com.icl.saxon.expr
Class BooleanValue

java.lang.Object
  com.icl.saxon.expr.Expression
      com.icl.saxon.expr.Value
          com.icl.saxon.expr.BooleanValue

public final class BooleanValue

extends Value

A boolean XPath value

Field Summary

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

BooleanValue(boolean value)
Constructor: create a boolean value

Method Summary

boolean	asBoolean() Convert to boolean (null operation)
double	asNumber() Convert to number
java.lang.String	asString() Convert to string
int	conversionPreference(java.lang.Class required) Get conversion preference for this value to a Java class.
java.lang.Object	convertToJava(java.lang.Class target) Convert to Java object (for passing to external functions)
void	display(int level) Diagnostic print of expression structure
int	getDataType() Determine the data type of the exprssion

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

compare, equals, evaluate, getDependencies, inverse, notEquals, numericCompare, reduce, simplify, stringToNumber

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

containsReferences, enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, setStaticContext, usesCurrent

Methods inherited from class java.lang.Object

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

Constructor Detail

BooleanValue

public BooleanValue(boolean value)

Constructor: create a boolean value

Parameters:

value - the initial value, true or false

Method Detail

asString

public java.lang.String asString()

Convert to string

Specified by:

asString in class Value

Returns:

"true" or "false"

asNumber

public double asNumber()

Convert to number

Specified by:

asNumber in class Value

Returns:

1 for true, 0 for false

asBoolean

public boolean asBoolean()

Convert to boolean (null operation)

Specified by:

asBoolean in class Value

Returns:

the value

getDataType

public int getDataType()

Determine the data type of the exprssion

Specified by:

getDataType in class Expression

Returns:

Value.BOOLEAN,

conversionPreference

public int conversionPreference(java.lang.Class required)

Get conversion preference for this value to a Java class. A low result indicates higher preference.

Specified by:

conversionPreference in class Value

convertToJava

public java.lang.Object convertToJava(java.lang.Class target)
                               throws XPathException

Convert to Java object (for passing to external functions)

Specified by:

convertToJava in class Value

Parameters:

target - The class required by the external function

Returns:

an object of the target class

Throws:

XPathException

display

public void display(int level)

Diagnostic print of expression structure

Specified by:

display in class Expression