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Weld runtime packaged as an OSGi bundle

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.jboss.weld.injection;

import org.jboss.weld.bootstrap.api.Service;

import javax.enterprise.inject.spi.InjectionPoint;
import java.util.EmptyStackException;
import java.util.Stack;

public class CurrentInjectionPoint implements Service {

    private final ThreadLocal> currentInjectionPoint;

    public CurrentInjectionPoint() {
        this.currentInjectionPoint = new ThreadLocal>();
    }

    /**
     * Replaces (or adds) the current injection point. If a current injection
     * point exists, it will be replaced. If no current injection point exists,
     * one will be added.
     *
     * @param injectionPoint the injection point to use
     * @return the injection point added, or null if previous existed did not exist
     */
    public void push(InjectionPoint injectionPoint) {
        Stack stack = currentInjectionPoint.get();
        if (stack == null) {
            stack = new Stack();
            currentInjectionPoint.set(stack);
        }
        stack.push(injectionPoint);
    }

    public InjectionPoint pop() {
        Stack stack = currentInjectionPoint.get();
        if (stack == null) {
            throw new EmptyStackException();
        }
        try {
            return stack.pop();
        } finally {
            if (stack.isEmpty()) {
                currentInjectionPoint.remove();
            }
        }
    }

    /**
     * The injection point being operated on for this thread
     *
     * @return the current injection point
     */
    public InjectionPoint peek() {
        Stack stack = currentInjectionPoint.get();
        if (stack == null) {
            return null;
        }
        if (!stack.empty()) {
            return stack.peek();
        } else {
            return null;
        }
    }

    public void cleanup() {

    }

}