/**
* ***************************************************************
* JADE - Java Agent DEvelopment Framework is a framework to develop
* multi-agent systems in compliance with the FIPA specifications.
* Copyright (C) 2000 CSELT S.p.A.
*
* GNU Lesser General Public License
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation,
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
* **************************************************************
*/
package jade.content.abs;
import jade.content.Predicate;
/**
* An abstract descriptor that can hold a predicate expression.
* @author Paola Turci, Federico Bergenti - Universita` di Parma
*/
public class AbsPredicate extends AbsPrimitiveSlotsHolder implements AbsContentElement, Predicate {
private boolean isAContentExpression = false;
private boolean isMeta = false;
/**
* Construct an Abstract descriptor to hold a predicate of
* the proper type (e.g. FATHER_OF, WORKS_FOR...).
* @param typeName The name of the type of the predicate held by
* this abstract descriptor.
*/
public AbsPredicate(String typeName) {
super(typeName);
}
/**
* Sets an attribute of the predicate held by this
* abstract descriptor.
* @param name The name of the attribute to be set.
* @param value The new value of the attribute.
*/
public void set(String name, AbsObject value) {
super.set(name, value);
}
/**
* Gets the value (casted as an AbsTerm) of an attribute of
* the predicate held by this abstract descriptor.
* This method is here mainly for backward compatibility.
* @param name The name of the attribute.
* @return value The value of the attribute.
*/
public AbsTerm getAbsTerm(String name) {
return (AbsTerm) getAbsObject(name);
}
// Easy way to access the Java class representing AbsPredicate.
// Useful in MIDP where XXX.class is not available
private static Class absPredicateClass = null;
public static Class getJavaClass() {
if (absPredicateClass == null) {
try {
absPredicateClass = Class.forName("jade.content.abs.AbsPredicate");
}
catch (Exception e) {
// Should never happen
e.printStackTrace();
}
}
return absPredicateClass;
}
/**
* @see AbsContentElement.isAContentExpression
*/
public boolean isAContentExpression() {
return isAContentExpression;
}
/**
* @see AbsContentElement.setIsAContentExpression(boolean flag)
*/
public void setIsAContentExpression(boolean flag) {
isAContentExpression = flag;
}
/** Return true if this object represents a meta formula (symbol ??x) rather than a concrete formula.
* This method is currently used only by the semantics framework.
* @return true if this object represents a meta formula
* @since JADE3.4
**/
public final boolean isMetaFormula() {return isMeta;}
/** Sets the value of isMetaFormula, where the default is false.
* This method is currently used only by the semantics framework.
* @since JADE3.4
**/
public final void setIsMetaFormula(boolean isMeta) { this.isMeta = isMeta;}
public int getAbsType() {
return ABS_PREDICATE;
}
}