ParameterizedWrapper.java

/*
 * 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.parameter;

import java.util.List;

import org.jowidgets.util.Assert;
import org.jowidgets.util.IObservableValue;
import org.jowidgets.util.IObservableValueListener;
import org.jowidgets.util.ITypedKey;
import org.jowidgets.util.event.ChangeObservable;
import org.jowidgets.util.event.IChangeListener;
import org.jowidgets.util.event.IChangeObservable;

public class ParameterizedWrapper implements IParameterized, IChangeObservable {

    private final IParameterized original;
    private final ChangeObservable changeObservable;

    @SuppressWarnings("rawtypes")
    private IObservableValueListener observableValueListener;

    public ParameterizedWrapper(final IParameterized original) {
        Assert.paramNotNull(original, "original");
        this.original = original;
        this.changeObservable = new ChangeObservable();
    }

    protected IParameterized getOriginal() {
        return original;
    }

    @Override
    public void addChangeListener(final IChangeListener listener) {
        initChangeObservable();
        changeObservable.addChangeListener(listener);
    }

    @Override
    public void removeChangeListener(final IChangeListener listener) {
        changeObservable.removeChangeListener(listener);
    }

    @Override
    public final List<ITypedKey<?>> getAvailableParameters() {
        return original.getAvailableParameters();
    }

    @Override
    public final <VALUE_TYPE> IParameter<VALUE_TYPE> getParameter(final ITypedKey<VALUE_TYPE> key) {
        return original.getParameter(key);
    }

    public float getFloatValue(final ITypedKey<Float> key, final float defaultValue) {
        final Float value = getParameterMandatory(key).getValue();
        if (value != null) {
            return value.floatValue();
        }
        else {
            return defaultValue;
        }
    }

    public void setFloatValue(final ITypedKey<Float> key, final float value) {
        getParameterMandatory(key).setValue(Float.valueOf(value));
    }

    public int getIntValue(final ITypedKey<Integer> key, final int defaultValue) {
        final Integer value = getParameterMandatory(key).getValue();
        if (value != null) {
            return value.intValue();
        }
        else {
            return defaultValue;
        }
    }

    public void setIntValue(final ITypedKey<Integer> key, final int value) {
        getParameterMandatory(key).setValue(Integer.valueOf(value));
    }

    public boolean getBooleanValue(final ITypedKey<Boolean> key, final boolean defaultValue) {
        final Boolean value = getParameterMandatory(key).getValue();
        if (value != null) {
            return value.booleanValue();
        }
        else {
            return defaultValue;
        }
    }

    public void setBooleanValue(final ITypedKey<Boolean> key, final boolean value) {
        getParameterMandatory(key).setValue(Boolean.valueOf(value));
    }

    public final <VALUE_TYPE> IParameter<VALUE_TYPE> getParameterMandatory(final ITypedKey<VALUE_TYPE> key) {
        Assert.paramNotNull(key, "key");
        final IParameter<VALUE_TYPE> result = getParameter(key);
        if (result == null) {
            throw new IllegalArgumentException("No parameter for the key '" + key + "' defined");
        }
        return result;
    }

    @SuppressWarnings({"rawtypes"})
    private void initChangeObservable() {
        if (observableValueListener == null) {
            observableValueListener = new IObservableValueListener() {
                @Override
                public void changed(final IObservableValue observableValue, final Object value) {
                    changeObservable.fireChangedEvent();
                }
            };
            for (final ITypedKey<?> key : original.getAvailableParameters()) {
                original.getParameter(key).addValueListener(observableValueListener);
            }
        }
    }
}