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Diffstat (limited to 'utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/ImplyExp.java')
| -rw-r--r-- | utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/ImplyExp.java | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/ImplyExp.java b/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/ImplyExp.java new file mode 100644 index 00000000000..afe024dd1a8 --- /dev/null +++ b/utils/PDDLtoSANetTranslator/PDDLParser/src/pddl4j/exp/ImplyExp.java @@ -0,0 +1,367 @@ +/* + * 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.LinkedHashSet; +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 is implemented by all implication expression of the PDDL langage. + * + * @author Damien Pellier + * @version 1.0 + */ +public class ImplyExp extends AbstractExp { + + /** + * The serial version id of the class. + */ + private static final long serialVersionUID = 1L; + + /** + * The head of the implication expression. + */ + protected Exp head; + + /** + * The body of the implication expression. + */ + protected Exp body; + + /** + * Creates a new empty implication expression with a specific head and body + * expressions. + * + * @param head the head the implication expression. The head of the imply + * expression must be a not null reference to an instance of + * <code>Exp</code>. + * @param body the body the implication expression. The body of the imply + * formula must be a not null reference to an instance of + * <code>Exp</code>. + */ + public ImplyExp(Exp head, Exp body) { + super(ExpID.IMPLY); + this.head = head; + this.body = body; + } + + /** + * Sets a new head to this implication expression. + * + * @param head the new head of this implication expression. The new head of + * the implication expression must be a not null reference to an + * instance of <code>Exp</code>. + * @throws NullPointerException if <code>head == null</code>. + */ + public final void setHead(Exp head) { + if (head == null) + throw new NullPointerException(); + this.head = head; + } + + /** + * Returns the head of the implication expression. + * + * @return the head of the implication expression. + */ + public final Exp getHead() { + return this.head; + } + + /** + * Sets a new body to this implication expression. + * + * @param body the new body of this implication expression. The new body of + * the implication expression 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.body = body; + } + + /** + * Returns the body of the implication expression. + * + * @return the body of the implication expression. + */ + public final Exp getBody() { + return this.body; + } + + /** + * Returns <code>true</code> if a exp occurs in this not + * expression. + * + * @param term the exp to be tested. + * @return <code>true</code> if a exp occurs in this not + * expression; <code>false</code> otherwise. + */ + public final boolean occurs(Term term) { + return this.head.occurs(term) || this.body.occurs(term); + } + + /** + * Substitutes all occurrences of the variables that occur in this + * expression and that are mapped in the substitution by its binding term. + * + * @param sigma the substitution. + * @return a substituted copy of this expression + * @throws NullPointerException if <code>sigma == null</code>. + */ + public final ImplyExp apply(Substitution sigma) { + if (sigma == null) + throw new NullPointerException(); + return new ImplyExp(this.head.apply(sigma), this.body.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 ImplyExp 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 || bound == null</code>. + * @see pddl4j.exp.Exp#standardize(Map) + */ + public ImplyExp standardize(Map<String, String> images) { + if (images == null) + throw new NullPointerException(); + return new ImplyExp(this.head.standardize(images), + this.body.standardize(images)); + } + + /** + * 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.head.isGround() && this.body.isGround(); + } + + /** + * Returns <code>true</code> if this implication expression is equal to an + * other object, i.e., if the object is a not null reference to an instance + * of the class <code>ImplyExp</code> and both implication expressions + * have the same head and body expressions. + * + * @param obj The reference object with which to compare. + * @return <code>true</code> if this implication expression is equal to an + * other object; <code>false</code> otherwise. + */ + public boolean equals(Object obj) { + if (obj != null && obj instanceof ImplyExp) { + ImplyExp other = (ImplyExp) obj; + return this.getExpID().equals(other.getExpID()) + && this.head.equals(other.head) + && this.body.equals(other.body); + } + return false; + } + + /** + * Returns a hash code value for the implication expression. 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 implication expression. + */ + public int hashCode() { + return this.getExpID().hashCode() + this.head.hashCode() + + this.body.hashCode(); + } + + /** + * Creates and returns a copy of this expression. + * + * @return a clone of this expression instance. + * @see pddl4j.exp.Exp#clone() + */ + public ImplyExp clone() { + ImplyExp other = (ImplyExp) super.clone(); + other.head = this.head.clone(); + other.body = this.body.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() { + Exp exp = null; + if (this.head.getExpID().equals(ExpID.EXIST)) { + ExistsExp exists = (ExistsExp) this.head; + ForallExp forall = new ForallExp(); + for (Variable var : exists) { + forall.add(var.clone()); + } + ImplyExp imply = new ImplyExp(exists.getExp(), this.body); + forall.setExp(imply.moveQuantifierOutward()); + exp = forall.moveQuantifierOutward(); + } else if (this.head.getExpID().equals(ExpID.FORALL)) { + ForallExp forall = (ForallExp) this.head; + ExistsExp exists = new ExistsExp(); + for (Variable var : forall) { + exists.add(var.clone()); + } + ImplyExp imply = new ImplyExp(forall.getExp(), this.body); + exists.setExp(imply.moveQuantifierOutward()); + exp = exists.moveQuantifierOutward(); + } else if (this.body.getExpID().equals(ExpID.EXIST)) { + ExistsExp exists = (ExistsExp) this.body; + ExistsExp tmp = new ExistsExp(); + for (Variable var : exists) { + tmp.add(var.clone()); + } + ImplyExp imply = new ImplyExp(this.head, exists.getExp()); + tmp.setExp(imply.moveQuantifierOutward()); + exp = tmp.moveQuantifierOutward(); + } else if (this.body.getExpID().equals(ExpID.FORALL)) { + ForallExp forall = (ForallExp) this.body; + ForallExp tmp = new ForallExp(); + for (Variable var : forall) { + tmp.add(var.clone()); + } + ImplyExp imply = new ImplyExp(this.head, forall.getExp()); + tmp.setExp(imply.moveQuantifierOutward()); + exp = tmp.moveQuantifierOutward(); + } else { + exp = this.clone(); + } + return exp; + } + + /** + * Return the disjunctive normal form of this expression. + * + * @return the disjunctive normal form of this expression. + * @see pddl4j.exp.Exp#toDisjunctiveNormalForm() + */ + public OrExp toDisjunctiveNormalForm() { + return this.toNegativeNormalForm().toDisjunctiveNormalForm(); + } + + /** + * 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() { + return this.toNegativeNormalForm().toConjunctiveNormalForm(); + } + + /** + * 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 OrExp toNegativeNormalForm() { + OrExp nnf = new OrExp(); + nnf.add(new NotExp(this.head)); + nnf.add(this.body); + return nnf.toNegativeNormalForm(); + } + + /** + * Returns the set of free variables of this expression. + * + * @return the set of free variables of this expression. + */ + public Set<Variable> getFreeVariables() { + Set<Variable> vars = new LinkedHashSet<Variable>(); + vars.addAll(this.head.getFreeVariables()); + vars.addAll(this.body.getFreeVariables()); + return vars; + } + + /** + * Returns a string representation of the implication expression. + * + * @return a string representation of the implication expression. + */ + public String toString() { + StringBuffer str = new StringBuffer(); + str.append("(imply "); + str.append(this.head.toString()); + str.append(" "); + str.append(this.body.toString()); + str.append(")"); + return str.toString(); + } + + /** + * Returns a typed string representation of the implication expression. + * + * @return a typed string representation of the implication expression. + */ + public String toTypedString() { + StringBuffer str = new StringBuffer(); + str.append("(imply "); + str.append(this.head.toTypedString()); + str.append(" "); + str.append(this.body.toTypedString()); + str.append(")"); + return str.toString(); + } + +} |