Application: gvSIG desktop » Library: org.gvsig.tools

/*

 * gvSIG. Desktop Geographic Information System.

 * 

 * Copyright (C) 2007-2020 gvSIG Association.

 * 

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU 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 General Public License for more details.

 * 

 * You should have received a copy of the GNU General Public License 

 * along with this program. If not, see <https://www.gnu.org/licenses/>. 

 * 

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.tools.util;

import java.util.Collection;

import java.util.Map;

/**

 *

 * @author gvSIG Team

 */

public interface IsEmpty {

    public static boolean isEmpty(IsEmpty o) {

        return o==null || o.isEmpty();

    }

    public static boolean isEmpty(Object o) {

        if( o == null ) {

            return true;

        }

        if( o instanceof IsEmpty ) {

            return ((IsEmpty)o).isEmpty();

        }

        if( o instanceof Collection ) {

            return ((Collection)o).isEmpty();

        }

        if( o instanceof Map ) {

            return ((Map)o).isEmpty();

        }

        if( o instanceof String ) {

            return ((String)o).isEmpty();

        }

        if( o instanceof CharSequence ) {

            return ((CharSequence)o).length()==0;

        }

        throw new IllegalArgumentException("Object type not supported ("+o.getClass().getName()+").");

    }

    public boolean isEmpty();

    public static boolean isEmptyQuietly(IsEmpty x) {

        return x == null || x.isEmpty();

    }

}