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## org.jbpm.jpdl.el.impl
Class Expression

    java.lang.Object
      org.jbpm.jpdl.el.impl.Expression

Direct Known Subclasses:
  BinaryOperatorExpression, ComplexValue, ConditionalExpression, FunctionInvocation, Literal, NamedValue, UnaryOperatorExpression

    public abstract class Expression

extends java.lang.Object

The abstract class from which all expression types derive.

Version:
  $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author$
Author:
  Nathan Abramson - Art Technology Group, Shawn Bayern

Constructor Summary
`Expression()`

Method Summary
`abstract java.lang.Object` | `evaluate(VariableResolver pResolver, FunctionMapper functions, Logger pLogger)` Evaluates the expression in the given context
`abstract java.lang.String` | `getExpressionString()` Returns the expression in the expression language syntax

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Expression

    public Expression()

Method Detail

### getExpressionString

    public abstract java.lang.String getExpressionString()

  Returns the expression in the expression language syntax

### evaluate

    public abstract java.lang.Object evaluate(VariableResolver pResolver,
                                              FunctionMapper functions,
                                              Logger pLogger)
                                       throws ELException

  Evaluates the expression in the given context

  Throws:
    `ELException`

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