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## com.singularsys.jep.standard
Class StandardEvaluator

    java.lang.Object
      com.singularsys.jep.standard.StandardEvaluator

All Implemented Interfaces:
  Evaluator, JepComponent, ParserVisitor, java.io.Serializable

    public class StandardEvaluator

extends java.lang.Object
implements Evaluator, ParserVisitor

See Also:
  Serialized Form

Constructor Summary
`StandardEvaluator()`

Method Summary
`java.lang.Object` | `eval(Node node)` Evaluates a sub expression.
`java.lang.Object` | `evaluate(Node node)` Evaluates a node and returns and object with the value of the node.
`JepComponent` | `getLightWeightInstance()` Gets a light-weight instance suitable for using in multiple threads.
`void` | `init(Jep jep)` Initialize the component.
`boolean` | `isTrapNullValues()` Whether null values for variables are trapped.
`void` | `setTrapNullValues(boolean trapNullValues)` Sets whether null values for variables are trapped.
`java.lang.Object` | `visit(ASTConstant node, java.lang.Object data)`
`java.lang.Object` | `visit(ASTFunNode node, java.lang.Object data)`
`java.lang.Object` | `visit(ASTOpNode node, java.lang.Object data)`
`java.lang.Object` | `visit(ASTVarNode node, java.lang.Object data)`
`protected void` | `visitFun(ASTFunNode node)` Visits a function/operator node.

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

Constructor Detail

### StandardEvaluator

    public StandardEvaluator()

Method Detail

### init

    public void init(Jep jep)

  Description copied from interface: `JepComponent`
  Initialize the component. This methods is called whenever a component is added to Jep. Hence it allows components to keep track of the other components they may rely on.

  Specified by:
    `init` in interface `JepComponent`
  Parameters:
    `jep` - the current Jep instance

### eval

    public java.lang.Object eval(Node node)
                          throws EvaluationException

  Description copied from interface: `Evaluator`
  Evaluates a sub expression.

  Specified by:
    `eval` in interface `Evaluator`
  Throws:
    `EvaluationException`

### evaluate

    public java.lang.Object evaluate(Node node)
                              throws EvaluationException

  Description copied from interface: `Evaluator`
  Evaluates a node and returns and object with the value of the node.

  Specified by:
    `evaluate` in interface `Evaluator`
  Throws:
    `EvaluationException`

### visit

    public java.lang.Object visit(ASTConstant node,
                                  java.lang.Object data)
                           throws EvaluationException

  Specified by:
    `visit` in interface `ParserVisitor`
  Throws:
    `EvaluationException`

### visit

    public java.lang.Object visit(ASTFunNode node,
                                  java.lang.Object data)
                           throws EvaluationException

  Specified by:
    `visit` in interface `ParserVisitor`
  Throws:
    `EvaluationException`

### visit

    public java.lang.Object visit(ASTVarNode node,
                                  java.lang.Object data)
                           throws EvaluationException

  Specified by:
    `visit` in interface `ParserVisitor`
  Throws:
    `EvaluationException`

### visit

    public java.lang.Object visit(ASTOpNode node,
                                  java.lang.Object data)
                           throws EvaluationException

  Specified by:
    `visit` in interface `ParserVisitor`
  Throws:
    `EvaluationException`

### visitFun

    protected void visitFun(ASTFunNode node)
                     throws EvaluationException

  Visits a function/operator node. This is the most visited method for most expression evaluations. Keeping it fast is important.

  Parameters:
    `node` -
  Throws:
    `EvaluationException`

### isTrapNullValues

    public boolean isTrapNullValues()

  Whether null values for variables are trapped.

  Returns:
    the status if the trap null values flag.

### setTrapNullValues

    public void setTrapNullValues(boolean trapNullValues)

  Sets whether null values for variables are trapped. If set (the default) then an EvaluationException is thrown for null values of variables. If not set then null values are passed to PostfixMathCommands who will need to test for null values.

  Parameters:
    `trapNullValues` -

### getLightWeightInstance

    public JepComponent getLightWeightInstance()

  Description copied from interface: `JepComponent`
  Gets a light-weight instance suitable for using in multiple threads.

  Specified by:
    `getLightWeightInstance` in interface `JepComponent`
  Returns:
    an new StandardEvaluator

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Copyright © 2008 Singular Systems http://www.singularsys.com/jep