org.javarosa.core.model.instance

Class TreeElement

java.lang.Object

org.javarosa.core.model.instance.TreeElement

All Implemented Interfaces:

AbstractTreeElement<TreeElement>, Externalizable

public class TreeElement
extends Object
implements Externalizable, AbstractTreeElement<TreeElement>

An element of a FormInstance.

TreeElements represent an XML node in the instance. It may either have a value (e.g., Drew), a number of TreeElement children (e.g., ), or neither (e.g.,)

TreeElements can also represent attributes. Attributes are unique from normal elements in that they are not "children" of their parent, and are always leaf nodes: IE cannot have children.

TODO: Split out the bind-able session data from this class and leave only the mandatory values to speed up new DOM-like models

Author:

Clayton Sims

Field Summary

Fields

Modifier and Type	Field and Description
protected int	dataType
protected int	multiplicity

Constructor Summary

Constructors

Constructor and Description
TreeElement() TreeElement with null name and 0 multiplicity? (a "hidden root" node?)
TreeElement(String name)
TreeElement(String name, int multiplicity)

Method Summary

Modifier and Type	Method and Description
void	accept(ITreeVisitor visitor) Visitor pattern acceptance method.
void	addChild(TreeElement child)
void	alertStateObservers(int changeFlags)
static TreeReference	BuildRef(AbstractTreeElement elem)
static int	CalculateDepth(AbstractTreeElement elem)
void	clearCaches()
void	clearChildrenCaches()
static TreeElement	constructAttributeElement(String namespace, String name, String value) Construct a TreeElement which represents an attribute with the provided namespace and name.
TreeElement	deepCopy(boolean includeTemplates)
static TreeElement	getAttribute(List<TreeElement> attributes, String namespace, String name) Retrieves the TreeElement representing the attribute for the provided namespace and name, or null if none exists.
TreeElement	getAttribute(String namespace, String name) Retrieves the TreeElement representing the attribute at the provided namespace and name, or null if none exists.
int	getAttributeCount() Returns the number of attributes of this element.
String	getAttributeName(int index) get name of attribute at 'index' in the list
String	getAttributeNamespace(int index) get namespace of attribute at 'index' in the list
String	getAttributeValue()
String	getAttributeValue(int index) get value of attribute at 'index' in the list
String	getAttributeValue(String namespace, String name) get value of attribute with namespace:name' in the list
TreeElement	getBindAttribute(String namespace, String name) Retrieves the TreeElement representing an arbitrary bind attribute for this element at the provided namespace and name, or null if none exists.
List<TreeElement>	getBindAttributes()
String	getBindAttributeValue(String namespace, String name) Returns the value of the given bind attribute from the given namespace.
TreeElement	getChild(String name, int multiplicity)
TreeElement	getChildAt(int i)
int	getChildMultiplicity(String name)
List<TreeElement>	getChildrenWithName(String name) Get all the child nodes of this element, with specific name
Constraint	getConstraint()
int	getDataType()
int	getDepth()
String	getInstanceName()
int	getMult()
int	getMultiplicity()
String	getName()
String	getNamespace()
String	getNamespacePrefix()
int	getNumChildren()
AbstractTreeElement	getParent()
String	getPreloadHandler()
String	getPreloadParams()
TreeReference	getRef()
IAnswerData	getValue()
boolean	hasChildren()
boolean	isAttribute()
boolean	isChildable()
boolean	isEnabled()
boolean	isLeaf()
boolean	isRelevant()
boolean	isRepeatable()
boolean	isRequired()
void	populate(TreeElement incoming, FormDef f)
void	populateTemplate(TreeElement incoming, FormDef f)
void	readExternal(DataInputStream in, PrototypeFactory pf)
void	registerStateObserver(FormElementStateListener qsl)
void	removeChild(String name, int multiplicity)
void	removeChild(TreeElement child)
void	removeChildAt(int i)
void	removeChildren(String name)
boolean	setAnswer(IAnswerData answer)
void	setAttribute(String namespace, String name, String value)
static void	setAttribute(TreeElement parent, List<TreeElement> attrs, String namespace, String name, String value)
void	setBindAttribute(String namespace, String name, String value)
void	setBindAttributes(List<TreeElement> bindAttributes)
void	setConstraint(Constraint constraint)
void	setDataType(int dataType)
void	setEnabled(boolean enabled)
void	setEnabled(boolean enabled, boolean inherited)
void	setInstanceName(String instanceName)
void	setMult(int multiplicity)
void	setName(String name)
void	setNamespace(String namespace)
void	setNamespacePrefix(String namespacePrefix)
void	setParent(AbstractTreeElement parent)
void	setPreloadHandler(String preloadHandler)
void	setPreloadParams(String preloadParams)
void	setRelevant(boolean relevant)
void	setRepeatable(boolean repeatable)
void	setRequired(boolean required)
void	setValue(IAnswerData value)
TreeElement	shallowCopy()
String	toString()
List<TreeReference>	tryBatchChildFetch(String name, int mult, List<XPathExpression> predicates, EvaluationContext evalContext) TODO: Worst method name ever.
void	unregisterAll()
void	unregisterStateObserver(FormElementStateListener qsl)
void	writeExternal(DataOutputStream out)

Methods inherited from class java.lang.Object

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

Field Detail

multiplicity

protected int multiplicity

dataType

protected int dataType

Constructor Detail

TreeElement

public TreeElement()

TreeElement with null name and 0 multiplicity? (a "hidden root" node?)

TreeElement

public TreeElement(String name)

TreeElement

public TreeElement(String name,
                   int multiplicity)

Method Detail

constructAttributeElement

public static TreeElement constructAttributeElement(String namespace,
                                                    String name,
                                                    String value)

Construct a TreeElement which represents an attribute with the provided namespace and name.

Parameters:

namespace - - if null will be converted to empty string

name -

value -

Returns:

A new instance of a TreeElement

getAttribute

public static TreeElement getAttribute(List<TreeElement> attributes,
                                       String namespace,
                                       String name)

Retrieves the TreeElement representing the attribute for the provided namespace and name, or null if none exists.

If 'null' is provided for the namespace, it will match the first attribute with the matching name.

Parameters:

attributes - - list of attributes to search

namespace -

name -

Returns:

TreeElement

setAttribute

public static void setAttribute(TreeElement parent,
                                List<TreeElement> attrs,
                                String namespace,
                                String name,
                                String value)

isLeaf

public boolean isLeaf()

Specified by:

isLeaf in interface AbstractTreeElement<TreeElement>

isChildable

public boolean isChildable()

Specified by:

isChildable in interface AbstractTreeElement<TreeElement>

getInstanceName

public String getInstanceName()

Specified by:

getInstanceName in interface AbstractTreeElement<TreeElement>

setInstanceName

public void setInstanceName(String instanceName)

setValue

public void setValue(IAnswerData value)

getChild

public TreeElement getChild(String name,
                            int multiplicity)

Specified by:

getChild in interface AbstractTreeElement<TreeElement>

getChildrenWithName

public List<TreeElement> getChildrenWithName(String name)

Description copied from interface: AbstractTreeElement

Get all the child nodes of this element, with specific name

Specified by:

getChildrenWithName in interface AbstractTreeElement<TreeElement>

Returns:

getNumChildren

public int getNumChildren()

Specified by:

getNumChildren in interface AbstractTreeElement<TreeElement>

hasChildren

public boolean hasChildren()

Specified by:

hasChildren in interface AbstractTreeElement<TreeElement>

getChildAt

public TreeElement getChildAt(int i)

Specified by:

getChildAt in interface AbstractTreeElement<TreeElement>

isRepeatable

public boolean isRepeatable()

Specified by:

isRepeatable in interface AbstractTreeElement<TreeElement>

isAttribute

public boolean isAttribute()

Specified by:

isAttribute in interface AbstractTreeElement<TreeElement>

setDataType

public void setDataType(int dataType)

addChild

public void addChild(TreeElement child)

removeChild

public void removeChild(TreeElement child)

removeChild

public void removeChild(String name,
                        int multiplicity)

removeChildren

public void removeChildren(String name)

removeChildAt

public void removeChildAt(int i)

getChildMultiplicity

public int getChildMultiplicity(String name)

Specified by:

getChildMultiplicity in interface AbstractTreeElement<TreeElement>

shallowCopy

public TreeElement shallowCopy()

deepCopy

public TreeElement deepCopy(boolean includeTemplates)

isRelevant

public boolean isRelevant()

Specified by:

isRelevant in interface AbstractTreeElement<TreeElement>

isEnabled

public boolean isEnabled()

setAnswer

public boolean setAnswer(IAnswerData answer)

setRequired

public void setRequired(boolean required)

setRelevant

public void setRelevant(boolean relevant)

setBindAttributes

public void setBindAttributes(List<TreeElement> bindAttributes)

getBindAttributes

public List<TreeElement> getBindAttributes()

getBindAttribute

public TreeElement getBindAttribute(String namespace,
                                    String name)

Retrieves the TreeElement representing an arbitrary bind attribute for this element at the provided namespace and name, or null if none exists.

If 'null' is provided for the namespace, it will match the first attribute with the matching name.

Returns:

TreeElement

getBindAttributeValue

public String getBindAttributeValue(String namespace,
                                    String name)

Returns the value of the given bind attribute from the given namespace.

Example:

• Given a binding <bind assertion="blah"/>, calling getBindAttributeValue(null, "assertion") will return "blah"
• Given a binding <bind odk:assertion="blah"/>, calling getBindAttributeValue("odk", "assertion") will return "blah"

Parameters:

namespace - the namespace of the attribute. It can be null

name - the name of the attribute

setBindAttribute

public void setBindAttribute(String namespace,
                             String name,
                             String value)

setEnabled

public void setEnabled(boolean enabled)

setEnabled

public void setEnabled(boolean enabled,
                       boolean inherited)

registerStateObserver

public void registerStateObserver(FormElementStateListener qsl)

unregisterStateObserver

public void unregisterStateObserver(FormElementStateListener qsl)

unregisterAll

public void unregisterAll()

alertStateObservers

public void alertStateObservers(int changeFlags)

accept

public void accept(ITreeVisitor visitor)

Description copied from interface: AbstractTreeElement

Visitor pattern acceptance method.

Specified by:

accept in interface AbstractTreeElement<TreeElement>

Parameters:

visitor - The visitor traveling this tree

getAttributeCount

public int getAttributeCount()

Description copied from interface: AbstractTreeElement

Returns the number of attributes of this element.

Specified by:

getAttributeCount in interface AbstractTreeElement<TreeElement>

getAttributeNamespace

public String getAttributeNamespace(int index)

Description copied from interface: AbstractTreeElement

get namespace of attribute at 'index' in the list

Specified by:

getAttributeNamespace in interface AbstractTreeElement<TreeElement>

Returns:

String

getAttributeName

public String getAttributeName(int index)

Description copied from interface: AbstractTreeElement

get name of attribute at 'index' in the list

Specified by:

getAttributeName in interface AbstractTreeElement<TreeElement>

Returns:

String

getAttributeValue

public String getAttributeValue(int index)

Description copied from interface: AbstractTreeElement

get value of attribute at 'index' in the list

Specified by:

getAttributeValue in interface AbstractTreeElement<TreeElement>

Returns:

String

getAttributeValue

public String getAttributeValue()

getAttribute

public TreeElement getAttribute(String namespace,
                                String name)

Description copied from interface: AbstractTreeElement

Retrieves the TreeElement representing the attribute at the provided namespace and name, or null if none exists. If 'null' is provided for the namespace, it will match the first attribute with the matching name.

Specified by:

getAttribute in interface AbstractTreeElement<TreeElement>

Returns:

TreeElement

getAttributeValue

public String getAttributeValue(String namespace,
                                String name)

Description copied from interface: AbstractTreeElement

get value of attribute with namespace:name' in the list

Specified by:

getAttributeValue in interface AbstractTreeElement<TreeElement>

Returns:

String

setAttribute

public void setAttribute(String namespace,
                         String name,
                         String value)

readExternal

public void readExternal(DataInputStream in,
                         PrototypeFactory pf)
                  throws IOException,
                         DeserializationException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

DeserializationException

writeExternal

public void writeExternal(DataOutputStream out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

populate

public void populate(TreeElement incoming,
                     FormDef f)

populateTemplate

public void populateTemplate(TreeElement incoming,
                             FormDef f)

getRef

public TreeReference getRef()

Specified by:

getRef in interface AbstractTreeElement<TreeElement>

BuildRef

public static TreeReference BuildRef(AbstractTreeElement elem)

getDepth

public int getDepth()

Specified by:

getDepth in interface AbstractTreeElement<TreeElement>

CalculateDepth

public static int CalculateDepth(AbstractTreeElement elem)

getPreloadHandler

public String getPreloadHandler()

getConstraint

public Constraint getConstraint()

setPreloadHandler

public void setPreloadHandler(String preloadHandler)

setConstraint

public void setConstraint(Constraint constraint)

getPreloadParams

public String getPreloadParams()

setPreloadParams

public void setPreloadParams(String preloadParams)

getName

public String getName()

Specified by:

getName in interface AbstractTreeElement<TreeElement>

setName

public void setName(String name)

getMult

public int getMult()

Specified by:

getMult in interface AbstractTreeElement<TreeElement>

setMult

public void setMult(int multiplicity)

setParent

public void setParent(AbstractTreeElement parent)

getParent

public AbstractTreeElement getParent()

Specified by:

getParent in interface AbstractTreeElement<TreeElement>

getValue

public IAnswerData getValue()

Specified by:

getValue in interface AbstractTreeElement<TreeElement>

toString

public String toString()

Overrides:

toString in class Object

getDataType

public int getDataType()

Specified by:

getDataType in interface AbstractTreeElement<TreeElement>

isRequired

public boolean isRequired()

setRepeatable

public void setRepeatable(boolean repeatable)

getMultiplicity

public int getMultiplicity()

clearCaches

public void clearCaches()

Specified by:

clearCaches in interface AbstractTreeElement<TreeElement>

clearChildrenCaches

public void clearChildrenCaches()

getNamespace

public String getNamespace()

Specified by:

getNamespace in interface AbstractTreeElement<TreeElement>

setNamespace

public void setNamespace(String namespace)

tryBatchChildFetch

public List<TreeReference> tryBatchChildFetch(String name,
                                              int mult,
                                              List<XPathExpression> predicates,
                                              EvaluationContext evalContext)

Description copied from interface: AbstractTreeElement

TODO: Worst method name ever. Don't use this unless you know what's up.

Specified by:

tryBatchChildFetch in interface AbstractTreeElement<TreeElement>

predicates - possibly list of predicates to be evaluated. predicates will be removed from list if they are able to be evaluated

Returns:

getNamespacePrefix

public String getNamespacePrefix()

setNamespacePrefix

public void setNamespacePrefix(String namespacePrefix)