/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2010, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.msc.value;

/**
 * A value which returns the {@code Class} object of another value.
 *
 * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
 */
public final class ClassOfValue<T> implements Value<Class<? extends T>> {
    private final Value<? extends T> value;

    public ClassOfValue(final Value<? extends T> value) {
        this.value = value;
    }

    @SuppressWarnings({ "unchecked" })
    public Class<? extends T> getValue() throws IllegalStateException {
        final Value<? extends T> value = this.value;
        final T actualValue = value.getValue();
        return (Class<? extends T>) actualValue.getClass();
    }
}

/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2010, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.msc.value;

/**
 * A value which returns the {@code Class} object of another value.
 *
 * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
 */
public final class ClassOfValue<T> implements Value<Class<? extends T>> {
    private final Value<? extends T> value;

    public ClassOfValue(final Value<? extends T> value) {
        this.value = value;
    }

    /**
     * @return the {@code Class} of the value, or {@code null} if value.getValue() is {@code null}.
     */
    @SuppressWarnings({ "unchecked" })
    public Class<? extends T> getValue() throws IllegalStateException {
        final Value<? extends T> value = this.value;
        final T actualValue = value.getValue();
        return actualValue == null? null: (Class<? extends T>) actualValue.getClass();
    }
}

Tidy up API