JvmTypesResourceDescriptionStrategy.java 文件源码

protected Map<String, String> createLazyUserData(final EObject eObject) { 
    return new ForwardingMap<String, String>() {
        private Map<String,String> delegate; 

        @Override
        protected Map<String, String> delegate() {
            if(delegate == null) {
                Builder<String, String> userData = ImmutableMap.builder();
                createUserData(eObject, userData);
                delegate = userData.build();
            } 
            return delegate;
        }
    };
}