/*
 * 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.zanata.model.validator;

import java.io.Serializable;
import java.net.MalformedURLException;
import java.net.URL;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class UrlValidator implements ConstraintValidator<Url, String>, Serializable
{
   private static final long serialVersionUID = 1L;

   private boolean canEndInSlash;

   @Override
   public void initialize(Url u)
   {
      this.canEndInSlash = u.canEndInSlash();
   }

   @Override
   public boolean isValid(String string, ConstraintValidatorContext context)
   {
      if (string == null)
      {
         return true;
      }
      if (!canEndInSlash && string.endsWith("/"))
      {
         return false;
      }

      try
      {
         new URL(string);
         return true;
      }
      catch (MalformedURLException e)
      {
         return false;
      }
   }

}

/*
 * 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.zanata.model.validator;

import java.io.Serializable;
import java.net.MalformedURLException;
import java.net.URL;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class UrlValidator implements ConstraintValidator<Url, String>, Serializable
{
   private static final long serialVersionUID = 1L;

   private boolean canEndInSlash;

   @Override
   public void initialize(Url u)
   {
      this.canEndInSlash = u.canEndInSlash();
   }

   @Override
   public boolean isValid(String string, ConstraintValidatorContext context)
   {
      if (string == null || string.isEmpty())
      {
         return true;
      }
      if (!canEndInSlash && string.endsWith("/"))
      {
         return false;
      }

      try
      {
         new URL(string);
         return true;
      }
      catch (MalformedURLException e)
      {
         return false;
      }
   }

}

Fix url validator to return valid with empty string