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.ArrayList;

import java.util.Collections;

import java.util.Iterator;

import java.util.List;

/**

 *

 * @author gvSIG Team

 */

public class IterableBuilder<T> {

    public List<T> l;

    public Iterator<T> it;

    public IterableBuilder() {

        this.l = null;

        this.it = null;

    }

    public IterableBuilder(Iterator<T> iterator) {

        this.l = null;

        this.it = iterator;

    }

    public IterableBuilder add(Iterator<T> iterator) {

        this.it = iterator;

        return this;

    }

    public IterableBuilder add(T value) {

        if( this.l==null ) {

            this.l = new ArrayList<>();    

        }

        this.l.add(value);

        return this;

    }

    public Iterable<T> build(Iterator<T> it) {

        return () -> it;

    }

    public Iterable<T> build() {

        if( this.l!=null ) {

            return this.l;

        }

        if( this.it!=null ) {

            return () -> it;

        }

        return Collections.EMPTY_LIST;

    }

}