net.sf.saxon.ma.arrays

Class ImmutableArrayItem

java.lang.Object

net.sf.saxon.ma.arrays.ArrayItem

net.sf.saxon.ma.arrays.AbstractArrayItem

net.sf.saxon.ma.arrays.ImmutableArrayItem

All Implemented Interfaces:

Callable, Function, GroundedValue, Item, Sequence

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

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, getUnicodeStringValue, isTrustedResultType, makeNewContext, toString

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

getGenre, isArray, isMap, toShortString

Methods inherited from class java.lang.Object

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

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

isSequenceVariadic

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

getLength, getStringValue, head, isStreamed, itemAt, iterate, reduce, subsequence

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

asIterable, concatenate, containsNode, materialize

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

makeRepeatable

Constructor Detail

ImmutableArrayItem

public ImmutableArrayItem(SimpleArrayItem other)

Method Detail

get

public GroundedValue get(int index)

Get a member of the array

Specified by:

get in class ArrayItem

Parameters:

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

Returns:

the value at the given position.

Throws:

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

put

public ArrayItem put(int index,
                     GroundedValue newValue)

Replace a member of the array

Specified by:

put in class ArrayItem

Parameters:

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

newValue - the replacement value

Returns:

the value at the given position.

Throws:

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

insert

public ArrayItem insert(int position,
                        GroundedValue member)

Insert a new member into an array

Specified by:

insert in class ArrayItem

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

Specified by:

arrayLength in class ArrayItem

Returns:

the number of members in this array.

isEmpty

public boolean isEmpty()

Ask whether the array is empty

Overrides:

isEmpty in class ArrayItem

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

Specified by:

members in class ArrayItem

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

Specified by:

subArray in class ArrayItem

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

Specified by:

concat in class ArrayItem

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

Specified by:

remove in class ArrayItem

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

Specified by:

removeSeveral in class ArrayItem

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