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: Class BooleanValue

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com.icl.saxon.expr
Class BooleanValue

java.lang.Object

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  +--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

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