Initial companies list

app/src/main/java/protect/card_locker/Companies.java

@@ -0,0 +1,33 @@
+package protect.card_locker;
+
+import com.google.zxing.BarcodeFormat;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+public class Companies {
+    static HashMap<String, List<Company>> companies = new HashMap<>();
+
+    public List<Company> getByISOCode(String isoCode) {
+        switch (isoCode) {
+            case "NL":
+                return NLCompanies();
+            default:
+                throw new IllegalArgumentException(isoCode + " is not supported");
+        }
+    }
+
+    public List<Company> NLCompanies() {
+        List<Company> comps = new ArrayList<>();
+
+        if (!companies.containsKey("NL")) {
+            comps.add(new Company.Builder("Albert Heijn").addBarcodeFormat(BarcodeFormat.EAN_13).create());
+            comps.add(new Company.Builder("Air Miles").addBarcodeFormat(BarcodeFormat.EAN_13).addPrefix("470").create());
+            comps.add(new Company.Builder("HEMA").addBarcodeFormat(BarcodeFormat.QR_CODE).create());
+            companies.put("NL", comps);
+        }
+
+        return comps;
+    };
+}

app/src/main/java/protect/card_locker/Company.java

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+package protect.card_locker;
+
+import com.google.zxing.BarcodeFormat;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import protect.card_locker.translationRules.AddPrefixTranslationRule;
+import protect.card_locker.translationRules.TranslationRule;
+
+public class Company {
+    private final String name;
+    private final List<BarcodeFormat> barcodeFormats;
+    private final List<TranslationRule> translationRuleList;
+
+    private Company(final Builder builder) {
+        name = builder.name;
+        barcodeFormats = builder.barcodeFormats;
+        translationRuleList = builder.translationRuleList;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String cardIDToBarcode(String cardID) {
+        String barcode = cardID;
+        for (int i = 0; i < translationRuleList.size(); i++) {
+            barcode = translationRuleList.get(i).apply(barcode);
+        }
+
+        return barcode;
+    }
+
+    public String BarcodeToCardID(String barcode) {
+        String cardID = barcode;
+        for (int i = translationRuleList.size() - 1; i > 0; i--) {
+            cardID = translationRuleList.get(i).undo(cardID);
+        }
+
+        return cardID;
+    }
+
+    static class Builder {
+        private final String name;
+        private final List<BarcodeFormat> barcodeFormats = new ArrayList<>();
+        private final List<TranslationRule> translationRuleList = new ArrayList<>();
+
+        public Builder(String name) {
+            this.name = name;
+        }
+
+        public Builder addBarcodeFormat(final BarcodeFormat barcodeFormat) {
+            barcodeFormats.add(barcodeFormat);
+            return this;
+        }
+
+        public Builder addPrefix(final String prefix) {
+            translationRuleList.add(new AddPrefixTranslationRule(prefix));
+            return this;
+        }
+
+        public Company create() {
+            return new Company(this);
+        }
+    }
+}

app/src/main/java/protect/card_locker/translationRules/AddPrefixTranslationRule.java

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+package protect.card_locker.translationRules;
+
+public class AddPrefixTranslationRule implements TranslationRule {
+    String prefix;
+
+    public AddPrefixTranslationRule(String prefix) {
+        this.prefix = prefix;
+    }
+
+    @Override
+    public String apply(String value) {
+        return this.prefix + value;
+    }
+
+    @Override
+    public String undo(String value) {
+        if (!value.startsWith(this.prefix)) {
+            throw new IllegalArgumentException();
+        }
+
+        return value.substring(this.prefix.length());
+    }
+}

app/src/main/java/protect/card_locker/translationRules/TranslationRule.java

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+package protect.card_locker.translationRules;
+
+public interface TranslationRule {
+    String apply(String value);
+    String undo(String value);
+}
+