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Diffstat (limited to 'utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/DerivedPredicate.java')
-rw-r--r-- | utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/DerivedPredicate.java | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/DerivedPredicate.java b/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/DerivedPredicate.java new file mode 100644 index 00000000000..9ce7c31253c --- /dev/null +++ b/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/DerivedPredicate.java @@ -0,0 +1,323 @@ +/* + * 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 java.util.Set; + +import pddl4j.exp.term.Substitution; +import pddl4j.exp.term.Term; +import pddl4j.exp.term.Variable; + +/** + * This class implements a derived predicate of the PDDL language. + * + * @author Damien Pellier + * @version 1.0 + */ +public final class DerivedPredicate extends AbstractExp { + + /** + * The serial version id of the class. + */ + private static final long serialVersionUID = 523481664576398238L; + + /** + * The expression that defines the derived predicate. + */ + private ImplyExp exp; + + /** + * Creates a new derived predicate with a specific head and body. + * + * @param head the head of this derived predicate. + * @param body the body of this derived predicate + * @throws NullPointerException if <code>head == null || body == null</code>. + */ + public DerivedPredicate(AtomicFormula head, Exp body) { + super(ExpID.DERIVED_PREDICATE); + if (head == null || body == null) + throw new NullPointerException(); + this.exp = new ImplyExp(head, body); + } + + /** + * Sets a new head to this derived predicate. + * + * @param head the new head of this implication expression. The new head of + * the derived predicate must be a not null reference to an + * instance of <code>AtomicFormula</code>. + * @throws NullPointerException if <code>head == null</code>. + */ + public final void setHead(AtomicFormula head) { + if (head == null) + throw new NullPointerException(); + this.exp.setHead(head); + } + + /** + * Returns the head of the derived predicate. + * + * @return the head of the derived predicate. + */ + public final AtomicFormula getHead() { + return (AtomicFormula) this.exp.getHead(); + } + + /** + * Sets a new body to this derived predicate. + * + * @param body the new body of this derived predicate. The new body of + * the derived predicate must be a not null reference to an + * instance of <code>Exp</code>. + * @throws NullPointerException if <code>body == null</code>. + */ + public final void setBody(Exp body) { + if (body == null) + throw new NullPointerException(); + this.setBody(body); + } + + /** + * Returns the body of the derived predicate. + * + * @return the body of the derived predicate. + */ + public final Exp getBody() { + return this.exp.getBody(); + } + + /** + * Returns <code>true</code> if a expression occurs in this derived predicate. + * + * @param term the expression to be tested. + * @return <code>true</code> if a expression occurs in this derived predicate; + * <code>false</code> otherwise. + */ + public final boolean occurs(Term term) { + return this.exp.occurs(term); + } + + /** + * 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 a substituted copy of this expression. + * @throws NullPointerException if <code>sigma == null</code>. + */ + public final Exp apply(Substitution sigma) { + if (sigma == null) + throw new NullPointerException(); + DerivedPredicate other = this.clone(); + other.exp = this.exp.apply(sigma); + return other; + } + + /** + * 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 DerivedPredicate 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. 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</code>. + * @see pddl4j.exp.Exp#standardize(Map) + */ + public DerivedPredicate standardize(Map<String, String> images) { + if (images == null) + throw new NullPointerException(); + DerivedPredicate other = this.clone(); + other.exp = this.exp.standardize(images); + return other; + } + + /** + * Returns <code>true</code> if the expression is ground. + * + * @return <code>true</code> if the expression is ground; + * <code>false</code>otherwise. + * @see pddl4j.exp.Exp#isGround() + */ + public final boolean isGround() { + return this.exp.isGround(); + } + + + /** + * Returns <code>true</code> if this derived predicate is equal to an + * other object, i.e., if the object is a not null reference to an instance + * of the class <code>DerivedPredicate</code> and both derived predicates + * have the same parameters and expression. + * + * @param obj - the reference object with which to compare. + * @return <code>true</code> if this derived predicate is equal to an + * other object; <code>false</code> otherwise. + */ + public boolean equals(Object obj) { + if (obj != null && obj instanceof DerivedPredicate) { + DerivedPredicate other = (DerivedPredicate) obj; + return this.exp.equals(other.exp); + } + return false; + } + + /** + * Returns a hash code value for the derived predicate. This method is + * supported for the benefit of hash tables such as those provided by + * <code>java.util.Hashtable</code>. + * + * @return a hash code value for the derived predicate. + */ + public int hashCode() { + return this.getExpID().hashCode() + this.exp.hashCode(); + } + + /** + * Creates and returns a copy of this expression. + * + * @return a clone of this expression instance. + * @see pddl4j.exp.Exp#clone() + */ + public DerivedPredicate clone() { + DerivedPredicate other = (DerivedPredicate) super.clone(); + other.exp = exp.clone(); + return other; + } + + /** + * 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() { + DerivedPredicate other = this.clone(); + other.exp.body = this.exp.body.moveQuantifierOutward(); + return other; + } + + /** + * 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 DerivedPredicate toDisjunctiveNormalForm() { + DerivedPredicate dnf = this.clone(); + dnf.exp.body = this.exp.body.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 DerivedPredicate toConjunctiveNormalForm() { + DerivedPredicate cnf = this.clone(); + cnf.exp.body = this.exp.body.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 DerivedPredicate toNegativeNormalForm() { + DerivedPredicate nnf = this.clone(); + nnf.exp.body = this.exp.body.toNegativeNormalForm(); + return nnf; + } + + /** + * Returns the set of free variables of this expression. + * + * @return the set of free variables of this expression. + */ + public Set<Variable> getFreeVariables() { + return this.exp.getFreeVariables(); + } + + /** + * Returns a string representation of the derived predicate. + * + * @return a string representation of the derived predicate. + */ + public String toString() { + StringBuffer str = new StringBuffer(); + str.append("(:derived "); + str.append("("); + str.append(this.exp.toString()); + str.append(")"); + str.append(" "); + str.append(this.exp.toString()); + str.append(")"); + return str.toString(); + } + + /** + * Returns a string representation of the derived predicate. + * + * @return a string representation of the derived predicate. + */ + public String toTypedString() { + StringBuffer str = new StringBuffer(); + str.append("(:derived "); + str.append("("); + str.append(this.exp.toTypedString()); + str.append(")"); + str.append(" "); + str.append(this.exp.toTypedString()); + str.append(")"); + return str.toString(); + } + +} |