GetChar

java.lang.Object
- org.projog.core.predicate.AbstractSingleResultPredicate
- - org.projog.core.predicate.builtin.io.GetChar

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory
```
public final class GetChar
extends AbstractSingleResultPredicate
```
get_char(X) - reads the next character from the input stream.
The goal succeeds if X can be unified with next character read from the current input stream. Succeeds only once and the operation of moving to the next character is not undone on backtracking.

If there are no more characters to read from the current input stream (i.e. if the end of the stream has been reached) then an attempt is made to unify X with an atom with the value end_of_file.

Constructor Summary

Constructors
Constructor Description

GetChar()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected boolean`	`evaluate(Term argument)`
`private Atom`	`toAtom(int c)`
`private java.lang.String`	`toString(int c)`

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
- GetChar
```
public GetChar()
```

Method Detail

evaluate
```
protected boolean evaluate(Term argument)
```
Overrides:

evaluate in class AbstractSingleResultPredicate

toAtom
```
private Atom toAtom(int c)
```

toString

private java.lang.String toString(int c)