AbstractObservableBooleanComposite.java example

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 * Copyright (c) 2014, grossmann
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package org.jowidgets.util;

import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

abstract class AbstractObservableBooleanComposite extends AbstractObservableValue<Boolean> implements IObservableValue<Boolean> {

    private final Set<IObservableValue<Boolean>> originals;

    AbstractObservableBooleanComposite(final IObservableValue<Boolean>... originals) {
        this(Arrays.asList(originals));
    }

    AbstractObservableBooleanComposite(final Collection<IObservableValue<Boolean>> originals) {
        Assert.paramNotNull(originals, "originals");
        this.originals = new HashSet<IObservableValue<Boolean>>(originals);

        for (final IObservableValue<Boolean> original : originals) {
            original.addValueListener(new IObservableValueListener<Boolean>() {
                @Override
                public void changed(final IObservableValue<Boolean> observableValue, final Boolean value) {
                    fireValueChanged();
                }
            });
        }
    }

    abstract boolean getValue(Collection<IObservableValue<Boolean>> originals);

    @Override
    public final void setValue(final Boolean value) {
        throw new UnsupportedOperationException("The value is readonly");
    }

    @Override
    public final Boolean getValue() {
        if (originals.isEmpty()) {
            return Boolean.FALSE;
        }
        return Boolean.valueOf(getValue(originals));
    }

    /**
     * @return The value as a elemental boolean type
     */
    public final boolean get() {
        return getValue().booleanValue();
    }

}