Package gnu.lists

Class LList

java.lang.Object

gnu.lists.AbstractSequence<Object>

gnu.lists.ExtSequence<Object>

gnu.lists.LList

All Implemented Interfaces:

BoundedHashable, Consumable, Sequence<Object>, Externalizable, Serializable, Comparable, Iterable<Object>, Collection<Object>, List<Object>, SequencedCollection<Object>

Direct Known Subclasses:

EmptyList, Pair

public class LList
extends ExtSequence<Object>
implements Sequence<Object>, Externalizable, Comparable

Semi-abstract class for traditions Lisp-style lists. A list is implemented as a chain of Pair objects, where the 'car' field of the Pair points to a data element, and the 'cdr' field points to the next Pair. (The names 'car' and 'cdr' are historical; they refer to hardware on machines form the 60's.) Includes singleton static Empty, and the Pair sub-class.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final EmptyList	Empty

Fields inherited from class gnu.lists.AbstractSequence

noInts

Fields inherited from interface gnu.lists.Sequence

ATTRIBUTE_VALUE, BOOLEAN_VALUE, CDATA_VALUE, CHAR_VALUE, COMMENT_VALUE, DOCUMENT_VALUE, DOUBLE_VALUE, ELEMENT_VALUE, EOF_VALUE, eofValue, FLOAT_VALUE, INT_S16_VALUE, INT_S32_VALUE, INT_S64_VALUE, INT_S8_VALUE, INT_U16_VALUE, INT_U32_VALUE, INT_U64_VALUE, INT_U8_VALUE, OBJECT_VALUE, PRIM_VALUE, PROCESSING_INSTRUCTION_VALUE, TEXT_BYTE_VALUE

Constructor Summary

Constructors

Constructor	Description
LList()	Do not use - only public for serialization!

Method Summary

Modifier and Type	Method	Description
int	boundedHash(int seed, int limit)	Calculate a hash code for this object.
static Pair	chain1(Pair old, Object arg1)	Utility function used by compiler when inlining `list'.
static Pair	chain4(Pair old, Object arg1, Object arg2, Object arg3, Object arg4)	Utility function used by compiler when inlining `list'.
static Object	checkNonList(Object rest)	Helper to protect against pathological LLists (neithr Pair nor Empty).
int	compareTo(Object obj)
void	consume(Consumer out)
static Object	consX(Object[] args)	SRFI-1's cons* and Common Lisp's list* function.
int	createPos(int index, boolean isAfter)	Generate a position at a given index.
int	createRelativePos(int pos, int delta, boolean isAfter)
boolean	equals(Object obj)
Object	get(int index)	See java.util.List.
SeqPosition	getIterator(int index)
Object	getPosNext(int ipos)	Get the element following the specified position.
Object	getPosPrevious(int ipos)	Get the element before the specified position.
int	hashCode()
boolean	hasNext(int ipos)
boolean	isEmpty()	True is this sequence contains no elements.
static final int	length(Object arg)
static Pair	list1(Object arg1)
static Pair	list2(Object arg1, Object arg2)
static Pair	list3(Object arg1, Object arg2, Object arg3)
static Pair	list4(Object arg1, Object arg2, Object arg3, Object arg4)
static int	listLength(Object obj, boolean allowOtherSequence)	A safe function to count the length of a list.
static LList	makeList(Object[] vals, int offset)
static LList	makeList(Object[] vals, int offset, int length)
static LList	makeList(List vals)
int	nextPos(int ipos)	Return the next position following the argument.
void	readExternal(ObjectInput in)
Object	readResolve()
static LList	reverseInPlace(Object list)	Reverse a list in place, by modifying the cdr fields.
protected void	setPosNext(int ipos, Object value)
protected void	setPosPrevious(int ipos, Object value)
int	size()	See java.util.List.
String	toString()
void	writeExternal(ObjectOutput out)

Methods inherited from class gnu.lists.ExtSequence

copyPos, isAfterPos, nextIndex, releasePos

Methods inherited from class gnu.lists.AbstractSequence

add, add, addAll, addAll, addPos, asImmutable, badRank, checkCanWrite, checkRank, clear, compare, compare, compare, consume, consumeNext, consumePosRange, contains, containsAll, effectiveIndex, effectiveIndex, effectiveIndex, effectiveIndex, effectiveIndex, elements, endPos, equals, fill, fill, fillPosRange, firstAttributePos, firstChildPos, firstChildPos, fromEndIndex, get, get, get, get, getAttribute, getAttributeLength, getBooleanRaw, getByteRaw, getCharRaw, getContainingSequenceSize, getDoubleRaw, getElementKind, getFloatRaw, getIndexDifference, getInt, getInt, getInt, getInt, getInt, getIntRaw, getIterator, getIteratorAtPos, getLongRaw, getLowBound, getNextKind, getNextTypeName, getNextTypeObject, getRaw, getRowMajor, getShortRaw, getSize, getSize, gotoAttributesStart, gotoChildrenStart, gotoParent, hasPrevious, indexOf, iterator, lastIndexOf, listIterator, listIterator, nextIndex, nextMatching, parentPos, previousPos, rank, remove, remove, removeAll, removePos, removePosRange, retainAll, set, set, setAt, setBuffer, setRaw, stableCompare, startPos, subList, subSequence, subSequencePos, toArray, toArray, toString, unsupported, unsupportedException

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.List

add, add, addAll, addAll, addFirst, addLast, clear, contains, containsAll, getFirst, getLast, indexOf, iterator, lastIndexOf, listIterator, listIterator, remove, remove, removeAll, removeFirst, removeLast, replaceAll, retainAll, reversed, sort, spliterator, subList, toArray, toArray

Methods inherited from interface gnu.lists.Sequence

elements, fill, getInt, set

Field Details

Empty

public static final EmptyList Empty

Constructor Details

LList

public LList()

Do not use - only public for serialization!

Method Details

listLength

public static int listLength(Object obj,
 boolean allowOtherSequence)

A safe function to count the length of a list.

Parameters:

obj - the putative list to measure

allowOtherSequence - if a non-List Sequence is seen, allow that

Returns:

the length, or -1 for a circular list, or -2 for a dotted list

equals

public boolean equals(Object obj)

Specified by:

equals in interface Collection<Object>

Specified by:

equals in interface List<Object>

Overrides:

equals in class AbstractSequence<Object>

compareTo

public int compareTo(Object obj)

Specified by:

compareTo in interface Comparable

size

public int size()

Description copied from interface: Sequence

See java.util.List.

Specified by:

size in interface Collection<Object>

Specified by:

size in interface List<Object>

Specified by:

size in interface Sequence<Object>

Overrides:

size in class AbstractSequence<Object>

isEmpty

public boolean isEmpty()

Description copied from interface: Sequence

True is this sequence contains no elements.

Specified by:

isEmpty in interface Collection<Object>

Specified by:

isEmpty in interface List<Object>

Specified by:

isEmpty in interface Sequence<Object>

Overrides:

isEmpty in class AbstractSequence<Object>

getIterator

public SeqPosition getIterator(int index)

Overrides:

getIterator in class AbstractSequence<Object>

createPos

public int createPos(int index,
 boolean isAfter)

Description copied from class: AbstractSequence

Generate a position at a given index. The result is a position cookie that must be free'd with releasePos.

Overrides:

createPos in class AbstractSequence<Object>

Parameters:

index - offset from beginning of desired position

isAfter - should the position have the isAfter property

createRelativePos

public int createRelativePos(int pos,
 int delta,
 boolean isAfter)

Overrides:

createRelativePos in class AbstractSequence<Object>

hasNext

public boolean hasNext(int ipos)

Overrides:

hasNext in class AbstractSequence<Object>

nextPos

public int nextPos(int ipos)

Description copied from class: AbstractSequence

Return the next position following the argument. The new position has the isAfter property. The argument is implicitly released (as in releasePos). Returns 0 if we are already at end of file.

Overrides:

nextPos in class AbstractSequence<Object>

getPosNext

public Object getPosNext(int ipos)

Description copied from class: AbstractSequence

Get the element following the specified position.

Overrides:

getPosNext in class AbstractSequence<Object>

Parameters:

ipos - the specified position.

Returns:

the following element, or eofValue if there is none. Called by SeqPosition.getNext. FIXME Should change eof handling so return type can be E.

getPosPrevious

public Object getPosPrevious(int ipos)

Description copied from class: AbstractSequence

Get the element before the specified position.

Overrides:

getPosPrevious in class AbstractSequence<Object>

Parameters:

ipos - the specified position.

Returns:

the following element, or eofValue if there is none. FIXME Should change eof handling so return type can be E.

setPosNext

protected void setPosNext(int ipos,
 Object value)

Overrides:

setPosNext in class AbstractSequence<Object>

setPosPrevious

protected void setPosPrevious(int ipos,
 Object value)

Overrides:

setPosPrevious in class AbstractSequence<Object>

get

public Object get(int index)

Description copied from interface: Sequence

See java.util.List.

Specified by:

get in interface List<Object>

Specified by:

get in interface Sequence<Object>

Overrides:

get in class AbstractSequence<Object>

length

public static final int length(Object arg)

boundedHash

public int boundedHash(int seed,
 int limit)

Description copied from interface: BoundedHashable

Calculate a hash code for this object.

Specified by:

boundedHash in interface BoundedHashable

Overrides:

boundedHash in class AbstractSequence<Object>

Parameters:

seed - The seed is an initial value, or the accumulated hash code from previous elements in a containing object. Using zero as the seed is fine.

limit - A limit on the number of sub-elements whose hash we should calculate. This guards against cycles. Any recursive calls should be done with a smaller value of limit, and no recursive calls must be done when the limit is zero.

Returns:

A well-dispersed hash code. The result is not compatible with Object#hashCode.

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection<Object>

Specified by:

hashCode in interface List<Object>

Overrides:

hashCode in class AbstractSequence<Object>

makeList

public static LList makeList(List vals)

makeList

public static LList makeList(Object[] vals,
 int offset,
 int length)

makeList

public static LList makeList(Object[] vals,
 int offset)

consume

public void consume(Consumer out)

Specified by:

consume in interface Consumable

Overrides:

consume in class AbstractSequence<Object>

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readResolve

public Object readResolve()
                   throws ObjectStreamException

Throws:

ObjectStreamException

list1

public static Pair list1(Object arg1)

list2

public static Pair list2(Object arg1,
 Object arg2)

list3

public static Pair list3(Object arg1,
 Object arg2,
 Object arg3)

list4

public static Pair list4(Object arg1,
 Object arg2,
 Object arg3,
 Object arg4)

chain1

public static Pair chain1(Pair old,
 Object arg1)

Utility function used by compiler when inlining `list'.

chain4

public static Pair chain4(Pair old,
 Object arg1,
 Object arg2,
 Object arg3,
 Object arg4)

Utility function used by compiler when inlining `list'.

reverseInPlace

public static LList reverseInPlace(Object list)

Reverse a list in place, by modifying the cdr fields.

consX

public static Object consX(Object[] args)

SRFI-1's cons* and Common Lisp's list* function.

toString

public String toString()

Overrides:

toString in class AbstractSequence<Object>

checkNonList

public static Object checkNonList(Object rest)

Helper to protect against pathological LLists (neithr Pair nor Empty).