org.projog.core.predicate.builtin.io

Class Open

java.lang.Object

org.projog.core.predicate.AbstractSingleResultPredicate

org.projog.core.predicate.builtin.io.Open

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory

public final class Open
extends AbstractSingleResultPredicate

open(X,Y,Z) - opens a file.

X is an atom representing the name of the file to open. Y is an atom that should have either the value read to open the file for reading from or write to open the file for writing to. Z is instantiated by open to a special term that must be referred to in subsequent commands in order to access the stream.

Constructor Summary

Constructors

Constructor and Description
Open()

Method Summary

Modifier and Type	Method and Description
protected boolean	evaluate(Term fileNameAtom, Term operationAtom, Term variableToAssignTo)

Methods inherited from class org.projog.core.predicate.AbstractSingleResultPredicate

evaluate, evaluate, evaluate, evaluate, evaluate, getArithmeticOperators, getFileHandles, getKnowledgeBase, getOperands, getPredicate, getPredicates, getProjogListeners, getSpyPoints, getTermFormatter, init, isRetryable, setKnowledgeBase

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.projog.core.predicate.PredicateFactory

isAlwaysCutOnBacktrack

Constructor Detail

Open

public Open()

Method Detail

evaluate

protected boolean evaluate(Term fileNameAtom,
                           Term operationAtom,
                           Term variableToAssignTo)

Overrides:

evaluate in class AbstractSingleResultPredicate