PopupDetectionObservable.java example

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/*
 * Copyright (c) 2010, grossmann
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package org.jowidgets.spi.impl.controller;

import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.Set;

import org.jowidgets.common.types.Position;
import org.jowidgets.common.widgets.controller.IPopupDetectionListener;
import org.jowidgets.common.widgets.controller.IPopupDetectionObservable;
import org.jowidgets.util.Assert;

public class PopupDetectionObservable implements IPopupDetectionObservable {

    private final Set<IPopupDetectionListener> listeners;

    public PopupDetectionObservable() {
        super();
        this.listeners = new LinkedHashSet<IPopupDetectionListener>();
    }

    @Override
    public void addPopupDetectionListener(final IPopupDetectionListener listener) {
        Assert.paramNotNull(listener, "listener");
        listeners.add(listener);
    }

    @Override
    public void removePopupDetectionListener(final IPopupDetectionListener listener) {
        Assert.paramNotNull(listener, "listener");
        listeners.remove(listener);
    }

    public void firePopupDetected(final Position position) {
        for (final IPopupDetectionListener listener : new LinkedList<IPopupDetectionListener>(listeners)) {
            listener.popupDetected(position);
        }
    }

}