@Override
public void initialize(OperatorCompilingEnvironment env) {
Precondition.checkMustNotBeNull(env, "env"); //$NON-NLS-1$
this.environment = env;
TargetOperator target = getClass().getAnnotation(TargetOperator.class);
if (target != null) {
this.targetOperatorAnnotation = target.value();
} else {
env.getMessager().printMessage(
Diagnostic.Kind.WARNING,
MessageFormat.format(
"{0}に@{1}の指定がありません",