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Using filters to filter a variable value with GeoTools

What is the most efficient way to create a shapefile from resultset using geotoolsUsing Linestring distance in meters with GeoTools?GeoTools FeatureCollection to Filter (make Filter from a FeatureCollection)Creating a raster file from a shapefile using GeoTools with different colours for different featuresStyling features based on a custom rule using GeoToolsHow to calculate whether a point is in a shape using geodetic calculationsgeotools filter CQLException: Encountered “t”Cropping GeoTIFF with GeoTools using integer indexesComparing crses with geotoolsGeotools CQL to OGC filter

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
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2

I have a Java Swing application which loads a line shapefile and draws a map. I'm using a filter and a rule to filter out the lines in the shapefile where the attribute "traffic" is greater than 500. Each line has a different "traffic" value and this works perfectly ("traffic" means the maximum allowable traffic volume of the road). I can make a separate style for this filtered lines.

    Rule rule = sb.createRule(textSymbolizer);

    rule.setFilter(sb.getFilterFactory().greater(

            sb.getFilterFactory().property("traffic"), 

            sb.getFilterFactory().literal(500.0)));

    FeatureTypeStyle fts = sb.createFeatureTypeStyle("Feature",rule);

Now I want to do the following logic

if("traffic" property value > current_traffic_value){

    // style this line uniquely

}

The "current_traffic_value" is a integer value stored in a database for each line. So I want to check each line against a variable value. Can I achieve this using SLD methods? What would be the optimum method to achieve this?

features geotools

share|improve this question

edited Apr 14 '18 at 19:14

nmtoken

8,15542866

asked Apr 16 '16 at 17:39

tybandaratybandara

1378

bumped to the homepage by Community♦ 2 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I just found a quick method to accomplish this by using 'EnvFunction'. I first set a unique value 'EnvFunction.setGlobalValue(unique_str, variable_value);'. Then, I'd create a function as ' Function fn = ff.function("env", ff.property(unique_str), ff.literal(0));'. This fn can be easily used in 'rule.setfilter()'. I'm sure there are much better and clean ways to achieve this. The drawback here is that I have to set global value for each line.
  
  – tybandara
  Apr 16 '16 at 18:57
  
  
  

  
  
  
  

add a comment | 

2

I have a Java Swing application which loads a line shapefile and draws a map. I'm using a filter and a rule to filter out the lines in the shapefile where the attribute "traffic" is greater than 500. Each line has a different "traffic" value and this works perfectly ("traffic" means the maximum allowable traffic volume of the road). I can make a separate style for this filtered lines.

    Rule rule = sb.createRule(textSymbolizer);

    rule.setFilter(sb.getFilterFactory().greater(

            sb.getFilterFactory().property("traffic"), 

            sb.getFilterFactory().literal(500.0)));

    FeatureTypeStyle fts = sb.createFeatureTypeStyle("Feature",rule);

Now I want to do the following logic

if("traffic" property value > current_traffic_value){

    // style this line uniquely

}

The "current_traffic_value" is a integer value stored in a database for each line. So I want to check each line against a variable value. Can I achieve this using SLD methods? What would be the optimum method to achieve this?

features geotools

share|improve this question

edited Apr 14 '18 at 19:14

nmtoken

8,15542866

asked Apr 16 '16 at 17:39

tybandaratybandara

1378

bumped to the homepage by Community♦ 2 mins ago

This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I just found a quick method to accomplish this by using 'EnvFunction'. I first set a unique value 'EnvFunction.setGlobalValue(unique_str, variable_value);'. Then, I'd create a function as ' Function fn = ff.function("env", ff.property(unique_str), ff.literal(0));'. This fn can be easily used in 'rule.setfilter()'. I'm sure there are much better and clean ways to achieve this. The drawback here is that I have to set global value for each line.
  
  – tybandara
  Apr 16 '16 at 18:57
  
  
  

  
  
  
  

add a comment | 

I have a Java Swing application which loads a line shapefile and draws a map. I'm using a filter and a rule to filter out the lines in the shapefile where the attribute "traffic" is greater than 500. Each line has a different "traffic" value and this works perfectly ("traffic" means the maximum allowable traffic volume of the road). I can make a separate style for this filtered lines.

    Rule rule = sb.createRule(textSymbolizer);

    rule.setFilter(sb.getFilterFactory().greater(

            sb.getFilterFactory().property("traffic"), 

            sb.getFilterFactory().literal(500.0)));

    FeatureTypeStyle fts = sb.createFeatureTypeStyle("Feature",rule);

Now I want to do the following logic

if("traffic" property value > current_traffic_value){

    // style this line uniquely

}

The "current_traffic_value" is a integer value stored in a database for each line. So I want to check each line against a variable value. Can I achieve this using SLD methods? What would be the optimum method to achieve this?

features geotools

share|improve this question

edited Apr 14 '18 at 19:14

nmtoken

8,15542866

asked Apr 16 '16 at 17:39

tybandaratybandara

1378

    Rule rule = sb.createRule(textSymbolizer);

    rule.setFilter(sb.getFilterFactory().greater(

            sb.getFilterFactory().property("traffic"), 

            sb.getFilterFactory().literal(500.0)));

    FeatureTypeStyle fts = sb.createFeatureTypeStyle("Feature",rule);

if("traffic" property value > current_traffic_value){

    // style this line uniquely

}

share|improve this question

edited Apr 14 '18 at 19:14

nmtoken

8,15542866

asked Apr 16 '16 at 17:39

tybandaratybandara

1378

share|improve this question

edited Apr 14 '18 at 19:14

nmtoken

8,15542866

asked Apr 16 '16 at 17:39

tybandaratybandara

1378

edited Apr 14 '18 at 19:14

nmtoken

8,15542866

edited Apr 14 '18 at 19:14

nmtoken

8,15542866

asked Apr 16 '16 at 17:39

tybandaratybandara

1378

asked Apr 16 '16 at 17:39

tybandaratybandara

1378

1 Answer
1

active

oldest

votes

0

If I understand what you want then it should be a simple filter like:

Rule rule = sb.createRule(textSymbolizer);

rule.setFilter(sb.getFilterFactory().greater(

        sb.getFilterFactory().property("traffic"), 

        sb.getFilterFactory().property("current_trafic")));

FeatureTypeStyle fts = sb.createFeatureTypeStyle("Feature",rule);

share|improve this answer

answered Apr 18 '16 at 7:58

Ian Turton♦Ian Turton

50.5k548120

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm sorry if I wasn't clear enough. Actually this is slightly different to what I need. I would need to get the "traffic" property (shapefile attribute) and test it against a value "current_traffic" which is stored in a database. For example, there is a database where the current_traffic for each line is stored. And there is a "traffic" attribute in the shapefile attribute. I want to test these two values. Thanks in advance.
  
  – tybandara
  Apr 18 '16 at 8:54
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The best plan would be to put all the data in the database and create a view with the join.
  
  – Ian Turton♦
  Apr 18 '16 at 8:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Just for testing purposes I used 'EnvFunction'. For the next update I'd plan to put all data in a database. Then I believe I'd need to check and test both values and draw the line in the unique way manually on a line feature. Is that what you meant by "create a view with the join"?
  
  – tybandara
  Apr 18 '16 at 9:05
  

  
  
  
  

add a comment | 

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0

If I understand what you want then it should be a simple filter like:

Rule rule = sb.createRule(textSymbolizer);

rule.setFilter(sb.getFilterFactory().greater(

        sb.getFilterFactory().property("traffic"), 

        sb.getFilterFactory().property("current_trafic")));

FeatureTypeStyle fts = sb.createFeatureTypeStyle("Feature",rule);

share|improve this answer

answered Apr 18 '16 at 7:58

Ian Turton♦Ian Turton

50.5k548120

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm sorry if I wasn't clear enough. Actually this is slightly different to what I need. I would need to get the "traffic" property (shapefile attribute) and test it against a value "current_traffic" which is stored in a database. For example, there is a database where the current_traffic for each line is stored. And there is a "traffic" attribute in the shapefile attribute. I want to test these two values. Thanks in advance.
  
  – tybandara
  Apr 18 '16 at 8:54
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The best plan would be to put all the data in the database and create a view with the join.
  
  – Ian Turton♦
  Apr 18 '16 at 8:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Just for testing purposes I used 'EnvFunction'. For the next update I'd plan to put all data in a database. Then I believe I'd need to check and test both values and draw the line in the unique way manually on a line feature. Is that what you meant by "create a view with the join"?
  
  – tybandara
  Apr 18 '16 at 9:05
  

  
  
  
  

add a comment | 

0

If I understand what you want then it should be a simple filter like:

Rule rule = sb.createRule(textSymbolizer);

rule.setFilter(sb.getFilterFactory().greater(

        sb.getFilterFactory().property("traffic"), 

        sb.getFilterFactory().property("current_trafic")));

FeatureTypeStyle fts = sb.createFeatureTypeStyle("Feature",rule);

share|improve this answer

answered Apr 18 '16 at 7:58

Ian Turton♦Ian Turton

50.5k548120

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm sorry if I wasn't clear enough. Actually this is slightly different to what I need. I would need to get the "traffic" property (shapefile attribute) and test it against a value "current_traffic" which is stored in a database. For example, there is a database where the current_traffic for each line is stored. And there is a "traffic" attribute in the shapefile attribute. I want to test these two values. Thanks in advance.
  
  – tybandara
  Apr 18 '16 at 8:54
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The best plan would be to put all the data in the database and create a view with the join.
  
  – Ian Turton♦
  Apr 18 '16 at 8:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Just for testing purposes I used 'EnvFunction'. For the next update I'd plan to put all data in a database. Then I believe I'd need to check and test both values and draw the line in the unique way manually on a line feature. Is that what you meant by "create a view with the join"?
  
  – tybandara
  Apr 18 '16 at 9:05
  

  
  
  
  

add a comment | 

If I understand what you want then it should be a simple filter like:

Rule rule = sb.createRule(textSymbolizer);

rule.setFilter(sb.getFilterFactory().greater(

        sb.getFilterFactory().property("traffic"), 

        sb.getFilterFactory().property("current_trafic")));

FeatureTypeStyle fts = sb.createFeatureTypeStyle("Feature",rule);

share|improve this answer

answered Apr 18 '16 at 7:58

Ian Turton♦Ian Turton

50.5k548120

Rule rule = sb.createRule(textSymbolizer);

rule.setFilter(sb.getFilterFactory().greater(

        sb.getFilterFactory().property("traffic"), 

        sb.getFilterFactory().property("current_trafic")));

FeatureTypeStyle fts = sb.createFeatureTypeStyle("Feature",rule);

share|improve this answer

answered Apr 18 '16 at 7:58

Ian Turton♦Ian Turton

50.5k548120

answered Apr 18 '16 at 7:58

Ian Turton♦Ian Turton

50.5k548120

answered Apr 18 '16 at 7:58

Ian Turton♦Ian Turton

50.5k548120