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Java Source Code / Java Documentation » Library » Apache commons jexl 1.1 src » org.apache.commons.jexl 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.commons.jexl.ExpressionFactory

ExpressionFactory
public class ExpressionFactory (Code)

Creates Expression objects. To create a JEXL Expression object, pass valid JEXL syntax to the static createExpression() method:

 String jexl = "array[1]";
 Expression expression = ExpressionFactory.createExpression( jexl );
 

When an Expression object is created, the JEXL syntax is parsed and verified. If the supplied expression is neither an expression nor a reference, an exception is thrown from createException().


since:
   1.0
author:
   Geir Magnusson Jr.
version:
   $Id: ExpressionFactory.java 429169 2006-08-06 18:36:29Z rahul $


Field Summary
protected static  ExpressionFactoryef
     ExpressionFactory is a singleton and this is the private instance fufilling that pattern.
protected static  Loglog
     The Log to which all ExpressionFactory messages will be logged.
protected static  Parserparser
     The singleton ExpressionFactory also holds a single instance of Parser .


Method Summary
public static  ExpressioncreateExpression(String expression)
     Creates an Expression from a String containing valid JEXL syntax.
protected  ExpressioncreateNewExpression(String expression)
     Creates a new Expression based on the expression string.
protected static  ExpressionFactorygetInstance()
     Returns the single instance of ExpressionFactory.

Field Detail
ef
protected static ExpressionFactory ef(Code)
ExpressionFactory is a singleton and this is the private instance fufilling that pattern.



log
protected static Log log(Code)
The Log to which all ExpressionFactory messages will be logged.



parser
protected static Parser parser(Code)
The singleton ExpressionFactory also holds a single instance of Parser . When parsing expressions, ExpressionFactory synchronizes on Parser.





Method Detail
createExpression
public static Expression createExpression(String expression) throws Exception(Code)
Creates an Expression from a String containing valid JEXL syntax. This method parses the expression which must contain either a reference or an expression.
Parameters:
  expression - A String containing valid JEXL syntax An Expression object which can be evaluated with a JexlContext
throws:
  Exception - An exception can be thrown if there is a problemparsing this expression, or if the expression is neither anexpression or a reference.



createNewExpression
protected Expression createNewExpression(String expression) throws Exception(Code)
Creates a new Expression based on the expression string.
Parameters:
  expression - valid Jexl expression Expression
throws:
  Exception - for a variety of reasons - mostly malformedJexl expression



getInstance
protected static ExpressionFactory getInstance()(Code)
Returns the single instance of ExpressionFactory. the instance of ExpressionFactory.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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