Class Pair

java.lang.Object

gnu.lists.AbstractSequence<Object>

gnu.lists.ExtSequence<Object>

gnu.lists.LList

gnu.lists.Pair

All Implemented Interfaces:

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

Direct Known Subclasses:

ImmutablePair, Translator.FormStack

public class Pair
extends LList
implements Externalizable

A "pair" object, as used in Lisp-like languages. When used to implement a list, the 'car' field contains an element's value, and the 'cdr' field points to either the next Pair or LList.Empty (which represents the end of the list). (The names "car" and "cdr" [pronounced "coulder"] are historical; better names might be "value" and "next".) While a Pair is normally usued to implement a linked list, sometimes the 'cdr' field points to some other non-list object; this is traditionally callled a "dotted list".

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected Object	car
protected Object	cdr
static final Pair	incompleteListMarker	A special pair used to indicate incomplete input.

Fields inherited from class LList

Empty

Fields inherited from class AbstractSequence

noInts

Fields inherited from interface 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
Pair()
Pair(Object carval, Object cdrval)

Method Summary

Modifier and Type	Method	Description
static int	compareTo(Pair pair1, Pair pair2)
int	compareTo(Object obj)
static boolean	equals(Pair pair1, Pair pair2)
boolean	equals(Object obj)
Object	get(int index)	See java.util.List.
Object	getCar()
Object	getCdr()
Object	getPosNext(int ipos)	Get the element following the specified position.
Object	getPosPrevious(int ipos)	Get the element before the specified position.
boolean	hasNext(int ipos)
boolean	isEmpty()	True is this sequence contains no elements.
Pair	lastPair()
int	length()
static Pair	make(Object car, Object cdr)
int	nextPos(int ipos)	Return the next position following the argument.
void	readExternal(ObjectInput in)
Object	readResolve()	Needed to override readResolve in LList.
void	setCar(Object car)
void	setCarBackdoor(Object car)	May go away soon.
void	setCdr(Object cdr)
void	setCdrBackdoor(Object cdr)
int	size()	See java.util.List.
Object[]	toArray()
Object[]	toArray(Object[] arr)
void	writeExternal(ObjectOutput out)

Methods inherited from class LList

boundedHash, chain1, chain4, checkNonList, consume, consX, createPos, createRelativePos, getIterator, hashCode, length, list1, list2, list3, list4, listLength, makeList, makeList, makeList, reverseInPlace, setPosNext, setPosPrevious, toString

Methods inherited from class ExtSequence

copyPos, isAfterPos, nextIndex, releasePos

Methods inherited from class 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, toString, unsupported, unsupportedException

Methods inherited from class Object

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

Methods inherited from interface Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface Iterable

forEach

Methods inherited from interface 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

Methods inherited from interface Sequence

elements, fill, getInt, set

Field Details

car

protected Object car

cdr

protected Object cdr

incompleteListMarker

public static final Pair incompleteListMarker

A special pair used to indicate incomplete input.

Constructor Details

Pair

public Pair(Object carval,
 Object cdrval)

Pair

public Pair()

Method Details

getCar

public Object getCar()

getCdr

public Object getCdr()

setCar

public void setCar(Object car)

setCdr

public void setCdr(Object cdr)

setCarBackdoor

public void setCarBackdoor(Object car)

May go away soon.

setCdrBackdoor

public void setCdrBackdoor(Object cdr)

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 LList

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 LList

length

public int length()

hasNext

public boolean hasNext(int ipos)

Overrides:

hasNext in class LList

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 LList

getPosNext

public Object getPosNext(int ipos)

Description copied from class: AbstractSequence

Get the element following the specified position.

Overrides:

getPosNext in class LList

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 LList

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.

lastPair

public Pair lastPair()

equals

public static boolean equals(Pair pair1,
 Pair pair2)

compareTo

public static int compareTo(Pair pair1,
 Pair pair2)

compareTo

public int compareTo(Object obj)

Specified by:

compareTo in interface Comparable

Overrides:

compareTo in class LList

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 LList

equals

public boolean equals(Object obj)

Specified by:

equals in interface Collection<Object>

Specified by:

equals in interface List<Object>

Overrides:

equals in class LList

make

public static Pair make(Object car,
 Object cdr)

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<Object>

Specified by:

toArray in interface List<Object>

Overrides:

toArray in class AbstractSequence<Object>

toArray

public Object[] toArray(Object[] arr)

Specified by:

toArray in interface Collection<Object>

Specified by:

toArray in interface List<Object>

Overrides:

toArray in class AbstractSequence<Object>

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class LList

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class LList

Throws:

IOException

ClassNotFoundException

readResolve

public Object readResolve()
                   throws ObjectStreamException

Needed to override readResolve in LList.

Overrides:

readResolve in class LList

Throws:

ObjectStreamException