add XorLocatorTemplate

common/addons/config-locators/src/main/java/com/dfsek/terra/addons/feature/locator/config/XorLocatorTemplate.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2020-2021 Polyhedral Development
+ *
+ * The Terra Core Addons are licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in this module's root directory.
+ */
+
+package com.dfsek.terra.addons.feature.locator.config;
+
+import com.dfsek.tectonic.api.config.template.ValidatedConfigTemplate;
+import com.dfsek.tectonic.api.config.template.annotations.Value;
+import com.dfsek.tectonic.api.config.template.object.ObjectTemplate;
+import com.dfsek.tectonic.api.exception.ValidationException;
+
+import com.dfsek.terra.api.config.meta.Meta;
+import com.dfsek.terra.api.structure.feature.Locator;
+
+import java.util.List;
+
+
+public class XorLocatorTemplate implements ObjectTemplate<Locator>, ValidatedConfigTemplate {
+    @Value("locators")
+    private @Meta List<@Meta Locator> locators;
+    
+    @Override
+    public Locator get() {
+        Locator current = locators.remove(0);
+        while(!locators.isEmpty()) {
+            current = current.xor(locators.remove(0));
+        }
+        return current;
+    }
+    
+    @Override
+    public boolean validate() throws ValidationException {
+        if(locators.isEmpty()) throw new ValidationException("XOR Pattern must specify at least 1 pattern.");
+        return true;
+    }
+}