tapestry.Constraints.java Source code

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Here is the source code for tapestry.Constraints.java

Source

/**
 * //
 * //    Tapestry- a really-really fast event driven distributed hash table
 * //
 * //    Copyright (C) 2006 Jorge M. Faleiro Jr.
 * //
 * //    This program is free software: you can redistribute it and/or modify
 * //    it under the terms of the GNU Affero General Public License as published
 * //    by the Free Software Foundation, either version 3 of the License, or
 * //    (at your option) any later version.
 * //
 * //    This program 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 Affero General Public License for more details.
 * //
 * //    You should have received a copy of the GNU Affero General Public License
 * //    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * //
 */
package tapestry;

import com.google.common.base.Preconditions;

/**
 * Constraint utilities.
 * 
 * @author jfaleiro
 *
 */
public class Constraints {

    /**
     * Constraint exception when flag is <code>true</code>.
     * 
     * @param flag
     *            boolean flag to be checked
     * @param message
     *            description of constraint
     */
    public static final void constrain(boolean flag, String message) {
        try {
            Preconditions.checkArgument(flag, message);
        } catch (IllegalArgumentException e) {
            throw new ConstraintException(e);
        }
    }

}