POJO to help with checking that expansions have all required methods implemented.

src/main/java/me/clip/placeholderapi/expansion/manager/MethodSignature.java

@@ -0,0 +1,37 @@
+package me.clip.placeholderapi.expansion.manager;
+
+import java.util.Arrays;
+import java.util.Objects;
+
+public final class MethodSignature {
+    private final String name;
+    private final Class<?>[] params;
+
+    protected MethodSignature(String name, Class<?>[] params) {
+        this.name = name;
+        this.params = params;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Class<?>[] getParams() {
+        return params;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        MethodSignature that = (MethodSignature) o;
+        return Objects.equals(name, that.name) && Arrays.equals(params, that.params);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = Objects.hash(name);
+        result = 31 * result + Arrays.hashCode(params);
+        return result;
+    }
+}