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public interface Item<T extends Item>
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).
Field Summary |
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Fields inherited from interface net.sf.saxon.om.ValueRepresentation |
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EMPTY_VALUE_ARRAY |
Method Summary | |
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String |
getStringValue()
Get the value of the item as a string. |
CharSequence |
getStringValueCS()
Get the string value of the item as a CharSequence. |
SequenceIterator<? extends AtomicValue> |
getTypedValue()
Get the typed value of the item. |
Method Detail |
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String getStringValue()
If the calling code can handle any CharSequence, the method getStringValueCS()
should
be used. If the caller requires a string, this method is preferred.
getStringValue
in interface ValueRepresentation<T extends Item>
UnsupportedOperationException
- if the item is a function item (an unchecked exception
is used here to avoid introducing exception handling to a large number of paths where it is not
needed)getStringValueCS()
CharSequence getStringValueCS()
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 getStringValue()
method is preferred.
getStringValueCS
in interface ValueRepresentation<T extends Item>
UnsupportedOperationException
- if the item is a function item (an unchecked exception
is used here to avoid introducing exception handling to a large number of paths where it is not
needed)getStringValue()
SequenceIterator<? extends AtomicValue> getTypedValue() throws XPathException
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 xs:untypedAtomic, depending on the node kind.
For an atomic value, this method returns an iterator over a singleton sequence containing the atomic value itself.
XPathException
- where no typed value is available, for example in the case of
an element with complex content
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