001    /**
002     * Implements the CFML 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.functions.BIF;
010    import railo.runtime.op.Caster;
011    import railo.runtime.type.Array;
012    import railo.runtime.type.ArrayImpl;
013    
014    public final class ArraySlice extends BIF {
015            
016            private static final long serialVersionUID = 7309769117464009924L;
017    
018            public static Array call(PageContext pc , Array arr,double offset) throws PageException {
019                    return call(pc , arr, offset,0);
020            }
021            public static Array call(PageContext pc , Array arr,double offset,double length) throws PageException {
022                                    
023                    int len=arr.size();
024                    if(offset>0) {
025                            if(len<offset)throw new FunctionException(pc,"arraySlice",2,"offset","Offset cannot be greater than size of the array");
026                            
027                            int to=0;
028                            if(length>0)to=(int)(offset+length-1);
029                            else if(length<0)to=(int)(len+length);
030                            if(len<to)
031                                    throw new FunctionException(pc,"arraySlice",3,"length","Offset+length cannot be greater than size of the array");
032                            
033                            return get(arr,(int)offset,to);
034                    }
035                    return call(pc ,arr,len+offset,length);
036            }
037            
038            @Override
039            public Object invoke(PageContext pc, Object[] args) throws PageException {
040                    if(args.length==2)return call(pc,Caster.toArray(args[0]),Caster.toDoubleValue(args[1]));
041                    return call(pc,Caster.toArray(args[0]),Caster.toDoubleValue(args[1]),Caster.toDoubleValue(args[2]));
042            }
043            
044            private static Array get(Array arr, int from, int to) throws PageException {
045                    Array rtn=new ArrayImpl(arr.getDimension());
046                    int[] keys=arr.intKeys();
047                    for(int i=0;i<keys.length;i++) {
048                            int key=keys[i];
049                            if(key<from)continue;
050                            if(to>0 && key>to)break;
051                            rtn.append(arr.getE(key));
052                    }
053                    return rtn;
054            }
055            
056    }