import net.sf.saxon.tree.iter.SingletonIterator; //导入依赖的package包/类
public SequenceIterator iterate(XPathContext context) throws XPathException {
  final SequenceIterator iterator = myVariable.iterate(context);
  if (iterator instanceof EmptyIterator) {
    final ValueRepresentation value = myVariable.evaluateVariable(context);
    if (value instanceof Item) {
      return SingletonIterator.makeIterator((Item)value);
    } else if (value instanceof net.sf.saxon.value.Value) {
      return ((net.sf.saxon.value.Value)value).iterate();
    } else {
      return iterator;
    }
  } else {
    return iterator;
  }
}
 

import net.sf.saxon.tree.iter.SingletonIterator; //导入依赖的package包/类
@Override
public ExtensionFunctionCall makeCallExpression() {
    return new ExtensionFunctionCall() {
        private static final long serialVersionUID = 1L;

        @Override
        public Sequence call(XPathContext xPathContext, Sequence[] arguments) throws XPathException {
            // 1st argument (mandatory, index 0)
            StringValue arg1 = (StringValue) arguments[0].iterate().next();
            String arg1Str = arg1.getStringValue();

            // 2nd argument (optional, index 1)
            String arg2Str = "";
            if (arguments.length > 1) {
                StringValue arg2 = (StringValue) arguments[1].iterate().next();
                arg2Str = arg2.getStringValue();
            }

            // Functionality goes here
            String resultStr = arg1Str + arg2Str;

            Item result = new StringValue(resultStr);
            return SequenceTool.toLazySequence(SingletonIterator.makeIterator(result));
        }
    };
}
 

import net.sf.saxon.tree.iter.SingletonIterator; //导入依赖的package包/类
@Override
public ExtensionFunctionCall makeCallExpression() {
    return new ExtensionFunctionCall() {
        private static final long serialVersionUID = 1L;

        @Override
        public Sequence call(XPathContext xPathContext, Sequence[] arguments) throws XPathException {
            // 1st argument (mandatory, index 0)
            Int64Value arg1 = (Int64Value) arguments[0].iterate().next();
            int arg1Int = arg1.getDecimalValue().toBigInteger().intValue();

            // 2nd argument (mandatory, index 1)
            Int64Value arg2 = (Int64Value) arguments[1].iterate().next();
            int arg2Int = arg2.getDecimalValue().toBigInteger().intValue();

            // Functionality goes here
            int resultInt = arg1Int + arg2Int;

            Item result = new Int64Value(resultInt);
            return SequenceTool.toLazySequence(SingletonIterator.makeIterator(result));
        }
    };
}
 

import net.sf.saxon.tree.iter.SingletonIterator; //导入依赖的package包/类
@Override
public Sequence next() throws HttpClientException {
  Item item;
  try {
    item = myIt == null ? null : myIt.next();
  } catch (XPathException ex) {
    throw new HttpClientException("Error getting the next item in the sequence", ex);
  }
  SequenceIterator it = SingletonIterator.makeIterator(item);
  return new SaxonSequence(it, myCtxt);
}
 

import net.sf.saxon.tree.iter.SingletonIterator; //导入依赖的package包/类
/**
 * Get the typed value of the item
 */

public SequenceIterator getTypedValue() {
	return SingletonIterator.makeIterator((AtomicValue)atomize());
}
 

import net.sf.saxon.tree.iter.SingletonIterator; //导入依赖的package包/类
@Override
public SequenceIterator<? extends Item> iterate() throws XPathException {
	return SingletonIterator.makeIterator((NodeInfo)this);
}