org.opennms.netmgt.threshd
Class ExpressionConfigWrapper

java.lang.Object
  org.opennms.netmgt.threshd.BaseThresholdDefConfigWrapper
      org.opennms.netmgt.threshd.ExpressionConfigWrapper

public class ExpressionConfigWrapper
extends BaseThresholdDefConfigWrapper

ExpressionConfigWrapper class.

Author:

Jeff Gehlbach, Craig Miskell

Constructor Summary

ExpressionConfigWrapper(Expression expression)
Constructor for ExpressionConfigWrapper.

Method Summary

double	evaluate(Map<String,Double> values) Evaluate the threshold expression/datasource in terms of the named values supplied, and return that value
String	getDatasourceExpression() getDatasourceExpression
Collection<String>	getRequiredDatasources() Returns the names of the datasources required to evaluate this threshold

Methods inherited from class org.opennms.netmgt.threshd.BaseThresholdDefConfigWrapper

equals, getBasethresholddef, getConfigWrapper, getDsLabel, getDsType, getRearm, getRearmedUEI, getTrigger, getTriggeredUEI, getType, getValue, hashCode, hasRearm, hasTrigger, hasValue, identical, merge

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionConfigWrapper

public ExpressionConfigWrapper(Expression expression)
                        throws ThresholdExpressionException

Constructor for ExpressionConfigWrapper.

Parameters:

expression - a Expression object.

Throws:

ThresholdExpressionException - if any.

Method Detail

getDatasourceExpression

public String getDatasourceExpression()

getDatasourceExpression

Specified by:

getDatasourceExpression in class BaseThresholdDefConfigWrapper

Returns:

a descriptive string for the data source - typically either a data source name, or an expression of data source names

getRequiredDatasources

public Collection<String> getRequiredDatasources()

Returns the names of the datasources required to evaluate this threshold

Specified by:

getRequiredDatasources in class BaseThresholdDefConfigWrapper

Returns:

Collection of the names of datasources

evaluate

public double evaluate(Map<String,Double> values)
                throws ThresholdExpressionException

Evaluate the threshold expression/datasource in terms of the named values supplied, and return that value

Specified by:

evaluate in class BaseThresholdDefConfigWrapper

Parameters:

values - named values to use in evaluating the expression/data source

Returns:

the value of the evaluated expression

Throws:

ThresholdExpressionException - if any.