org.qtitools.qti.node.expression.general
Class RandomInteger

java.lang.Object
  org.qtitools.qti.node.AbstractNode
      org.qtitools.qti.node.AbstractObject
          org.qtitools.qti.node.expression.AbstractExpression
              org.qtitools.qti.node.expression.RandomExpression
                  org.qtitools.qti.node.expression.general.RandomInteger

All Implemented Interfaces:

java.io.Serializable, Expression, ExpressionParent, XmlNode, XmlObject, Validatable

Direct Known Subclasses:

RandomIntegerEx

public class RandomInteger
extends RandomExpression

Selects A random integer from the specified range [min,max] satisfying min + step * n for some integer n. For example, with min=2, max=11 and step=3 the values {2,5,8,11} are possible.

Additional conditions: max >= min, step >= 1

Author:

Jiri Kajaba

See Also:

Serialized Form

Field Summary

static java.lang.String	ATTR_MAXIMUM_NAME Name of max attribute in xml schema.
static java.lang.String	ATTR_MINIMUM_NAME Name of min attribute in xml schema.
static int	ATTR_STEP_DEFAULT_VALUE Default value of step attribute.
static java.lang.String	ATTR_STEP_NAME Name of step attribute in xml schema.
static java.lang.String	CLASS_TAG Name of this class in xml schema.

Fields inherited from class org.qtitools.qti.node.expression.AbstractExpression

logger

Fields inherited from interface org.qtitools.qti.node.expression.Expression

DISPLAY_NAME

Fields inherited from interface org.qtitools.qti.node.XmlNode

INDENT, NEW_LINE, SIMPLE_NAME_INNER_SEPARATOR, SIMPLE_NAMES_SEPARATOR

Constructor Summary

RandomInteger(ExpressionParent parent)
Constructs expression.

Method Summary

protected IntegerValue	evaluateSelf(int depth) Evaluates this expression.
java.lang.String	getClassTag() Gets QTI class name of this node.
java.lang.Integer	getMaximum() Gets value of max attribute.
java.lang.Integer	getMinimum() Gets value of min attribute.
protected java.lang.Long	getSeedAttributeValue() Gets value of seed attribute.
java.lang.Integer	getStep() Gets value of step attribute.
boolean	isVariable() Returns true if value of evaluation can change every evaluation call; false otherwise.
void	setMaximum(java.lang.Integer maximum) Sets new value of max attribute.
void	setMinimum(java.lang.Integer minimum) Sets new value of min attribute.
void	setStep(java.lang.Integer step) Sets new value of step attribute.
protected ValidationResult	validateAttributes() Validates attributes of this node.

Methods inherited from class org.qtitools.qti.node.expression.RandomExpression

getRandomGenerator

Methods inherited from class org.qtitools.qti.node.expression.AbstractExpression

evaluate, getBaseType, getCardinality, getChildren, getFirstChild, getParent, getParentRequiredBaseTypes, getParentRequiredCardinalities, getProducedBaseTypes, getProducedCardinalities, getProducedNumericalBaseTypes, getRequiredBaseTypes, getRequiredCardinalities, getRequiredSameBaseTypes, getRequiredSameCardinalities, getSecondChild, getType, getValue, isAnyChildNull, isNull, reset, toString, validate

Methods inherited from class org.qtitools.qti.node.AbstractObject

getParentItem, getParentResult, getParentTest, setParent

Methods inherited from class org.qtitools.qti.node.AbstractNode

attrToXmlString, bodyToXmlString, getAttributes, getFullName, getIndent, getNode, getNode, getNode, getNodeGroups, getParentRoot, getSimpleName, getSourceFile, getSourceNode, getSourceString, getSourceUrl, hasChildNodes, load, load, load, load, loadAttributes, readChild, readChildren, setParent, setSourceFile, setSourceNode, setSourceString, setSourceUrl, toXmlString, toXmlString, validateChildren

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.qtitools.qti.node.XmlObject

getParentItem, getParentResult, getParentTest, setParent

Methods inherited from interface org.qtitools.qti.node.XmlNode

getAttributes, getFullName, getNodeGroups, getParentRoot, getSimpleName, getSourceFile, getSourceNode, getSourceString, getSourceUrl, hasChildNodes, load, load, load, load, setSourceFile, setSourceNode, setSourceString, setSourceUrl, toXmlString, toXmlString

Field Detail

CLASS_TAG

public static final java.lang.String CLASS_TAG

Name of this class in xml schema.

See Also:

Constant Field Values

ATTR_MINIMUM_NAME

public static final java.lang.String ATTR_MINIMUM_NAME

Name of min attribute in xml schema.

See Also:

Constant Field Values

ATTR_MAXIMUM_NAME

public static final java.lang.String ATTR_MAXIMUM_NAME

Name of max attribute in xml schema.

See Also:

Constant Field Values

ATTR_STEP_NAME

public static final java.lang.String ATTR_STEP_NAME

Name of step attribute in xml schema.

See Also:

Constant Field Values

ATTR_STEP_DEFAULT_VALUE

public static final int ATTR_STEP_DEFAULT_VALUE

Default value of step attribute.

See Also:

Constant Field Values

Constructor Detail

RandomInteger

public RandomInteger(ExpressionParent parent)

Constructs expression.

Parameters:

parent - parent of this expression

Method Detail

getClassTag

public java.lang.String getClassTag()

Description copied from interface: XmlNode

Gets QTI class name of this node.

QTI class name has very important role during loading/saving nodes.

For example: Java class name is AssessmentTest; QTI class name is assessmentTest.

Specified by:

getClassTag in interface XmlNode

Specified by:

getClassTag in class AbstractNode

Returns:

QTI class name of this node

getMinimum

public java.lang.Integer getMinimum()

Gets value of min attribute.

Returns:

value of min attribute

See Also:

setMinimum(java.lang.Integer)

setMinimum

public void setMinimum(java.lang.Integer minimum)

Sets new value of min attribute.

Parameters:

minimum - new value of min attribute

See Also:

getMinimum()

getMaximum

public java.lang.Integer getMaximum()

Gets value of max attribute.

Returns:

value of max attribute

See Also:

setMaximum(java.lang.Integer)

setMaximum

public void setMaximum(java.lang.Integer maximum)

Sets new value of max attribute.

Parameters:

maximum - new value of max attribute

See Also:

getMaximum()

getStep

public java.lang.Integer getStep()

Gets value of step attribute.

Returns:

value of step attribute

See Also:

setStep(java.lang.Integer)

setStep

public void setStep(java.lang.Integer step)

Sets new value of step attribute.

Parameters:

step - new value of step attribute

See Also:

getStep()

getSeedAttributeValue

protected java.lang.Long getSeedAttributeValue()

Description copied from class: RandomExpression

Gets value of seed attribute.

Specified by:

getSeedAttributeValue in class RandomExpression

Returns:

value of seed attribute

validateAttributes

protected ValidationResult validateAttributes()

Description copied from class: AbstractNode

Validates attributes of this node.

Overrides:

validateAttributes in class AbstractNode

Returns:

result of validation

evaluateSelf

protected IntegerValue evaluateSelf(int depth)

Description copied from class: AbstractExpression

Evaluates this expression. All children must be already evaluated. Contains no checks.

Specified by:

evaluateSelf in class AbstractExpression

Parameters:

depth - depth of this expression in expression tree (root's depth = 0)

Returns:

result of evaluation

isVariable

public boolean isVariable()

Description copied from interface: Expression

Returns true if value of evaluation can change every evaluation call; false otherwise. It checks this expression and all of its children (if any child is variable, this expression becomes variable too). Example of variable expressions: variable and outcome expressions.

Specified by:

isVariable in interface Expression

Overrides:

isVariable in class AbstractExpression

Returns:

true if value of evaluation can change every evaluation call; false otherwise