Class EnhancerBuilderImpl

java.lang.Object
com.google.inject.internal.aop.EnhancerBuilderImpl
All Implemented Interfaces:
BytecodeGen.EnhancerBuilder

final class EnhancerBuilderImpl extends Object implements BytecodeGen.EnhancerBuilder
Builder of enhancers that provide method interception via bytecode generation.
  • Field Details

  • Constructor Details

  • Method Details

    • getEnhanceableMethods

      public Method[] getEnhanceableMethods()
      Description copied from interface: BytecodeGen.EnhancerBuilder
      Lists the methods in the host class that can be enhanced.

      This always includes public and protected methods that are neither static nor final.

      Package-private methods can only be enhanced if they're in the same package as the host and we can define types in the same class loader with Unsafe. The Object.finalize() method can never be enhanced.

      Specified by:
      getEnhanceableMethods in interface BytecodeGen.EnhancerBuilder
    • buildEnhancer

      public Function<String,BiFunction<Object,Object[],Object>> buildEnhancer(BitSet methodIndices)
      Description copied from interface: BytecodeGen.EnhancerBuilder
      Generates an enhancer for the selected subset of methods.

      The enhancer maps constructor and method signatures to invokers, where each invoker is represented as a BiFunction that accepts a context object and an argument array.

      Constructor invokers take an array of InvocationHandlers as their context object. This is stored in the enhanced class before the original host class constructor is called, with arguments unpacked from the argument array. The enhanced instance is then returned.

      Method invokers take an enhanced instance as their context object and call the original super-method with arguments unpacked from the argument array, ie. provides super-invocation.

      Specified by:
      buildEnhancer in interface BytecodeGen.EnhancerBuilder
    • doBuildEnhancer

      private Function<String,BiFunction<Object,Object[],Object>> doBuildEnhancer(BitSet methodIndices)