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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.cond;
import java.util.Map;
import java.util.LinkedHashMap;
import pddl4j.exp.Exp;
import pddl4j.exp.fexp.Number;
import pddl4j.exp.term.Substitution;
/**
* This class implements a "hold-after" conditional expression of the PDDL
* language.
*
* @author Damien Pellier
* @version 1.0
*/
public class HoldAfterExp extends UnaryCondExp {
/**
* The serial version id of the class.
*/
private static final long serialVersionUID = -5875541478330858782L;
/**
* The time stamp.
*/
private Number ts;
/**
* Creates a new conditional "hold-after" expression with a specific
* expression.
*
* @param arg the expression. The expression must be a not null reference.
* @param ts the time stamp to this this "hold-after" conditional
* expression. The time stamp must be a not null reference.
*/
public HoldAfterExp(Exp arg, Number ts) {
super(Condition.HOLD_AFTER, arg);
this.ts = ts;
}
/**
* Sets a new time stamp to this this "hold-after" conditional expression.
*
* @param ts the new time stamp to this this "hold-after" conditional
* expression. The time stamp must be a not null reference.
*/
public final void setTimeStamp(Number ts) {
this.ts = ts;
}
/**
* Returns the time stamp to this this "hold-after" conditional expression.
*
* @return the time stamp to this this "hold-after" conditional expression.
*/
public final Number getTimeStamp() {
return this.ts;
}
/**
* 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 HoldAfterExp apply(Substitution sigma) {
return (HoldAfterExp) 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.
*/
public HoldAfterExp 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. a
* standardized copy of this expression. 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>.
*/
public HoldAfterExp standardize(Map<String, String> images) {
return (HoldAfterExp) super.standardize(images);
}
/**
* Returns <code>true</code> if this "hold-after" conditional expression
* is equal to an other object, i.e., if the object is a not null reference
* to an instance of the class <code>HoldAfterExp</code> and both
* "hold-after" conditional expressions have the same expression and time
* stamp.
*
* @param obj the object to compare.
* @return <code>true</code> if this "hold-after" conditional expression
* is equal to an other object; <code>false</code> otherwise.
*/
public boolean equals(Object obj) {
if (obj != null && obj instanceof HoldAfterExp) {
HoldAfterExp other = (HoldAfterExp) obj;
return super.equals(obj) && this.ts.equals(other.ts);
}
return false;
}
/**
* Returns the hash code value of this "hold-after" conditional expression.
*
* @return the hash code value of this "hold-after" conditional expression.
*/
public int hashCode() {
return super.hashCode() + this.ts.hashCode();
}
/**
* Creates and returns a copy of this expression.
*
* @return a clone of this expression instance.
* @see pddl4j.exp.Exp#clone()
*/
public HoldAfterExp clone() {
HoldAfterExp other = (HoldAfterExp) super.clone();
other.ts = this.ts.clone();
return other;
}
/**
* Returns a string representation of this "hold-after" conditional
* expression.
*
* @return a string representation of this "hold-after" conditional
* expression.
*/
public String toString() {
StringBuffer str = new StringBuffer();
str.append("(hold-after ");
str.append(this.ts.toString());
str.append(" ");
str.append(this.getArg().toString());
str.append(")");
return str.toString();
}
/**
* Returns a typed string representation of this "hold-after" conditional
* expression.
*
* @return a typed string representation of this "hold-after" conditional
* expression.
*/
public String toTypedString() {
StringBuffer str = new StringBuffer();
str.append("(hold-after ");
str.append(this.ts.toTypedString());
str.append(" ");
str.append(this.getArg().toTypedString());
str.append(")");
return str.toString();
}
}
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