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/*
* Copyright Dept. of Mathematics & Computer Science Univ. Paris-Descartes
*
* This software is governed by the CeCILL license under French law and
* abiding by the rules of distribution of free software. You can use,
* modify and/ or redistribute the software under the terms of the CeCILL
* license as circulated by CEA, CNRS and INRIA at the following URL
* "http://www.cecill.info".
*
* As a counterpart to the access to the source code and rights to copy,
* modify and redistribute granted by the license, users are provided only
* with a limited warranty and the software's author, the holder of the
* economic rights, and the successive licensors have only limited
* liability.
*
* In this respect, the user's attention is drawn to the risks associated
* with loading, using, modifying and/or developing or reproducing the
* software by the user in light of its specific status of free software,
* that may mean that it is complicated to manipulate, and that also
* therefore means that it is reserved for developers and experienced
* professionals having in-depth computer knowledge. Users are therefore
* encouraged to load and test the software's suitability as regards their
* requirements in conditions enabling the security of their systems and/or
* data to be ensured and, more generally, to use and operate it in the
* same conditions as regards security.
*
* The fact that you are presently reading this means that you have had
* knowledge of the CeCILL license and that you accept its terms.
*/
package pddl4j.exp;
import java.util.LinkedHashMap;
import java.util.Map;
import pddl4j.exp.term.Variable;
/**
* This class implements an existential expression of the PDDL language.
*
* @author Damien Pellier
* @version 1.0
*/
public final class ExistsExp extends QuantifiedExp {
/**
* The serial version id of the class.
*/
private static final long serialVersionUID = 509423923623946119L;
/**
* Creates a new existential expression with a specific list of bound
* variables and quantified expression.
*
* @param exp the quantified expression.
*/
public ExistsExp(Exp exp) {
super(ExpID.EXIST, exp);
}
/**
* Creates a new existential expression with a specific list of bound
* variables and quantified expression.
*/
public ExistsExp() {
super(ExpID.EXIST);
}
/**
* Standardizes all occurrences of the variables that occur in this
* expression. Remember that free variables are existentially quantified.
*
* @return a standardized copy of this expression.
*/
public ExistsExp standardize() {
return this.standardize(new LinkedHashMap<String,String>());
}
/**
* Standardizes all occurrences of the variables that occur in this
* expression. The map argument is used to store the variable already
* standardized. The bound argument is used to store the bound variables.
* Remember that free variables are existentially quantified.
*
* @param images the object that maps old variable images to the standardize
* image.
* @return a standardized copy of this expression.
* @throws NullPointerException if <code>images == null || bound == null</code>.
* @see pddl4j.exp.Exp#standardize(Map)
*/
public ExistsExp standardize(Map<String, String> images) {
return (ExistsExp) super.standardize(images);
}
/**
* Creates and returns a copy of this expression.
*
* @return a clone of this expression instance.
* @see pddl4j.exp.Exp#clone()
*/
public ExistsExp clone() {
return (ExistsExp) super.clone();
}
/**
* Return the disjunctive normal form of this expression. Note, the
* expression returned is a copy.
*
* @return the disjunctive normal form of this expression.
* @see pddl4j.exp.Exp#toDisjunctiveNormalForm()
*/
public ExistsExp toDisjunctiveNormalForm() {
ExistsExp dnf = this.clone();
dnf.exp = this.exp.toDisjunctiveNormalForm();
return dnf;
}
/**
* Returns the conjunctive normal form of this expression. Note, the
* expression returned is a copy.
*
* @return the conjunctive normal form of this expression.
* @see pddl4j.exp.Exp#toConjunctiveNormalForm()
*/
public ExistsExp toConjunctiveNormalForm() {
ExistsExp cnf = this.clone();
cnf.exp = this.exp.toConjunctiveNormalForm();
return cnf;
}
/**
* Returns the negative normal form of this expression. Note, the expression
* returned is a copy.
*
* @return the negative normal form of this expression.
* @see pddl4j.exp.Exp#toNegativeNormalForm()
*/
public ExistsExp toNegativeNormalForm() {
ExistsExp nnf = this.clone();
nnf.exp = this.exp.toNegativeNormalForm();
return nnf;
}
/**
* Returns a copy of this expression such that the quantifiers appear first.
*
* @return a copy of this expression such that the quantifiers appear first.
* @see pddl4j.exp.Exp#moveQuantifierOutward()
*/
public Exp moveQuantifierOutward() {
ExistsExp exists = this.clone();
exists.exp = this.exp.moveQuantifierOutward();
if (exists.exp.getExpID().equals(ExpID.FORALL)) {
ForallExp forall = (ForallExp) exists.exp;
exists.setExp(forall.exp);
forall.setExp(exists);
return forall;
} else if (exists.exp.getExpID().equals(ExpID.EXIST)) {
ExistsExp other = (ExistsExp) exists.exp;
for (Variable var : other) {
exists.add(var);
}
exists.setExp(other.exp);
return exists;
} else if (exists.exp.getExpID().equals(ExpID.WHEN)) {
WhenExp when = (WhenExp) exists.exp;
exists.setExp(when.getCondition());
when.setCondition(exists);
return when;
}
return exists;
}
}
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