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: Class BooleanValue

com.icl.saxon.expr
Class BooleanValue


java.lang.Object

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  +--com.icl.saxon.expr.Expression

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        +--com.icl.saxon.expr.Value

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              +--com.icl.saxon.expr.BooleanValue


public final class BooleanValue
extends Value

A boolean XPath value


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
Overrides:
asString in class Value
Returns:
"true" or "false"

asNumber


public double asNumber()
Convert to number
Overrides:
asNumber in class Value
Returns:
1 for true, 0 for false

asBoolean


public boolean asBoolean()
Convert to boolean (null operation)
Overrides:
asBoolean in class Value
Returns:
the value

getDataType


public int getDataType()
Determine the data type of the exprssion
Overrides:
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.
Overrides:
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)
Overrides:
convertToJava in class Value
Following copied from class: com.icl.saxon.expr.Value
Parameters:
target - The class required by the external function
Returns:
an object of the target class

display


public void display(int level)
Diagnostic print of expression structure
Overrides:
display in class Expression