se.sics.prologbeans
Class PBList
java.lang.Object
|
+--se.sics.prologbeans.Term
|
+--se.sics.prologbeans.PBCompound
|
+--se.sics.prologbeans.PBList
- Direct Known Subclasses:
- PBString
- public class PBList
- extends PBCompound
PBList
is the Java representation of Prolog lists.
Fields inherited from class se.sics.prologbeans.Term |
name |
Method Summary |
Term |
getArgument(int index)
Returns the first or second argument of this list node. |
int |
getArity()
Returns the number of arguments of this compound term or 0 if this
term is not a compound term. |
Term |
getEnd()
Returns the end of this list. |
int |
getLength()
Returns the length of this list. |
Term |
getTermAt(int index)
Returns the element at the specified index in this list. |
boolean |
isList()
Returns true if this term is a list and
false otherwise. |
java.lang.String |
toString()
Returns a string description of this term. |
Methods inherited from class se.sics.prologbeans.Term |
doubleValue, floatValue, getName, intValue, isCompound, isFloat, isInteger, isString, isVariable, longValue, stuffAtom |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
nextTerm
protected final Term nextTerm
isList
public boolean isList()
- Description copied from class:
Term
- Returns
true
if this term is a list and
false
otherwise.
- Overrides:
isList
in class Term
getArgument
public Term getArgument(int index)
- Returns the first or second argument of this list node. Only
non-empty lists have arguments. Note: the arguments are indexed
from 1 to 2.
Due to performance reasons this should be avoided if not 100%
necessary. Please use getTermAt(int index)
for
accessing the elements of lists.
- Overrides:
getArgument
in class PBCompound
- Parameters:
index
- the (one based) index of the argument- Returns:
- the argument as a Term
- Throws:
java.lang.IllegalStateException
- if this term is not compound- See Also:
getTermAt(int)
getArity
public int getArity()
- Description copied from class:
Term
- Returns the number of arguments of this compound term or 0 if this
term is not a compound term.
- Overrides:
getArity
in class PBCompound
getLength
public int getLength()
- Returns the length of this list.
getTermAt
public Term getTermAt(int index)
- Returns the element at the specified index in this list. Note:
the elements are indexed from 1 to length.
- Parameters:
index
- the (one based) index of the element in this list- Returns:
- the element as a Term
- See Also:
getLength()
getEnd
public Term getEnd()
- Returns the end of this list. For closed lists this element is
the empty list.
toString
public java.lang.String toString()
- Description copied from class:
Term
- Returns a string description of this term.
- Overrides:
toString
in class PBCompound