Added utility structures + tests

src/main/java/de/rwu/easydrop/util/Config.java

@@ -52,7 +52,6 @@ public final class Config {
      * Returns current config instance.
      *
      * @return Config instance
-     * @throws ConfigurationException
      */
     public static Config getInstance() {
         if (instance == null) {

src/main/java/de/rwu/easydrop/util/ProductsConfig.java

@@ -0,0 +1,142 @@
+package de.rwu.easydrop.util;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+import javax.naming.ConfigurationException;
+
+import com.jayway.jsonpath.JsonPath;
+import com.jayway.jsonpath.JsonPathException;
+
+import de.rwu.easydrop.model.Product;
+import de.rwu.easydrop.model.ProductCatalogue;
+
+/**
+ * Reads the user-specified catalogue of products.
+ *
+ * @since 0.2.0
+ */
+public final class ProductsConfig {
+    /**
+     * Products config location.
+     */
+    private String configLocation = "config/products-config.json";
+
+    /**
+     * @return the configLocation
+     */
+    public String getConfigLocation() {
+        return configLocation;
+    }
+
+    /**
+     * @param newConfigLocation the configLocation to set
+     */
+    public void setConfigLocation(final String newConfigLocation) {
+        this.configLocation = newConfigLocation;
+    }
+
+    /**
+     * Holds the configured products.
+     */
+    private List<ProductCatalogue> productCatalogues;
+
+    /**
+     * @return the product catalogues
+     */
+    public List<ProductCatalogue> getProductCatalogues() {
+        return productCatalogues;
+    }
+
+    /**
+     * Singleton instance.
+     */
+    private static ProductsConfig instance = null;
+
+    /**
+     * Private constructor to prevent external instantiation.
+     */
+    private ProductsConfig() {
+        productCatalogues = new ArrayList<>();
+    }
+
+    /**
+     * Returns current products config instance.
+     *
+     * @return Products Config instance
+     */
+    public static ProductsConfig getInstance() {
+        if (instance == null) {
+            instance = new ProductsConfig();
+        }
+
+        return instance;
+    }
+
+    /**
+     * Loads user-specified configuration into productCatalogues attribute.
+     *
+     * @throws ConfigurationException
+     */
+    public void loadConfig() throws ConfigurationException {
+        try {
+            File jsonFile = new File(configLocation).getAbsoluteFile();
+            ArrayList<HashMap<String, Object>> jsonProducts = JsonPath.read(jsonFile, "$.products");
+
+            setProductCatalogues(jsonProducts);
+        } catch (IOException e) {
+            throw new ConfigurationException("Couldn't load required products config file");
+        } catch (JsonPathException e) {
+            throw new ConfigurationException("Products config is empty or malformed");
+        }
+    }
+
+    /**
+     * Loads catalogues from JSON.
+     *
+     * @param jsonCatalogues
+     */
+    private void setProductCatalogues(final ArrayList<HashMap<String, Object>> jsonCatalogues) {
+        for (HashMap<String, Object> productCatalogue : jsonCatalogues) {
+            String name = productCatalogue.get("name").toString();
+            String desc = productCatalogue.get("description").toString();
+            String identifiers = productCatalogue.get("identifiers").toString();
+
+            ProductCatalogue pCat = new ProductCatalogue(name, desc);
+
+            addProductsToCatalogue(identifiers, pCat);
+            productCatalogues.add(pCat);
+        }
+    }
+
+    /**
+     * Loads products from JSON.
+     *
+     * @param jsonIdentifiers
+     * @param pCat
+     */
+    private void addProductsToCatalogue(final String jsonIdentifiers, final ProductCatalogue pCat) {
+        ArrayList<HashMap<String, Object>> identifiers = JsonPath.read(jsonIdentifiers, "$");
+
+        for (HashMap<String, Object> product : identifiers) {
+            String dataOrigin = product.keySet().iterator().next();
+            String identifier = product.get(dataOrigin).toString();
+
+            Product newProduct = new Product();
+            newProduct.setDataOrigin(dataOrigin);
+            newProduct.setProductId(identifier);
+
+            pCat.addProduct(newProduct);
+        }
+    }
+
+    /**
+     * Resets the contained product catalogues.
+     */
+    public void reset() {
+        productCatalogues = new ArrayList<>();
+    }
+}

src/main/java/de/rwu/easydrop/util/package-info.java

@@ -1,6 +1,6 @@
 /**
  * General utility such as formatting helpers.
  *
- * TODO implement
+ * @since 0.1.0
  */
 package de.rwu.easydrop.util;