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/*
 * Copyright (C) 2023 Parisi Alessandro - [email protected]
 * This file is part of MaterialFX (https://github.com/palexdev/MaterialFX)
 *
 * MaterialFX is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3 of the License,
 * or (at your option) any later version.
 *
 * MaterialFX is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with MaterialFX. If not, see .
 */

package io.github.palexdev.mfxcore.observables;

import javafx.beans.InvalidationListener;
import javafx.beans.value.ObservableValue;

import java.lang.ref.WeakReference;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;

public class OnInvalidated extends When {
    //================================================================================
    // Properties
    //================================================================================
    protected InvalidationListener listener;
    private Consumer action;
    private BiConsumer>, T> otherwise = (w, t) -> {};
    private Function condition = t -> true;

    //================================================================================
    // Constructors
    //================================================================================
    public OnInvalidated(ObservableValue observable) {
        super(observable);
    }

    /**
     * Build a "wrapping" {@code OnInvalidated} construct for the given observable and {@link InvalidationListener}.
     * 

* This should be used specifically when several listeners will execute the same action. To improve performance and * memory usage, you can build the listener yourself and create the construct with this. *

* Automatically active upon creation! *

* Note however that this special construct will not have any of its features working (no action, no condition, * no otherwise, etc.) because the listener is not built but the construct, of course. */ public static OnInvalidated withListener(ObservableValue observable, InvalidationListener il) { return new OnInvalidated<>(observable) { { listener = il; register(); observable.addListener(listener); } }; } //================================================================================ // Methods //================================================================================ public OnInvalidated then(Consumer action) { this.action = action; return this; } public OnInvalidated otherwise(BiConsumer>, T> otherwise) { this.otherwise = otherwise; return this; } public OnInvalidated condition(Function condition) { this.condition = condition; return this; } public OnInvalidated executeNow() { action.accept(observable.getValue()); if (oneShot && execNowOneShot) dispose(); return this; } //================================================================================ // Overridden Methods //================================================================================ @Override public When listen() { // This may happen if executeNow() was executed and this was set to be oneShot // for the executeNow methods too // If listener is not null, then this was already registered before and not disposed, exit! if (isDisposed() || listener != null) return this; if (oneShot) { listener = i -> { T val = observable.getValue(); if (condition.apply(val)) { action.accept(val); dispose(); } else { otherwise.accept(asWeak(), val); } }; } else { listener = i -> { T val = observable.getValue(); if (condition.apply(val)) { action.accept(val); } else { otherwise.accept(asWeak(), val); } }; } register(); observable.addListener(listener); return this; } @Override protected When invalidate() { T val = observable.getValue(); if (condition.apply(val)) action.accept(val); return this; } @Override public void dispose() { super.dispose(); if (observable != null) { if (listener != null) { observable.removeListener(listener); listener = null; } handleMapDisposal(); observable = null; } } }




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