[rules-users] Accessing properties of an object within a Nested Collection of a Nested Collection

I am having a hard time trying to figure this out, maybe it is obvious and I have overlooked it.... I am trying to evaluate properties of a object contained within a nested collection of a nested collection on the LHS. Here is an example of the object model I am working with. *AutoManufacturer* is the parent class, with *Brand* residing in a collection on the object, with *Model* residing in a collection on *Brand*, and finally, *Part* residing in a collection of *Model*. These classes were created for illustration purposes for this question..... My question more specifically would be, on the LHS, how would I write a rule for instance that would find all *Part* objects with a Vendor of "PV999999". Secondly, on the RHS, how could I iterate the resulting collection of Part objects to print something like the partname for each of them. Here are the class objects: AutoManufacturer class ----------------------------------------------------- package com.nabble.demo.model; import java.util.ArrayList; import java.util.List; /** * Class that represents an automobile manufacturer */ public class AutoManufacturer { private String manufacturerName; private String manufacturerId; private List<Brand> brandsCollection; /** * Default constructor */ public AutoManufacturer() { this.brandsCollection = new ArrayList<Brand>(); } /** * @return the manufacturerName */ public String getManufacturerName() { return this.manufacturerName; } /** * @param manufacturerName the manufacturerName to set */ public void setManufacturerName( String manufacturerName ) { this.manufacturerName = manufacturerName; } /** * @return the manufacturerId */ public String getManufacturerId() { return this.manufacturerId; } /** * @param manufacturerId the manufacturerId to set */ public void setManufacturerId( String manufacturerId ) { this.manufacturerId = manufacturerId; } /** * @return the brandsCollection */ public List<Brand> getBrandsCollection() { return this.brandsCollection; } /** * @param brand the Brand to add to the collection */ public void addBrand( Brand brand ) { this.brandsCollection.add(brand); } } Brand class ------------------------------------------------------ package com.nabble.demo.model; import java.util.ArrayList; import java.util.List; public class Brand { private String brandName; private String brandId; private List<Model> brandModels; public Brand() { this.brandModels = new ArrayList<Model>(); } /** * @return the brandName */ public String getBrandName() { return brandName; } /** * @param brandName the brandName to set */ public void setBrandName( String brandName ) { this.brandName = brandName; } /** * @return the brandId */ public String getBrandId() { return brandId; } /** * @param brandId the brandId to set */ public void setBrandId( String brandId ) { this.brandId = brandId; } /** * @return the brandModels */ public List<Model> getBrandModels() { return brandModels; } /** * @param model the Model to add */ public void addModel( Model model ) { this.brandModels.add(model); } } Model class -------------------------------------------------------- package com.nabble.demo.model; import java.util.ArrayList; import java.util.List; /** * Class that represents a particular model of an automaker's brand of car */ public class Model { private String modelName; private String modelId; private List<Part> partsList; public Model() { this.partsList = new ArrayList<Part>(); } /** * @return the modelName */ public String getModelName() { return this.modelName; } /** * @param modelName the modelName to set */ public void setModelName( String modelName ) { this.modelName = modelName; } /** * @return the modelId */ public String getModelId() { return this.modelId; } /** * @param modelId the modelId to set */ public void setModelId( String modelId ) { this.modelId = modelId; } /** * @return the partsList */ public List<Part> getPartsList() { return this.partsList; } /** * Method to add new part to collection * * @param part */ public void addPart( Part part ) { this.partsList.add(part); } } Part Class ---------------------------------------------------------------- package com.nabble.demo.model; /** * Class that represents a part used on a Model of car */ public class Part { private String partsId; private String partsName; private String partVendor; /** * Default constructor */ public Part() { } /** * @return the partsId */ public String getPartsId() { return this.partsId; } /** * @param partsId the partsId to set */ public void setPartsId( String partsId ) { this.partsId = partsId; } /** * @return the partsName */ public String getPartsName() { return this.partsName; } /** * @param partsName the partsName to set */ public void setPartsName( String partsName ) { this.partsName = partsName; } /** * @return the partVendor */ public String getPartVendor() { return partVendor; } /** * @param partVendor the partVendor to set */ public void setPartVendor( String partVendor ) { this.partVendor = partVendor; } } Finally...... here is my class to create an instance of the AutoManufacturer object that would become the FACT for the rule to fire upon. package com.nabble.demo; import com.nabble.demo.model.AutoManufacturer; import com.nabble.demo.model.Brand; import com.nabble.demo.model.Model; import com.nabble.demo.model.Part; /** * Class to demonstrate using Autommaker model objects */ public class ProcessAutomaker { /** * @param args */ public static void main( String[] args ) { //Create instance of AutoManufacturer AutoManufacturer automanf = new AutoManufacturer(); automanf.setManufacturerId("123456"); automanf.setManufacturerName("Large Auto Maker"); //Create instance of Model Model model = new Model(); model.setModelName("LargeSUV"); model.setModelName("MN444555"); //Create instances of Part, add to current Model instance Part part = new Part(); part.setPartsId("PP123456"); part.setPartsName("Steering Wheel"); part.setPartVendor("PV999999"); model.addPart(part); part = new Part(); part.setPartsId("PP123499"); part.setPartsName("Brake Pedal"); part.setPartVendor("PV999999"); model.addPart(part); part = new Part(); part.setPartsId("PP123499"); part.setPartsName("Floor Mat"); part.setPartVendor("PV111111"); model.addPart(part); //Create instance of Brand Brand brand = new Brand(); brand.setBrandName("Brand1"); brand.setBrandId("BB123456"); brand.addModel(model); automanf.addBrand(brand); } } -- View this message in context: http://drools.46999.n3.nabble.com/Accessing-properties-of-an-object-withi... Sent from the Drools: User forum mailing list archive at Nabble.com.