net.sf.saxon.ma.arrays

Class AbstractArrayItem

java.lang.Object

net.sf.saxon.ma.arrays.AbstractArrayItem

All Implemented Interfaces:

java.lang.Iterable<ArrayItem>, Callable, ArrayItem, Function<ArrayItem>, GroundedValue<ArrayItem>, Item<ArrayItem>, Sequence<ArrayItem>

Direct Known Subclasses:

PersistentArrayItem, SimpleArrayItem

public abstract class AbstractArrayItem
extends java.lang.Object
implements ArrayItem

An abstract implementation of XDM array items, containing methods that can be implemented generically.

Field Summary

Fields inherited from interface net.sf.saxon.ma.arrays.ArrayItem

SINGLE_ARRAY_TYPE

Constructor Summary

Constructors

Constructor and Description
AbstractArrayItem()

Method Summary

Modifier and Type	Method and Description
AtomicSequence	atomize() Atomize the item.
GroundedValue<? extends Item>	call(XPathContext context, Sequence[] args) Invoke the array in its role as a function
boolean	deepEquals(Function other, XPathContext context, AtomicComparer comparer, int flags) Test whether this array is deep-equal to another array, under the rules of the deep-equal function
boolean	effectiveBooleanValue() Get the effective boolean value of this sequence
void	export(ExpressionPresenter out) Output information about this function item to the diagnostic explain() output
AnnotationList	getAnnotations() Get the function annotations (as defined in XQuery).
int	getArity() Get the arity of the function
java.lang.String	getDescription() Get a description of this function for use in error messages.
FunctionItemType	getFunctionItemType() Get the item type of the function item
StructuredQName	getFunctionName() Get the name of the function, or null if it is anonymous
SequenceType	getMemberType(TypeHierarchy th) Get the lowest common item type of the members of the array
OperandRole[]	getOperandRoles() Get the roles of the arguments, for the purposes of streaming
java.lang.String	getStringValue() Get the value of the item as a string.
java.lang.CharSequence	getStringValueCS() Get the value of the item as a CharSequence.
boolean	isArray() Ask whether this function item is an array
boolean	isMap() Ask whether this function item is a map
boolean	isTrustedResultType() Check that result type is of the trusted system functions to return a result of the correct type
XPathContext	makeNewContext(XPathContext callingContext) Prepare an XPathContext object for evaluating the function
java.lang.String	toString() Output a string representation of the array, suitable for diagnostics

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saxon.ma.arrays.ArrayItem

arrayLength, concat, get, getGenre, insert, isEmpty, members, put, remove, removeSeveral, subArray, toShortString

Methods inherited from interface net.sf.saxon.om.Function

argumentArray

Methods inherited from interface net.sf.saxon.om.Item

asArgumentArray, getLength, head, isStreamed, itemAt, iterate, iterator, reduce, subsequence

Methods inherited from interface net.sf.saxon.om.GroundedValue

asIterable, materialize

Methods inherited from interface net.sf.saxon.om.Sequence

makeRepeatable

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

AbstractArrayItem

public AbstractArrayItem()

Method Detail

getOperandRoles

public OperandRole[] getOperandRoles()

Get the roles of the arguments, for the purposes of streaming

Specified by:

getOperandRoles in interface Function<ArrayItem>

Returns:

an array of OperandRole objects, one for each argument

isArray

public boolean isArray()

Ask whether this function item is an array

Specified by:

isArray in interface Function<ArrayItem>

Returns:

true (it is an array)

isMap

public boolean isMap()

Ask whether this function item is a map

Specified by:

isMap in interface Function<ArrayItem>

Returns:

false (it is not a map)

atomize

public AtomicSequence atomize()
                       throws XPathException

Atomize the item.

Specified by:

atomize in interface Item<ArrayItem>

Returns:

the result of atomization

Throws:

XPathException - if atomization is not allowed for this kind of item

getAnnotations

public AnnotationList getAnnotations()

Get the function annotations (as defined in XQuery). Returns an empty list if there are no function annotations.

Specified by:

getAnnotations in interface Function<ArrayItem>

Returns:

the function annotations

getFunctionItemType

public FunctionItemType getFunctionItemType()

Get the item type of the function item

Specified by:

getFunctionItemType in interface Function<ArrayItem>

Returns:

the function item's type

getFunctionName

public StructuredQName getFunctionName()

Get the name of the function, or null if it is anonymous

Specified by:

getFunctionName in interface Function<ArrayItem>

Returns:

the function name, or null for an anonymous function (which this one is)

getDescription

public java.lang.String getDescription()

Get a description of this function for use in error messages. For named functions, the description is the function name (as a lexical QName). For others, it might be, for example, "inline function", or "partially-applied ends-with function".

Specified by:

getDescription in interface Function<ArrayItem>

Returns:

a description of the function for use in error messages

getArity

public int getArity()

Get the arity of the function

Specified by:

getArity in interface Function<ArrayItem>

Returns:

the number of arguments in the function signature (in this case, 1 (one))

makeNewContext

public XPathContext makeNewContext(XPathContext callingContext)

Prepare an XPathContext object for evaluating the function

Specified by:

makeNewContext in interface Function<ArrayItem>

Parameters:

callingContext - the XPathContext of the function calling expression

Returns:

a suitable context for evaluating the function (which may or may not be the same as the caller's context)

call

public GroundedValue<? extends Item> call(XPathContext context,
                                          Sequence[] args)
                                   throws XPathException

Invoke the array in its role as a function

Specified by:

call in interface Callable

Specified by:

call in interface Function<ArrayItem>

Parameters:

context - the XPath dynamic evaluation context

args - the actual arguments to be supplied (a single integer)

Returns:

the result of invoking the function

Throws:

XPathException - if a dynamic error occurs within the function

deepEquals

public boolean deepEquals(Function other,
                          XPathContext context,
                          AtomicComparer comparer,
                          int flags)
                   throws XPathException

Test whether this array is deep-equal to another array, under the rules of the deep-equal function

Specified by:

deepEquals in interface Function<ArrayItem>

Parameters:

other - the other function item

context - the dynamic evaluation context

comparer - the object to perform the comparison

flags - options for how the comparison is performed

Returns:

true if the two array items are deep-equal; false if they are not deep equal or if the other item is not an array

Throws:

XPathException - if the comparison cannot be performed

effectiveBooleanValue

public boolean effectiveBooleanValue()
                              throws XPathException

Get the effective boolean value of this sequence

Specified by:

effectiveBooleanValue in interface GroundedValue<ArrayItem>

Returns:

the effective boolean value

Throws:

XPathException - if the sequence has no effective boolean value (for example a sequence of two integers)

getStringValue

public java.lang.String getStringValue()

Get the value of the item as a string. For arrays, there is no string value, so an exception is thrown.

Specified by:

getStringValue in interface GroundedValue<ArrayItem>

Specified by:

getStringValue in interface Item<ArrayItem>

Returns:

the string value of the item

Throws:

java.lang.UnsupportedOperationException - if the item is an array (an unchecked exception is used here to avoid introducing exception handling to a large number of paths where it is not needed)

Since:

8.4

See Also:

getStringValueCS()

getStringValueCS

public java.lang.CharSequence getStringValueCS()

Get the value of the item as a CharSequence. For arrays, there is no string value, so an exception is thrown.

Specified by:

getStringValueCS in interface GroundedValue<ArrayItem>

Specified by:

getStringValueCS in interface Item<ArrayItem>

Returns:

the string value of the item

Throws:

java.lang.UnsupportedOperationException - if the item is an array (an unchecked exception is used here to avoid introducing exception handling to a large number of paths where it is not needed)

Since:

8.4

See Also:

getStringValueCS()

export

public void export(ExpressionPresenter out)
            throws XPathException

Output information about this function item to the diagnostic explain() output

Specified by:

export in interface Function<ArrayItem>

Throws:

XPathException

isTrustedResultType

public boolean isTrustedResultType()

Description copied from interface: Function

Check that result type is of the trusted system functions to return a result of the correct type

Specified by:

isTrustedResultType in interface Function<ArrayItem>

toString

public java.lang.String toString()

Output a string representation of the array, suitable for diagnostics

Overrides:

toString in class java.lang.Object

getMemberType

public SequenceType getMemberType(TypeHierarchy th)

Get the lowest common item type of the members of the array

Specified by:

getMemberType in interface ArrayItem

Returns:

the most specific type to which all the members belong.