org.qtitools.qti.node.expression
Class RandomExpression

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

All Implemented Interfaces:

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

Direct Known Subclasses:

Random, RandomFloat, RandomInteger

public abstract class RandomExpression
extends AbstractExpression

Parent of all expressions with random values.

Author:

Jiri Kajaba

See Also:

Serialized Form

Field Summary

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

RandomExpression(ExpressionParent parent)
Constructs expression.

Method Summary

protected java.util.Random	getRandomGenerator(int depth) Gets a random number generator.
protected abstract java.lang.Long	getSeedAttributeValue() Gets value of seed attribute.

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

evaluate, evaluateSelf, getBaseType, getCardinality, getChildren, getFirstChild, getParent, getParentRequiredBaseTypes, getParentRequiredCardinalities, getProducedBaseTypes, getProducedCardinalities, getProducedNumericalBaseTypes, getRequiredBaseTypes, getRequiredCardinalities, getRequiredSameBaseTypes, getRequiredSameCardinalities, getSecondChild, getType, getValue, isAnyChildNull, isNull, isVariable, 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, getClassTag, 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, validateAttributes, 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, getClassTag, getFullName, getNodeGroups, getParentRoot, getSimpleName, getSourceFile, getSourceNode, getSourceString, getSourceUrl, hasChildNodes, load, load, load, load, setSourceFile, setSourceNode, setSourceString, setSourceUrl, toXmlString, toXmlString

Constructor Detail

RandomExpression

public RandomExpression(ExpressionParent parent)

Constructs expression.

Parameters:

parent - parent of this expression

Method Detail

getSeedAttributeValue

protected abstract java.lang.Long getSeedAttributeValue()

Gets value of seed attribute.

Returns:

value of seed attribute

getRandomGenerator

protected java.util.Random getRandomGenerator(int depth)

Gets a random number generator. Generator will be created with seed if provided, otherwise the default generator is returned

Parameters:

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