jaitools.jiffle.runtime
Class AbstractJiffleRuntime

java.lang.Object
  jaitools.jiffle.runtime.AbstractJiffleRuntime

All Implemented Interfaces:

JiffleRuntime

Direct Known Subclasses:

AbstractDirectRuntime, AbstractIndirectRuntime

public abstract class AbstractJiffleRuntime
extends Object
implements JiffleRuntime

Provides default implementations of JiffleRuntime methods plus some common fields.

Since:

1.1

Version:

$Id: AbstractJiffleRuntime.java 1505 2011-03-05 11:37:43Z michael.bedward $

Author:

Michael Bedward

Field Summary

protected JiffleFunctions	_FN Provides runtime function support.
protected double	_outsideValue The value to return for out-of-bounds image data requests if the outside option is set.
protected boolean	_outsideValueSet Whether the outside option is set.
protected IntegerStack	_stk A stack of integer values used in the evaluation of if statements.

Constructor Summary

AbstractJiffleRuntime()
Creates a new instance of this class and initializes its JiffleFunctions and IntegerStack objects.

Method Summary

Double	getVar(String varName) Returns the value of a variable that was declared in the script's init block.
protected abstract void	initImageScopeVars() Initializes image-scope variables.
protected abstract void	initOptionVars() Initializes runtime class fields related to Jiffle script options.

Methods inherited from class java.lang.Object

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

Methods inherited from interface jaitools.jiffle.runtime.JiffleRuntime

setBounds

Field Detail

_outsideValueSet

protected boolean _outsideValueSet

Whether the outside option is set.

_outsideValue

protected double _outsideValue

The value to return for out-of-bounds image data requests if the outside option is set.

_stk

protected IntegerStack _stk

A stack of integer values used in the evaluation of if statements.

_FN

protected final JiffleFunctions _FN

Provides runtime function support.

Constructor Detail

AbstractJiffleRuntime

public AbstractJiffleRuntime()

Creates a new instance of this class and initializes its JiffleFunctions and IntegerStack objects.

Method Detail

getVar

public Double getVar(String varName)

Returns the value of a variable that was declared in the script's init block.

Specified by:

getVar in interface JiffleRuntime

Parameters:

varName - variable name

Returns:

the values or null if the variable name is not found

initImageScopeVars

protected abstract void initImageScopeVars()

Initializes image-scope variables. These are fields in the runtime class. They are initialized in a separate method rather than the constructor because they may depend on expressions involving values that are not known until the processing area is set (e.g. Jiffle's width() function).

initOptionVars

protected abstract void initOptionVars()

Initializes runtime class fields related to Jiffle script options.