/*
 * Copyright (c) 2011, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.spi.impl.controller;

import java.util.Collections;
import java.util.Set;

import org.jowidgets.common.types.Modifier;
import org.jowidgets.common.types.VirtualKey;
import org.jowidgets.common.widgets.controller.IKeyEvent;
import org.jowidgets.util.Assert;

public class KeyEvent implements IKeyEvent {

    private final ILazyKeyEventContentFactory contentFactory;

    private VirtualKey virtualKey;
    private Character character;
    private Character resultingCharacter;
    private Set<Modifier> modifier;

    private boolean virtualKeyInitialized;
    private boolean characterInitialized;
    private boolean resultingCharacterInitialized;
    private boolean modifierInitialized;

    public KeyEvent(final ILazyKeyEventContentFactory contentFactory) {
        Assert.paramNotNull(contentFactory, "contentFactory");
        this.contentFactory = contentFactory;

        this.virtualKeyInitialized = false;
        this.characterInitialized = false;
        this.resultingCharacterInitialized = false;
        this.modifierInitialized = false;
    }

    @Override
    public VirtualKey getVirtualKey() {
        if (!virtualKeyInitialized) {
            virtualKey = contentFactory.createVirtualKey();
            virtualKeyInitialized = true;
        }
        return virtualKey;
    }

    @Override
    public Character getCharacter() {
        if (!characterInitialized) {
            character = contentFactory.createCharacter();
            characterInitialized = true;
        }
        return character;
    }

    @Override
    public Character getResultingCharacter() {
        if (!resultingCharacterInitialized) {
            resultingCharacter = contentFactory.createResultingCharacter();
            resultingCharacterInitialized = true;
        }
        return resultingCharacter;
    }

    @Override
    public Set<Modifier> getModifier() {
        if (!modifierInitialized) {
            final Set<Modifier> createdModifier = contentFactory.createModifier();
            if (createdModifier != null) {
                modifier = Collections.unmodifiableSet(contentFactory.createModifier());
            }
            else {
                modifier = Collections.emptySet();
            }
            modifierInitialized = true;
        }
        return modifier;
    }

    @Override
    public String toString() {
        return "LazyKeyEvent [virtualKey="
            + getVirtualKey()
            + ", character="
            + getCharacter()
            + ", resultingCharacter="
            + getResultingCharacter()
            + ", modifier="
            + getModifier()
            + "]";
    }

}