Implemented more Steps, fixed some bugs, added helper methods

.gitignore

@@ -0,0 +1,4 @@
+.idea
+target
+
+*.idb

FoodChain.iml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4" />

pom.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>cz.cvut.fel.sit.omo.foodchain</groupId>
+    <artifactId>FoodChain</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <dependencies>
+        <dependency>
+            <groupId>javax.money</groupId>
+            <artifactId>money-api</artifactId>
+            <version>1.0</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <maven.compiler.target>12</maven.compiler.target>
+        <maven.compiler.source>12</maven.compiler.source>
+    </properties>
+
+</project>

src/main/java/cz/cvut/fel/sit/omo/foodchain/FoodChain.java

@@ -0,0 +1,16 @@
+package cz.cvut.fel.sit.omo.foodchain;
+
+import cz.cvut.fel.sit.omo.foodchain.factory.FactoryManager;
+
+public class FoodChain {
+
+    private static FactoryManager factoryManager = new FactoryManager();
+
+    public static void main(String[] args) {
+
+    }
+
+    public static FactoryManager getFactoryManager() {
+        return factoryManager;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/channel/ChannelBase.java

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+package cz.cvut.fel.sit.omo.foodchain.channel;
+
+import cz.cvut.fel.sit.omo.foodchain.operation.Transaction;
+import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
+import cz.cvut.fel.sit.omo.foodchain.requirement.Requirement;
+import cz.cvut.fel.sit.omo.foodchain.util.ChannelObserver;
+import cz.cvut.fel.sit.omo.foodchain.util.Observable;
+
+import java.util.PriorityQueue;
+import java.util.Queue;
+import java.util.Set;
+
+public abstract class ChannelBase implements Observable {
+    protected ProductType productType;
+    protected Queue<Requirement> requirements;
+    protected Queue<Transaction> transactions;
+
+    private Set<ChannelObserver> subscribers;
+
+    public ChannelBase(ProductType type)
+    {
+        this.requirements = new PriorityQueue<>();
+        this.transactions = new PriorityQueue<>();
+        this.productType = type;
+    }
+
+    public ChannelBase()
+    {
+        this.requirements = new PriorityQueue<>();
+        this.transactions = new PriorityQueue<>();
+        this.productType = ProductType.OTHER;
+    }
+
+    public Queue<Transaction> getTransactions()
+    {
+        return this.transactions;
+    }
+
+    public Queue<Requirement> getCurrentRequirements()
+    {
+        return this.requirements;
+    }
+
+    /**
+     * Adds new requirement to the requirement Queue
+     * @param requirement requirement
+     */
+    public void addRequirement(Requirement requirement)
+    {
+        this.requirements.add(requirement);
+        notifyAllObservers();
+    }
+
+    @Override
+    public void notifyAllObservers(){
+        subscribers.forEach(subscriber -> subscriber.update(requirements.peek()));
+    }
+
+    @Override
+    public void attach(ChannelObserver observer){
+        subscribers.add(observer);
+    }
+
+    @Override
+    public void detach(ChannelObserver observer){
+        subscribers.remove(observer);
+    }
+
+    /**
+     * Adds new transaction to the transaction Queue
+     * @param transaction transaction
+     */
+    public void addTransaction(Transaction transaction)
+    {
+        this.transactions.add(transaction);
+    }
+
+    /**
+     * Clears all requirements from this channel
+     */
+    public void clearRequirements()
+    {
+        this.requirements.clear();
+    }
+
+    public ProductType getProductType() {
+        return productType;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/channel/FruitChannel.java

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+package cz.cvut.fel.sit.omo.foodchain.channel;
+
+import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
+
+public class FruitChannel extends ChannelBase
+{
+    public FruitChannel()
+    {
+        super(ProductType.FRUIT);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/channel/MeatChannel.java

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+package cz.cvut.fel.sit.omo.foodchain.channel;
+
+import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
+
+public class MeatChannel extends ChannelBase
+{
+    public MeatChannel()
+    {
+        super(ProductType.MEAT);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/channel/OtherChannel.java

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+package cz.cvut.fel.sit.omo.foodchain.channel;
+
+import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
+
+public class OtherChannel extends ChannelBase
+{
+    public OtherChannel()
+    {
+        super();
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/channel/VegetableChannel.java

@@ -0,0 +1,11 @@
+package cz.cvut.fel.sit.omo.foodchain.channel;
+
+import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
+
+public class VegetableChannel extends ChannelBase
+{
+    public VegetableChannel()
+    {
+        super(ProductType.VEGETABLE);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/factory/ChannelFactory.java

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+package cz.cvut.fel.sit.omo.foodchain.factory;
+
+public class ChannelFactory {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/factory/FactoryManager.java

@@ -0,0 +1,55 @@
+package cz.cvut.fel.sit.omo.foodchain.factory;
+
+import cz.cvut.fel.sit.omo.foodchain.pool.PoolDatabase;
+import cz.cvut.fel.sit.omo.foodchain.util.Singleton;
+
+import java.lang.reflect.InvocationTargetException;
+
+public class FactoryManager {
+
+    public NodeFactory getNodeFactoryInstance() {
+        try {
+            return Singleton.getInstance(NodeFactory.class);
+        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public ChannelFactory getChannelFactoryInstance() {
+        try {
+            return Singleton.getInstance(ChannelFactory.class);
+        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public ScenarioFactory getScenarioFactoryInstance() {
+        try {
+            return Singleton.getInstance(ScenarioFactory.class);
+        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public ProductFactory getProductFactoryInstance() {
+        try {
+            return Singleton.getInstance(ProductFactory.class);
+        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public PoolDatabase getPoolDatabaseInstance() {
+        try {
+            return Singleton.getInstance(PoolDatabase.class);
+        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+}
+

src/main/java/cz/cvut/fel/sit/omo/foodchain/factory/NodeFactory.java

@@ -0,0 +1,4 @@
+package cz.cvut.fel.sit.omo.foodchain.factory;
+
+public class NodeFactory {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/factory/ProductFactory.java

@@ -0,0 +1,4 @@
+package cz.cvut.fel.sit.omo.foodchain.factory;
+
+public class ProductFactory {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/factory/ScenarioFactory.java

@@ -0,0 +1,4 @@
+package cz.cvut.fel.sit.omo.foodchain.factory;
+
+public class ScenarioFactory {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/BuyerNodeBase.java

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+package cz.cvut.fel.sit.omo.foodchain.node;
+
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public class BuyerNodeBase extends NodeBase implements IBuyerNode {
+
+    @Override
+    public void buyProduct(Product product) {
+
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/Customer.java

@@ -0,0 +1,11 @@
+package cz.cvut.fel.sit.omo.foodchain.node;
+
+import java.util.Random;
+
+public class Customer extends BuyerNodeBase {
+
+    public void consumeProduct() {
+        int i = new Random().nextInt(getStorage().size());
+        getStorage().remove(i);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/Distributor.java

@@ -0,0 +1,4 @@
+package cz.cvut.fel.sit.omo.foodchain.node;
+
+public class Distributor extends RetailerNodeBase {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/Farmer.java

@@ -0,0 +1,12 @@
+package cz.cvut.fel.sit.omo.foodchain.node;
+
+import cz.cvut.fel.sit.omo.foodchain.operation.TransactionType;
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public class Farmer extends SellerNodeBase {
+
+    public void generateProduct(Product product) {
+        storeProduct(product);
+        createRequirement(TransactionType.SALE, product.getProductType(), product.getName());
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/IBuyerNode.java

@@ -0,0 +1,8 @@
+package cz.cvut.fel.sit.omo.foodchain.node;
+
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public interface IBuyerNode {
+
+    void buyProduct(Product product);
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/ISellerNode.java

@@ -0,0 +1,10 @@
+package cz.cvut.fel.sit.omo.foodchain.node;
+
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public interface ISellerNode {
+
+    void sellProduct(Product product);
+
+    void addMargin(Product product);
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/NodeBase.java

@@ -0,0 +1,135 @@
+package cz.cvut.fel.sit.omo.foodchain.node;
+
+import cz.cvut.fel.sit.omo.foodchain.channel.ChannelBase;
+import cz.cvut.fel.sit.omo.foodchain.operation.*;
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
+import cz.cvut.fel.sit.omo.foodchain.requirement.Requirement;
+import cz.cvut.fel.sit.omo.foodchain.signature.Signature;
+import cz.cvut.fel.sit.omo.foodchain.signature.SignatureManager;
+import cz.cvut.fel.sit.omo.foodchain.util.ChannelObserver;
+
+import javax.money.MonetaryAmount;
+import java.util.LinkedList;
+import java.util.List;
+
+
+public class NodeBase implements ChannelObserver {
+    private final List<ChannelBase> subscribedChannels;
+    private final List<Product> products;
+    private MonetaryAmount money;
+
+    private final List<Transaction> refusedTranslations;
+
+    public NodeBase() {
+        subscribedChannels = new LinkedList<>();
+        products = new LinkedList<>();
+        refusedTranslations = new LinkedList<>();
+    }
+
+
+    public void sendTransaction(Product product, NodeBase node) {
+        Transaction transaction = new ProductTransaction(this, node, TransactionType.SALE, product);
+
+        subscribedChannels.stream()
+                .filter(ch -> ch.getProductType().equals(product.getProductType()))
+                .findAny().ifPresent(channel -> channel.addTransaction(transaction));
+    }
+
+
+    public void sendTransaction(MonetaryAmount amount, NodeBase node, ProductTransaction prevTransaction) {
+        Transaction transaction = new FinancialTransaction(this, node, TransactionType.PURCHASE, amount, prevTransaction);
+
+        subscribedChannels.stream()
+                .filter(ch -> ch.getProductType().equals(prevTransaction.getProduct().getProductType()))
+                .findAny().ifPresent(channel -> channel.addTransaction(transaction));
+    }
+
+
+    public void receiveTransaction(ProductTransaction transaction) {
+
+    }
+
+
+    public void receiveTransaction(FinancialTransaction transaction) {
+
+    }
+
+
+    public void refuseTransaction(Transaction transaction) {
+        transaction.endTransaction();
+        refusedTranslations.add(transaction); //TODO maybe need more work on it
+    }
+
+    public Transaction readNextTransaction(ChannelBase channel) {
+
+
+        return channel.getNextTransaction();
+    }
+
+
+    public void createRequirement(TransactionType tType, ProductType pType, String pName) {
+        Requirement req = new Requirement(this, tType, pType, pName);
+        subscribedChannels.stream()
+                .filter(ch -> ch.getProductType().equals(pType))
+                .findAny().ifPresent(channel -> channel.addRequirement(req));
+    }
+
+    public void acceptRequirement(Requirement requirement) {
+
+    }
+
+
+    public void subscribeToChannel(ChannelBase channel) {
+        subscribedChannels.add(channel);
+    }
+
+
+    public void unsubscribeFromChannel(ChannelBase channel) {
+        subscribedChannels.remove(channel);
+    }
+
+
+    public void doAction(ProductOperationType action, Product product) {
+        Action actionProcess = new Action(this, product, action);
+    }
+
+
+    public void doAction(ProductOperationType action) {
+        //create new action
+    }
+
+
+    public void storeProduct(Product product) {
+        this.products.add(product);
+    }
+
+
+    public void storeProducts(List<Product> products) {
+        this.products.addAll(products);
+    }
+
+
+    public Product getProductFromStorage(String name, ProductType type) {
+        return products.stream().filter(ch -> ch.getProductType() == type && ch.getName().equals(name)).findFirst().orElse(null);
+    }
+
+    public List<Product> getStorage() {
+        return products;
+    }
+
+    public Signature generateSignature(Transaction transaction) {
+        return SignatureManager.signTransaction(transaction);
+    }
+
+
+    public boolean validateSignature(Transaction transaction) {
+        return SignatureManager.validateSignature(transaction);
+    }
+
+    @Override
+    public void update(Requirement requirement) {
+        if (!requirement.getCreator().equals(this))
+            acceptRequirement(requirement);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/Processor.java

@@ -0,0 +1,4 @@
+package cz.cvut.fel.sit.omo.foodchain.node;
+
+public class Processor extends RetailerNodeBase {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/RetailerNodeBase.java

@@ -0,0 +1,20 @@
+package cz.cvut.fel.sit.omo.foodchain.node;
+
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public class RetailerNodeBase extends NodeBase implements IBuyerNode, ISellerNode {
+    @Override
+    public void sellProduct(Product product) {
+
+    }
+
+    @Override
+    public void addMargin(Product product) {
+
+    }
+
+    @Override
+    public void buyProduct(Product product) {
+
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/Seller.java

@@ -0,0 +1,4 @@
+package cz.cvut.fel.sit.omo.foodchain.node;
+
+public class Seller extends RetailerNodeBase {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/node/SellerNodeBase.java

@@ -0,0 +1,15 @@
+package cz.cvut.fel.sit.omo.foodchain.node;
+
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public class SellerNodeBase extends NodeBase implements ISellerNode {
+    @Override
+    public void sellProduct(Product product) {
+
+    }
+
+    @Override
+    public void addMargin(Product product) {
+
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Action.java

@@ -0,0 +1,44 @@
+package cz.cvut.fel.sit.omo.foodchain.operation;
+
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public class Action extends OperationBase {
+
+    private final OperationBase lastOperation;
+    private final Product product;
+    private final ProductOperationType type;
+    private int duration;
+
+    public Action(NodeBase node, Product product, ProductOperationType type) {
+        super(node);
+        this.product = product;
+        this.type = type;
+        lastOperation = product.getCurrentOperation();
+        duration = type.getDuration();
+        product.setCurrentOperation(this);
+        product.setStateToReadyForDispatch();
+    }
+
+    private void endAction() {
+        this.setTimeEnd();
+        product.setStateToAvailable();
+    }
+
+    public void tick() {
+        if (duration == 0) endAction();
+        else duration--;
+    }
+
+    public OperationBase getLastOperation() {
+        return lastOperation;
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public ProductOperationType getType() {
+        return type;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/FinancialTransaction.java

@@ -0,0 +1,25 @@
+package cz.cvut.fel.sit.omo.foodchain.operation;
+
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+
+import javax.money.MonetaryAmount;
+
+public class FinancialTransaction extends Transaction {
+
+    private final MonetaryAmount amount;
+    private final ProductTransaction transactionPaid;
+
+    public FinancialTransaction(NodeBase creator, NodeBase receiver, TransactionType type, MonetaryAmount amount, ProductTransaction transactionPaid) {
+        super(creator, receiver, type);
+        this.amount = amount;
+        this.transactionPaid = transactionPaid;
+    }
+
+    public MonetaryAmount getAmount() {
+        return amount;
+    }
+
+    public ProductTransaction getTransactionPaid() {
+        return transactionPaid;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/OperationBase.java

@@ -0,0 +1,34 @@
+package cz.cvut.fel.sit.omo.foodchain.operation;
+
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+
+import java.time.LocalDateTime;
+
+public class OperationBase {
+
+    private final LocalDateTime timeStart;
+    private LocalDateTime timeEnd;
+
+    private final NodeBase nodeCreator;
+
+    OperationBase(NodeBase node) {
+        nodeCreator = node;
+        timeStart = LocalDateTime.now();
+    }
+
+    public LocalDateTime getTimeStart() {
+        return timeStart;
+    }
+
+    public LocalDateTime getTimeEnd() {
+        return timeEnd;
+    }
+
+    public void setTimeEnd() {
+        this.timeEnd = LocalDateTime.now();
+    }
+
+    public NodeBase getNodeCreator() {
+        return nodeCreator;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/ProductOperationType.java

@@ -0,0 +1,22 @@
+package cz.cvut.fel.sit.omo.foodchain.operation;
+
+public enum ProductOperationType {
+
+    STORE_MEAT(10, -8);
+
+    private final int duration;
+    private final int temperature;
+
+    ProductOperationType(int duration, int temperature) {
+        this.duration = duration;
+        this.temperature = temperature;
+    }
+
+    public int getDuration() {
+        return duration;
+    }
+
+    public int getTemperature() {
+        return temperature;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/ProductTransaction.java

@@ -0,0 +1,38 @@
+package cz.cvut.fel.sit.omo.foodchain.operation;
+
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public class ProductTransaction extends Transaction {
+
+    private final OperationBase lastOperation;
+    private final Product product;
+    private final ProductOperationType type;
+
+    public ProductTransaction(NodeBase creator, NodeBase receiver, TransactionType transactionType, Product product) {
+        super(creator, receiver, transactionType);
+        this.product = product;
+        type = null;
+        lastOperation = product.getCurrentOperation();
+        product.setCurrentOperation(this);
+        product.setStateToReadyForDispatch();
+    }
+
+    @Override
+    public void endTransaction() {
+        super.endTransaction();
+        product.setStateToAvailable();
+    }
+
+    public OperationBase getLastOperation() {
+        return lastOperation;
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public ProductOperationType getType() {
+        return type;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Transaction.java

@@ -0,0 +1,35 @@
+package cz.cvut.fel.sit.omo.foodchain.operation;
+
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+import cz.cvut.fel.sit.omo.foodchain.signature.Signature;
+import cz.cvut.fel.sit.omo.foodchain.signature.SignatureManager;
+
+public abstract class Transaction extends OperationBase {
+
+    private final TransactionType transactionType;
+    private final Signature signature;
+    private final NodeBase nodeReceiver;
+
+    Transaction(NodeBase creator, NodeBase receiver, TransactionType type) {
+        super(creator);
+        transactionType = type;
+        nodeReceiver = receiver;
+        signature = SignatureManager.signTransaction(this);
+    }
+
+    public void endTransaction() {
+        this.setTimeEnd();
+    }
+
+    public TransactionType getTransactionType() {
+        return transactionType;
+    }
+
+    public Signature getSignature() {
+        return signature;
+    }
+
+    public NodeBase getNodeReceiver() {
+        return nodeReceiver;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/TransactionType.java

@@ -0,0 +1,6 @@
+package cz.cvut.fel.sit.omo.foodchain.operation;
+
+public enum TransactionType {
+
+    SALE, PURCHASE
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/parser/ConfigurationParser.java

@@ -0,0 +1,43 @@
+package cz.cvut.fel.sit.omo.foodchain.parser;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.xml.sax.SAXException;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import java.io.File;
+import java.io.IOException;
+
+public class ConfigurationParser {
+
+    private static Document activeDocument;
+
+    public static void parseDocument(String name) throws ParserConfigurationException, IOException, SAXException {
+        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+        factory.setValidating(true);
+        factory.setIgnoringElementContentWhitespace(true);
+        DocumentBuilder builder = factory.newDocumentBuilder();
+        File file = new File(name);
+        activeDocument = builder.parse(file);
+    }
+
+    public static ParserResult getElements(String tag) {
+        NodeList elements = activeDocument.getElementsByTagName(tag);
+        ParserResult resultList = new ParserResult();
+        for (int i = 0; i < elements.getLength(); i++) {
+            Node tmpNode = elements.item(i);
+            ParserResultElement element = new ParserResultElement();
+            for (int j = 0; j < tmpNode.getAttributes().getLength(); j++) {
+                element.addAttribute(tmpNode.getAttributes().item(i).getNodeName(), tmpNode.getAttributes().item(i).getTextContent());
+            }
+            for (int j = 0; j < tmpNode.getChildNodes().getLength(); j++) {
+                element.addChild(tmpNode.getChildNodes().item(i).getNodeName(), tmpNode.getChildNodes().item(i).getTextContent());
+            }
+            resultList.addElement(element);
+        }
+        return resultList;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/parser/ConsoleParser.java

@@ -0,0 +1,4 @@
+package cz.cvut.fel.sit.omo.foodchain.parser;
+
+public class ConsoleParser {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/parser/ParserResult.java

@@ -0,0 +1,22 @@
+package cz.cvut.fel.sit.omo.foodchain.parser;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public class ParserResult {
+
+    private final List<ParserResultElement> elements;
+
+    public ParserResult() {
+        elements = new LinkedList<>();
+    }
+
+    public void addElement(ParserResultElement element) {
+        elements.add(element);
+    }
+
+    public List<ParserResultElement> getElements() {
+        return elements;
+    }
+
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/parser/ParserResultElement.java

@@ -0,0 +1,56 @@
+package cz.cvut.fel.sit.omo.foodchain.parser;
+
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.Map;
+
+public class ParserResultElement {
+
+    private String name;
+    private Map<String, String> attributes;
+    private Map<String, String> children;
+
+    public ParserResultElement() {
+        attributes = new HashMap<>();
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Map<String, String> getAttributes() {
+        return attributes;
+    }
+
+    public void setAttributes(Map<String, String> attributes) {
+        this.attributes = attributes;
+    }
+
+    public void addAttribute(String key, String value) {
+        attributes.put(key, value);
+    }
+
+    public String getAttribute(String key) {
+        return attributes.get(key);
+    }
+
+    public Map<String, String> getChildren() {
+        return children;
+    }
+
+    public void setChildren(Map<String, String> children) {
+        this.children = children;
+    }
+
+    public void addChild(String key, String value) {
+        children.put(key, value);
+    }
+
+    public String getChild(String key) {
+        return children.get(key);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/pool/ChannelPool.java

@@ -0,0 +1,11 @@
+package cz.cvut.fel.sit.omo.foodchain.pool;
+
+import cz.cvut.fel.sit.omo.foodchain.channel.ChannelBase;
+import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
+
+public class ChannelPool extends PoolListBase<ChannelBase> {
+
+    public ChannelBase findByType(ProductType type) {
+        return findAll().stream().filter(ch -> ch.getProductType().equals(type)).findFirst().orElse(null);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/pool/NodePool.java

@@ -0,0 +1,7 @@
+package cz.cvut.fel.sit.omo.foodchain.pool;
+
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+
+public class NodePool extends PoolListBase<NodeBase> {
+    //TODO Tomas Angelo
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/pool/PoolDatabase.java

@@ -0,0 +1,44 @@
+package cz.cvut.fel.sit.omo.foodchain.pool;
+
+import cz.cvut.fel.sit.omo.foodchain.util.Singleton;
+
+import java.lang.reflect.InvocationTargetException;
+
+public class PoolDatabase {
+
+    public ChannelPool getChannelPoolInstance() {
+        try {
+            return Singleton.getInstance(ChannelPool.class);
+        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public NodePool getNodePoolInstance() {
+        try {
+            return Singleton.getInstance(NodePool.class);
+        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public ProductPool getProductPoolInstance() {
+        try {
+            return Singleton.getInstance(ProductPool.class);
+        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public ScenarioPool getScenarioPoolInstance() {
+        try {
+            return Singleton.getInstance(ScenarioPool.class);
+        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/pool/PoolListBase.java

@@ -0,0 +1,32 @@
+package cz.cvut.fel.sit.omo.foodchain.pool;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public abstract class PoolListBase<T> {
+    List<T> pool;
+
+    public PoolListBase() {
+        pool = new LinkedList<T>();
+    }
+
+    public List<T> findAll() {
+        return pool;
+    }
+
+    public void add(T element) {
+        pool.add(element);
+    }
+
+    public void remove(T element) {
+        pool.remove(element);
+    }
+
+    public void clear() {
+        pool.clear();
+    }
+
+    public boolean contains(T element) {
+        return pool.contains(element);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/pool/ProductPool.java

@@ -0,0 +1,6 @@
+package cz.cvut.fel.sit.omo.foodchain.pool;
+
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public class ProductPool extends PoolListBase<Product> {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/pool/ScenarioPool.java

@@ -0,0 +1,6 @@
+package cz.cvut.fel.sit.omo.foodchain.pool;
+
+import cz.cvut.fel.sit.omo.foodchain.scenario.Scenario;
+
+public class ScenarioPool extends PoolListBase<Scenario> {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/product/Product.java

@@ -0,0 +1,124 @@
+package cz.cvut.fel.sit.omo.foodchain.product;
+
+import cz.cvut.fel.sit.omo.foodchain.operation.OperationBase;
+
+public class Product
+{
+    private ProductState productState;
+    private ProductType productType;
+    private OperationBase currentOperation;
+
+    private String name;
+
+    /**
+     * Creates Product with default state AVAILABLE
+     * @param name name of product
+     * @param productType type of product
+     */
+    public Product(String name, ProductType productType)
+    {
+        this.name = name;
+        this.productType =  productType;
+        this.productState = ProductState.AVAILABLE;
+    }
+
+    /**
+     * Creates Product
+     * @param name name of product
+     * @param productType type of product
+     * @param productState state of product
+     */
+    public Product(String name, ProductType productType, ProductState productState)
+    {
+        this.name = name;
+        this.productType =  productType;
+        this.productState = productState;
+    }
+
+    // "State machine methods"
+
+    /**
+     * Set current product state to AVAILABLE
+     */
+    public void setStateToAvailable()
+    {
+        this.productState = ProductState.AVAILABLE;
+    }
+
+    /**
+     * Set current product state to READY_FOR_DISPATCH. Throws IllegalStateException if the product is not AVAILABLE.
+     */
+    public void setStateToReadyForDispatch()
+    {
+        if(this.productState.equals(ProductState.AVAILABLE))
+            this.productState = ProductState.READY_FOR_DISPATCH;
+        else
+            throw new IllegalStateException("Cannot set state READY_FOR_DISPATCH. Product is not AVAILABLE!");
+    }
+
+    /**
+     * Set current product state to IN_TRANSIT. Throws IllegalStateException if the product is not READY_FOR_DISPATCH.
+     */
+    public void setStateToInTransit()
+    {
+        if(this.productState.equals(ProductState.READY_FOR_DISPATCH))
+            this.productState = ProductState.IN_TRANSIT;
+        else
+            throw new IllegalStateException("Cannot set state IN_TRANSIT. Product is not READY_FOR_DISPATCH!");
+    }
+
+    /**
+     * Set current product state to READY_FOR_RECEPTION. Throws IllegalStateException if the product is not READY_FOR_RECEPTION.
+     */
+    public void setStateToReadyForReception()
+    {
+        if(this.productState.equals(ProductState.IN_TRANSIT))
+            this.productState = ProductState.READY_FOR_RECEPTION;
+        else
+            throw new IllegalStateException("Cannot set state READY_FOR_RECEPTION. Product has not been in transit!");
+    }
+
+    /*
+    public void setProductState(ProductState productState)
+    {
+        this.productState = productState;
+    }*/
+
+
+    //Getters & Setters
+
+    public ProductState getProductState()
+    {
+        return productState;
+    }
+
+    public ProductType getProductType()
+    {
+        return productType;
+    }
+
+    public void setProductType(ProductType productType)
+    {
+        this.productType = productType;
+    }
+
+    public String getName()
+    {
+        return name;
+    }
+
+    public void setName(String name)
+    {
+        this.name = name;
+    }
+
+    public OperationBase getCurrentOperation()
+    {
+        return currentOperation;
+    }
+
+    public void setCurrentOperation(OperationBase currentOperation)
+    {
+        this.currentOperation = currentOperation;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/product/ProductState.java

@@ -0,0 +1,6 @@
+package cz.cvut.fel.sit.omo.foodchain.product;
+
+public enum ProductState
+{
+    AVAILABLE, READY_FOR_DISPATCH, IN_TRANSIT, READY_FOR_RECEPTION;
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/product/ProductType.java

@@ -0,0 +1,6 @@
+package cz.cvut.fel.sit.omo.foodchain.product;
+
+public enum ProductType
+{
+    MEAT, FRUIT, VEGETABLE, OTHER;
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/reporting/ReportTextFileVisitor.java

@@ -0,0 +1,19 @@
+package cz.cvut.fel.sit.omo.foodchain.reporting;
+
+import cz.cvut.fel.sit.omo.foodchain.channel.ChannelBase;
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+import cz.cvut.fel.sit.omo.foodchain.operation.OperationBase;
+
+public class ReportTextFileVisitor {
+    public void visit(NodeBase node){
+
+    }
+
+    public void visit(OperationBase operationBase){
+
+    }
+
+    public void visit(ChannelBase channel){
+
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/reporting/ReportingManager.java

@@ -0,0 +1,4 @@
+package cz.cvut.fel.sit.omo.foodchain.reporting;
+
+public class ReportingManager {
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/requirement/Requirement.java

@@ -0,0 +1,46 @@
+package cz.cvut.fel.sit.omo.foodchain.requirement;
+
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+import cz.cvut.fel.sit.omo.foodchain.operation.TransactionType;
+import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
+
+public class Requirement {
+
+    private final NodeBase creator;
+    private final TransactionType transactionType;
+    private final ProductType productType;
+    private final String productName;
+    private int TTL;
+
+    public Requirement(NodeBase creator, TransactionType transactionType, ProductType productType, String productName) {
+        this.creator = creator;
+        this.transactionType = transactionType;
+        this.productType = productType;
+        this.productName = productName;
+        TTL = 2;
+    }
+
+    public void tick() {
+        TTL--;
+    }
+
+    public NodeBase getCreator() {
+        return creator;
+    }
+
+    public TransactionType getTransactionType() {
+        return transactionType;
+    }
+
+    public ProductType getProductType() {
+        return productType;
+    }
+
+    public String getProductName() {
+        return productName;
+    }
+
+    public int getTTL() {
+        return TTL;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/scenario/ConsumeProductStep.java

@@ -0,0 +1,17 @@
+package cz.cvut.fel.sit.omo.foodchain.scenario;
+
+import cz.cvut.fel.sit.omo.foodchain.node.Customer;
+
+public class ConsumeProductStep extends ScenarioStep {
+
+    private Customer node;
+
+    public ConsumeProductStep(Customer node) {
+        this.node = node;
+    }
+
+    @Override
+    void execute() {
+        node.consumeProduct();
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/scenario/DoActionStep.java

@@ -0,0 +1,32 @@
+package cz.cvut.fel.sit.omo.foodchain.scenario;
+
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+import cz.cvut.fel.sit.omo.foodchain.operation.ProductOperationType;
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public class DoActionStep extends ScenarioStep {
+    private final NodeBase nodeBase;
+    private final ProductOperationType productOperationType;
+    private final Product product;
+
+    public DoActionStep(NodeBase node, ProductOperationType productOperationType, Product product){
+        this.nodeBase = node;
+        this.productOperationType = productOperationType;
+        this.product = product;
+    }
+
+    public DoActionStep(NodeBase node, ProductOperationType productOperationType){
+        this(node, productOperationType, null);
+    }
+
+
+    @Override
+    void execute() {
+        if (product != null){
+            nodeBase.doAction(productOperationType, product);
+        }
+        else {
+            nodeBase.doAction(productOperationType);
+        }
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/scenario/GenerateProductStep.java

@@ -0,0 +1,24 @@
+package cz.cvut.fel.sit.omo.foodchain.scenario;
+
+import cz.cvut.fel.sit.omo.foodchain.FoodChain;
+import cz.cvut.fel.sit.omo.foodchain.node.Farmer;
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+public class GenerateProductStep extends ScenarioStep {
+
+    private Farmer node;
+    private Product product;
+
+    public GenerateProductStep(Farmer node) {
+        this.node = node;
+        product = FoodChain.getFactoryManager().getPoolDatabaseInstance().getProductPoolInstance().findAll()
+                .stream().findFirst().orElse(null);
+        FoodChain.getFactoryManager().getPoolDatabaseInstance().getProductPoolInstance().remove(product);
+    }
+
+    @Override
+    void execute() {
+        node.generateProduct(product);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/scenario/Scenario.java

@@ -0,0 +1,26 @@
+package cz.cvut.fel.sit.omo.foodchain.scenario;
+
+import java.util.Iterator;
+import java.util.List;
+
+public class Scenario {
+    List<ScenarioStep> steps;
+    Iterator<ScenarioStep> stepIterator;
+
+    public Scenario() {
+        //steps = //TODO init
+        stepIterator = steps.listIterator(0);
+    }
+
+    public Scenario(List<ScenarioStep> steps) {
+        this.steps = steps;
+        stepIterator = steps.listIterator(0);
+    }
+
+    void execute() {
+        if (!stepIterator.hasNext()) {
+            stepIterator = steps.listIterator(0);
+        }
+        stepIterator.next().execute();
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/scenario/ScenarioStep.java

@@ -0,0 +1,5 @@
+package cz.cvut.fel.sit.omo.foodchain.scenario;
+
+public abstract class ScenarioStep {
+    abstract void execute();
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/scenario/SendRequirementStep.java

@@ -0,0 +1,24 @@
+package cz.cvut.fel.sit.omo.foodchain.scenario;
+
+import cz.cvut.fel.sit.omo.foodchain.node.NodeBase;
+import cz.cvut.fel.sit.omo.foodchain.operation.TransactionType;
+import cz.cvut.fel.sit.omo.foodchain.product.ProductType;
+
+public class SendRequirementStep extends ScenarioStep {
+    private final NodeBase node;
+    private final TransactionType tType;
+    private final ProductType pType;
+    private final String pName;
+
+    public SendRequirementStep(NodeBase node, TransactionType tType, ProductType pType, String pName) {
+        this.node = node;
+        this.tType = tType;
+        this.pType = pType;
+        this.pName = pName;
+    }
+
+    @Override
+    void execute() {
+        node.createRequirement(tType, pType, pName);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/signature/Signature.java

@@ -0,0 +1,39 @@
+package cz.cvut.fel.sit.omo.foodchain.signature;
+
+import cz.cvut.fel.sit.omo.foodchain.operation.Transaction;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+public class Signature {
+
+    private final String managerCode;
+    private final Transaction transaction;
+    private final LocalDateTime signedDate;
+    private final UUID uuid;
+
+    public Signature(String code, Transaction transaction) {
+        managerCode = code;
+        this.transaction = transaction;
+        signedDate = LocalDateTime.now();
+        uuid = UUID.randomUUID();
+    }
+
+    public Transaction getTransaction(String code) {
+        if (code.equals(managerCode))
+            return transaction;
+        return null;
+    }
+
+    public LocalDateTime getSignedDate(String code) {
+        if (code.equals(managerCode))
+            return signedDate;
+        return null;
+    }
+
+    public UUID getUuid(String code) {
+        if (code.equals(managerCode))
+            return uuid;
+        return null;
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/signature/SignatureManager.java

@@ -0,0 +1,17 @@
+package cz.cvut.fel.sit.omo.foodchain.signature;
+
+import cz.cvut.fel.sit.omo.foodchain.operation.Transaction;
+
+public class SignatureManager {
+
+    private static final String MANAGER_CODE = "iW91AJWNOCmX1pbpLlW0";
+
+    public static Signature signTransaction(Transaction transaction) {
+        return new Signature(MANAGER_CODE, transaction);
+    }
+
+    public static boolean validateSignature(Transaction transaction) {
+        return transaction.equals(transaction.getSignature().getTransaction(MANAGER_CODE))
+                && transaction.getSignature().getUuid(MANAGER_CODE).equals(transaction.getSignature().getTransaction(MANAGER_CODE).getSignature().getUuid(MANAGER_CODE));
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/util/ChannelObserver.java

@@ -0,0 +1,7 @@
+package cz.cvut.fel.sit.omo.foodchain.util;
+
+import cz.cvut.fel.sit.omo.foodchain.requirement.Requirement;
+
+public interface ChannelObserver {
+    void update(Requirement requirement);
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/util/Observable.java

@@ -0,0 +1,7 @@
+package cz.cvut.fel.sit.omo.foodchain.util;
+
+public interface Observable {
+    void attach(ChannelObserver channelObserver);
+    void detach(ChannelObserver channelObserver);
+    void notifyAllObservers();
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/util/Singleton.java

@@ -0,0 +1,27 @@
+package cz.cvut.fel.sit.omo.foodchain.util;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Singleton {
+
+    private static final Singleton instance = new Singleton();
+
+    @SuppressWarnings("rawtypes")
+    private final Map<Class, Object> mapHolder = new HashMap<>();
+
+    private Singleton() {
+    }
+
+    public static <T> T getInstance(Class<T> tClass) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException, InstantiationException {
+        if (!instance.mapHolder.containsKey(tClass)) {
+            Constructor<T> cons = tClass.getConstructor();
+            Object object = cons.newInstance();
+            instance.mapHolder.put(tClass, object);
+        }
+
+        return (T) instance.mapHolder.get(tClass);
+    }
+}

src/main/java/cz/cvut/fel/sit/omo/foodchain/util/Ticker.java

@@ -0,0 +1,26 @@
+package cz.cvut.fel.sit.omo.foodchain.util;
+
+import cz.cvut.fel.sit.omo.foodchain.FoodChain;
+import cz.cvut.fel.sit.omo.foodchain.pool.PoolDatabase;
+
+import javax.swing.*;
+
+public class Ticker {
+
+    private static Timer timer;
+
+    public static void start() {
+        timer = new Timer(500, actionEvent -> {
+            PoolDatabase db = FoodChain.getFactoryManager().getPoolDatabaseInstance();
+            db.getChannelPoolInstance().findAll().forEach(ch -> ch.tick()); // change TTL of requirements
+            db.getNodePoolInstance().findAll().forEach(ch -> ch.tick()); // do next step in scenario
+            db.getProductPoolInstance().findAll().forEach(ch -> ch.tick()); // change duration of action
+            db.getScenarioPoolInstance().findAll().forEach(ch -> ch.tick()); // maybe unnecessary
+        });
+        timer.start();
+    }
+
+    public static void stop() {
+        timer.stop();
+    }
+}