gnu.mapping

Class Values<E>

java.lang.Object

gnu.lists.AbstractSequence<E>

gnu.mapping.Values<E>

All Implemented Interfaces:

Consumable, java.io.Externalizable, java.io.Serializable

Direct Known Subclasses:

Values.FromArray, Values.FromList, Values.FromTreeList, Values.Values2

public abstract class Values<E>
extends AbstractSequence<E>
implements Consumable, java.io.Externalizable

Encapsulate multiple values in a single object. In Scheme and Lisp mainly used to return multiple values from a function. In XQuery used to represent a non-singleton sequence.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Values.FromArray<E> An implementation of Values that stores the values in an array.
static class	Values.FromList<E> An implementation of Values that uses a java.util.List.
static class	Values.FromTreeList An implementation of Values that uses a TreeList.
static class	Values.Values2<E,V1 extends E,V2 extends E> A specialization of Values for exactly 2 values.

Field Summary

Fields

Modifier and Type	Field and Description
static Values	empty
static java.lang.Object[]	noArgs

Fields inherited from class gnu.lists.AbstractSequence

noInts

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Values()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	call_with(Procedure proc) Apply a Procedure with these values as the arguments.
java.lang.Object	canonicalize() If a simple value, return that value.
static void	checkFinalPos(java.lang.Object values, int pos)
static int	countValues(java.lang.Object value)
static java.lang.Object	getFromPos(java.lang.Object values, int pos)
static java.lang.Object	getFromPosFinal(java.lang.Object values, int pos)
java.lang.Object[]	getValues() Get the values encapsulated.
static int	incrPos(java.lang.Object values, int pos)
static Values	make()
static <E> java.lang.Object	make(E[] vals) Create a value for each element of an array.
static <E> java.lang.Object	make(java.util.List<E> seq) Create a value for each element of a list.
static java.lang.Object	make(TreeList list, int startPosition, int endPosition) Extract a value (single or Values) from a sub-range of a TreeList.
static <E> Values<E>	makeFromArray(E... vals)
protected int	nextIndex(int ipos) Get the offset from the beginning corresponding to a position cookie.
static int	nextIndex(java.lang.Object values, int curIndex) Helper method called by compiled code.
static java.lang.Object	nextValue(java.lang.Object values, int curIndex) Helper method called by compiled code.
void	print(Consumer out)
java.lang.Object	readResolve()
static java.lang.Object	values(java.lang.Object... vals)
static <E,V1 extends E,V2 extends E> Values.Values2<E,V1,V2>	values2(V1 val1, V2 val2)
void	writeExternal(java.io.ObjectOutput out)
static void	writeValues(java.lang.Object value, Consumer out)

Methods inherited from class gnu.lists.AbstractSequence

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface gnu.lists.Consumable

consume

Methods inherited from interface java.io.Externalizable

readExternal

Field Detail

noArgs

public static final java.lang.Object[] noArgs

empty

public static final Values empty

Constructor Detail

Values

protected Values()

Method Detail

getValues

public java.lang.Object[] getValues()

Get the values encapsulated.

values

public static java.lang.Object values(java.lang.Object... vals)

values2

public static <E,V1 extends E,V2 extends E> Values.Values2<E,V1,V2> values2(V1 val1,
                                                                            V2 val2)

make

public static Values make()

make

public static <E> java.lang.Object make(E[] vals)

Create a value for each element of an array.

Parameters:

vals - values to use. The array should be immutable, as may be re-used for the result.

makeFromArray

public static <E> Values<E> makeFromArray(E... vals)

make

public static <E> java.lang.Object make(java.util.List<E> seq)

Create a value for each element of a list.

Parameters:

seq - values to use. The list should be immutable, as may be re-used for the result.

make

public static java.lang.Object make(TreeList list,
                                    int startPosition,
                                    int endPosition)

Extract a value (single or Values) from a sub-range of a TreeList.

Parameters:

list - the TreeList to copy

startPosition - start of range, as a raw index in data

endPosition - end of range, as a raw index in data

canonicalize

public java.lang.Object canonicalize()

If a simple value, return that value. Also, if no values, return empty.

call_with

public java.lang.Object call_with(Procedure proc)
                           throws java.lang.Throwable

Apply a Procedure with these values as the arguments.

Throws:

java.lang.Throwable

print

public void print(Consumer out)

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Throws:

java.io.IOException

readResolve

public java.lang.Object readResolve()
                             throws java.io.ObjectStreamException

Throws:

java.io.ObjectStreamException

incrPos

public static int incrPos(java.lang.Object values,
                          int pos)

getFromPos

public static java.lang.Object getFromPos(java.lang.Object values,
                                          int pos)

getFromPosFinal

public static java.lang.Object getFromPosFinal(java.lang.Object values,
                                               int pos)

checkFinalPos

public static void checkFinalPos(java.lang.Object values,
                                 int pos)

nextIndex

public static int nextIndex(java.lang.Object values,
                            int curIndex)

Helper method called by compiled code. The compiled code iterates through zero or more values. Return the index of the next value, or -1 if currently at eof. A non-Values object is treated as a singleton value, so in that case there is no next value.

nextValue

public static java.lang.Object nextValue(java.lang.Object values,
                                         int curIndex)

Helper method called by compiled code. The compiled code iterates through zero or more values. Extract the object referenced by the curIndex. A non-Values object is treated as a singleton value.

nextIndex

protected int nextIndex(int ipos)

Description copied from class: AbstractSequence

Get the offset from the beginning corresponding to a position cookie.

Overrides:

nextIndex in class AbstractSequence<E>

writeValues

public static void writeValues(java.lang.Object value,
                               Consumer out)

countValues

public static int countValues(java.lang.Object value)