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

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

All Implemented Interfaces:

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

public class BaseValue
extends AbstractExpression

The simplest expression returns A single value from the set defined by the given baseType.

Added optional attribute identifier.

Author:

Jiri Kajaba

See Also:

Cardinality, BaseType, Serialized Form

Field Summary

static java.lang.String	ATTR_BASE_TYPE_NAME Name of baseType 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

BaseValue(ExpressionParent parent)
Constructs expression.

Method Summary

protected java.lang.String	bodyToXmlString(int depth, boolean printDefaultAttributes) Prints body (children and/or text content) of this node into xml string.
protected SingleValue	evaluateSelf(int depth) Evaluates this expression.
BaseType	getBaseTypeAttrValue() Gets value of baseType attribute.
java.lang.String	getClassTag() Gets QTI class name of this node.
BaseType[]	getProducedBaseTypes() Gets list of all possible produced baseTypes after evaluation (possible baseTypes of evaluated result).
java.lang.String	getSimpleName() Gets simple name of this node.
SingleValue	getSingleValue() Gets single value of this baseValue.
protected void	readChildren(org.w3c.dom.Node node) Reads all children nodes and/or content from given xml source.
void	setBaseTypeAttrValue(BaseType baseType) Sets new value of baseType attribute.
void	setSingleValue(SingleValue singleValue) Sets new single value of this baseValue.
java.lang.String	toString()
protected ValidationResult	validateChildren() Validates children (body) of this node.

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

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

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

getParentItem, getParentResult, getParentTest, setParent

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

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

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, 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_BASE_TYPE_NAME

public static final java.lang.String ATTR_BASE_TYPE_NAME

Name of baseType attribute in xml schema.

See Also:

Constant Field Values

Constructor Detail

BaseValue

public BaseValue(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

getSimpleName

public java.lang.String getSimpleName()

Description copied from interface: XmlNode

Gets simple name of this node. Simple name contains QTI class name and some additional information to help identify node (if these informations are available).

Simple name is not so important like QTI class name. It servers mostly for displaying informations and in messages.

For example: simple name can be assessmentTest:Test (QTI class name (assessmentTest) + identifier (Test)).

Specified by:

getSimpleName in interface XmlNode

Overrides:

getSimpleName in class AbstractNode

Returns:

simple name of this node

See Also:

XmlNode.getFullName()

getBaseTypeAttrValue

public BaseType getBaseTypeAttrValue()

Gets value of baseType attribute.

Returns:

value of baseType attribute

See Also:

setBaseTypeAttrValue(org.qtitools.qti.value.BaseType)

setBaseTypeAttrValue

public void setBaseTypeAttrValue(BaseType baseType)

Sets new value of baseType attribute.

Parameters:

baseType - new value of baseType attribute.

See Also:

getBaseTypeAttrValue()

getSingleValue

public SingleValue getSingleValue()

Gets single value of this baseValue.

Returns:

single value of this baseValue

See Also:

setSingleValue(org.qtitools.qti.value.SingleValue)

setSingleValue

public void setSingleValue(SingleValue singleValue)

Sets new single value of this baseValue.

Parameters:

singleValue - new single value of this baseValue

See Also:

getSingleValue()

readChildren

protected void readChildren(org.w3c.dom.Node node)

Description copied from class: AbstractNode

Reads all children nodes and/or content from given xml source. Every subclass must implement its own children nodes and/or content reading. If there are no children nodes and content do nothing (you don't even need to override this method).

Overrides:

readChildren in class AbstractNode

Parameters:

node - xml source

bodyToXmlString

protected java.lang.String bodyToXmlString(int depth,
                                           boolean printDefaultAttributes)

Description copied from class: AbstractNode

Prints body (children and/or text content) of this node into xml string.

Overrides:

bodyToXmlString in class AbstractNode

Parameters:

depth - depth in xml tree (root = 0)

printDefaultAttributes - whether print attributes with default values

Returns:

xml string with printed body (children and/or text content) of this node

getProducedBaseTypes

public BaseType[] getProducedBaseTypes()

Description copied from interface: Expression

Gets list of all possible produced baseTypes after evaluation (possible baseTypes of evaluated result). Result of this method can change in time.

Static example is expression or. Expression or can produce only boolean baseType and it cannot change.

Dynamic example is expression variable. Expression variable can produce any baseType before evaluation. After evaluation it produces baseType of its result (and it can change every evaluation call!).

Null expression, empty containers (multiple, ordered, record), or NULL values produces all baseTypes. So they are compatible with anything.

Specified by:

getProducedBaseTypes in interface Expression

Overrides:

getProducedBaseTypes in class AbstractExpression

Returns:

list of all possible produced baseTypes after evaluation

validateChildren

protected ValidationResult validateChildren()

Description copied from class: AbstractNode

Validates children (body) of this node.

Overrides:

validateChildren in class AbstractNode

Returns:

result of validation

evaluateSelf

protected SingleValue 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

toString

public java.lang.String toString()

Overrides:

toString in class AbstractExpression