com.google.inject.internal.aop

Class EnhancerBuilderImpl

java.lang.Object

com.google.inject.internal.aop.EnhancerBuilderImpl

All Implemented Interfaces:

BytecodeGen.EnhancerBuilder

final class EnhancerBuilderImpl
extends java.lang.Object
implements BytecodeGen.EnhancerBuilder

Builder of enhancers that provide method interception via bytecode generation.

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.Map<java.lang.reflect.Method,java.lang.reflect.Method>	bridgeDelegates
private java.lang.reflect.Method[]	enhanceableMethods
private static java.lang.ClassValue<java.util.Map<java.util.BitSet,java.util.function.Function<java.lang.String,java.util.function.BiFunction<java.lang.Object,java.lang.Object[],java.lang.Object>>>>	ENHANCERS Lazy association between classes and their generated enhancers.
private java.lang.Class<?>	hostClass

Constructor Summary

Constructors

Constructor and Description
EnhancerBuilderImpl(java.lang.Class<?> hostClass, java.util.Collection<java.lang.reflect.Method> enhanceableMethods, java.util.Map<java.lang.reflect.Method,java.lang.reflect.Method> bridgeDelegates)

Method Summary

Modifier and Type	Method and Description
java.util.function.Function<java.lang.String,java.util.function.BiFunction<java.lang.Object,java.lang.Object[],java.lang.Object>>	buildEnhancer(java.util.BitSet methodIndices) Generates an enhancer for the selected subset of methods.
private java.util.function.Function<java.lang.String,java.util.function.BiFunction<java.lang.Object,java.lang.Object[],java.lang.Object>>	doBuildEnhancer(java.util.BitSet methodIndices)
java.lang.reflect.Method[]	getEnhanceableMethods() Lists the methods in the host class that can be enhanced.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ENHANCERS

private static final java.lang.ClassValue<java.util.Map<java.util.BitSet,java.util.function.Function<java.lang.String,java.util.function.BiFunction<java.lang.Object,java.lang.Object[],java.lang.Object>>>> ENHANCERS

Lazy association between classes and their generated enhancers.

hostClass

private final java.lang.Class<?> hostClass

enhanceableMethods

private final java.lang.reflect.Method[] enhanceableMethods

bridgeDelegates

private final java.util.Map<java.lang.reflect.Method,java.lang.reflect.Method> bridgeDelegates

Constructor Detail

EnhancerBuilderImpl

EnhancerBuilderImpl(java.lang.Class<?> hostClass,
                    java.util.Collection<java.lang.reflect.Method> enhanceableMethods,
                    java.util.Map<java.lang.reflect.Method,java.lang.reflect.Method> bridgeDelegates)

Method Detail

getEnhanceableMethods

public java.lang.reflect.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 java.util.function.Function<java.lang.String,java.util.function.BiFunction<java.lang.Object,java.lang.Object[],java.lang.Object>> buildEnhancer(java.util.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 java.util.function.Function<java.lang.String,java.util.function.BiFunction<java.lang.Object,java.lang.Object[],java.lang.Object>> doBuildEnhancer(java.util.BitSet methodIndices)