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: Class FormatNumber
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com.icl.saxon.functions
Class FormatNumber


java.lang.Object

  |

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

        |

        +--com.icl.saxon.expr.Function

              |

              +--com.icl.saxon.functions.FormatNumber
public class FormatNumber
extends Function

Fields inherited from class com.icl.saxon.expr.Function
argument
 
Fields inherited from class com.icl.saxon.expr.Expression
staticContext
 
Constructor Summary
FormatNumber()
           
 
Method Summary
 Value evaluate(Context c)
          Evaluate in a general context
 java.lang.String evaluateAsString(Context context)
          Evaluate in a context where a string is wanted
 java.lang.String formatNumber(double n, java.lang.String format, java.text.DecimalFormatSymbols dfs)
          Here is the method that does the work.
 int getDataType()
          Determine the data type of the exprEssion
 int getDependencies()
          Determine the dependencies
 java.lang.String getName()
          Get the name of the function.
 Expression reduce(int dep, Context c)
          Reduce the dependencies
 Expression simplify()
          Simplify and validate
 
Methods inherited from class com.icl.saxon.expr.Function
addArgument, checkArgumentCount, display, getNumberOfArguments
 
Methods inherited from class com.icl.saxon.expr.Expression
containsReferences, enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, 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

FormatNumber


public FormatNumber()
Method Detail

getName


public java.lang.String getName()
Description copied from class: Function
Get the name of the function. This method must be implemented in all subclasses.
Overrides:
getName in class Function
Following copied from class: com.icl.saxon.expr.Function
Returns:
the name of the function, as used in XSL expressions, but excluding its namespace prefix

getDataType


public int getDataType()
Determine the data type of the exprEssion
Overrides:
getDataType in class Expression
Returns:
Value.STRING

simplify


public Expression simplify()
                    throws XPathException
Simplify and validate
Overrides:
simplify in class Expression
Following copied from class: com.icl.saxon.expr.Expression
Returns:
the simplified expression

evaluateAsString


public java.lang.String evaluateAsString(Context context)
                                  throws XPathException
Evaluate in a context where a string is wanted
Overrides:
evaluateAsString in class Expression
Following copied from class: com.icl.saxon.expr.Expression
Parameters:
context - The context in which the expression is to be evaluated
Returns:
the value of the expression, evaluated in the current context

evaluate


public Value evaluate(Context c)
               throws XPathException
Evaluate in a general context
Overrides:
evaluate in class Expression
Following copied from class: com.icl.saxon.expr.Expression
Parameters:
context - The context in which the expression is to be evaluated
Returns:
the value of the expression, evaluated in the current context

formatNumber


public java.lang.String formatNumber(double n,
                                     java.lang.String format,
                                     java.text.DecimalFormatSymbols dfs)
                              throws XPathException
Here is the method that does the work. It needs to be synchronized because it remembers information from one invocation to the next; it doesn't matter if these are in different threads but it can't be interrupted. The reason for remembering information is that getting a new DecimalFormatSymbols each time is incredibly expensive, especially with the Microsoft Java VM. Actually the synchronization is unnecessary if there is a bound Controller.

getDependencies


public int getDependencies()
Determine the dependencies
Overrides:
getDependencies in class Expression

reduce


public Expression reduce(int dep,
                         Context c)
                  throws XPathException
Reduce the dependencies
Overrides:
reduce in class Expression
Following copied from class: com.icl.saxon.expr.Expression
Parameters:
dependencies - The dependencies to be removed, e.g. Context.VARIABLES
context - The context to be used for the partial evaluation
Returns:
a new expression (or Value) that does not have any of the specified dependencies
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