How to use Java code to create custom EncodedValue and use

[MaLou779]

I now have a HashMap, the key is an object of edgeId, nodeId, and the value is the number of vehicles. When the route arrives, the more vehicles, the higher the weight：

for (EdgeParameter key : edgeParameters) {
//创建一个 EncodeValue
BooleanEncodedValue bool = new SimpleBooleanEncodedValue(“congestion_” + key.getAdjEdge(), false);
bool.init(config);

        BaseGraph baseGraph = hopper.getBaseGraph();
        EdgeIteratorState edgeIteratorState = baseGraph.getEdgeIteratorState(key.getAdjEdge(), key.getAdjNode());
        edgeIteratorState.set(bool, true);
    }

    CustomModel customModel = new CustomModel();
    for (EdgeParameter key : edgeParameters) {
        Integer number = carNumber.get(key);
        Double X = Double.valueOf(number)  / 10;
        Double Y = 1 - X;
        customModel.addToPriority(
                Statement.If("congestion_" + key.getAdjEdge(), Statement.Op.MULTIPLY, Y + "")
        );
    }

But I can’t route out the route

[easbar]

It is very hard to tell what you are trying to achieve, but you can use this PR as a blueprint to understand how custom encoded values can be added:

Add footway encoded value

[MaLou779]

Thank you very much for the official reply. I am a beginner programmer from China, and my English proficiency is poor, so I have to use translation software to communicate with you. This may cause inconvenience to your reading, and I apologize. Now let me describe the function I want to achieve: avoiding congested road sections, assuming 0-5 vehicles’ priority: multiple '_ By: 0.9 ‘, 6-10 vehicles’ priority: multiple_ By: 0.5 and so on. Because there will be different vehicles on each side at different times, I would like to customize the 'EncodedValue' and set it to the corresponding side, rather than the official ones such as' road '_ Class, road_ Environment..., My imagined ‘EncodedValue’: Assuming there is an edge edgeId=1, there are 5 cars, and the time is 2030_ 06_ 01_ 10: At 37:35, then I will attach the following ‘EncodedValue’ to the edge of edgeId=1: ‘Congestion_1=2030_06_001:10:37:35’. Therefore, the ‘CustomimModel’ during routing is:“

{

Priority:[{

If “:” confliction_1==2030_06_01_10:37:35 ",

Multiply_by: ‘0.9’

}]

}“

The above is my case, which has caused you trouble. I look forward to receiving your help. Thank you!

笔记

[MaLou779]

I integrated into the project through the Jar package, using GraphHopper-7.0 version and using Java code for development,

[easbar]

This sounds like you want to change the priority based on the congestion of the road, i.e. the number of vehicles on the road at a certain time. First thing you should note is that the GraphHopper routing graph (including the EncodedValues) is basically read-only after it is created during the initial import. I’m not sure if this fits your need when representing road congestion.

Anyway, I think you should try to use an IntEncodedValue to represent the number vehicles (or the level of congestion).

For example:

int bits = 8; // this will allow for 2^8=256 different congestion levels
boolean bothDirections = true; // this will allow setting different congestions for the two directions of each road
IntEncodedValueImpl congestionEnc = new IntEncodedValueImpl("congestion", bits, bothDirections);

which you could use like this in the custom model:

priority:
   - if: congestion < 5
     multiply_by: 0.9
   - else_if: congestion < 10
     multiply_by: 0.8
   - else: ''
     multiply_by: 0.7

[MaLou779]

这是我的Java代码，但是还是不能实现路由，getBast(),is []

[MaLou779]

This is my Java code, but it still cannot implement routing, ‘getBast()’, is’ []`

[MaLou779]

the config is this：
EncodedValue.InitializerConfig config = new EncodedValue.InitializerConfig();

[easbar]

You can check for errors using res.getErrors().
Also you need add the congestion EncodedValue to the EncodingManager before you create the graph.

[MaLou779]

before create the graph? Is it before GraphHopper. importOrLoad()?

And, ‘GraphHopper. getEncodingManager()’, I cannot find the ‘create/set’ method in this’ EncodingManager ‘object. It only has’ get’, and I cannot add the created IntEncodedValue to the ‘EncodingManager’`

[easbar]

Yes, before importOrLoad(). Add your EncodedValue to DefaultEncodedValueFactory like in the PR I linked above. Then you can activate it like this: hopper.setEncodedValuesString("congestion").