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 **/
019/**
020 * Implements the CFML Function arraymin
021 */
022package lucee.runtime.functions.arrays;
023
024import lucee.runtime.PageContext;
025import lucee.runtime.exp.FunctionException;
026import lucee.runtime.exp.PageException;
027import lucee.runtime.functions.BIF;
028import lucee.runtime.op.Caster;
029import lucee.runtime.type.Array;
030import lucee.runtime.type.ArrayImpl;
031
032public final class ArraySlice extends BIF {
033        
034        private static final long serialVersionUID = 7309769117464009924L;
035
036        public static Array call(PageContext pc , Array arr,double offset) throws PageException {
037                return call(pc , arr, offset,0);
038        }
039        public static Array call(PageContext pc , Array arr,double offset,double length) throws PageException {
040                                
041                int len=arr.size();
042                if(offset>0) {
043                        if(len<offset)throw new FunctionException(pc,"arraySlice",2,"offset","Offset cannot be greater than size of the array");
044                        
045                        int to=0;
046                        if(length>0)to=(int)(offset+length-1);
047                        else if(length<0)to=(int)(len+length);
048                        if(len<to)
049                                throw new FunctionException(pc,"arraySlice",3,"length","Offset+length cannot be greater than size of the array");
050                        
051                        return get(arr,(int)offset,to);
052                }
053                return call(pc ,arr,len+offset,length);
054        }
055        
056        @Override
057        public Object invoke(PageContext pc, Object[] args) throws PageException {
058                if(args.length==2)return call(pc,Caster.toArray(args[0]),Caster.toDoubleValue(args[1]));
059                return call(pc,Caster.toArray(args[0]),Caster.toDoubleValue(args[1]),Caster.toDoubleValue(args[2]));
060        }
061        
062        private static Array get(Array arr, int from, int to) throws PageException {
063                Array rtn=new ArrayImpl(arr.getDimension());
064                int[] keys=arr.intKeys();
065                for(int i=0;i<keys.length;i++) {
066                        int key=keys[i];
067                        if(key<from)continue;
068                        if(to>0 && key>to)break;
069                        rtn.append(arr.getE(key));
070                }
071                return rtn;
072        }
073        
074}