/*
 * Copyright (c) 2013, 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.util.concurrent;

import org.jowidgets.util.Assert;
import org.jowidgets.util.IObservableValueListener;
import org.jowidgets.util.parameter.IParameter;
import org.jowidgets.util.parameter.ParameterWrapper;

public final class SingleThreadParameter<VALUE_TYPE> extends ParameterWrapper<VALUE_TYPE> implements IParameter<VALUE_TYPE> {

    private final IParameter<VALUE_TYPE> original;

    private final ISingleThreadAccess readThreadAccess;
    private final ISingleThreadAccess writeThreadAccess;

    public SingleThreadParameter(final IParameter<VALUE_TYPE> original, final ISingleThreadAccess singleThreadAccess) {
        this(original, singleThreadAccess, singleThreadAccess);
    }

    public SingleThreadParameter(
        final IParameter<VALUE_TYPE> original,
        final ISingleThreadAccess readThreadAccess,
        final ISingleThreadAccess writeThreadAccess) {

        super(original);
        Assert.paramNotNull(original, "original");

        this.original = original;
        this.readThreadAccess = readThreadAccess;
        this.writeThreadAccess = writeThreadAccess;
    }

    @Override
    public void setValue(final VALUE_TYPE value) {
        checkWriteThread();
        original.setValue(value);
    }

    @Override
    public VALUE_TYPE getValue() {
        checkReadThread();
        return original.getValue();
    }

    @Override
    public void addValueListener(final IObservableValueListener<?> listener) {
        checkWriteThread();
        original.addValueListener(listener);
    }

    @Override
    public void removeValueListener(final IObservableValueListener<?> listener) {
        checkWriteThread();
        original.removeValueListener(listener);
    }

    private void checkReadThread() {
        if (readThreadAccess != null) {
            if (!readThreadAccess.isSingleThread()) {
                throw new IllegalArgumentException("Operation must be invoked in read thread access!");
            }
        }
    }

    private void checkWriteThread() {
        if (writeThreadAccess != null) {
            if (!writeThreadAccess.isSingleThread()) {
                throw new IllegalArgumentException("Operation must be invoked in write thread access!");
            }
        }
    }

}