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package jp.ac.kobe_u.cs.prolog.lang;
/**
* Instantiation error.<br>
* There will be an instantiation error
* when an argument of one of its components is a variable,
* and an instantiated argument or component is required.
*
* @author Mutsunori Banbara (banbara@kobe-u.ac.jp)
* @author Naoyuki Tamura (tamura@kobe-u.ac.jp)
* @version 1.0
*/
public class PInstantiationException extends BuiltinException {
/** A functor symbol of <code>instantiation/2</code>. */
public static final SymbolTerm INSTANTIATION_ERROR = SymbolTerm.makeSymbol("instantiation_error", 2);
/** Constructs a new <code>PInstantiationException</code>. */
public PInstantiationException(){}
/** Constructs a new <code>PInstantiationException</code>
* with the given arguments. */
public PInstantiationException(Operation _goal, int _argNo) {
this.goal = _goal;
this.argNo = _argNo;
}
/** Returns a term representation of this <code>PInstantiationException</code>:
* <code>instantiation_error(goal,argNo)</code>.
*/
public Term getMessageTerm() {
Term[] args = {new JavaObjectTerm(goal), new IntegerTerm(argNo)};
return new StructureTerm(INSTANTIATION_ERROR, args);
}
/** Returns a string representation of this <code>PInstantiationException</code>. */
public String toString() {
String s = "{INSTANTIATION ERROR: " + goal.toString();
if (argNo > 0)
s += " - arg " + argNo;
s += "}";
return s;
}
}
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