net.sf.saxon.ma.arrays

Class ImmutableArrayItem

java.lang.Object

net.sf.saxon.ma.arrays.AbstractArrayItem

net.sf.saxon.ma.arrays.ImmutableArrayItem

All Implemented Interfaces:

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

public class ImmutableArrayItem
extends AbstractArrayItem

Implementation of ArrayItem backed by a persistent immutable array, so that operations that "update" the array do not have to copy the whole array

Field Summary

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

SINGLE_ARRAY_TYPE

Constructor Summary

Constructors

Constructor and Description
ImmutableArrayItem(SimpleArrayItem other)

Method Summary

Modifier and Type	Method and Description
int	arrayLength() Get the number of members in the array
ArrayItem	concat(ArrayItem other) Concatenate this array with another
GroundedValue<?>	get(int index) Get a member of the array
ArrayItem	insert(int position, GroundedValue<?> member) Insert a new member into an array
boolean	isEmpty() Ask whether the array is empty
java.lang.Iterable<GroundedValue<?>>	members() Get the list of all members of the array
ArrayItem	put(int index, GroundedValue newValue) Replace a member of the array
ArrayItem	remove(int index) Remove a member from the array
ArrayItem	removeSeveral(IntSet positions) Remove zero or more members from the array
ArrayItem	subArray(int start, int end) Get a subarray given a start and end position

Methods inherited from class net.sf.saxon.ma.arrays.AbstractArrayItem

atomize, call, deepEquals, effectiveBooleanValue, export, getAnnotations, getArity, getDescription, getFunctionItemType, getFunctionName, getMemberType, getOperandRoles, getStringValue, getStringValueCS, isArray, isMap, isTrustedResultType, makeNewContext, toString

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

getGenre, toShortString

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

argumentArray

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

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

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

ImmutableArrayItem

public ImmutableArrayItem(SimpleArrayItem other)

Method Detail

get

public GroundedValue<?> get(int index)
                     throws XPathException

Get a member of the array

Parameters:

index - the position of the member to retrieve (zero-based)

Returns:

the value at the given position.

Throws:

XPathException - if the index is out of range

put

public ArrayItem put(int index,
                     GroundedValue newValue)
              throws XPathException

Replace a member of the array

Parameters:

index - the position of the member to replace (zero-based)

newValue - the replacement value

Returns:

the value at the given position.

Throws:

XPathException - if the index is out of range

insert

public ArrayItem insert(int position,
                        GroundedValue<?> member)

Insert a new member into an array

Parameters:

position - the 0-based position that the new item will assume

member - the new member to be inserted

Returns:

a new array item with the new member inserted

Throws:

java.lang.IndexOutOfBoundsException - if position is out of range

arrayLength

public int arrayLength()

Get the number of members in the array

Note: the method always returns 1, because an array is an item

Returns:

the number of members in this array.

isEmpty

public boolean isEmpty()

Ask whether the array is empty

Returns:

true if and only if the size of the array is zero

members

public java.lang.Iterable<GroundedValue<?>> members()

Get the list of all members of the array

Returns:

an iterator over the members of the array

subArray

public ArrayItem subArray(int start,
                          int end)

Get a subarray given a start and end position

Parameters:

start - the start position (zero based)

end - the end position (the position of the first item not to be returned) (zero based)

Returns:

a new array item containing the sub-array

Throws:

java.lang.IndexOutOfBoundsException - if start, or start+end, is out of range

concat

public ArrayItem concat(ArrayItem other)

Concatenate this array with another

Parameters:

other - the second array

Returns:

the concatenation of the two arrays; that is, an array containing first the members of this array, and then the members of the other array

remove

public ArrayItem remove(int index)

Remove a member from the array

Parameters:

index - the position of the member to be removed (zero-based)

Returns:

a new array in which the requested member has been removed.

Throws:

java.lang.IndexOutOfBoundsException - if index is out of range

removeSeveral

public ArrayItem removeSeveral(IntSet positions)

Remove zero or more members from the array

Parameters:

positions - the positions of the members to be removed (zero-based). A value that is out of range is ignored.

Returns:

a new array in which the requested member has been removed