SequenceIterator

SequenceIterator 用于遍历序列字段。请注意，迭代是以分块模式进行的，也就是说，每次迭代会获取多个序列项。

您可以使用 tileItems() 方法获取当前瓦片中的所有项目。主要的迭代方法是 nextTile()，它会将迭代器定位到下一个瓦片。瓦片的大小取决于具体实现，默认情况下为 100 个项目，但在序列末尾时，瓦片可能会包含更少的项目。

另一种迭代方式是使用 get() 方法。此方法会将项目提取到您提供的数组中。如果您希望逐项（标量模式）进行迭代，可以传递一个大小为 1 的数组给 get() 方法。

类定义

    public  class SequenceIterator implements java.io.Closeable
    {
        long handle;
         
        SequenceIterator(long hnd) 
        {
            handle = hnd;
        }
         
        // Iterator Methods
        public int get(Object buffer)  {…};
           public Object next()  {…};
        public int nextInt()  {…};
        public long nextLong()  {…};
        public float nextFloat()  {…};
        public byte[] nextBytes()  {…};
        public String nextString()  {…};
        public Date nextDate()  {…};
        public long firstPosition()  {…};
        public long lastPosition()  {…};
        public long nextPosition()  {…};
        public boolean nextTile()  {…};
        public int elemSize()  {…};
        public Object tileItems()  {…};
        
        public Sequence.Type type()  {…};
        static native public boolean isRLE()  {…};
        public int itemRepeatCount(int i)  {…};
        public SequenceIterator rleDecode()  {…};
        public void reset()  {…};
        
        public void close()  {…};
        
         
        // Top Operations
        public SequenceIterator topMax(int top)   {…};
        public SequenceIterator topMin(int top)   {…};
        public SequenceIterator topPosMax(int top)   {…};
        public SequenceIterator topPosMin(int top)   {…};
         
        // Unary Operations
        public SequenceIterator abs()  {…};
        public SequenceIterator neq()   {…};
        public SequenceIterator match(String pattern)  {…};
         
        // Binary Operations
        public SequenceIterator add(SequenceIterator other)  {…};
        public SequenceIterator sub(SequenceIterator other)  {…};
        public SequenceIterator div(SequenceIterator other)  {…};
        public SequenceIterator mul(SequenceIterator other)  {…};
        public SequenceIterator mod(SequenceIterator other)  {…};
        public SequenceIterator max(SequenceIterator other)  {…};
        public SequenceIterator min(SequenceIterator other)  {…};
         
        // Comparison_Operators
        public SequenceIterator eq(SequenceIterator other)  {…};
        public SequenceIterator ne(SequenceIterator other)  {…};
        public SequenceIterator lt(SequenceIterator other)  {…};
        public SequenceIterator gt(SequenceIterator other)  {…};
        public SequenceIterator le(SequenceIterator other)  {…};
        public SequenceIterator ge(SequenceIterator other)  {…};
         
        // Logical Operators
        public SequenceIterator and(SequenceIterator other)  {…};
        public SequenceIterator or(SequenceIterator other)  {…};
        public SequenceIterator xor(SequenceIterator other)  {…};
        public SequenceIterator not()  {…};
         
        // Collapse Operations
        public SequenceIterator wsum(SequenceIterator weights)  {…};
        public SequenceIterator wavg(SequenceIterator weights)  {…};
        public SequenceIterator cov(SequenceIterator other)  {…};
        public SequenceIterator corr(SequenceIterator other)  {…};
         
        // Conditional Operations
        public SequenceIterator iif(SequenceIterator then, 
            SequenceIterator otherwise, boolean lazy)   {…};
        public SequenceIterator filter(SequenceIterator cond)   {…};
        public SequenceIterator filterPos()   {…};
         
        // Grand Aggregate
        public SequenceIterator aggCount()   {…};
        
        public SequenceIterator aggMax()   {…};
        
        public SequenceIterator aggMin()   {…};
        
        public SequenceIterator aggSum()   {…};
        
        public SequenceIterator aggPrd()   {…};
        
        public SequenceIterator aggAvg()   {…};
        
        public SequenceIterator aggVar()   {…};
        public SequenceIterator aggDev()   {…};
        public SequenceIterator aggVarSamp()   {…};
        public SequenceIterator aggDevSamp()   {…};
        public SequenceIterator aggApproxDC()   {…};
        public SequenceIterator aggApproxHashDC()   {…};
        public SequenceIterator aggMinMax()   {…};
         
        // Group-By Aggregate
        public SequenceIterator groupAggWavg(SequenceIterator weight, SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggMax(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggMin(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggSum(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggAvg(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggVar(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggDev(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggVarSamp(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggDevSamp(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggFirst(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggLast(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggCount()   {…};
        public SequenceIterator groupAggApproxDC(SequenceIterator groupBy)   {…};
        public SequenceIterator groupAggApproxHashDC(SequenceIterator groupBy)   {…};
         
        // Grid Aggregate
        public SequenceIterator gridAggMax(int interval)   {…};
        public SequenceIterator gridAggMin(int interval)   {…};
        public SequenceIterator gridAggSum(int interval)   {…};
        public SequenceIterator gridAggAvg(int interval)   {…};
        public SequenceIterator gridAggVar(int interval)   {…};
        public SequenceIterator gridAggDev(int interval)   {…};
        public SequenceIterator gridAggVarSamp(int interval)   {…};
        public SequenceIterator gridAggDevSamp(int interval)   {…};
         
        // Window Aggregate
        public SequenceIterator windowAggMax(int interval)   {…};
        public SequenceIterator windowAggMin(int interval)   {…};
        public SequenceIterator windowAggSum(int interval)   {…};
        public SequenceIterator windowAggAvg(int interval)   {…};
        public SequenceIterator windowAggVar(int interval)   {…};
        public SequenceIterator windowAggDev(int interval)   {…};
        public SequenceIterator windowAggVarSamp(int interval)   {…};
        public SequenceIterator windowAggDevSamp(int interval)   {…};
        public SequenceIterator windowAggEma(int period)   {…};
        public SequenceIterator windowAggAtr(int period)   {…};
         
        // Hash Aggregate
        public GroupByResult hashAggMax(SequenceIterator groupBy, int nGroups)   {…};
        public GroupByResult hashAggMin(SequenceIterator groupBy, int nGroups)   {…};
        public GroupByResult hashAggSum(SequenceIterator groupBy, int nGroups)   {…};
        public GroupByResult hashAggAvg(SequenceIterator groupBy, int nGroups)   {…};
        public GroupByResult hashAggCount(int nGroups)   {…};
        public GroupByResult hashAggApproxdc(SequenceIterator groupBy, int nGroups)   {…};
        public GroupByResult hashAggDistinctCount(SequenceIterator groupBy, int nGroups, int nPairs)   {…};
        public GroupByResult hashAggDupCount(SequenceIterator groupBy, int nGroups, int nPairs, int minOccurrences)   {…};
         
        // Cumulative Aggregate
        public SequenceIterator cumAggMax()   {…};
        public SequenceIterator cumAggMin()   {…};
        public SequenceIterator cumAggSum()   {…};
        public SequenceIterator cumAggPrd()   {…};
        public SequenceIterator cumAggAvg()   {…};
        public SequenceIterator cumAggVar()   {…};
        public SequenceIterator cumAggDev()   {…};
        public SequenceIterator cumAggVarSamp()   {…};
        public SequenceIterator cumAggDevSamp()   {…};
         
        // Sequence Manipulator Operations
        public static SequenceIterator parse(String val, Sequence.Type type) {…};
        public SequenceIterator map(SequenceIterator positions)  {…};
        public SequenceIterator[] tee()
        public static SequenceIterator constant(double val, Sequence.Type type)  {…};
        public static SequenceIterator constant(long val, Sequence.Type type)  {…};
        public static SequenceIterator constant(byte[] val, Sequence.Type type)  {…};
        public SequenceIterator concat(SequenceIterator tail)  {…};
        public SequenceIterator cat(SequenceIterator other)  {…};
        public SequenceIterator unique()   {…};
        public SequenceIterator normalize()   {…};
        public SequenceIterator thin(long origin, long step)   {…};
        public SequenceIterator limit(long from, long till)   {…};
        public SequenceIterator reverse()   {…};
        public SequenceIterator diff()   {…};
        public SequenceIterator trend()   {…};
        public SequenceIterator repeat(int count)   {…};
        public SequenceIterator stretch(SequenceIterator ts1, SequenceIterator ts2, long filler)   {…};
        public SequenceIterator stretch(SequenceIterator ts1, SequenceIterator ts2, double filler)   {…};
        public SequenceIterator stretch0(SequenceIterator ts1, SequenceIterator ts2, long filler)   {…};
        public SequenceIterator stretch0(SequenceIterator ts1, SequenceIterator ts2, double filler)   {…};
        public SequenceIterator asofJoin(SequenceIterator ts1, SequenceIterator ts2)   {…};
        public SequenceIterator cross(int firstCrossDirection)   {…};
        public SequenceIterator extrema(int firstExtremum)   {…};
        public SequenceIterator hash()   {…};
        
        public SequenceIterator hash(SequenceIterator other)   {…};
        
         
        // Conversion
        public SequenceIterator cast(Sequence.Type type)   {…};
         
        // Miscellaneous
        public SequenceIterator histogram(long low, long high, int nIntervals)   {…};
        public SequenceIterator histogram(double low, double high, int nIntervals)   {…};
        public void sort(Object arr, long[] permutation, Sequence.Order order)   {…};
         
    };