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


java.lang.Object
   net.sf.saxon.value.Value
      net.sf.saxon.value.SingletonNode

SingletonNode
public class SingletonNode extends Value (Code)
A value that is a sequence containing zero or one nodes


Field Summary
protected  NodeInfonode
    

Constructor Summary
public  SingletonNode(NodeInfo node)
    

Method Summary
public  ObjectconvertToJava(Class target, XPathContext context)
    
public  voiddisplay(int depth, NamePool pool, PrintStream out)
    
public  booleaneffectiveBooleanValue(XPathContext context)
    
public  StringevaluateAsString(XPathContext context)
     Evaluate an expression as a String.
public  ItemevaluateItem(XPathContext context)
    
public  intgetCardinality()
    
public  intgetImplementationMethod()
     An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().
public  ItemTypegetItemType(TypeHierarchy th)
     Determine the data type of the items in the expression.
public  intgetLength()
    
public  NodeInfogetNode()
     Get the node that forms the node-set.
public  intgetSpecialProperties()
     Get the static properties of this expression (other than its type).
public  StringgetStringValue()
     Convert the value to a string, using the serialization rules. For atomic values this is the same as a cast; for sequence values it gives a space-separated list.
public  ItemitemAt(int n)
     Get the n'th item in the sequence (starting from 0).
public  SequenceIteratoriterate(XPathContext context)
     Return an enumeration of this nodeset value.
public  voidprocess(XPathContext context)
    

Field Detail
node
protected NodeInfo node(Code)




Constructor Detail
SingletonNode
public SingletonNode(NodeInfo node)(Code)
Create a node-set containing zero or one nodes
Parameters:
  node - The node to be contained in the node-set, or null if the node-setis to be empty




Method Detail
convertToJava
public Object convertToJava(Class target, XPathContext context) throws XPathException(Code)
Convert to Java object (for passing to external functions)



display
public void display(int depth, NamePool pool, PrintStream out)(Code)
Diagnostic display



effectiveBooleanValue
public boolean effectiveBooleanValue(XPathContext context)(Code)
Get the effective boolean value



evaluateAsString
public String evaluateAsString(XPathContext context) throws XPathException(Code)
Evaluate an expression as a String. This function must only be called in contexts where it is known that the expression will return a single string (or where an empty sequence is to be treated as a zero-length string). Implementations should not attempt to convert the result to a string, other than converting () to "". This method is used mainly to evaluate expressions produced by compiling an attribute value template.
exception:
  XPathException - if any dynamic error occurs evaluating theexpression
Parameters:
  context - The context in which the expression is to be evaluated the value of the expression, evaluated in the current context.The expression must return a string or (); if the value of theexpression is (), this method returns "".



evaluateItem
public Item evaluateItem(XPathContext context)(Code)
Evaluate as an item



getCardinality
public int getCardinality()(Code)
Determine the static cardinality



getImplementationMethod
public int getImplementationMethod()(Code)
An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process(). This method indicates which of these methods is prefered.



getItemType
public ItemType getItemType(TypeHierarchy th)(Code)
Determine the data type of the items in the expression. This method determines the most precise type that it can, because it is called when testing that the node conforms to a required type. the most precise possible type of the node.
Parameters:
  th -



getLength
public int getLength() throws XPathException(Code)
Get the length of the sequence



getNode
public NodeInfo getNode()(Code)
Get the node that forms the node-set. Return null if there is none.



getSpecialProperties
public int getSpecialProperties()(Code)
Get the static properties of this expression (other than its type). The result is bit-signficant. These properties are used for optimizations. In general, if property bit is set, it is true, but if it is unset, the value is unknown.



getStringValue
public String getStringValue()(Code)
Convert the value to a string, using the serialization rules. For atomic values this is the same as a cast; for sequence values it gives a space-separated list. For QNames and NOTATIONS, or lists containing them, it fails.



itemAt
public Item itemAt(int n) throws XPathException(Code)
Get the n'th item in the sequence (starting from 0). This is defined for all SequenceValues, but its real benefits come for a SequenceValue stored extensionally (or for a MemoClosure, once all the values have been read)



iterate
public SequenceIterator iterate(XPathContext context)(Code)
Return an enumeration of this nodeset value.



process
public void process(XPathContext context) throws XPathException(Code)
Process the instruction, without returning any tail calls
Parameters:
  context - The dynamic context, giving access to the current node,the current variables, etc.



Fields inherited from net.sf.saxon.value.Value
final public static Class[] EMPTY_CLASS_ARRAY(Code)(Java Doc)

Methods inherited from net.sf.saxon.value.Value
public static Item asItem(ValueRepresentation value, XPathContext context) throws XPathException(Code)(Java Doc)
public static SequenceIterator asIterator(ValueRepresentation val, XPathContext context) throws XPathException(Code)(Java Doc)
public static Value asValue(ValueRepresentation val)(Code)(Java Doc)
public void checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) throws XPathException(Code)(Java Doc)
public static CharSequence collapseWhitespace(CharSequence in)(Code)(Java Doc)
public static Object convert(Item item) throws XPathException(Code)(Java Doc)
public static Value convertJavaObjectToXPath(Object object, SequenceType requiredType, Configuration config) throws XPathException(Code)(Java Doc)
public Object convertToJava(Class target, XPathContext context) throws XPathException(Code)(Java Doc)
public void display(int level, NamePool pool, PrintStream out)(Code)(Java Doc)
public boolean effectiveBooleanValue(XPathContext context) throws XPathException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
public String evaluateAsString(XPathContext context) throws XPathException(Code)(Java Doc)
public Item evaluateItem(XPathContext context) throws XPathException(Code)(Java Doc)
public int getCardinality()(Code)(Java Doc)
final public int getDependencies()(Code)(Java Doc)
public ItemType getItemType(TypeHierarchy th)(Code)(Java Doc)
public static SequenceIterator getIterator(ValueRepresentation val) throws XPathException(Code)(Java Doc)
public int getLength() throws XPathException(Code)(Java Doc)
final public Container getParentExpression()(Code)(Java Doc)
public int getSpecialProperties()(Code)(Java Doc)
public String getStringValue() throws XPathException(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
public Item itemAt(int n) throws XPathException(Code)(Java Doc)
final public Iterator iterateSubExpressions()(Code)(Java Doc)
public static QNameValue makeQNameValue(Object object, Configuration config)(Code)(Java Doc)
public static CharSequence normalizeWhitespace(CharSequence in)(Code)(Java Doc)
final public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType)(Code)(Java Doc)
public void process(XPathContext context) throws XPathException(Code)(Java Doc)
final public Expression promote(PromotionOffer offer)(Code)(Java Doc)
public Value reduce() throws XPathException(Code)(Java Doc)
public boolean schemaEquals(Value obj)(Code)(Java Doc)
final public Expression simplify(StaticContext env)(Code)(Java Doc)
public static double stringToNumber(CharSequence s) throws NumberFormatException(Code)(Java Doc)
public String toString()(Code)(Java Doc)
public static CharSequence trimWhitespace(CharSequence in)(Code)(Java Doc)
final public Expression typeCheck(StaticContext env, ItemType contextItemType)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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