net.sf.jec
Class ExpressionCompiler

java.lang.Object
  net.sf.jec.ExpressionCompiler

public class ExpressionCompiler

extends java.lang.Object

This class precompiles bean expressions so their evaluation becomes faster.

Author:

mballesteros

Constructor Summary

ExpressionCompiler(boolean throwExceptions)
Creates a new ExpressionCompiler that uses the specified ObjectConverter

Method Summary

void	addFunction(java.lang.String name, Function function) Adds a new function to the compiler
void	addOperator(java.lang.String name, java.lang.Class operatorClass) Adds a new function to the compiler
Operator	compileOperator(java.lang.String expr) Compiles an expression into an operator
static ExpressionCompiler	getDefaultInstance(boolean throwExceptions) Returns an ExpressionCompiler with default operators and functions.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionCompiler

public ExpressionCompiler(boolean throwExceptions)

Creates a new ExpressionCompiler that uses the specified ObjectConverter

Method Detail

getDefaultInstance

public static ExpressionCompiler getDefaultInstance(boolean throwExceptions)

Returns an ExpressionCompiler with default operators and functions. It is a convenience method that creates a new ExpressionCompiler and adds all the basic operators and functions with compehensive names. The complete list of added operators and functions is:

• Operators:
  1. $avg: See AvgOperator
  2. $count: See CountOperator
  3. $groupby: See GroupByOperator
  4. $max: See MaxOperator
  5. $min: See MinOperator
  6. $orderby: See OrderByOperator
  7. $select: See SelectOperator
  8. $sum: See SumOperator
  9. $table: See TableOperator
• Functions:
  1. $currency: See CurrencyOperator
  2. $date: See DateFunction with "dd/MM/yyyy"
  3. $percent: See PercentOperator

Parameters:

throwExceptions -

Returns:

ExpressionCompiler

addOperator

public void addOperator(java.lang.String name,
                        java.lang.Class operatorClass)

Adds a new function to the compiler

addFunction

public void addFunction(java.lang.String name,
                        Function function)

Adds a new function to the compiler

compileOperator

public Operator compileOperator(java.lang.String expr)
                         throws ParseException

Compiles an expression into an operator

Throws:

ParseException