Added new builder API.

byte-buddy-dep/src/main/java/net/bytebuddy/asm/ClassVisitorWrapper.java

@@ -72,6 +72,56 @@ public String toString() {
         }
     }
 
+    class FlagSetting implements ClassVisitorWrapper {
+
+        private final int writerFlags;
+
+        private final int readerFlags;
+
+        public FlagSetting(int writerFlags, int readerFlags) {
+            this.writerFlags = writerFlags;
+            this.readerFlags = readerFlags;
+        }
+
+        @Override
+        public int mergeWriter(int flags) {
+            return flags | writerFlags;
+        }
+
+        @Override
+        public int mergeReader(int flags) {
+            return flags | readerFlags;
+        }
+
+        @Override
+        public ClassVisitor wrap(ClassVisitor classVisitor) {
+            return classVisitor;
+        }
+
+        @Override
+        public boolean equals(Object other) {
+            if (this == other) return true;
+            if (other == null || getClass() != other.getClass()) return false;
+            FlagSetting that = (FlagSetting) other;
+            return writerFlags == that.writerFlags && readerFlags == that.readerFlags;
+        }
+
+        @Override
+        public int hashCode() {
+            int result = writerFlags;
+            result = 31 * result + readerFlags;
+            return result;
+        }
+
+        @Override
+        public String toString() {
+            return "ClassVisitorWrapper.FlagSetting{" +
+                    "writerFlags=" + writerFlags +
+                    ", readerFlags=" + readerFlags +
+                    '}';
+        }
+    }
+
     /**
      * An ordered, immutable chain of {@link net.bytebuddy.asm.ClassVisitorWrapper}s.
      */

byte-buddy-dep/src/main/java/net/bytebuddy/asm/FieldVisitorWrapper.java

@@ -0,0 +1,8 @@
+package net.bytebuddy.asm;
+
+import org.objectweb.asm.FieldVisitor;
+
+public interface FieldVisitorWrapper {
+
+    FieldVisitor wrap(FieldVisitor fieldVisitor);
+}

byte-buddy-dep/src/main/java/net/bytebuddy/asm/MethodVisitorWrapper.java

@@ -0,0 +1,8 @@
+package net.bytebuddy.asm;
+
+import org.objectweb.asm.MethodVisitor;
+
+public interface MethodVisitorWrapper {
+
+    MethodVisitor wrap(MethodVisitor methodVisitor);
+}

byte-buddy-dep/src/main/java/net/bytebuddy/description/modifier/ModifierContributor.java

@@ -1,7 +1,7 @@
 package net.bytebuddy.description.modifier;
 
 import java.util.Arrays;
-import java.util.List;
+import java.util.Collection;
 
 /**
  * An element that describes a type modifier as described in the
@@ -70,14 +70,18 @@ interface ForParameter extends ModifierContributor {
 
     class Resolver<T extends ModifierContributor> {
 
-        private final List<T> modifierContributors;
+        private final Collection<? extends T> modifierContributors;
 
-        protected Resolver(List<T> modifierContributors) {
+        protected Resolver(Collection<? extends T> modifierContributors) {
             this.modifierContributors = modifierContributors;
         }
 
         public static <S extends ModifierContributor> Resolver<S> of(S... modifierContributor) {
-            return new Resolver<S>(Arrays.asList(modifierContributor));
+            return of(Arrays.asList(modifierContributor));
+        }
+
+        public static <S extends ModifierContributor> Resolver<S> of(Collection<? extends S> modifierContributors) {
+            return new Resolver<S>(modifierContributors);
         }
 
         public int resolve() {
@@ -87,5 +91,23 @@ public int resolve() {
             }
             return modifiers;
         }
+
+        @Override
+        public boolean equals(Object other) {
+            return this == other || !(other == null || getClass() != other.getClass())
+                    && modifierContributors.equals(((Resolver<?>) other).modifierContributors);
+        }
+
+        @Override
+        public int hashCode() {
+            return modifierContributors.hashCode();
+        }
+
+        @Override
+        public String toString() {
+            return "ModifierContributor.Resolver{" +
+                    "modifierContributors=" + modifierContributors +
+                    '}';
+        }
     }
 }