Groovy Documentation

## org.codehaus.groovy.runtime
[Java] Class ProxyGeneratorAdapter

    java.lang.Object
      org.objectweb.asm.ClassVisitor
          org.codehaus.groovy.runtime.ProxyGeneratorAdapter

All Implemented Interfaces:
  org.objectweb.asm.Opcodes

    public class ProxyGeneratorAdapter
    extends org.objectweb.asm.ClassVisitor

A proxy generator responsible for mapping a map of closures to a class implementing a list of interfaces. For example, the following code:

         abstract class Foo {
             abstract void bar();
             abstract void baz();
         }
         def dyn = [bar: { println 'hello' }, baz: { println 'world'}] as Foo

will generate a proxy class which extends class Foo and delegates method calls to the provided closures. The generated proxy implements the GroovyObject interface. Additionaly, this proxy generator supports delegation to another object. In that case, if a method is defined both in the closure map and the delegate, the version from the map is preferred. This allows overriding methods from delegates with ease. Internally, the proxy generator makes use of ASM to generate bytecode, for improved performance as compared to the legacy proxy generation mechanism which made use of string templates.

Authors:
  Cedric Champeau

Since:
  2.0.0

Constructor Summary
`ProxyGeneratorAdapter(java.util.Map closureMap, java.lang.Class superClass, java.lang.Class[] interfaces, java.lang.ClassLoader proxyLoader, boolean emptyBody, java.lang.Class delegateClass)` Construct a proxy generator.

Method Summary
`GroovyObject` | `delegatingProxy(java.lang.Object delegate, java.util.Map map, java.lang.Object... constructorArgs)`
`static Closure` | `ensureClosure(java.lang.Object o)`
`protected org.objectweb.asm.MethodVisitor` | `makeDelegateCall(java.lang.String name, java.lang.String desc, java.lang.String signature, java.lang.String[] exceptions, int accessFlags)`
`protected org.objectweb.asm.MethodVisitor` | `makeDelegateToClosureCall(java.lang.String name, java.lang.String desc, java.lang.String signature, java.lang.String[] exceptions, int accessFlags)`
`GroovyObject` | `proxy(java.util.Map map, java.lang.Object... constructorArgs)`
`void` | `visit(int version, int access, java.lang.String name, java.lang.String signature, java.lang.String superName, java.lang.String[] interfaces)`
`org.objectweb.asm.MethodVisitor` | `visitMethod(int access, java.lang.String name, java.lang.String desc, java.lang.String signature, java.lang.String[] exceptions)`

Methods inherited from class org.objectweb.asm.ClassVisitor

org.objectweb.asm.ClassVisitor#visit(int, int, java.lang.String, java.lang.String, java.lang.String, [Ljava.lang.String;), org.objectweb.asm.ClassVisitor#visitMethod(int, java.lang.String, java.lang.String, java.lang.String, [Ljava.lang.String;), org.objectweb.asm.ClassVisitor#visitAnnotation(java.lang.String, boolean), org.objectweb.asm.ClassVisitor#visitEnd(), org.objectweb.asm.ClassVisitor#visitField(int, java.lang.String, java.lang.String, java.lang.String, java.lang.Object), org.objectweb.asm.ClassVisitor#visitAttribute(org.objectweb.asm.Attribute), org.objectweb.asm.ClassVisitor#visitInnerClass(java.lang.String, java.lang.String, java.lang.String, int), org.objectweb.asm.ClassVisitor#visitOuterClass(java.lang.String, java.lang.String, java.lang.String), org.objectweb.asm.ClassVisitor#visitSource(java.lang.String, java.lang.String), org.objectweb.asm.ClassVisitor#wait(long), org.objectweb.asm.ClassVisitor#wait(long, int), org.objectweb.asm.ClassVisitor#wait(), org.objectweb.asm.ClassVisitor#equals(java.lang.Object), org.objectweb.asm.ClassVisitor#toString(), org.objectweb.asm.ClassVisitor#hashCode(), org.objectweb.asm.ClassVisitor#getClass(), org.objectweb.asm.ClassVisitor#notify(), org.objectweb.asm.ClassVisitor#notifyAll()

Methods inherited from class java.lang.Object
java.lang.Object#wait(long), java.lang.Object#wait(long, int), java.lang.Object#wait(), java.lang.Object#equals(java.lang.Object), java.lang.Object#toString(), java.lang.Object#hashCode(), java.lang.Object#getClass(), java.lang.Object#notify(), java.lang.Object#notifyAll()

Constructor Detail

### ProxyGeneratorAdapter

    public ProxyGeneratorAdapter(java.util.Map closureMap, java.lang.Class superClass, java.lang.Class[] interfaces, java.lang.ClassLoader proxyLoader, boolean emptyBody, java.lang.Class delegateClass)

  Construct a proxy generator. This generator is used when we need to create a proxy object for a class or an interface given a map of closures.
  Parameters:
    `closureMap` - the delegates implementations
    `superClass` - corresponding to the superclass class visitor
    `interfaces` - extra interfaces the proxy should implement
    `proxyLoader` - the class loader which should be used to load the generated proxy
    `delegateClass` - if not null, generate a delegate field with the corresponding class
    `emptyBody` - if set to true, the unimplemented abstract methods will receive an empty body instead of throwing an java.lang.UnsupportedOperationException.

Method Detail

### delegatingProxy

    || arg == Type.BYTE_TYPE
    public GroovyObject delegatingProxy(java.lang.Object delegate, java.util.Map map, java.lang.Object... constructorArgs)

### ensureClosure

    }
    public static Closure ensureClosure(java.lang.Object o)

### makeDelegateCall

    protected org.objectweb.asm.MethodVisitor makeDelegateCall(java.lang.String name, java.lang.String desc, java.lang.String signature, java.lang.String[] exceptions, int accessFlags)

### makeDelegateToClosureCall

    protected org.objectweb.asm.MethodVisitor makeDelegateToClosureCall(java.lang.String name, java.lang.String desc, java.lang.String signature, java.lang.String[] exceptions, int accessFlags)

### proxy

    if (type == Type.DOUBLE_TYPE) return DLOAD;
    public GroovyObject proxy(java.util.Map map, java.lang.Object... constructorArgs)

### visit

    if (addGroovyObjectSupport) {
    public void visit(int version, int access, java.lang.String name, java.lang.String signature, java.lang.String superName, java.lang.String[] interfaces)

### visitMethod

    return makeDelegateCall(name, desc,  signature, exceptions, accessFlags);
    public org.objectweb.asm.MethodVisitor visitMethod(int access, java.lang.String name, java.lang.String desc, java.lang.String signature, java.lang.String[] exceptions)

Groovy Documentation