Implement basic annotation system for injection

src/dev/w1zzrd/asm/AsmAnnotation.java

@@ -0,0 +1,28 @@
+package dev.w1zzrd.asm;
+
+import com.sun.istack.internal.Nullable;
+
+import java.util.Map;
+
+public final class AsmAnnotation {
+    private final String annotationType;
+    private final Map<String, Object> entries;
+
+    public AsmAnnotation(String annotationType, Map<String, Object> entries) {
+        this.annotationType = annotationType;
+        this.entries = entries;
+    }
+
+    public String getAnnotationType() {
+        return annotationType;
+    }
+
+    @Nullable
+    public <T> T getEntry(String name, Class<T> type) {
+        return hasEntry(name) ? (T)entries.get(name) : null;
+    }
+
+    public boolean hasEntry(String name) {
+        return entries.containsKey(name);
+    }
+}

src/dev/w1zzrd/asm/Inject.java

@@ -0,0 +1,10 @@
+package dev.w1zzrd.asm;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.CONSTRUCTOR, ElementType.METHOD})
+public @interface Inject { }

src/dev/w1zzrd/asm/InjectClass.java

@@ -0,0 +1,13 @@
+package dev.w1zzrd.asm;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE})
+public @interface InjectClass {
+    Class<?> value();
+    boolean injectInterfaces() default true;
+}