/*
* Copyright 2009 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.gradle.api.internal;
import org.gradle.internal.reflect.DirectInstantiator;
import org.gradle.internal.reflect.Instantiator;
import java.util.ArrayDeque;
import java.util.Deque;
/**
* @see org.gradle.api.internal.AsmBackedClassGenerator.MixInExtensibleDynamicObject#MixInExtensibleDynamicObject(Object, Class, org.gradle.internal.metaobject.DynamicObject)
* @see ClassGeneratorBackedInstantiator#newInstance(Class, Object...)
*/
public abstract class ThreadGlobalInstantiator {
private static final ThreadLocal<Deque<Instantiator>> STORAGE = new ThreadLocal<Deque<Instantiator>>() {
@Override
protected Deque<Instantiator> initialValue() {
return new ArrayDeque<Instantiator>();
}
};
private static Deque<Instantiator> getStack() {
return STORAGE.get();
}
public static Instantiator get() {
Deque<Instantiator> stack = getStack();
return stack.isEmpty() ? null : stack.peek();
}
public static void set(Instantiator instantiator) {
Deque<Instantiator> stack = getStack();
if (instantiator != null) {
stack.push(instantiator);
} else if (!stack.isEmpty()) {
stack.pop();
}
}
public static Instantiator getOrCreate() {
Instantiator instantiator = get();
if (instantiator != null) {
return instantiator;
} else {
return new ClassGeneratorBackedInstantiator(new AsmBackedClassGenerator(), DirectInstantiator.INSTANCE);
}
}
}