Class Values<E>

java.lang.Object

gnu.lists.AbstractSequence<E>

gnu.mapping.Values<E>

All Implemented Interfaces:

Consumable, Externalizable, Serializable

Direct Known Subclasses:

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

public abstract class Values<E>
extends AbstractSequence<E>
implements Consumable, 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	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	Description
static final Values	empty
static final Object[]	noArgs

Fields inherited from class AbstractSequence

noInts

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Values()

Method Summary

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

Methods inherited from class 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 Object

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

Methods inherited from interface Consumable

consume

Methods inherited from interface Externalizable

readExternal

Field Details

noArgs

public static final Object[] noArgs

empty

public static final Values empty

Constructor Details

Values

protected Values()

Method Details

getValues

public Object[] getValues()

Get the values encapsulated.

values

public static Object values(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> 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> Object make(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 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 Object canonicalize()

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

call_with

public Object call_with(Procedure proc)
                 throws Throwable

Apply a Procedure with these values as the arguments.

Throws:

Throwable

print

public void print(Consumer out)

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readResolve

public Object readResolve()
                   throws ObjectStreamException

Throws:

ObjectStreamException

incrPos

public static int incrPos(Object values,
 int pos)

getFromPos

public static Object getFromPos(Object values,
 int pos)

getFromPosFinal

public static Object getFromPosFinal(Object values,
 int pos)

checkFinalPos

public static void checkFinalPos(Object values,
 int pos)

nextIndex

public static int nextIndex(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 Object nextValue(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(Object value,
 Consumer out)

countValues

public static int countValues(Object value)