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View component for functional reactive programming with JavaFX

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package com.netopyr.reduxfx.vscenegraph.javafx;

import javafx.scene.control.TreeItem;

import java.util.HashMap;
import java.util.Map;

public class TreeItemWrapper extends TreeItem {

    private Map properties;

    public final Map getProperties() {
        if (properties == null) {
            properties = new HashMap<>();
        }
        return properties;
    }
}