pattern.compile("([^/]+)$");
Matcher fileMatcher = fileRegex.matcher(path);
// get regex capure $1 (filename)
String file = null;
while (fileMatcher.find())
file = fileMatcher.group(1);
String suffix = null;
if (file != null)
{
//try to extract suffix from file
Pattern suffixRegex = Pattern.compile("\\.([^\\.]+)$");
Matcher suffixMatcher = suffixRegex.matcher(file);
while (suffixMatcher.find())
suffix = suffixMatcher.group(1);
//verify that the suffix is a valid suffix
if (suffix != null && (suffix.length()> 1 && suffix.length() <
6))
setType(suffix);
}
}
}
public void setType(String type) {
this.type = type;
}
public String getType() {
return type;
} }
}
--
Eyal Edri
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Esteban Aliverti
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
Eyal Edri
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participants (4)
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Esteban Aliverti -
eyal edri -
Greg Barton -
Wolfgang Laun