001    /**
002     * Implements the Cold Fusion Function arraymin
003     */
004    package railo.runtime.functions.arrays;
005    
006    import railo.runtime.PageContext;
007    import railo.runtime.exp.FunctionException;
008    import railo.runtime.exp.PageException;
009    import railo.runtime.ext.function.Function;
010    import railo.runtime.type.Array;
011    import railo.runtime.type.ArrayImpl;
012    
013    public final class ArraySlice implements Function {
014            
015            private static final long serialVersionUID = 7309769117464009924L;
016    
017            public static Array call(PageContext pc , Array arr,double offset) throws PageException {
018                    return call(pc , arr, offset,0);
019            }
020            public static Array call(PageContext pc , Array arr,double offset,double length) throws PageException {
021                                    
022                    int len=arr.size();
023                    if(offset>0) {
024                            if(len<offset)throw new FunctionException(pc,"arraySlice",2,"offset","offset cannot be greater than size of the array");
025                            
026                            int to=0;
027                            if(length>0)to=(int)(offset+length-1);
028                            else if(length<0)to=(int)(len+length);
029                            if(len<to)
030                                    throw new FunctionException(pc,"arraySlice",3,"length","offset+length cannot be greater than size of the array");
031                            
032                            return get(arr,(int)offset,to);
033                    }
034                    return call(pc ,arr,len+offset,length);
035            }
036            
037            private static Array get(Array arr, int from, int to) throws PageException {
038                    Array rtn=new ArrayImpl(arr.getDimension());
039                    int[] keys=arr.intKeys();
040                    for(int i=0;i<keys.length;i++) {
041                            int key=keys[i];
042                            if(key<from)continue;
043                            if(to>0 && key>to)break;
044                            rtn.append(arr.getE(key));
045                    }
046                    return rtn;
047            }
048            
049    }