Java Doc for Item.java in  » XML » XPath-Saxon » net » sf » saxon » om » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » XPath Saxon » net.sf.saxon.om 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


net.sf.saxon.om.Item

All known Subclasses:   net.sf.saxon.value.AtomicValue,
Item
public interface Item extends ValueRepresentation(Code)
An Item is an object that can occur as a member of a sequence. It corresponds directly to the concept of an item in the XPath 2.0 data model. There are two kinds of Item: atomic values, and nodes.

This interface is part of the public Saxon API. As such (starting from Saxon 8.4), methods that form part of the stable API are labelled with a JavaDoc "since" tag to identify the Saxon release at which they were introduced.

Note: there is no method getItemType(). This is to avoid having to implement it on every implementation of NodeInfo. Instead, use the static method Type.getItemType(Item).
author:
   Michael H. Kay
since:
   8.4





Method Summary
public  StringgetStringValue()
     Get the value of the item as a string.
public  CharSequencegetStringValueCS()
     Get the string value of the item as a CharSequence.
public  SequenceIteratorgetTypedValue()
     Get the typed value of the item.

For a node, this is the typed value as defined in the XPath 2.0 data model.




Method Detail
getStringValue
public String getStringValue()(Code)
Get the value of the item as a string. For nodes, this is the string value of the node as defined in the XPath 2.0 data model, except that all nodes are treated as being untyped: it is not an error to get the string value of a node with a complex type. For atomic values, the method returns the result of casting the atomic value to a string.

If the calling code can handle any CharSequence, the method Item.getStringValueCS should be used. If the caller requires a string, this method is preferred. the string value of the item
See Also:   Item.getStringValueCS
since:
   8.4




getStringValueCS
public CharSequence getStringValueCS()(Code)
Get the string value of the item as a CharSequence. This is in some cases more efficient than the version of the method that returns a String. The method satisfies the rule that X.getStringValueCS().toString() returns a string that is equal to X.getStringValue().

Note that two CharSequence values of different types should not be compared using equals(), and for the same reason they should not be used as a key in a hash table.

If the calling code can handle any CharSequence, this method should be used. If the caller requires a string, the Item.getStringValue method is preferred. the string value of the item
See Also:   Item.getStringValue
since:
   8.4




getTypedValue
public SequenceIterator getTypedValue() throws XPathException(Code)
Get the typed value of the item.

For a node, this is the typed value as defined in the XPath 2.0 data model. Since a node may have a list-valued data type, the typed value is in general a sequence, and it is returned in the form of a SequenceIterator.

If the node has not been validated against a schema, the typed value will be the same as the string value, either as an instance of xs:string or as an instance of xdt:untypedAtomic, depending on the node kind.

For an atomic value, this method returns an iterator over a singleton sequence containing the atomic value itself. an iterator over the items in the typed value of the node or atomic value. Theitems returned by this iterator will always be atomic values.
throws:
  XPathException - where no typed value is available, for example in the case ofan element with complex content
since:
   8.4




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