001/** 002 * 003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved. 004 * 005 * This library is free software; you can redistribute it and/or 006 * modify it under the terms of the GNU Lesser General Public 007 * License as published by the Free Software Foundation; either 008 * version 2.1 of the License, or (at your option) any later version. 009 * 010 * This library is distributed in the hope that it will be useful, 011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 * Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public 016 * License along with this library. If not, see <http://www.gnu.org/licenses/>. 017 * 018 **/ 019package lucee.runtime.type.comparator; 020 021import java.util.Comparator; 022 023import lucee.runtime.exp.ExpressionException; 024import lucee.runtime.exp.PageException; 025import lucee.runtime.exp.PageRuntimeException; 026import lucee.runtime.op.Caster; 027 028 029/** 030 * comparator implementation, compare to numbers 031 */ 032public final class NumberComparator implements Comparator { 033 034 private boolean isAsc; 035 036 /** 037 * constructor of the class 038 * @param isAsc is ascendinf or descending 039 */ 040 public NumberComparator(boolean isAsc) { 041 this.isAsc=isAsc; 042 } 043 044 @Override 045 public int compare(Object oLeft, Object oRight) { 046 try { 047 if(isAsc) return compareObjects(oLeft, oRight); 048 return compareObjects(oRight, oLeft); 049 } catch (PageException e) { 050 throw new PageRuntimeException(new ExpressionException("can only sort arrays with simple values",e.getMessage())); 051 } 052 } 053 054 private int compareObjects(Object oLeft, Object oRight) throws PageException { 055 double left=Caster.toDoubleValue(oLeft); 056 double right=Caster.toDoubleValue(oRight); 057 if(left < right)return -1; 058 return left > right ? 1 : 0; 059 060 } 061}