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Diffstat (limited to 'utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/AndExp.java')
| -rw-r--r-- | utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/AndExp.java | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/AndExp.java b/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/AndExp.java new file mode 100644 index 00000000000..5956fdfebe9 --- /dev/null +++ b/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/AndExp.java @@ -0,0 +1,314 @@ +/* + * 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.HashMap; +import java.util.Iterator; +import java.util.Map; + +import pddl4j.exp.term.Substitution; +import pddl4j.exp.term.Variable; + +/** + * This abstract generic class is implemented by all conjunctive PDDL expression. + * + * @author Damien Pellier + * @version 1.0 + */ +public class AndExp extends ListExp { + + /** + * The serial version if of the class. + */ + private static final long serialVersionUID = -61659117952471061L; + + /** + * Creates a new empty conjunctive expression. + */ + public AndExp() { + super(ExpID.AND); + } + + /** + * Creates a new list expression with a specific id and expressions. + * + * @param exps an expressions list. + */ + public AndExp(Exp... exps) { + super(ExpID.AND, exps); + } + + /** + * Substitutes all occurrences of the variables that occur in this + * expression and that are mapped in the substitution by its binding + * expression. + * + * @param sigma the substitution. + * @return @return a substituted copy of this expression. + * @throws NullPointerException if <code>sigma == null</code>. + */ + public AndExp apply(Substitution sigma) { + return (AndExp) super.apply(sigma); + } + + /** + * 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. + * @see pddl4j.exp.Exp#standardize() + */ + public AndExp standardize() { + return this.standardize(new HashMap<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 AndExp standardize(Map<String, String> images) { + return (AndExp) super.standardize(images); + } + + /** + * Creates and returns a copy of this expression. + * + * @return a clone of this expression instance. + * @see pddl4j.exp.Exp#clone() + */ + public AndExp clone() { + return (AndExp) super.clone(); + } + + /** + * Returns the prenex normal form of this expression. Note, the expression + * returned is a copy. + * + * @return the prenex normal form of this expression. + */ + public Exp toPrenexNormaForm() { + return this.standardize().moveQuantifierOutward(); + } + + /** + * 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() { + Exp qexp = null; + AndExp and = new AndExp(); + Iterator<Exp> i = this.iterator(); + while (i.hasNext()) { + Exp exp = i.next(); + if (exp.getExpID().equals(ExpID.FORALL)) { + ForallExp forall = (ForallExp) exp; + if (!forall.exp.getExpID().equals(ExpID.WHEN)) { + ForallExp tmp = new ForallExp(); + for (Variable var : forall) { + tmp.add(var.clone()); + } + and.add(forall.getExp()); + while (i.hasNext()) { + and.add(i.next()); + } + tmp.setExp(and.moveQuantifierOutward()); + qexp = tmp; + } else { + and.add(exp.moveQuantifierOutward()); + } + } + else if (exp.getExpID().equals(ExpID.EXIST)) { + ExistsExp exists = (ExistsExp) exp; + if (!exists.exp.getExpID().equals(ExpID.WHEN)) { + ExistsExp tmp = new ExistsExp(); + for (Variable var : exists) { + tmp.add(var.clone()); + } + and.add(exists.getExp()); + while (i.hasNext()) { + and.add(i.next()); + } + tmp.setExp(and.moveQuantifierOutward()); + qexp = tmp; + } else { + and.add(exp.moveQuantifierOutward()); + } + } else { + and.add(exp); + } + } + return qexp == null ? and : qexp; + } + + /** + * Returns <code>true</code> if this and expression is conditional, i.e., + * if this expression contains a when expression. + * + * @return <code>true</code> if this and expression is conditional; + * <code>false</code> otherwise. + */ + private boolean isConditional() { + boolean isConditional = false; + Iterator<Exp> i = this.iterator(); + while (i.hasNext() && !isConditional) { + isConditional = i.next().getExpID().equals(ExpID.WHEN); + } + return isConditional; + } + + /** + * 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 AndExp toConjunctiveNormalForm() { + AndExp nnf = this.toNegativeNormalForm(); + AndExp cnf = new AndExp(); + if (nnf.isConditional()) { + for (Exp elt : nnf) { + if (!elt.getExpID().equals(ExpID.WHEN)) { + for (Exp cnfi : cnf) { + if (cnfi.getExpID().equals(ExpID.WHEN)) { + WhenExp when = (WhenExp) cnfi; + AndExp effect = new AndExp(); + effect.add(when.getEffect()); + effect.add(elt); + when.setEffect(effect); + when = when.normalize(); + } + } + } else { + WhenExp when = (WhenExp) elt; + cnf.add(when.normalize()); + } + } + } else { + for (Exp elt : nnf) { + elt = elt.toConjunctiveNormalForm(); + cnf.add(elt); + } + } + return cnf; + } + + /** + * 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 OrExp toDisjunctiveNormalForm() { + AndExp nnf = this.toNegativeNormalForm(); + OrExp dnf = new OrExp(); + dnf.add(new AndExp()); + for (Exp e : nnf) { + Exp ednf = e.toDisjunctiveNormalForm(); + if (ednf.getExpID().equals(ExpID.OR)) { + OrExp or = (OrExp) ednf; + OrExp newDnf = new OrExp(); + for (Exp oe : or) { + for (Exp and : dnf) { + AndExp other = (AndExp) and.clone(); + other.add(oe); + newDnf.add(other); + } + } + dnf = newDnf; + } else { + for (Exp ex : dnf) { + ((AndExp) ex).add(ednf); + } + } + } + return dnf; + } + + /** + * 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 AndExp toNegativeNormalForm() { + AndExp other = new AndExp(); + for (Exp exp : this) { + other.add(exp.toNegativeNormalForm()); + } + return other; + } + + /** + * Returns a string representation of the conjunctive expression. + * + * @return a string representation of the conjunctive expression. + */ + public String toString() { + StringBuffer str = new StringBuffer(); + str.append("(and"); + for (Exp elt : this.elements) { + str.append(" "); + str.append(elt.toString()); + } + str.append(")"); + return str.toString(); + } + + /** + * Returns a typed string representation of the conjunctive expression. + * + * @return a typed string representation of the conjunctive expression. + */ + public String toTypedString() { + StringBuffer str = new StringBuffer(); + str.append("(and"); + for (Exp elt : this.elements) { + str.append(" "); + str.append(elt.toTypedString()); + } + str.append(")"); + return str.toString(); + } + +} |