/* * Copyright (C) 2010 Teleal GmbH, Switzerland * * This program 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 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program.  If not, see <http://www.gnu.org/licenses/>. */package org.teleal.cling.support.model;import java.util.ArrayList;import java.util.List;/** * @author Christian Bauer */public class SortCriterion {    final protected boolean ascending;    final protected String propertyName;    public SortCriterion(boolean ascending, String propertyName) {        this.ascending = ascending;        this.propertyName = propertyName;    }    public SortCriterion(String criterion) {        this(criterion.startsWith("+"), criterion.substring(1));        if (!(criterion.startsWith("-") || criterion.startsWith("+")))            throw new IllegalArgumentException("Missing sort prefix +/- on criterion: " + criterion);    }    public boolean isAscending() {        return ascending;    }    public String getPropertyName() {        return propertyName;    }    public static SortCriterion[] valueOf(String s) {        if (s == null || s.length() == 0) return new SortCriterion[0];        List<SortCriterion> list = new ArrayList();        String[] criteria = s.split(",");        for (String criterion : criteria) {            list.add(new SortCriterion(criterion.trim()));        }        return list.toArray(new SortCriterion[list.size()]);    }    public static String toString(SortCriterion[] criteria) {        if (criteria == null) return "";        StringBuilder sb = new StringBuilder();        for (SortCriterion sortCriterion : criteria) {            sb.append(sortCriterion.toString()).append(",");        }        if (sb.toString().endsWith(",")) sb.deleteCharAt(sb.length()-1);        return sb.toString();    }    @Override    public String toString() {        StringBuilder sb = new StringBuilder();        sb.append(ascending ? "+" : "-");        sb.append(propertyName);        return sb.toString();    }}