How to work with the snap environment

public void snapEnvirSettings(IEngineEditor editor)throws Exception{

    //Get the snap environment from the editor.
    IEngineSnapEnvironment snapEnvironment = (IEngineSnapEnvironment)editor;

    //Make sure there is a snap agent turned on in the snap environment. 
    if (snapEnvironment.getSnapAgentCount() == 0){
        System.out.println("You need to turnon at least one snapping agent!!!");
        return ;
    }

    //Code to display the snap tolerance in a message box.
    double tolerance = snapEnvironment.getSnapTolerance();
    System.out.println("Tolerance: " + tolerance);

    //To set the snap tolerance.
    snapEnvironment.setSnapToleranceUnits
        (esriEngineSnapToleranceUnits.esriEngineSnapToleranceMapUnits);
    snapEnvironment.setSnapTolerance(15);

    //To turn snap tips on.
    ((IEngineEditProperties2)editor).setSnapTips(true);
}

private boolean checkIsAnySnapAgentSelected(IEngineSnapEnvironment snapEnvironment){
    int snapAgentCount = snapEnvironment.getSnapAgentCount();
    int checkedFeatureSnapAgentCount = 0;
    int featureSnapAgentCount = 0;

    //Loop through all registered snap agents in the snap environment. 
    //Count feature snap agents, 
    //check feature snap agents and nonfeature snap agents. 

    for (int i = 0; i < snapAgentCount; i++){
        IEngineSnapAgent currentSnapAgent = snapEnvironment.getSnapAgent(i);
        if (currentSnapAgent instanceof IEngineFeatureSnapAgent){
            IEngineFeatureSnapAgent featureSnapAgent = (IEngineFeatureSnapAgent)
                currentSnapAgent;
            featureSnapAgentCount++;

            //Determine if the feature snap agent is checked. 
            if (featureSnapAgent.getHitType() !=
                esriGeometryHitPartType.esriGeometryPartNone){
                checkedFeatureSnapAgentCount++;
            }
        }
    }
    if ((checkedFeatureSnapAgentCount > 0) || (snapAgentCount >
        featureSnapAgentCount)){
        return true;
    }
    else{
        return false;
    }
}

public void addNewSnapAgent(){
    IEngineEditor editor = new EngineEditor();
    IEngineEditLayers editLayers = (IEngineEditLayers)editor;
    IEngineSnapEnvironment snapEnvironment = (IEngineSnapEnvironment)editor;

    //Check the user is editing; otherwise, there will be no
    //snap agent loaded that needs to be cleared. 

    if (editLayers.IEngineEditLayers_getTargetLayer() == null){
        System.out.println("Please start an edit session");
        return ;
    }

    //Clear all existing snap agents.
    snapEnvironment.clearSnapAgents();

    //Create a feature snap agent. 
    IEngineFeatureSnapAgent featureSnapAgent = new EngineFeatureSnap();
    IFeatureClass layerFeatureClass = editLayers.IEngineEditLayers_getTargetLayer()
        .getFeatureClass();
    featureSnapAgent.setFeatureClassByRef(layerFeatureClass);
    featureSnapAgent.setHitType(esriGeometryHitPartType.esriGeometryPartBoundary);

    //Activate only the snap agent for the target layer.
    snapEnvironment.addSnapAgent(featureSnapAgent);
}