com.icl.saxon.expr
Class TextFragmentValue

java.lang.Object
  com.icl.saxon.expr.Expression
      com.icl.saxon.expr.Value
          com.icl.saxon.expr.NodeSetValue
              com.icl.saxon.expr.SingletonNodeSet
                  com.icl.saxon.expr.TextFragmentValue

All Implemented Interfaces:

org.w3c.dom.NodeList

public final class TextFragmentValue

extends SingletonNodeSet

This class represents a Value of type result tree fragment, specifically, an RTF whose root owns a single text node.

Field Summary

Fields inherited from class com.icl.saxon.expr.SingletonNodeSet

generalUseAllowed, node

Fields inherited from class com.icl.saxon.expr.Value

ANY, BOOLEAN, NODESET, NUMBER, OBJECT, STRING

Fields inherited from class com.icl.saxon.expr.Expression

staticContext

Constructor Summary

TextFragmentValue(java.lang.String value, java.lang.String systemId, Controller controller)
Constructor: create a result tree fragment containing a single text node

Method Summary

boolean	asBoolean() Convert the result tree fragment to a boolean
double	asNumber() Convert the result tree fragment to a number
java.lang.String	asString() Convert the result tree fragment to a string.
boolean	compare(int operator, Value other) Test how a FragmentValue compares to another Value under a relational comparison.
void	copy(Outputter out) Copy the result tree fragment value to a given Outputter
void	display(int level) Diagnostic print of expression structure
NodeEnumeration	enumerate() Return an enumeration of this nodeset value.
boolean	equals(Value other) Test whether a nodeset "equals" another Value
int	getCount() Count the nodes in the node-set.
int	getDataType() Determine the data type of the expression, if possible
NodeInfo	getFirst() Get the first node in the nodeset (in document order)
DocumentInfo	getRootNode() Get the root (document) node
int	getType() Return the type of the value
boolean	notEquals(Value other) Test whether a nodeset "not-equals" another Value
void	outputStringValue(Outputter out, Context context) Evaluate an expression as a String and write the result to the specified outputter.
Expression	simplify() Simplify the expression

Methods inherited from class com.icl.saxon.expr.SingletonNodeSet

allowGeneralUse, evaluate, evaluateAsNodeSet, getLength, isGeneralUseAllowed, isSorted, item, setSorted, sort

Methods inherited from class com.icl.saxon.expr.NodeSetValue

conversionPreference, convertToJava, enumerate

Methods inherited from class com.icl.saxon.expr.Value

getDependencies, inverse, numericCompare, reduce, stringToNumber

Methods inherited from class com.icl.saxon.expr.Expression

containsReferences, evaluateAsBoolean, evaluateAsNumber, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, setStaticContext, usesCurrent

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TextFragmentValue

public TextFragmentValue(java.lang.String value,
                         java.lang.String systemId,
                         Controller controller)

Constructor: create a result tree fragment containing a single text node

Method Detail

asString

public java.lang.String asString()

Convert the result tree fragment to a string.

Overrides:

asString in class SingletonNodeSet

Returns:

the value of the first node in the node-set if there is one, otherwise an empty string

outputStringValue

public void outputStringValue(Outputter out,
                              Context context)
                       throws TransformerException

Evaluate an expression as a String and write the result to the specified outputter.

Overrides:

outputStringValue in class Expression

Parameters:

out - The required outputter

context - The context in which the expression is to be evaluated

Throws:

TransformerException

asNumber

public double asNumber()

Convert the result tree fragment to a number

Overrides:

asNumber in class NodeSetValue

Returns:

the number obtained by evaluating as a String and converting the string to a number

asBoolean

public boolean asBoolean()

Convert the result tree fragment to a boolean

Overrides:

asBoolean in class SingletonNodeSet

Returns:

true if the node set is not empty

getCount

public int getCount()

Count the nodes in the node-set.

Overrides:

getCount in class SingletonNodeSet

simplify

public Expression simplify()

Simplify the expression

Overrides:

simplify in class SingletonNodeSet

getFirst

public NodeInfo getFirst()

Get the first node in the nodeset (in document order)

Overrides:

getFirst in class SingletonNodeSet

Returns:

the first node

enumerate

public NodeEnumeration enumerate()
                          throws XPathException

Return an enumeration of this nodeset value.

Overrides:

enumerate in class SingletonNodeSet

Throws:

XPathException

equals

public boolean equals(Value other)
               throws XPathException

Test whether a nodeset "equals" another Value

Overrides:

equals in class SingletonNodeSet

Throws:

XPathException

notEquals

public boolean notEquals(Value other)
                  throws XPathException

Test whether a nodeset "not-equals" another Value

Overrides:

notEquals in class SingletonNodeSet

Throws:

XPathException

compare

public boolean compare(int operator,
                       Value other)
                throws XPathException

Test how a FragmentValue compares to another Value under a relational comparison.

Overrides:

compare in class NodeSetValue

Parameters:

operator - The comparison operator, one of Tokenizer.LE, Tokenizer.LT, Tokenizer.GE, Tokenizer.GT,

Throws:

XPathException

getType

public int getType()

Return the type of the value

Returns:

Value.NODESET (always)

getDataType

public int getDataType()

Determine the data type of the expression, if possible

Overrides:

getDataType in class NodeSetValue

Returns:

Value.NODESET

getRootNode

public DocumentInfo getRootNode()

Get the root (document) node

copy

public void copy(Outputter out)
          throws TransformerException

Copy the result tree fragment value to a given Outputter

Throws:

TransformerException

display

public void display(int level)

Diagnostic print of expression structure

Overrides:

display in class NodeSetValue