Add basic providers

plugin/src/main/java/de/epiceric/shopchest/config/hologram/provider/ConstantProvider.java

@@ -0,0 +1,25 @@
+package de.epiceric.shopchest.config.hologram.provider;
+
+import de.epiceric.shopchest.config.hologram.HologramFormat;
+
+import java.util.Map;
+
+public class ConstantProvider<T> implements RequirementProvider<T> {
+
+    private final T constant;
+
+    public ConstantProvider(T constant) {
+        this.constant = constant;
+    }
+
+
+    @Override
+    public T apply(Map<HologramFormat.Requirement, Object> requirementObjectMap) {
+        return constant;
+    }
+
+    @Override
+    public String toString() {
+        return constant.toString();
+    }
+}

plugin/src/main/java/de/epiceric/shopchest/config/hologram/provider/MapProvider.java

@@ -0,0 +1,59 @@
+package de.epiceric.shopchest.config.hologram.provider;
+
+import de.epiceric.shopchest.config.hologram.HologramFormat;
+
+import java.util.Map;
+
+public abstract class MapProvider<T> implements RequirementProvider<T> {
+
+    protected final HologramFormat.Requirement requirement;
+
+    public MapProvider(HologramFormat.Requirement requirement) {
+        this.requirement = requirement;
+    }
+
+    @Override
+    public String toString() {
+        return requirement.toString();
+    }
+
+    public final static class StringMapProvider extends MapProvider<String> {
+
+        public StringMapProvider(HologramFormat.Requirement requirement) {
+            super(requirement);
+        }
+
+        @Override
+        public String apply(Map<HologramFormat.Requirement, Object> requirementValues) {
+            return (String) requirementValues.get(requirement);
+        }
+
+    }
+
+    public final static class BooleanMapProvider extends MapProvider<Boolean> {
+
+        public BooleanMapProvider(HologramFormat.Requirement requirement) {
+            super(requirement);
+        }
+
+        @Override
+        public Boolean apply(Map<HologramFormat.Requirement, Object> requirementValues) {
+            return (Boolean) requirementValues.get(requirement);
+        }
+
+    }
+
+    public final static class DoubleMapProvider extends MapProvider<Double> {
+
+        public DoubleMapProvider(HologramFormat.Requirement requirement) {
+            super(requirement);
+        }
+
+        @Override
+        public Double apply(Map<HologramFormat.Requirement, Object> requirementValues) {
+            return (Double) requirementValues.get(requirement);
+        }
+
+    }
+
+}

plugin/src/main/java/de/epiceric/shopchest/config/hologram/provider/RequirementProvider.java

@@ -0,0 +1,10 @@
+package de.epiceric.shopchest.config.hologram.provider;
+
+import de.epiceric.shopchest.config.hologram.HologramFormat;
+
+import java.util.Map;
+import java.util.function.Function;
+
+public interface RequirementProvider<T> extends Function<Map<HologramFormat.Requirement, Object>, T> {
+
+}