/*
 * Copyright (c) 2014, 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.impl.clipboard;

import org.jowidgets.api.clipboard.IClipboard;
import org.jowidgets.api.clipboard.IClipboardListener;
import org.jowidgets.api.clipboard.ITransferable;
import org.jowidgets.api.clipboard.TransferType;
import org.jowidgets.api.threads.IUiThreadAccess;
import org.jowidgets.api.toolkit.Toolkit;
import org.jowidgets.spi.clipboard.IClipboardListenerSpi;
import org.jowidgets.spi.clipboard.IClipboardSpi;
import org.jowidgets.spi.clipboard.ITransferableSpi;
import org.jowidgets.util.Assert;
import org.jowidgets.util.event.IObservableCallback;

public final class ClipbaordImpl implements IClipboard {

    private final IClipboardSpi clipboardSpi;
    private final IClipboardListenerSpi clipboardListenerSpi;
    private final ClipboardObservable clipboardObservable;

    private final IUiThreadAccess uiThreadAccess;

    public ClipbaordImpl(final IClipboardSpi clipboard) {
        Assert.paramNotNull(clipboard, "clipboard");

        this.clipboardSpi = clipboard;

        this.clipboardListenerSpi = new IClipboardListenerSpi() {
            @Override
            public void clipboardChanged() {
                clipboardObservable.fireClipboardChanged();
            }
        };

        final IObservableCallback observableCallback = new IObservableCallback() {

            @Override
            public void onFirstRegistered() {
                clipboardSpi.addClipboardListener(clipboardListenerSpi);
            }

            @Override
            public void onLastUnregistered() {
                clipboardSpi.removeClipboardListener(clipboardListenerSpi);
            }
        };

        this.clipboardObservable = new ClipboardObservable(observableCallback);

        this.uiThreadAccess = Toolkit.getUiThreadAccess();
    }

    @Override
    public void setContents(final ITransferable contents) {
        if (contents != null) {
            clipboardSpi.setContents(new TransferableSpiAdapter(contents));
        }
        else {
            clipboardSpi.setContents(null);
        }
    }

    @Override
    public ITransferable getContents() {
        final ITransferableSpi contents = clipboardSpi.getContents();
        if (contents != null) {
            return new TransferableAdapter(contents);
        }
        else {
            return null;
        }
    }

    @Override
    public <JAVA_TYPE> JAVA_TYPE getData(final TransferType<JAVA_TYPE> type) {
        final ITransferable content = getContents();
        if (content != null) {
            if (content.getSupportedTypes().contains(type)) {
                return content.getData(type);
            }
        }
        return null;
    }

    @Override
    public void addClipboardListener(final IClipboardListener listener) {
        clipboardObservable.addClipboardListener(listener);
    }

    @Override
    public void removeClipboardListener(final IClipboardListener listener) {
        clipboardObservable.removeClipboardListener(listener);
    }

    @Override
    public void dispose() {
        checkThread();
        clipboardSpi.removeClipboardListener(clipboardListenerSpi);
    }

    private void checkThread() {
        if (!uiThreadAccess.isUiThread()) {
            throw new IllegalStateException("The clipboard must be accessed in the ui thread");
        }
    }

}