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Runtime Library for KlumAST
There is a newer version: 2.0.0-rc.39
/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015-2024 Stephan Pauxberger
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.blackbuild.klum.ast.process;

import org.jetbrains.annotations.NotNull;

import java.util.*;

public class PhaseDriver {

    private static final ThreadLocal instance = new ThreadLocal<>();

    @NotNull
    public static PhaseDriver getInstance() {
        if (instance.get() == null)
            instance.set(new PhaseDriver());
        return instance.get();
    }

    private final NavigableSet phaseActions = new TreeSet<>(Comparator.comparingInt(PhaseAction::getPhase));

    private Object rootObject;
    private int activeObjectPointer = 0;

    private PhaseAction currentPhase;

    public PhaseDriver() {
        ServiceLoader.load(PhaseAction.class).forEach(phaseActions::add);
    }

    public void addPhase(PhaseAction action) {
        phaseActions.add(action);
    }

    public static void enter(Object object) {
        PhaseDriver driver = getInstance();
        if (driver.activeObjectPointer == 0)
            driver.rootObject = object;
        driver.activeObjectPointer++;
    }

    public static void leave() {
        PhaseDriver driver = getInstance();
        driver.activeObjectPointer--;
    }

    public static void cleanup() {
        if (getInstance().activeObjectPointer == 0)
            instance.remove();
    }

    public int getCurrentPhase() {
        return currentPhase.getPhase();
    }

    public static void executeIfReady() {
        PhaseDriver phaseDriver = getInstance();
        if (phaseDriver.activeObjectPointer != 1) return;
        for (PhaseAction a : phaseDriver.phaseActions) {
            phaseDriver.currentPhase = a;
            a.execute();
        }
    }

    public Object getRootObject() {
        return rootObject;
    }
}