com.inductiveautomation.ignition.common.expressions

Class QueryExpression

java.lang.Object

com.inductiveautomation.ignition.common.expressions.AbstractExpression

com.inductiveautomation.ignition.common.expressions.QueryExpression

All Implemented Interfaces:

Expression

public class QueryExpression
extends AbstractExpression

Field Summary

Fields inherited from class com.inductiveautomation.ignition.common.expressions.AbstractExpression

children, context, updateListener

Constructor Summary

Constructors

Constructor and Description
QueryExpression()

Method Summary

Modifier and Type	Method and Description
QualifiedValue	execute() Returns the query generated by this expression (quality always good).
java.lang.String	getOpName() Return a human-readable name for the operation that this expression performs
java.lang.Class<?>	getType() Return the type that this expression will return

Methods inherited from class com.inductiveautomation.ignition.common.expressions.AbstractExpression

connect, disconnect, getChildren, setChildren, shutdown, startup, typeMismatch

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryExpression

public QueryExpression()

Method Detail

execute

public QualifiedValue execute()
                       throws ExpressionException

Returns the query generated by this expression (quality always good). In theory we could optimize this by not creating the string each time, only when something has changed, but it shouldn't be too big of a deal to do it like this.

Throws:

ExpressionException

getOpName

public java.lang.String getOpName()

Description copied from interface: Expression

Return a human-readable name for the operation that this expression performs

getType

public java.lang.Class<?> getType()

Description copied from interface: Expression

Return the type that this expression will return