org.qtitools.qti.node.expression.operator
Class RecordEx

java.lang.Object
  org.qtitools.qti.node.AbstractNode
      org.qtitools.qti.node.AbstractObject
          org.qtitools.qti.node.expression.AbstractExpression
              org.qtitools.qti.node.expression.operator.RecordEx

All Implemented Interfaces:

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

public class RecordEx
extends AbstractExpression

The record operator takes 0 or more single sub-expressions of any base-type. The result is A container with record cardinality containing the values of the sub-expressions.

All sub-expressions with NULL values are ignored. If no sub-expressions are given (or all are NULL) then the result is NULL.

This operator is not in specification, but it is needed for testing and to allow implementation of other expressions (for example fieldValue).

Author:

Jiri Kajaba

See Also:

Cardinality, BaseType, Serialized Form

Field Summary

static java.util.List<java.lang.String>	ATTR_IDENTIFIERS_DEFAULT_VALUE Default value of identifiers attribute.
static java.lang.String	ATTR_IDENTIFIERS_NAME Name of identifiers 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

RecordEx(ExpressionParent parent)
Constructs expression.

Method Summary

protected Value	evaluateSelf(int depth) Evaluates this expression.
Expression	getChild(java.lang.String identifier) Gets child of this expression with given identifier or null.
java.lang.String	getClassTag() Gets QTI class name of this node.
java.util.List<java.lang.String>	getIdentifiers() Gets value of identifiers attribute.
protected ValidationResult	validateAttributes() Validates attributes of this node.
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, 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, 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

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_IDENTIFIERS_NAME

public static final java.lang.String ATTR_IDENTIFIERS_NAME

Name of identifiers attribute in xml schema.

See Also:

Constant Field Values

ATTR_IDENTIFIERS_DEFAULT_VALUE

public static final java.util.List<java.lang.String> ATTR_IDENTIFIERS_DEFAULT_VALUE

Default value of identifiers attribute.

Constructor Detail

RecordEx

public RecordEx(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

getIdentifiers

public java.util.List<java.lang.String> getIdentifiers()

Gets value of identifiers attribute.

Returns:

value of identifiers attribute

getChild

public Expression getChild(java.lang.String identifier)

Gets child of this expression with given identifier or null. Identifier is not part of child, but this expression.

Parameters:

identifier - identifier of child

Returns:

Gets child of this expression with given name or null

validateAttributes

protected ValidationResult validateAttributes()

Description copied from class: AbstractNode

Validates attributes of this node.

Overrides:

validateAttributes in class AbstractNode

Returns:

result of validation

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 Value 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