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java.lang.Object | +--org.apache.commons.jexl.ExpressionFactory
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().
| Field Summary | |
protected static ExpressionFactory |
ef
ExpressionFactory is a singleton and this is the private instance fufilling that pattern. |
protected static Log |
log
The Log to which all ExpressionFactory messages will be logged. |
protected static Parser |
parser
The singleton ExpressionFactory also holds a single instance of Parser. |
| Method Summary | |
static Expression |
createExpression(String expression)
Creates an Expression from a String containing valid JEXL syntax. |
protected Expression |
createNewExpression(String expression)
Creates a new Expression based on the expression string. |
protected static ExpressionFactory |
getInstance()
Returns the single instance of ExpressionFactory. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
protected static Log log
protected static Parser parser
Parser.
When parsing expressions, ExpressionFactory synchronizes on Parser.protected static ExpressionFactory ef
| Method Detail |
protected static ExpressionFactory getInstance()
public static Expression createExpression(String expression)
throws Exception
expression - A String containing valid JEXL syntaxException - An exception can be thrown if there is a problem
parsing this expression, or if the expression is neither an
expression or a reference.
protected Expression createNewExpression(String expression)
throws Exception
expression - valid Jexl expressionException - for a variety of reasons - mostly malformed
Jexl expression
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