com.inductiveautomation.ignition.common.expressions

Class AbstractExpression

java.lang.Object

com.inductiveautomation.ignition.common.expressions.AbstractExpression

All Implemented Interfaces:

Expression

Direct Known Subclasses:

AbstractAlertExpressionContext.AlertVariableExpression, ArithmeticExpression, BitwiseExpression, BitwiseNot, BoundPropertyExpression, BoundTagExpression, BoundVariableExpression, ComparisonExpression, EqualityExpression, FunctionExpression, LikeExpression, LogicalExpression, NotExpression, PropertyBasedExpressionParseContext.PropertyReferenceExpression, QueryExpression, SubscriptExpression, TagPathReadExpression, TagReferenceBinder.SubscribedTagExpression, TagReferenceBinder.TagReadExpression, ToStringExpression, UMinusExpression

public abstract class AbstractExpression
extends java.lang.Object
implements Expression

Field Summary

Fields

Modifier and Type	Field and Description
protected Expression[]	children
protected CommonContext	context
protected InteractionListener	updateListener

Constructor Summary

Constructors

Constructor and Description
AbstractExpression()

Method Summary

Modifier and Type	Method and Description
void	connect(CommonContext context, InteractionListener updateListener) Gives the expression a chance to connect itself to things, if necessary.
void	disconnect() Tells the expression to disconnect from anything it was connected to.
Expression[]	getChildren() The children (if any) that this expression is dependent on for its execution
void	setChildren(Expression[] expressions)
void	shutdown() Tells the expression to shutdown any polling operations.
void	startup() Tells the expression to startup any polling operations.
protected void	typeMismatch(Expression offendingExpression, java.lang.Class<?> desiredType)

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.inductiveautomation.ignition.common.expressions.Expression

execute, getOpName, getType

Field Detail

children

protected Expression[] children

context

protected transient CommonContext context

updateListener

protected InteractionListener updateListener

Constructor Detail

AbstractExpression

public AbstractExpression()

Method Detail

typeMismatch

protected void typeMismatch(Expression offendingExpression,
                            java.lang.Class<?> desiredType)

getChildren

public Expression[] getChildren()

Description copied from interface: Expression

The children (if any) that this expression is dependent on for its execution

Specified by:

getChildren in interface Expression

setChildren

public void setChildren(Expression[] expressions)

connect

public void connect(CommonContext context,
                    InteractionListener updateListener)

Description copied from interface: Expression

Gives the expression a chance to connect itself to things, if necessary. Most expressions do not have any connections. An expression should notify the updateListener if they change.

Specified by:

connect in interface Expression

disconnect

public void disconnect()

Description copied from interface: Expression

Tells the expression to disconnect from anything it was connected to.

Specified by:

disconnect in interface Expression

shutdown

public void shutdown()

Description copied from interface: Expression

Tells the expression to shutdown any polling operations.

Specified by:

shutdown in interface Expression

startup

public void startup()

Description copied from interface: Expression

Tells the expression to startup any polling operations. Expressions that use this can remember the updateListener from connect() to feed update notification to.

Specified by:

startup in interface Expression